云南藏区县域农业生态系统能值分析

Analysis of Agricultural Ecological Energy at County Level in Tibetan Areas of Yunnan Province

为了更好地评价云南藏区县域尺度农业对太阳能资源的利用和农业可持续发展状况,以云南香格里拉县为研究区,采用能值分析方法对农业生态系统的能值投入产出、环境承载能力和生态系统运行效果进行了定量分析。结果表明:研究区农业生态系统中净能值产出率为342.66,能值投入率为0.01,能值密度为3.49×1011 sej/m2;人均能值用量为2.32×1016 sej/人,人均能值产出为8.42×1016 sej/人;环境贡献率、可更新资源投入比、不可更新资源投入比和不可更新工业辅助能投入比分别为98.97,97.34,1.63,1.03;环境承载力为0.027;基于能值的可持续发展指数为12 691.11。这说明香格里拉县农业经济较落后,可持续发展能力较弱。为了促进农业经济发展和增强可持续发展能力,应该加大绿色高能质项目投入,尽快调整能值投入结构,加速转变农业发展模式。

In order to better evaluate the situation of solar energy resources utilization and sustainable development of agriculture at county level in Tibetan areas of Yunnan,quantitative analysis of energy input and output,environmental carrying capacity and operation results of agricultural ecological system in Shangri-La County has been carried out by using enrgy analysis method.The results show that the net output of agricultural ecosystems energy of the study area is 342.66,energy input rate is 0.01,energy density is 3.49×1011sej/m2;the mean consumption of energy per capita is 2.32×1016 sej/people,energy yield percapita is 8.42×1016 sej;the environment contribution rate,renewable resource input ratio,nonrenewable resource investment and nonrenewable industrial auxiliary energy investment rate are 98.97,97.34,1.63 and 1.03,respectively;environmental capacity is 0.027;the energy based sustainability development index is 12 691.11.The results also show that agricultural economic development is relative backwardness,and the sustainable development ability is weak.In order to promote agricultural economy and strengthen the agricultural sustainable development ability,Shangri-La County should increase inputs of high grade ability energy,adjust the energy investment structure quickly and accelerate to change agricultural development mode.