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Composition and stability of soil aggregates in hedgerow-crop slope land.

PU Yu-lin1,2,3, LIN Chao-wen4, XIE De-ti1,3, WEI Chao-fu1,3, NI Jiu-pai1,3   

  1. (1College of Resources and Environment, Southwest University, Chongqing 400715, China; 2College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China; 3Chongqing Engineering Research Center for Agricultural Nonpoint Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400716, China; 4Institute of Soil and Fertilizer, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China)
  • Online:2013-01-18 Published:2013-01-18

Abstract: Based on a long-term experiment of using hedgerow to control soil and water loss, this paper studied the composition and stability of soil aggregates in a hedgerow-crop slope land. Compared with those under routine contour cropping, the contents of >0.25 mm soil mechanical-stable and water-stable aggregates under the complex mode hedgerowcrop increased significantly by 13.3%-16.1% and 37.8%-55.6%, respectively. Under the complex mode, the contents of >0.25 mm soil water-stable aggregates on each slope position increased obviously, and the status of >0.25 mm soil wate-stable aggregates being relatively rich at low slope and poor at top slope was improved. Planting hedgerow could significantly increase the mean mass diameter and geometric mean diameter of soil aggregates, decrease the fractal dimension of soil aggregates and the destruction rate of >0.25 mm soil aggregates, and thus, increase the stability and erosion-resistance of soil aggregates in slope cropland. No significant effects of slope and hedgerow types were observed on the composition, stability and distribution of soil aggregates.