羌塘地区草食性野生动物的生态服务价值评估——以藏羚羊为例

Assessing ecological services value of herbivorous wild animals in Changtang grassland:a case study of Tibetan antelope

随着羌塘草原野生动物种群规模的扩大,草食性野生动物与家畜争夺草场的矛盾愈来愈突出。生态补偿无疑是解决这一矛盾的重要途径之一,而进行野生动物的生态服务价值评估是建立生态补偿标准的基础。通过羌塘地区社会经济资源环境现状调查和人群支付意愿调查,并采用直接市场法和虚拟市场法,对西藏自治区羌塘地区草食性野生动物藏羚羊的生态经济价值进行了评估。把藏羚羊的生态经济价值分为利用价值包括商业价值、游憩娱乐价值、维持生物多样性的价值、教育美学价值和科学研究价值,以及非利用价值包括存在价值、遗产价值、选择价值两大类。对野生动物生态价值的评估结果表明,羌塘地区藏羚羊的生态服务价值高达7.51亿元/a。其中,藏羚羊的利用价值为6.35亿元/a,非利用价值为1.16亿元/a。也就是说,羌塘地区15万只藏羚羊每年产生的生态服务价值远高于羌塘自然保护区涉及的6个县域2007年的总产值4.79亿元。

With increasing population of the wild animals,conflict between the herbivorous wild animals（such as Tibetan Antelope,Kiangs,and Wild Yaks） and domestic animals for limited grassland resources is becoming increasingly significant in Changtang grassland of Tibet Autonomous Region.The ecological compensation scheme has been considered as one of the important approaches to deal with such problems.Therefore,assessment of the ecological value of wild animals could provide the basis for setting up ecological compensation standard. In this research,we have collected relevant second data including statistics and documents to know current socio-economic conditions of the region,In 2008,a questionnaire survey concerning the protection of ecological environment was conducted among 115 full time government employees in Lasa and Nagqu and among 84 herdsmen in Nyima and Shuanghu Zone.Altogether 199 copies of the questionnaires have been distributed and completed,with 198 valid ones.Key questions designed include the willingness to pay for the protection of wild animals in Changtang area,which late were used for estimation of the non-use values. In this paper we established the valuation system and methodologies for the assessment of ecological service value of the wild animals in Changtang grassland.The Tibetan antelope has been taken as indicative wild animal for the assessment.The value system consists of use value and non-use value.Use value includes direct use value（commercial value and recreational entertainment value） and indirect use value（ecological value,cultural and educational value,and aesthetic value,and scientific research value）.Non-use value includes existence value,choice value,and heritage value.We estimated the use value mainly through market valuation method and non use value using the contingent valuation method. As there is no market trading for wild animals,so for no corresponding pricing system for valuing the wild animals.In this paper,we have used standard sheep units as the basis forassessment of animal carrying capacity of grasslands of China,and then converted other herbivorous animals such as horses,donkeys,and cows into standard sheep units,in order to facilitate the calculation.The standard sheep unit refers to a sheep that consumes 1.8 kg of hays per day.Based on the definition,we have converted Tibetan antelopes and Kiangs into standard sheep units accordingly.The sheep unit in the calculation of animal carrying capacity is defined as the adult female sheep that weighs 50 kg and consumes 1.8 kg of hays per day.The average weight of a male Tibetan antelope is 40 kg,and 24 to 28 kg for female Tibetan antelope.Judging from the weights,the amount of hays consumed by a Tibetan antelope is smaller than that of a standard sheep unit.Therefore,one Tibetan antelope equals to 0.8 sheep unit,one Kiang equals to 6 standard sheep units,and one Wild Yak equals to 8 standard sheep units. The valuation results show that the total value of the Tibetan antelopes reached 0.751 billion RMB per year,in which the direct use value is about 0.635 billion RMB per year and non-use value 0.116 billion RMB per year.Apparently,the ecological service value of the Tibetan antelopes in Changtang grassland is higher than 0.479 billion RMB-the gross regional product of all the six counties in the Changtang Nature Reserve in 2007.