Effects of Conservation Tillage on the Content of Carbon, Nitrogen in Fluvo-aquic Soil

doi:10.11924/j.issn.1000-6850.casb14120093

Abstract

Abstract: The paper aims to verify organic carbon cycle under conservation tillage condition and the promotion mechanism of soil fertility, and offer scientific theory support for the popularization and application of conservation tillage techniques. The author investigated effects of different tillage treatments on the content of total organic carbon, total nitrogen and different components of them in fluvo-aquic soil based on a longterm experiment site of conservation tillage. The author revealed effects of conservation tillage on the content of carbon, nitrogen in fluvo-aquic soil by studying the distribution of soil total organic carbon, total nitrogen, dissolved organic carbon, dissolved organic nitrogen, microbial biomass carbon, liable carbon in different soil depth under different tillage treatments. The research results showed that: compared to conventional tillage treatment, content of soil total organic carbon under intermittent tillage (tillage once every 2 or 4 years) and notillage treatment were improved by 2.40%、 2.80% and 16.00%, respectively, and content of soil total nitrogen were improved by - 1.23%, 1.32% and 11.11%, respectively. Content of soil total organic carbon and total nitrogen in 10-20 cm soil layer under no-tillage treatment were significantly lower than that under the other treatments. Under the condition of straw returned, intermittent tillage and no- tillage could significantly improve the content of soil dissolved organic carbon and nitrogen in 0-5 cm and 5-10 cm soil. Compared to conventional tillage treatment, content of soil microbial biomass carbon and liable carbon in 0-5 cm soil under intermittent tillage and no-tillage were improved in varying degrees. Content of soil microbial biomass carbon in 10-20 cm soil layer under no-tillage treatment was significantly lower than that under the other treatments. Straw returning had improved the content of soil total organic carbon, total nitrogen, dissolved organic carbon and other components of active organic carbon in varying degrees. In general, conservation tillage measures could increase carbon and nitrogen storage in 0-5 cm soil layer, the negative effects of“nutrients enrichment in surface”under no-tillage condition could be ameliorated by intermittent tillage.

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