关键词: 土地利用结构特征指数, 土壤侵蚀, 土地生产力, 土地挖潜指数

Abstract: Severe soil erosion and low land productivity have become serious ecol ogical problems in the Loess Plateau region.This paper focuses on the relationsh ip between land use structure and land productivity through a case study at Wang jiagou watershed in western Shanxi. It is indicated that there are remarkable linear relevant relations betwee n the potential productivity and the land use structure index (SI).The potential productivity would increase with the increase of SI.Another index PrI is introd uced and well defined as the rate between the disparity of the potential product ivity and actual productivity.The PrI and SI have good linear positive correlati ons.The larger the PrI and SI,the more pains to increase actual yield.The mechan ism on how the landuse structure affecting the land productivity is revealed. Soil erosion would be decreased with the increase of SI.As a result,the l oss of soil fertility can be improved.Therefore,land use structure can be adjust ed properly so as to improve the land productivity.Therefore, wise planning for regional land use structure and conservation of soil and water would be helpful to gain more crops.Consequently,both economic and ecological benefits could be o btained in the same process.

Key words: land use structure index (SI), soil erosion, land productivity (PrI)