喀斯特石漠化地区生态恢复重建技术及其成果的价值评估——以广西平果县果化示范区为例

用土壤改良技术、表层岩溶水开发技术和生物恢复重建技术等对广西平果县果化示范区的土壤和植被等进行了恢复重建,结果是:果化示范区的植被覆盖率由2000年重建前的10%提高到2005年的50%~70%,水土流失也得到了较明显的控制,土壤侵蚀模数下降到了510.92 kg/(km2.a)。用生态经济学的原理和方法,对恢复后的生态系统服务价值进行了评估,结果表明示范区新增的间接利用价值达10186873元,间接利用价值是直接利用价值的12倍。新增的生态效益为8002053元,社会效益为2184820元。扣除治理期间实际投入的科研费用,增加的总生态服务净价值为8869308元。

TECHNIQUES OF ECOLOGICAL RESTORATION AND EVALUATION OF ECONOMIC VALUE OF THEIR RESULTS IN GUOHUA DEMONSTRATION AREA

Based on the techniques of soil improvement and exploitation of epikarst water resources,soil and vegetation of Guohua have been restored.Results showed that vegetation density of Guohua went up 50%-70% in 2005 from 10% in 2000.Water and soil loss was also controlled.Soil erosion modulus descended to 510.92 t/(km2·a).Using ecological economic methods,the service value of Guohua ecosystems was evaluated.As a result,the value of indirect use reached RMB10899876, 12 times as much as that of direct use.Ecological benefits were increased by RMB 8715056,social benefits by RMB 2184820.By deducting the actual expenses during restoration of Guohua,the total ecological economic net value was RMB 9582251.