土地利用结构与土地生产力的关系研究

Relationship between Land Productivity and Land Use Structure

论文从流域土地利用结构变化的角度出发,提出采用土地利用结构特征指数研究土地利用结构变化特征与土地生产力之间关系的方法。以晋西黄土丘陵沟壑区典型小流域——王家沟流域为例,考虑了当年光照、温度、降水等相同自然条件下土地生产潜力的变化趋势,揭示了土地利用结构特征指数与土地生产潜力、土地生产力挖潜指数间的关系,提出了流域土地合理利用的方向。

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.