Assessment of the eco service value loss in Guizhou karst rocky deserts

Index system suitable for assessment of the eco service value loss in karst rocky deserts is set up in the paper. Six items of key eco value loss in Guizhou karst rocky deserts, involving organic matter production, carbon fixation and oxygen release effect, conservation of water and soil, nutrient substance accumulation and biodiversity protection as well as recreation, are assessed and estimated based on data from the RS, the survey at typical samples and the public records by means of rendering the amount of material into the magnitude of value.The results show that (1)the average value of per unit in different degrees of desertification as that the potential one by 12 483.88 Yuan/(hm2?a), the slight one by 7 425.97 Yuan/（hm2?a）, the middle one by 6 557.83 Yuan/（hm2?a）, the serious one by 4 414.06 Yuan/（hm2?a） and the extremely serious one by 3 755.07 Yuan/（hm2?a）; (2) the total eco service value loss per year is 21.085 billion Yuan/a with the potential one by 0.872 billion Yuan/a, the slight one by 5.943 billion Yuan/a, the middle one by 10.115 billion Yuan/a, the serious one by 4.789 billion Yuan/a and the extremely serious one by 0.566 billion Yuan/a; (3) on spatial distribution, the eco service value losses in all city range from 1.292 to 5.657 billion Yuan/a with the loss amount ordering as Bijie ＞ Qiannan ＞Zhunyi ＞ Southwestern Qianxinan ＞ An’shun ＞ Tongren ＞ Lupanshui ＞ Qiandongnan.