Spatial Distribution of Water-stable Aggregates N and P Under the Long-term Fertilization in the Different Organic Matter Contents of Farmland Black Soil

doi:10.11924/j.issn.1000-6850.2013-2340

Abstract

Abstract: Based on long-term soil removal method in Hailun ecological station, Chinese Academy of Science, it was studied for water-stable aggregate fractions, total N and total P in various aggregates fractions and their relationship under the long-term fertilization in the different organic matter of farmland black soil. The research helps to provide theoretical basis for influence mechanism of fertilization on the changes of black soil fertility. The results showed that the long-term chemical fertilization made the most important effect on macroaggregates fractions (2-1 mm), and its content increased by 1.94%-4.59%. Various aggregates fractions increased gradually with soil organic matter increasing. For different farmland black soils, the contents of total N and total P is the highest in macroaggregate fractions (2-1 mm), and the lowest in aggregate fractions (>5 mm, <0.25 mm). Soil aggregates (2-0.5 mm) had positive relationship with total N and total P, but soil aggregates (>5 mm, <0.25 mm) were significantly negative correlation with them. Soil total N and total P mainly existed in macroaggregates. The used chemical fertilizer might increase the content of total N and total P in water-stable aggregates, which is the effective measure for improving soil structure of farmland black soil and increasing soil fertility.

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