Soil Organic Nitrogen and Its Contribution to Crop Production
LI Sheng-xiu, WANG Zhao-hui, MIAO Yan-fang , LI Shi-qing
1、College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, P.R.China
2、School of Agriculture, Henan University of Science and Technology, Luoyang 471003, P.R.China
3、State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, P.R.China
摘要 Plant growth and crop production depend to a large extent on soil N supplying capacity (SNSC): The higher the SNSC, the higher the dependence of crops on soil and the lower the N fertilizer recovery. Of the SNSC, soil organic N (ON) played a key role in supplying N nutrient to crop production and still does in many subsistence and low-input farming systems. In this paper, soil ON contents, types, chemical components and its contribution to plant production are reviewed up to date in details, the characteristics of ON in dryland soils discussed together with its chemical components, and the mineralization and availability to plants of some important chemical components are emphasized at the last part for practical considerations.
Abstract Plant growth and crop production depend to a large extent on soil N supplying capacity (SNSC): The higher the SNSC, the higher the dependence of crops on soil and the lower the N fertilizer recovery. Of the SNSC, soil organic N (ON) played a key role in supplying N nutrient to crop production and still does in many subsistence and low-input farming systems. In this paper, soil ON contents, types, chemical components and its contribution to plant production are reviewed up to date in details, the characteristics of ON in dryland soils discussed together with its chemical components, and the mineralization and availability to plants of some important chemical components are emphasized at the last part for practical considerations.
LI Sheng-xiu, WANG Zhao-hui, MIAO Yan-fang , LI Shi-qing.
2014.
Soil Organic Nitrogen and Its Contribution to Crop Production. Journal of Integrative Agriculture, 13(10): 2061-2080.
Aldag R W. 1977. Relations between pseudo-amides Nand humic acid N released under different hydrolyticconditions. In: Soil Organic Matter Studies. Proceedings ofthe Braunschweig Symposium, IAEA, Vienna. pp. 293-299
Allen A L, Stevenson J F, Kurtz L T. 1973. Chemicaldistribution of residual fertilizer nitrogen in soil as revealedby nitrogen-15 studies Journal of Environmental Quality.2, 120-124.
Allison F E. 1956. Estimating the ability of soils to supplynitrogen. Journal of Agricultural and Food Chemistry,11, 46-48, 139
Amelung W. 2003. Nitrogen biomarkers and their fate in soil.Journal of Plant Nutrition and Soil Science, 166, 677-686
Anderson G. 1961. Estamation of purines and pyrimidines insoil humic acid. Soil Science, 91, 156-161
Anderson H A, Vaughan D. 1985. Soil nitrogen: its extraction,distribution and dynamics. In: Vaughan D, Malcolm R E.eds., Soil Organic Matter and Biological Activity. MartnusNijhoff/Dr W Junk Publishers, The Hague. pp. 290-319
Appuhn A, Joergensen R G, Raubuch M, Scheller E, WilkeB. 2004. The automated determination of glucosamine,galactosamine, muramic acid, and mannosamine in soiland root hydrolysates by HPLC. Journal of Plant Nutritionand Soil Science, 167, 17-21
Asami T, Hara M. 1971. On the fractionation of soil organicnitrogen after hydrolysis using hydrochloric acid. SoilScience and Plant Nutrition, 17, 222.
Benzing-Purdie L, Ripmeester J A, Preston C M. 1983.Elucidation of the nitrogen forms in mela-noidins andhumic acid by nitrogen-15 cross polarization-magicangle spinning nuclear magnetic resonance spectroscopyJournal of Agricultural and Food Chemistry, 31, 913-915
Bertin C, Yang X, Weston L A. 2003. The role of root exudatesand allelochemicals in the rhizosphere. Plant and Soil,67, 67-83
Brady N C. 1974. The Nature and Properties of Soils. 8th ed.Macmillan Publishing, New York. pp. 1-18
Bremner J M. 1949. Studies on soil organic matter 1. Chemicalnature of soil organic nitrogen. Journal of AgriculturalScience, 39, 183-193
Bremner J M. 1950. The amino-acid composition of the proteinmaterials in soil. Biochemistry Journal, 47, 538-542
Bremner J M. 1965. Organic nitrogen in soils. In: BartholomewW V, Clark F E, eds., Soil Nitrogen. Agronomy 10:American Society of Agronomy. Madison, Wisconsin.pp. 93-149
Bremner J M. 1967. Nitrogenous compounds. In: McLaren AD, Peterson G H, eds., Soil Biochemistry. Marcel Dekker,New York. pp. 19-66
Burns R C, Hardy R W F. 1975. Nitrogen Fixation in Bacteriaand Higher Plants. Springer Verlag, Berlin and New York.Campbell C A, Sohnitzer M, Lafond G P, Zentner R P, KnipfelJ E 1991. Thirty year crop rotation and managementpractices effects on soil and amino nitrogen. Soil ScienceSociety of America Journal, 55, 739-745
Carles J, Decau J. 1960. Variations in the amino acids of soilhydrolysates. Science Proceedings of the Royal DublinSociety (Series A), 1, 177-182
Chalk P M, Keeney D R. 1971. Nitrate and ammonium contentsof Wisconsin limestones. Nature, 229, 42.
Cohand K M, Edmeades D C. 1979. Distribution and partialcharacterization of acid hydrolysable organic nitrogen insix Alew Zealand soils. Soil Biology & Biochemistry, 11,127-132
Cooperative Research Group on Chinese Soil Taxonomy.2001. Chinese Soil Taxonomy. Science Press, Beijing andNew York. pp. 1-203
Cortez J, Schnitzer M. 1979. Nucleic acid and bases in soiland their association with organic and inorganic soilcompounds. Canadian Journal of Soil Science, 59, 277-286
Fahey J W, Zalcmann A T, Talalay P. 2001. The chemicaldiversity and distribution of glu cosinolates andisothiocyanates among plants. Phytochemistry, 56, 5-51
Fekete A, Malik A K, Kumar A, Schmitt-Kopplin P. 2010.Amines in the environment. Critical Reviews in AnalyticalChemistry, 40, 102-121
Ferguson W S, Sowden F J. 1966. A comparison of methods ofdetermining nitrogen fractions in soils. Canadian Journalof Soil Science, 46, 1-6
Fischer H, Eckhardt K U, Meyer A, Neumann G, Leinweber P,Fischer K, Kuzyakov Y. 2010. Rhizodeposition of maize:Short-term carbon budget and composition. Journal ofPlant Nutrition and Soil Science, 173, 67-79
Fleige H, Meyer B, Scholz H. 1971. Fraktionierung desBoden-Stickstoffs f?r N-Haushalts-Bilanzen. GöttingerBodenkunde Bereich, 18 1-37 (in German)
Fu H F, Li S X. 1992a. Soil nitrogen mineralization andsoil N-supplying capacities. I. Comparison of twoincubation methods for measuring dryland soil nitrogenmineralization. Acta Universitatis Agriculturalis Boreali-Occidentalis, 20(Suppl.), 48-52 (in Chinese)
Fu H F, Li S X. 1992b. Soil nitrogen mineralization and soilN-supplying capacities. IV. The organic N componentsand their mineralization. Acta Universitatis AgriculturalisBoreali-Occidentalis, 20(Suppl.), 63-67. (in Chinese)
Fujii K, Robayashi M, Takuhashi E. 1974. Amines in themixture of plant residue and sand incubated underaerobic and water-logged condition (part 5). Studies onthe Alternation of Soil Microflora and Their Metabolism.20, 101-102
Galloway J N, Cowling E B. 2002. Reactive nitrogen and theworld: 200 years of change. AMBIO, 31, 64-71Goh K M, Edmeades D C
1979. Distribution and partialcharacterization of acid hydrolysable organic nitrogen in six New Zealand soils. Soil Biology & Biochemistry, 11,127-132
Gong W, Yan X Y, Cai Z C, Wang J Y, Hu T X, Fu Y P, Ran H.2008. Effects of long-term fertilization on soil particulatecarbon and nitrogen in a wheat-maize cropping system.Chinese Journal of Applied Ecology, 19, 2375-2381 (inChinese)
Greenfield L G. 1972. The nature of the organic nitrogen ofsoils. Plant and Soil, 36, 191-198
Griffith S M, Sowden P J, Schnitzer M. 1976. The alkalinehydrolysis of acid-resistant soil and humic residues.Soil Biology & Biochemistry, 8, 529-531
Guo J R, Li G R. 1989. The state of N fertilizer research andits use development. Soil Fertilizer, 4, 28-33. (in Chinese)
Haynes R J. 2005. Labile organic matter fractions as centralcomponents of the quality of agricultural soils: Anoverview. Advances in Agronomy, 85, 221-268
Huang W, Chen A L, Wang W, Xie X L, Dong C L, Liu S L,Su Y T. 2012. Effect of long-term fertilization on activeorganic carbon and nitrogen in paddy soils. Journal ofAgro-Environment Science, 31, 1854-1861
Jokic A, Cutler J N, Anderson D W, Walley F L. 2004.Detection of heterocyclic N com pounds in whole soilsusing N-XANES spectroscopy. Canadian Journal of SoilScience, 84, 291-293
Jones D J, Shannon D, Junvee-Fortune T, Farrar J F. 2005.Plant capture of free amino acids is maximized underhigh soil amino acid concentrations. Soil Biology &Biochemistry, 37, 179-181
Kato T. 1974. On the water-soluble organic matter in paddysoils. Part 4. Behavior of free amino acids under thesubmerged condition. Journal of the Science of Soil andManure, 45, 459-462. (in Japanese)
Keeney D H, Bremner J M. 1964. Effect of cultivation onthe nitrogen distribution in soils. Soil Science Society ofAmerica Proceeding, 28, 653-656
Keeney D R. 1982. Nitrogen-availability indices. In: Page AL, ed., Methods of Soil Analysis. Part 2. American Societyof Agronomy, Madison, Wisconsin. pp. 65-688
Khan S U, Sowden F J. 1972. Distribution of nitrogen in theblack solonetzic and black chemozemic soils of Alberta.Canadian Journal of Soil Science, 51, 185-193
Khan S U. 1971. Nitrogen fractions in a grey wooded soil asinfluenced by long-term cropping systems and fertilizers.Canadian Journal of Soil Science, 51, 431-437
Kramer P J. 1983. Water Relations of Plants. Academic Press,New York. pp. 57-83
Kuzyakov Y, Siniakina S. 2001. A novel method for separatingroot derived organic com pounds from root respiration innon sterilized soils. Journal of Plant Nutrition and SoilScience, 164, 511-517
Ladd J N, Butler J H A. 1966. Comperison of some propetiesof soil humic acids and synthetic phenoic polymersincorporating amino derivatives. Australian Journal ofSoil Research, 4, 41-54
Landgraf D, Leinweber P, Makeschin F. 2006. Cold and hotwater extractable organic matter as indicators of litterdecomposition in forest soils. Journal of Plant Nutritionand Soil Science, 169, 76-82
Leinweber P, Jandl G, Eckhardt K U, Kruse J, Walley F L,Khan M J, Blyth R I R, Regier T. 2010. Nitrogen speciationin fine and coarse clay fractions of a cryoboroll - newevidence from pyrolysis-mass spectrometry and nitrogenK-edge XANES. Canadian Journal of Soil Science, 90,309-318
Leinweber P, Jandl G, Eckhardt K U, Schlichting A, HofmannD, Schulten H R. 2009. Analytical pyrolysis and softionizationmass spectrometry. In: Senesi N, Xing B, HuangP M, eds., Biophysico-Chemical Processes InvolvingNatural Nonliving Organic Matter in EnvironmentalSystems. John Wiley & Sons, Chichester, Eng land. pp.539-588
Leinweber P, Kruse J, Bum C, Arcand M, Knight J D, FarrellR, Eckhardt K U, Kiersch K, Jandl G. 2013. Advancesin understanding organic nitrogen chemistry in soilsusing state-of-the art analytical techniques. Advances inAgronomy, 119, 83-151
Leinweber P, Schulten H R. 1998a. Advances in analyticalpyrolysis of soil organic matter. Journal of Analytical andApplied Pyrolysis, 47, 165-189
Leinweber P, Schulten H R. 1998b. Nonhydrolyzable organicnitrogen in soil size sepa rates from long-term agriculturalexperiments. Soil Science Society of America Journal,62, 383-393
Leinweber P, Schulten H R. 2000. Nonhydrolyzable formsof soil organic nitrogen: Extractability and composition.Journal of Plant Nutrition and Soil Science, 163, 433-439
Li J M, Li S X. 2003. Relation of mineralizable N to organicN components in dark loessial soils. Pedosphere, 13,279-289
Li R G, Wang S M, Wang K W, Wu Y Z, Wu W K. 1982.Studies on the uptake of soil N and fertilizer by winterwheat and N balance. Chinese Journal of Soil Science,13, 21-22 (in Chinese)
Li S Q, Li S X, Li D F. 2002a. Effects of long-tem applicationof fertilizers on amount of amino acid in soils. ScietiaAgricultura Sinica, 35, 63-67. (in Chinese)
Li S Q, Li S X, Yang Z L. 2002b. Contents and amountsof amino acid in different ecological system soils. ActaEcologica Sinica, 22, 279-385. (in Chinese)
Li S X, Ai S Y, Gao Y J. 1992. The behavior of nonexchangeableammonium in soils. IV. The vertical andlevel distribution of non-exchangeable ammonium andthe relationships between the distribution and soil calycontents. Acta Universitatis Agriculturalis Boreali-Occidentalis, 20(Suppl.), 90-94 (in Chinese)
Li S X, Cun D G, Gao Y J, He H X, Li S Q. 1993. Mineralnitrogen introduced into soil by precipitation on theLoess Plateau. Agricultural Research in the Arid Areas.11(Suppl.), 83-92 (in Chinese)
Li S X, Wang Z H, Hu T T, Gao Y J, Stewart B A. 2009.Nitrogen in dryland soils of China and its management Advances in Agronomy, 101, 123-181
Li S X, Wang Z H. 2006. Dryland agriculture in EasternAsia. In: Peterson G A, Unger P W, Payne W A, eds.,Dryland Agriculture. 2nd ed. Agronomy Monograph No.23. American Society of Agronomy, Crop Science Societyof America, Soil Science Society of America, Madison,USA. pp. 671-731
Lowe L E. 1973. Amino acid distribution in forest humuslayers in British Columbia. Soil Science Society of AmericaProceedings, 37, 569-572
Lü D Q, Li Y. 1987. Enhancement of the rate of nitrogenutilization for increasing wheat production on LoessPlateau. In: Proceedings of the International Symposiumon Dryland Farming. September 18-22, 1987, Yangling,Shaanxi, China Northwest Agricultural University Press,China. pp. 236-248.
Melillo J M. 1981. Nitrogen cycling in deciduous forests.In: Clark F E, Rosswall T, eds., Terrestrial NitrogenCycles: Processes, Ecosystem Strategies and ManagementImpacts. Ecological Bullins, Stockholm. pp. 427-442
Melnitchouck A, Leinweber P, Eckhardt K U, Beese R. 2005.Qualitative differences between day- and night-timerhizodeposition in maize (Zea mays L.) as investigated bypyrolysis-field ionization mass spectrometry. Soil Biology& Biochemistry, 37, 155-162
Miao Y F, Li S X, Fu Y Y, Wand Z H, Xu X F, Luo L C. 2014.Characteristics of ammonium N and nitrate N accumulationin dryland soil in relation with wheat yield. ChineseJournal of Applied Ecology, 24, 1171-1180 (in Chinese)
Miki K, Kawato Y, Mori T. 1966. fractionation and estimationof organic nitrogen compounds in soil. Tentative methodusing the Kjeldahl distillation apparatus. Journal of Scienceof Soil and Manure, 37, 542-546 (in Japanese)
Mikutta R, Kaiser K, Dörr N, Vollmer A, Chadwick OA, Chorover J, Kramer M G, Guggenberger G. 2010.Mineralogical impact on organic nitrogen across a longtermsoil chronosequence (0.3-4100 kyr) Geochimica etCosmochimica Acta, 74, 2142-2164.
Mulvaney R L, Khan S A. 2001. Diffusion methods todetermine different forms of nitrogen in soil hydrolysates.Soil Science Society of America Journal, 65, 1284-1292
Nanjing Institute of Soil Science, Academia Sinica. 1978.Soils of China. Science Press. Beijing, China. pp. 360-375 (in Chinese)
Näsholm T, Kielland K, Ganeteg U. 2009. Uptake of organicnitrogen by plants. New Phytologist, 182, 31-48
Olk D C. 2008. Organic forms of soil nitrogen. In: SchepersJ S, Raun W R, eds., Nitro gen in Agricultural Systems.American Society of Agronomy, USA. pp. 57-100
Paul E A, Schmidi E L. 1960. Extraction of free amino acidsfrom soil. Soil Science Society of America Proceedings,24, 195-198
Peng L, Peng X L. 1982. Regionalization of the soil N contentson the Loess Plateau and ways for raising its amounts.Bulletin of Water and Soil Conservation, 2, 30-35. (inChinese)
Peng W Y, Li H S. 1991. Soil N composition under multiplecropping rice. Chinese Journal of Soil Science, 22, 122-124 (in Chinese)
Polglase P J, Comerford N B, Jokela E J. 1992. Mineralizationof nitrogen and phosphorus from soil organic matter insouthern pine plantations. Soil Science Society of AmericaJournal, 56, 921-927
Proston C M, Rauthan B S. 1982. A hydrogen-1, carbon-13and nitrogen-15 nuclear magnetic resonance study ofp-benzoguinone polymers incorporating amine nitrogencompounds (“synthetic humic acids”) Soil Science, 134,277-293
Roberts P, Bol R, Jones D L. 2007. Free amino sugar reactionsin soil in relation to soil carbon and nitrogen cycling. SoilBiology & Biochemistry, 39, 3081-3092.
Russell E W. 1973. Soil Condition and Plant Growth. 10th ed.Longmans, Green, New York.
SAADS (Shaanxi Academy of Agricultural Design andSurvey). 1979. Fertile Water Wells. The Exploitationand Utilization of the Fertile Water from Wells. ShaanxiPeople’s Publishing House, Xi’an, Shaanxi, China. pp.1-9 (in Chinese)
Schimel J P, Bennett J. 2004. Nitrogen mineralization:Challenges of a changing paradigm. Ecology, 85, 591-602
Schnitzer M, Spiteller M. 1986. The chemistry of the unknownsoil nitrogen. XIII. In: the Organizing Committee, ed.,Transsction of the 13th Congress of International Society ofSoil Science, vol. 2, 473-474 Congress of the InternationalSociety of Soil Science, Hamburg, 13-20 August, 1986
Schulten H R, Leinweber P 2000. New insights into organicmineralparticles: composi tion, properties and models ofmolecular structure. Biology and Fertility of Soils, 30,399-432
Selmer-Olsen A R, Oien A, Baetrug R, Lyngstad I. 1981.Evaluation of a KCl-hydrolyzing method for availablenitrogen in soil by pot experiments. Acta AgriculturaeScandinavica, 31, 251-255
Shaymukhametov M S. 1977. Improved method fordetermining amino acids and hexosamine samine nitrogenin soils. Soviet Soil Science, 9, 503-504
(in Russian)Shen Q R, Si R H. 1990. Studies on the chemical compositionof organic N of different soils and their availability. ActaPedologica Sinica, 21, 54-57
(in Chinese)Shi S L,Wen Q X, Liao H Q, Zhou K Y. 1992. Influence ofcultivation on distribution of nitrogen forms and aminoacid composition in soils. Soils, 24, 14-18 (in Chinese).
Shi W M, Chino M, Youssef R A, Mori S, Takagi S. 1988.The occurrence of mugineic acid in the rhizosphere soil ofbarley plant. Journal of Plant Nutrition and Soil Science,34, 584-592
Sims J R, Jackson G D. 1971. Rapid analysis of soil nitratewith chromotropic acid. Soil Science Society of AmericanProceedings, 35, 603-606
Song Q. 1988. Studies on the distribution and characteristics ofsoil organic nitrogen in some soils of China. Acta PedeloicaSinica, 25, 95-100. (in Chinese)
Soil Taxonomy Group, Nanjing Soil Institute, ChineseAcademy and Cooperative Research Group on ChineseSoil Taxonomy. 1995. Chinese Soil Taxonomy. ChinaAgricultural Science and Technology Press, China. pp.58-179 (in Chinese)
Sowden J F. 1959. Investigations on the amounts ofhexosamines found in various soil and methods for theirdetermination. Soil Science, 88, 138-143
Sowden J F. 1977. Distribution of nitrogen in representativeCanadian soils. Canadian Journal of Soil Science, 57,445-457
Stevenson F J. 1956. Effect of some long-term rotation on theamino acid composition of the soil. Soil Science Society ofAmerica Proceedings, 20, 204-208
Stevenson F J. 1957a. Dynamics of the forms of nitrogenin some soil profiles. Soil Science Society of AmericaProceedings, 21, 283-287
Stevenson F J. 1957b. Investigations of amino-polysaccharidesin soil. Soil Science, 83, 113-122
Stevenson F J. 1965. Origin and distribution of nitrogen insoil. In: Bartholomev W V, Clark F E, eds., Soil Nitrogen.America Society of Agronomy, Madison, Wisconsin. pp.1-42
Stevenson F J. 1982. Organic forms of soil nitrogen. In:Stevenson F J, ed., Nitrogen in Agricultural Soils. AmericaSociety of Agronomy, Madison, Wisconsin.
Tang Y X, Zhang J H, Xu X C, Dong G. L. 1986. Soil Nsupplying capacity, fertilizer N recovery and their use inpractice. Chinese Journal of Soil Science, 17, 204-208(in Chinese)
Tsunogai S. 1971. Ammonia in the oceanic atmosphere and thecycle of nitrogen compounds through the atmosphere andthe hydrosphere. Geochemical Journal, 5, 57-67
Wang T S C, Yang T K, Cheng S Y. 1967. Amino acids insubtropical soil hydrolysates. Soil Science, 103, 67-74
Wang Y, Cai D T, Shi R H. 1991. Availability of fertilizerresidual N and its relationship with distribution ofresidual N fractions. Acta Pedologica Sinica, 30, 19-25 (in Chinese)
Wen Q X (Chief Editor). 1984. Methods for Investigation ofSoil Organic Matter. China Agriculture Press, Beijing. pp.78-90, 292-315 (in Chinese)
Wen Q X. 1997. Forms and amounts of nitrogen in soil. In:Zhu Z L, Wen Q X, Freney J R, eds., Nitrogen in Soils ofChina. Kluwer Academic Publishers, Dordrecht/Boston/London. pp. 1-30
Vitousek P M, Walker L R, Whiteaker L D, Matson PM. 1993. Nutrient limitations to plant growth duringprimary succession in Hawaii Volcanoes National Park.Biogeochemistry, 23, 197-215
Woodmansee R G, Vallis I, Mott J J. 1981. Grassland nitrogen.In: Clark F E, Rosswall T, eds., Terrestrial NitrogenCycles: Processes, Ecosystem Strategies and ManagementImpacts. Ecological Bullins, Stockholm. pp. 443-462
Vranova V, Rejsek K, Skene K R, Formanek P. 2011. Nonproteinamino acids: Plant, soil and ecosystem interactions.Plant and Soil, 342, 31-48
Wright R F, Rasmussen L. 1998. Introduction to the N ITREXand EXMAN projects. Forest Ecology and Management,101, 1-7
Wu G Y. 1986. Forms, distribution and decomposition of soilorganic nitrogen. Acta Pedologica Sinica, 17, 90-95. (inChinese)
Xu C X, Wu S R. 1991. Composition of organic nitrogen inLou soil and its changes under fertilization conditions.Chinese Journal of Soil Science, 27, 90-95. (in Chinese)
Yamamuro S. 1980. Proposal of a method for analysis of freeamino acids in paddy soils and investigation on behaviorof them in rice growth period. Journal of Science of Soiland Manure, 51, 131-135 (in Japanese)
Yan D Z, Wang D J, Yang L Z. 2007. Long-termeffect of chemical fertilizer, straw, and manureon labile organic matter fractions in a paddy soil.Biology and Fertility of Soils, 44, 93-101
Ye W, Cheng L L, Wen Q X. 1991. Contents and partialcharacterization of unknown N in humic acids. Pedosphere,1, 283-287
Zhang F D, Sun X. 1984. Studies on the utilization of aminoacids by rice seedlings. Scientia Agricultura Sinica, 5,61-66 (in Chinese)
Zhang X D, Xu X C, Chen E F. 1989. Change in amino acidcontent of soils after application of pig manure. ChineseJournal of Soil Science, 20, 260-262 (in Chinese)
Zhang X H, Du L J, Wen Q X. 1984. Organic matter distributionin particle-size fractions in plow layer of some paddy soils.Acta Pedologica Sinica, 21, 418-425 (in Chinese)
Zhao G S. 1990. Soil nitrogen state on the Loess Plateau.In: Zhu X M, ed., Agriculture on Loess Plateau. ChinaAgriculture Press, China. pp. 263-280 (in Chinese)
Zhou J B, Chen Z J, Zhen X F. 2005. Soluble organic nitrogenin soil and its roles in the supply and transformation of N.Chinese Journal of Soil Science, 36, 244-248. (in Chinese)
Zhou K Y, Shi S L. 1992. The distribution of N forms and theamino acid composition in some major soil in China. Soils,24, 285-288. (in Chinese)
Zhu Z L. 1985. Advances in soil N supplying capacity andfertilizer N pathway. Soils, 17, 1-9. (in Chinese)
Zhuo S L, Wen Q X. 1992. The unknown nitrogen in soil.Progress in Soil Science, 20, 11-18. (in Chinese)
Zhuo S N, Wen Q X. 1994. Fractionation of humic acid byfractional precipitation technique. Acta Pedologica Sinica,31, 251-258. (in Chinese)
Zou C S, Mo M H, Gu Y Q, Zhou J P, Zhang K Q. 2007.Possible contributions of volatile-producing bacteria to soil fungistasis. Soil Biology & Biochemistry, 39, 2371-2379.
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CAO Su-mei, LI Ting-ting, SHAO Yu-xin, ZHAO Yu-zhen, ZHANG Li-yang, LU Lin, ZHANG Ri-jun, HOU Shui-sheng, LIAO Xiu-dong, LUO Xu-gang, WANG Run-lian.