| Stalk returning and continuous cotton cropping on soil water stable aggregate |
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| DOI：10.7606/j.issn.1000-7601.2017.01.05 |
| Key Words: straw returning long-term continuous cropping cotton water stable aggregate stability of aggregate |
| Author Name | Affiliation | | CAO Jing-jing | Agricultural College, Shihezi University, Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan, Shihezi, Xinjiang 832003, China | | WEI Fei | Agricultural College, Shihezi University, Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan, Shihezi, Xinjiang 832003, China | | MA Fang-xia | Agricultural College, Shihezi University, Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan, Shihezi, Xinjiang 832003, China | | LIU Jun | Agricultural College, Shihezi University, Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan, Shihezi, Xinjiang 832003, China | | HUANG Jing-hua | Agricultural College, Shihezi University, Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan, Shihezi, Xinjiang 832003, China | | LIU Jian-guo | Agricultural College, Shihezi University, Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan, Shihezi, Xinjiang 832003, China |
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| Abstract: |
| The objective of the experiment is to study the effect of straw incorporation on water stable aggregate distribution and organic carbon in the continuous cropping cotton field, providing scientific basis for long-term continuous cropping of cotton. This experiment had seven treatments' of continuous cropping plots, four treatments of cotton straw returning. There were three replicates for each treatment, The four treatments with cotton straw included four continuous cropping plots, such as 5, 10, 20 and 30 years, the other three treatments were 5, 10 and 20 years continuous cropping plots. The results showed that under without straw returning, with the year of continuous cropping increasing, the percentage of 1～0.25 mm water stable aggregate and water stable aggregate organic carbon were remarkably decreased, the content of <0.053 mm water-stable aggregates was gradually increased. But straw returning could significantly improved the percentage of 1～0.25 mm water stable aggregate, as well as MWD, GMD and water stable aggregate organic carbon of long-term continuous cropping. Besides, with the year of continuous cropping increasing, the percentage of >0.25 mm water stable aggregate was remarkably increased, the content of <0.053 mm water-stable aggregates was gradually decreased. The largest impact was detected for the 0～30 cm soil layer. Compared with no straw returning, straw returning and long-term continuous cropping cotton fields, with the time of continuous cropping increasing, fractal dimension (D) was gradually reduced, and aggregates fractal dimension performance increases with depth, and finally stabilized at 20～30 cm soil layer. Straw returning significantly improved the stability of water stable aggregates under long-term continuous cropping. Straw returning has a positive effect of improve soil structure and enhance soil fertility, thus mitigating the negative effect of long-term continuous cropping on soil physical properties. |
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