Amundson R. 2001. The carbon budget in soils. Annual Review of Earth and Planetary Sciences, 29, 535-562 Baldocchi D, Falge E, Gu L, Olson R, Hollinger D. 2001. Fluxnet: A new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor, and energy flux densities. Bulletin of the American Meteorological Society, 81, 2415-2434 Campbell B, Frost P, King J, Mawanza M, Mhlanga L. 1994. The influence of trees on soil fertility on two contrasting semi-arid soil types at Matopos, Zimbabwe. Agroforestry Systems, 28, 159-172 Chen C, Hou H P, Li Q, Zhu P, Zhang Z Y, Dong Z Q. 2010. Effects of panting density on photosynthetic characteristics and changes of carbon and nitrogen in leaf of different corn hybrids. Acta Agronomica Sinica, 36, 871-878 (in Chinese) Cong R, Wang X J, Xu M G, Zhang W J. 2012. Dynamics of soil carbon to nitrogen ratio changes under long- term fertilizer addition in wheat-corn double cropping systems of China. European Journal of Soil Science, 63, 341-350 Diekow J, Mielniczuk J, Knicker H, Bayer C, Dick D P, Kogel-Knabne I. 2005. Soil C and N stocks as affected by cropping systems and nitrogen fertilisation in a southern Brazil Acrisol managed under no-tillage for 17 years. Soil and Tillage Research, 81, 87-95Dossa E, Khouma M, Diedhiou I, Sene M, Kizito F. 2009.Carbon, nitrogen and phosphorus mineralizationpotential of semiarid Sahelian soils amended with nativeshrub residues. Geoderma, 148, 251-260Fang J Y, Guo Z D, Piao S L, Chen A P. 2007. Estimationof Chinese terrestrial vegetation carbon stock from 1981to 2000. Science in China (Series D: Earth Sciences), 37,804-812Fang J Y, Liu G H, Fu B R. 2000. Carbon dynamics of Chinese forests and its contribution to global carbonbalance. Acta Ecologica Sinica, 20, 733-740. (inChinese)FAO F. 1988. UNESCO soil map of the world, revisedlegend. World Resources Report, 60, 138.Fornara D, Tilman D. 2008. Plant functional compositioninfluences rates of soil carbon and nitrogen accumulation.Journal of Ecology, 96, 314-322Jafari M, Kohandel A, Baghbani S, Tavili A, Chahouki MA Z. 2011. Comparison of chemical characteristics of shoot, root and litter in three range species of Salsolarigida, Artemisia sieberi and Stipa barbata. CaspianJournal Environment Science, 9, 37-46Jobbágy E G, Jackson R B. 2000. The vertical distributionof soil organic carbon and its relation to climate andvegetation. Ecological Applications, 10, 423-436Lal R. 2002. Carbon sequestration in dryland ecosystems of West Asia and North Africa. Land Degradation & Development, 13, 45-59Li C, Li Y, Tang L. 2010. Soil organic carbon stockand carbon efflux in deep soils of desert and oasis.Environmental Earth Sciences, 60, 549-557Li G, Jiang G M, Li Y G, Liu M Z. 2011a. Biomass carbonstorage and net primary production in different habitatsof Hunshandake Sandland, China. Acta Ecologica Sinica, 31, 217-224Li L J, Zeng D H, Yu Z Y, Fan Z P, Yang D, Liu Y X. 2011b. Impact of litter quality and soil nutrient availability on leaf decomposition rate in a semi-arid grassland of Northeast China. Journal of AridEnvironments, 75, 787-792Lufafa A, Diedhiou I, Ndiaye N A S, Sene M, Kizito F, DickR P, Noller J S. 2009. Allometric relationships and peakseasoncommunity biomass stocks of native shrubs inSenegal’s Peanut Basin. Journal of Arid Environments,73, 260-266Maestre F T, Cortina J. 2003. Small-scale spatial variationin soil CO2 efflux in a Mediterranean semiarid steppe.Applied Soil Ecology, 23, 199-209Mi H L, Xu X, Li S H, He J, Ma Y M. 2005. Dynamic change of the contents, distributions and ratioes of carbohydrate and total nitrogen in Cynanchum komaroviiand Glycyrrhiza uralensis during the different periods of growth. Agricultural Research in the Arid Areas, 23,129-133 (in Chinese)Porazinska D L, Bardgett R D, Blaauw M B, Hunt H W, Parsons A N, Seastedt T R, Wall D H. 2003. Relationships at the aboveground-belowground interface:plants, soil biota, and soil processes. EcologicalMonographs, 73, 377-395Sanchez F G. 2001. Loblolly pine needle decomposition andnutrient dynamics as affected by irrigation, fertilization,and substrate quality. Forest Ecology and Management,152, 85-96Shiyomi M, Akiyama T, Wang S, Yiruhan, Ailikun, HoriY. 2011. A grassland ecosystem model of the Xilingol steppe, Inner Mongolia, China. Ecological Modelling,222, 2073-2083Walkley A, Black I A. 1934. Estimation of soil organic carbon by the chromic acid titration method. SoilScience, 37, 29-38Wang Y, Li Y, Ye X, Chu Y, Wang X. 2010. Profile storageof organic/inorganic carbon in soil: From forest to desert.Science of the Total Environment, 408, 1925-1931Wendt K. 1999. Determination of nitrate/nitrite in surface and wastewaters by flow injection analysis. In: ZellwegerAnalytics-Lachat Instruments. Methods Manual.QuickChem Method. pp. 10-107White I, Welty-Bernard A, Rasmussen C, Schwartz E. 2009.Vegetation controls on soil organic carbon dynamics inan arid, hyperthermic ecosystem. Geoderma, 150, 214-223Wohlfahrt G, Fenstermaker L F, Arnone J A. 2008. Large annual net ecosystem CO2 uptake of a Mojave desert ecosystem. Global Change Biology, 14, 1475-1487Xie J, Li Y, Zhai C, Li C, Lan Z. 2009. CO2 absorption byalkaline soils and its implication to the global carboncycle. Environmental Geology, 56, 953-961Xu Z, Zhou G, Wang Y. 2007. Combined effects of elevatedCO2 and soil drought on carbon and nitrogen allocationof the desert shrub Caragana intermedia. Plant and Soil,301, 87-97Yang H S, Yuan Y, Zhang Q, Tang J, Liu Y, Chen X.2011. Changes in soil organic carbon, total nitrogen,and abundance of arbuscular mycorrhizal fungi along alarge-scale aridity gradient. Catena, 87, 70-77Yuan Z Y, Li L H, Huang J H, Jiang G M, Wan S Q,Zhang W H, Chen Q S. 2005. Nitrogen resorption fromsenescing leaves in 28 plant species in a semi-arid regionof northern China. Journal of Arid Environments, 63,191-202Zeng Y X, Zhang Y J. 1997. Effects of returning straw into the field on farmland eco-environment. Agro-Environment and Development, 1, 1-7. |