The impact of land use on soil texture in Shixia watershed of Miyun County, Beijing
Received date: 2001-05-03
Revised date: 2001-07-17
Online published: 2001-12-15
Varying soil loss resulting from different land use leads to problems of soil coarsening to different degrees in Beijing hilly area. In this paper, the data of conventional tillage plot, the fallow plot and the wasteland plot at Miyun county, Beijing were used. The topsoil samples and profile samples were taken from the upper, middle and down slopes of the plots. The soil samples were sieved. Then the rock fragment samples, whose diameter is over 2 mmeach, were weighted by means of sieving. The percentage of rock fragments in the samples was calculated. The results show that thepercentageof rock fragments in fallow plot is the highest and the percentageof rock fragments in wasteland is the smallest. Provided the percentage of rock fragments in the samples of wasteland was known at a normal value, and the soil textureindex was expressed with the ratio of the percentageofrock fragments for other land use to the one in wasteland, then the indexes of fallow land, conventional tillage plot and wasteland are 2.96, 2.07 and 1, respectively. The characteristic of soil coarsening in section varies with different land use purposes.The section at wasteland is free from soil coarsening, while the sections at fallow plot and conventional tillage plot experience apparent soil coarsening. The results can be applied for land use planing and soil degradation evaluation.
Key words： Shixia watershed; land use; soilcoarsening; soil textureindex
FU Su-hua, DUAN Shu-huai, LIU Bao-yuan . The impact of land use on soil texture in Shixia watershed of Miyun County, Beijing[J]. GEOGRAPHICAL RESEARCH, 2001 , 20(6) : 697 -702 . DOI: 10.11821/yj2001060007
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