Effects of Long-Term Fertilization on the Distribution of Carbon, Nitrogen and Phosphorus in Water-Stable Aggregates in Paddy Soil

Agricultural Sciences in China Pub Date : 2011-12-01 DOI:10.1016/S1671-2927(11)60194-6

Wei WANG , Wei-cai CHEN , Kai-rong WANG , Xiao-li XIE , Chun-mei YIN , An-lei CHEN

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引用次数: 53

Abstract

We investigated the size distribution of water-stable aggregates and the soil carbon, nitrogen and phosphorus concentration over aggregate size fractions based on a long-term (1990-2006) fertilization experiment in a reddish paddy soil. The results showed that the largest water-stable aggregate (WSA) (>5 mm) and the smallest WSA (<0.25 mm) took up the first largest proportion (38.3%) and the second largest proportion (23.3%), respectively. Application of organic materials increased the proportion of the large WSA (>2 mm) and decreased the proportion of the small WSA (<1 mm), resulting in an increase in the mean weight diameter of WSA, whereas application of chemical fertilizer had little effect. Application of organic materials, especially combined with chemical fertilizers, increased total carbon, nitrogen and phosphorus concentrations in all sizes of WSA, and total carbon, nitrogen and phosphorus were prone to concentrate in the large WSA. Further more, application of organic materials improved the supply effectiveness of available phosphorus, whereas had little influence on the labile carbon in WSA. Application of chemical fertilizers improved concentrations of total and available phosphorus in all sizes of WSA, whereas had little influence on total carbon and nitrogen contents. Economical fertilization model maintained the soil fertility when compared with full dose of chemical fertilizers, indicating that using organic materials could reduce chemical fertilizers by about one third.

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长期施肥对水稻土水稳性团聚体碳、氮、磷分布的影响

摘要通过长期(1990-2006)施肥试验，研究了红壤水稻土水稳性团聚体粒径分布及团聚体粒径组分土壤碳、氮、磷浓度。结果表明:最大的水稳性骨料(WSA) (>5 mm)和最小的水稳性骨料(<0.25 mm)所占比例分别为第一(38.3%)和第二(23.3%);施用有机肥增加了大WSA (>2 mm)的比例，降低了小WSA (<1 mm)的比例，导致WSA平均重径增加，而施用化肥影响不大。有机肥的施用，特别是与化肥的配合施用，提高了各粒径WSA中总碳、氮、磷的浓度，且总碳、氮、磷倾向于向大型WSA集中。有机质的施用提高了速效磷的供给效率，而对活性碳的影响不大。施用化学肥料提高了各粒径水杨浆的全磷和速效磷浓度，而对总碳和总氮含量影响不大。与全量施肥相比，经济施肥模式保持了土壤肥力，表明使用有机材料可以减少约三分之一的化肥。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Agricultural Sciences in China AGRICULTURE, MULTIDISCIPLINARY-

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3.2 months