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FORMS OF SOIL PHOSPHORUS AND P ADSORPTION IN SOILS UNDER
Authors
党廷辉
周丽萍
+3 more
戚瑞生
杨绍琼
马瑞萍
Publication date
1 January 2012
Publisher
Abstract
通过对黄土旱塬地区长期定位施肥(26a)条件下的不同轮作系统的土壤磷素形态和吸持参数的测定,研究了轮作和施肥对土壤磷素吸持特性和磷素形态的影响,以及土壤磷素吸持参数与磷素形态之间的关系。结果表明,长期轮作与施肥均可以减低土壤磷素的最大吸附量(Qm),相对于其他轮作和连作,在氮磷(NP)施肥下,小麦-玉米-豌豆轮作可以减低土壤的Qm,在氮磷有机肥(NPM)施肥下,小麦-玉米轮作可以减低土壤的Qm。在施肥相同的条件下,小麦-玉米轮作和小麦-豌豆轮作可以显著增加土壤中各形态无机磷的含量,长期轮作较连作可以增加土壤中的有效磷养分,尤其对Ca2-P的提高效果更为显著。相关分析表明,Qm和磷吸持指数(PSI)与全磷(T-P)、Olsen-P、CaCl2-P、Ca2-P、Ca8-P、Fe-P、Ca10-P和有机磷呈极显著负相关(p<0.01),与闭蓄态磷(O-P)呈显著负相关(p<0.05),与Al-P关系不显著。土壤有机质(SOM)与Qm、PSI和磷最大缓冲能力(MBC)之间存在极显著负相关关系,与磷吸持饱和度(DPSS)存在显著正相关。通径系数和逐步回归分析表明,在石灰性黑垆土土壤的</span
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018