文献类型： 会议论文

第一作者： Shui Jianguo

作者： Shui Jianguo ¹ ; Liu Chacha;

作者机构： 1.Zhejiang Academy of Agricultural Sciences, Hangzhou Zhejiang Province, 310021, P.R.China

关键词： soil-water losses;run off coefficient;vegetative coverage;permissible soil erosion;hilly red-earth region

会议名称： Sustainable Utilization of Global Soil and Water Resources vol.1:Soil and Water Conservation Regional Policies and Action

主办单位：

页码： 210-216

摘要： The observations from 14-yr long-term investigation on the soil-water losses in the sloping red-earth (slope 8°-15°) showed that: soil-water losses were closely correlated with land slope and vegetative coverage. Runoff rate in sloping red-earth could be reduced duplicately by exploitation, while the soil erosion was enhanced duplicately during the first 2 years after exploitation. Subsequently, soil erosion tended to be stable. Soil erosion was high positively correlated with land slope, i.e. soil erosion was increased by 120t/(km~2 · a) with a slope increase of 1°. On the contrary, soil erosion was high negatively correlated with vegetative coverage, i.e. soil erosion was limited at below 200t/( km~2 · a), when the vegetative coverage exceeded 60%. Furthermore, soil erosion was highly related with planting patterns, i.e. soil erosion in contour cropping pattern would be one sixth of that in straight cropping. Based on the view of soil nutrient balance, we first suggested that the acceptable soil erosion in Q_2 red clay derived red-earth should be lower than 300t/(km~2 · a). Contour cropping and contour plant hedgerow might be effective practices to control soil erosion at below 100t/(km~2 · a). For the relative poor farmers, to use dry rice hedgerow will gain both short-term benefits and long-term benefits.

分类号： S157