不同有机碳水平下塿土磷的有效性及无机磷形态转化

doi:10.3864/j.issn.0578-1752.2022.01.010

Abstract

Abstract:

【Objective】 The influence of organic carbon on the contents and transformation of soil in organic phosphorus fractions were investigated, which can help to formulate soil managemental strategies whereby to improve phosphorus use efficiency in tier soil.【Method】 The soil samples were collected and selected with a gradient of organic carbon levels but similar in Olsen-P (ranges from 17.41 mg·kg^-1to 18.72 mg·kg^-1) under winter wheat summer maize cropping in the Guanzhong Plain of Shaanxi Province. The organic carbon contents of the selected soil samples were 6.38, 8.34, 10.17, 11.95, 13.64 and 15.74 g·kg^-1, respectively. Then the soil inorganic phosphorus fractions (dicalcium phosphate (Ca₂-P), octa-calcium phosphate (Ca₈-P), apatite (Ca₁₀-P), aluminum bounded phosphate (Al-P), iron bounded phosphate (Fe-P) and occluded phosphate (O-P)) were analyzed with the phosphorus fractionation procedure proposed by Chang & Jackson and modified by Jiang and Gu.【Result】 The results showed that organic carbon played an important role in transformation of soil inorganic phosphorus in the winter wheat-summer maize cropping in Guanzhong Plain of Shaanxi Province. The soil Ca₂-P, Ca₈-P, Al-P, Fe-P, O-P fractions, moderately labile P (Ca₈-P, Al-P and Fe-P), and stable P (O-P and Ca₁₀-P) pools were increased significantly and linearly with increasing soil organic carbon, whereas Ca₁₀-P remained unchanged. The relative contents of labile-P (Ca₂-P), moderately labile P (mainly Al-P) were significantly and positively correlated with SOC content, but stable P (mainly Ca₁₀-P) showed significant negative correlation with SOC. Soil Olsen-P increased significantly and linearly with increasing stable P.【Conclusion】 Under the similar soil Olsen-P and total phosphorus conditions, soil organic carbon improved the availability of soil phosphorus mainly through promoting the conversion of stable P to moderately labile P and labile P in the soil, increasing the ratio of available phosphorus to inorganic phosphorus, and improving the availability of soil phosphorus. The results implied that improvement of soil fertility (SOC) could promote the activation and utilization of legacy phosphorus in soil.

Key words: fractionation of inorganic phosphorus, winter wheat-summer maize cropping, tier soil, phosphorus availability, inorganic phosphorus transformation

LU Peng,LI WenHai,NIU JinCan,BATBAYAR Javkhlan,ZHANG ShuLan,YANG XueYun. Phosphorus Availability and Transformation of Inorganic Phosphorus Forms Under Different Organic Carbon Levels in a Tier Soil[J].Scientia Agricultura Sinica, 2022, 55(1): 111-122.

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References 45

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土壤样品 Soil sample	有机碳含量 SOC (g·kg^-1)	有效磷含量 Olsen-P (mg·kg^-1)	酸度 (1﹕2.5土﹕水) pH	全磷含量 Total P (g·kg^-1)
S1	6.38f	17.41a	7.16	0.857
S2	8.34e	17.52a	7.54	1.030
S3	10.17d	17.55a	7.57	1.014
S4	11.95c	17.20a	7.61	0.990
S5	13.64b	18.10a	7.85	1.012
S6	15.74a	18.72a	7.94	1.067

	Ca₂-P	Ca₈-P	Ca₁₀-P	Al-P	Fe-P	O-P	SOC	Olsen-P	Total P	pH
Ca₂-P	1	0.624**	0.363	0.841**	0.652**	0.827**	0.923**	0.388	0.344	0.356
Ca₈-P		1	0.237	0.591**	0.621**	0.469*	0.639**	0.114	0.466	0.208
Ca₁₀-P			1	0.438	0.077	0.396	0.396	0.464	0.749**	-0.015
Al-P				1	0.412	0.854**	0.854**	0.392	0.470*	0.439
Fe-P					1	0.585*	0.639**	0.049	0.199	0.278
O-P						1	0.907**	0.326	0.307	0.410
SOC							1	0.401	0.314	0.453
Olsen-P								1	0.103	-0.008
Total P									1	0.015
pH										1

Phosphorus Availability and Transformation of Inorganic Phosphorus Forms Under Different Organic Carbon Levels in a Tier Soil

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