Soil erosion is a serious environmental problem in Guizhou Province, which is located in the centre of the karst areas of southwestern China. Unfortunately, Guizhou Province suffers from a lack of financial resources to research, monitor and model soil erosion at large watershed. In order to assess the soil erosion risk, soil erosion modeling at the watershed scale are urgently needed to be undertaken. This study integrated the Revised Universal Soil Loss Equation (RUSLE) with a Geographic Information System (GIS) to estimate soil loss and identify the risk erosion areas in the Maotiao River watershed, which is a typical rural watershed in Guizhou Province. All factors used in the RUSLE were calculated for the watershed using local data. It was classified into five categories ranging from minimal risk to extreme erosion risk depending on the calculated soil erosion amount. The soil erosion map was linked to land use, elevation and slope maps to explore the relationship between soil erosion and environmental factors and identify the areas of soil erosion risk. The results can be used to advice the local government in prioritizing the areas of immediate erosion mitigation. The integrated approach allows for relatively easy, fast, and cost-effective estimation of spatially distributed soil erosion. It thus indicates that RUSLE-GIS model is a useful and efficient tool for evaluating and mapping soil erosion risk at a large watershed scale in Guizhou Province.
The distinctive changes in China's rural land policy and administration have exerted significant impacts on China's rural socioeconomic development and grain production, either positively or negatively. This article reviews the changes of China's rural land policy and administration in the recent 5 decades. After the land reform accomplished in 1952 and the people's commune system implemented during 1952-1978, China adopted a house responsibility system, which was proven to be effective for increasing grain output and peasants' income. Yet, it preserved the urban-rural dichotomous economy, formed in the people's commune era, which placed agriculture in a secondary position. The low efficiency in agricultural production and the small-scale household management, under the current rural land policy and administration, stimulated the transfers of agricultural laborers to the nonagricultural sectors and cultivated land to urban land. Grain production and cultivated land protection in China are conducted most times under the political mandates rather than the economic guidance. Although the previous rural land policies and the strict residence registration helped China to avoid problems prevailing in prime cities of other developing countries, compulsorily asking peasants to grow more grain and to stay in their native land resulted in outstanding social injustice, vulnerable grain production systems, and poverty in rural areas. There are also outstanding conflicts among the interests of central government, local governments, collectives, and peasant households. More flexible rural land policies and more strict cultivated land administrations could be solutions for improving the profitability of grain production and protecting the rapidly declining cultivated land. Compensations for the low profitability in grain production are also needed to encourage an increase in grain output and rural economy. Copyright 2006 by The Policy Studies Organization.
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