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| Effects of Cropping Patterns on Soil Aggregates of Alfalfa Field |
| Cui Xing, Shi Shangli |
| College of Grassland Science/Key Ecosystem Laboratory of the Ministry of Education/Sino-US Center for Grazing land Ecosystem Sustainability/Pratacultural Engineering Laboratory of Gansu Province, Gansu Agricultural University, Lanzhou 730070, China |
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Abstract By researching alfalfa soil with five years monocropping and one year rotation in arid area of Gansu, China, the study presented the soil aggregate structure, bulk density, water content under different cropping systems. It indicated that in both systems, the aggregate structure exceeding 0.25 mm under dry sieve and wet sieve treatments tended to decline in descending soil layers and the lager aggregate structures were found with smaller fractal dimensions. With wet sieve, the 0.5~0.25 mm granules were with the highest soil aggregate. In rotation, the water content was at its highest level (13.881%) at the 0~60 cm soil, and dropped to a relatively low level (10.343%) at the 60~80 cm soil, then quickly recovered to (13.811%) at 80~100 cm. The maximum of bulk density was 1.425%, 17.6% higher than the minimum in monocroping, while in rotation cropping, the maximum was 1.432%, 18.7% higher than the minimum.
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Received: 16 September 2013
Published: 20 March 2014
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Corresponding Authors:
师尚礼（Email：shishl@gsau.edu.cn）
E-mail: shishl@gsau.edu.cn
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2014, Vol. 34 
