| 地形约束下的西部山区农业生产用地可持续利用评价——以甘肃南部山区26县为例 |
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| 引用本文： | 牛叔文,秦静,孙红杰,丁永霞,赵春升.地形约束下的西部山区农业生产用地可持续利用评价——以甘肃南部山区26县为例[J].资源科学,2010,32(1). |
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| 作者姓名： | 牛叔文 秦静 孙红杰 丁永霞 赵春升 |
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| 作者单位： | 兰州大学资源环境学院,兰州,730000;西部环境教育部重点实验室,兰州,730000 |
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| 摘 要： | 西部山区农民的生活主要依赖农业生产用地。人们对农业生产用地的利用超过其适宜承载能力将导致生产潜力下降、环境恶化和生态失衡。本研究以甘肃南部山区26县为例,从土地人口容载率的角度来评估其农业生产用地的可持续发展状况。土地人口容载率定义为实际供养人口与适宜供养人口之比。土地实际供养人口是由其净初级生产力的经济产值来确定;土地适宜供养人口包括:耕地、林地生产实际所需劳动力的可抚养人口和牧草地的适宜供养人口。考虑山区的特殊性,用地形复杂度校正系数来修正耕地、林地生产实际所需的劳动力。结合前人对草地适宜载畜量的研究和纯牧业县玛曲的现状,推算草地单位面积适宜承载人口为0.026人/hm2。研究分析表明:研究区农业生产用地的人口容载率为0.89,处于可持续发展的临界状态。鉴于人口增长、非农用地逐渐扩张的事实,该区域农业生产用地的可持续发展任重道远,需要开拓思路、多方并举。
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| 关 键 词： | 人口容载率 地形复杂度 农业生产用地 可持续发展 甘肃南部山区 |
An Evaluation of Sustainable Development of Agricultural Production Land Based on Terrain Constraints in Mountain Areas of Western China:A Case Study of the Southern Mountain Region of Gansu Province |
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| Abstract: | Agricultural production land is a kind of limited natural resource.which is essential for agricultural production and sustainable development,particularly for mountainous areas.As influenced by combined factors of climate,topography,vegetation,soil and hydrology,agricultural production land plays a vital role in potential productivity,environmental protection,and ecological integrity.However,excessive utilization of agricultural production land has already led to a sterile soil and vulnerable ecological environment over some areas.It is therefore quite necessary to evaluate sustainable development of agricultural production land from a perspective of the ratio of population accommodation under such circumstances.Peasants'living in mountainous areas of western China mainly depends on agricultural production land.In the present study.the authors evaluated sustainable development of agricultural production land across twenty-six counties in the southern mountain region 0f Gansu Province based on relevant data in 2006 from the perspective of the ratio of population accommodation.The ratio of population accommodation is defined as a ratio between the actual population supported by 1and and the theoretical optimum population supported by land.The actual population supported by land is defined by economic output value of the net primary productivity of agriculture production land.This concept is different from previous studies in which the total rnral population was taken as the actual population supported by agricultural production land.The theoretical optimum population supported by agricultural land includes three pans:the theoretical optimum population supported by cultivated land and forest land.which is defined by labors needed in practice,and the theoretical optimum population supported by grass land.Given some particular characteristics of mountain areas.the correction coefficient of terrain complexity was employed to modify practical labor force needed in production of cultivated and forest land.It was found that the optimum population per unit area of grassland is 0.026 people per hectare for Maqu.It was also concluded that the actual population supported by economic output value of the net primary productivity of agriculture land is about 3.31 million.while the theoretical optimum population supported by agricultural production is roughly 3.64 million.The ratio of population accommodation of the area is 0.89,which indicated that this area is at a critical status of sustainable development.Population growth and the rapid expansion of non.agricultural land would result in adverse effects on sustainable development of agricultural production land,which could be addressed by deepening the reform of the agricultural economic system over the study area. |
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| Keywords: | Ratio of population accommodation Terrain complexity Agricultural production Sustainable development Southern mountain region of Gansu province |
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