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| Effects of Planting Patterns on Stability and Organic Carbon Content of Soil Aggregate |
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| DOI：10.16768/j.issn.1004-874X.2020.05.007 |
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| Abstract: |
| 【Objective】Maize and soybean intercropping is a common farming system in many regions of China. The change of soil aggregates after intercropping is studied to provide scientific basis for improving the soil structure of intercropping system based on maize and soybean.【Method】In this experiment, three treatments of bare land, soybean
monocropping, and maize and soybean intercropping were set to analyze the effects of different planting patterns on the contents of soil water-stable aggregates, the stability of water-stable aggregates and the organic carbon contents of aggregates.【Result】In the 0-20 cm soil layer, R0.25（＞ 0.25mm water-stable aggregate content）, MWD（mean weight diameter）and GMD（geometric mean diameter）of intercropping and monocropping were significantly higher than those of bare land, which was shown as monocropping ＞ intercropping ＞ bare land. The D（fractal dimension）of intercropping was significantly reduced by 2.33% compared with that of bare land. In the 20-40cm soil layer, R0.25, MWD and GMD of intercropping increased by 10.05%, 22.45% and 16.13% while D decreased by 0.40% compared with those of monocropping. There were significant differences in organic carbon contents in aggregates under different planting patterns. In the 0-20 cm soil layer, compared with monocropping, the organic carbon content under intercropping significantly increases by 15.15% in ＞ 2 mm aggregate and increases by 14.82% in 2-1 mm aggregate; in the 20-40 cm soil layer, the organic carbon content in ＞2 mm aggregate under intercropping was significantly increased by 31% compared with that of monocropping.【Conclusion】Intercropping changed the characteristics of soil aggregates and increased the contents of organic carbon in aggregates. |
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