Value valuation of the natural grassland ecosystem service function in Guizhou province under the background of rocky desertification

The value evaluation of natural grassland ecosystem has vital significance on the reasonable development and protection of natural grassland in Guizhou, especially on the the biggest ecological problem---rocky desertification. This article makes an evaluation on the function values of natural grassland ecosystem service in Guizhou province, according to ecological value assessment methods proposed by XIE Gao-di, ecological services value equivalency factor table of Chinese terrestrial ecosystemandthesurveyonnatural grass (20hm2)inGuizhouProvince.Theresultsshow that thetotalvalueof ecological services function of natural grassland type in Guizhou is 5.0061×108 dollars per year. The function value of ecological service of hilly grassland accounts for 42.42%of the total value, with 2.1238×108 dollars per year; the function value of ecological service of hilly shrub grassland accounts for 41.08%of the total value, with 2.0567×108 dollars per year; the function value of ecological service of hilly woodland accounts for 14.98%, with 7.5伊107 dollars per year; the function value of ecological service of mountain meadow accounts for 1.51%, with 7.56伊106 dollars per year. Hilly grass and hilly shrub grassland accounts for 83.50%of the total value, and thevalueof ecological serviceofsoil formationandprotectionaccountsfor27.19%,about1.361伊108 peryear.