海南岛生态系统土壤保持空间分布特征及生态经济价值评估

The spatial distribution characteristics and eco economic value of soil conservation service of ecosystems in Hainan Island by GIS

在地理信息系统的支持下 ,采用通用土壤流失方程 ( USLE)及其修改式估算了海南岛现实土壤侵蚀量和潜在土壤侵蚀量 ,得到了海南岛生态系统土壤保持的空间分布特征 ,研究表明 :中部山区的生态系统的土壤保持能力较其它地区大 ,全岛年土壤保持总量为 1 .58× 1 0 7t,并利用市场价值法 ,机会成本法和影子工程法评价了各类型生态系统的土壤保持价值。海南岛年土壤保持总价值为 74 92 .4 1万元 ,其中减少土地废弃价值为 4 9.37万元 ,保护土壤肥力价值为 72 74 .2 2万元 ,减轻泥沙淤积价值为 1 68.

This paper attempts to apply Geographic Information System(GIS)technology,and utilizes the Universal Soil Loss Equation(USLE)to estimate the potential soil losses and the actual soil losses in Hainan Island.Some important data such as the spatial distribution characteristics of soil conservation of ecosysstems in Hainan Island have been got.The results shows the soil conservation capacities of the mid mountain area ecosystems are the strongest in Hainan Island.The market valuation,opportunity cost and shadow engineering methods are used to evaluate the function of soil conservation of ecosystems.The research results reveal that the total value of Hainan Island soil conservation adds up to about 74.92 million yuan(RMB)per annum,of which,about 0.49 million yuan is of decreasing soil loss,about 72.74 million yuan of holding nutrient for N,P and K,and about 1.69 million yuan of reducing reservoir silt.