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Effect of tillage system on distribution of aggregates and organic carbon in a Hydragric Anthrosol

作者：

Ming Gao;Yilun Luo;Zifang Wang;Xin Tang;Chaofu We

单位：

College of Resources and Environment, Southwest University, Chongqing 400716 (China);College of Resources and Environment, Southwest University, Chongqing 400716 (China

关键词：

aggregates;r system;ct;02;mm;r

摘要：

The effect of different tillage systems on the size distribution of aggregates and organic carbon distribution and storage in different size aggregates in a Hydragric Anthrosol were studied in a long-term experiment in Chongqing, China. The experiment included three tillage treatments: conventional tillage with rotation of rice and winter fallow (CT-r) system, no-till and ridge culture with rotation of rice and rape (RT-rr) system, and conventional tillage with rotation of rice and rape (CT-rr) system. The results showed that the aggregates 0.02-0.25 turn in diameter accounted for the largest portion in cacti soil layer under all treatments. Compared with the CT-r system, in the 0-10 cm layer, the amount of aggregates > 0.02 turn was larger under the RT-rr system, but smaller under the CT-rr system. In tire 0-20 cm layer, the organic carbon content of all fractions of aggregates was the highest under the RT-rr system and lowest under the CT-rr system. The total organic carbon content showed a positive linear relationship with the amount of aggregates with diameter ranging from 0.25 to 2 mm. The storage of organic carbon in all fractions of aggregates under the RT-rr system was higher than that under the CT-r system in the 0-20 cm layer, but in the 0-60 cut soil layer, there was no distinct difference. Under the CT-rr system, the storage of organic carbon in all fractions of aggregates was lower than that under the CT-r system; most of the newly lost organic carbon was front the aggregates 0.002-0.02 and 0.02-0.25 mm in diameter.

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Effect of tillage system on distribution of aggregates and organic carbon in a Hydragric Anthrosol

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