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甘肃省潜在生态承载力估算

潘竟虎*,冯娅娅   

  1. (西北师范大学地理与环境科学学院, 兰州 730070)
  • 出版日期:2017-03-10 发布日期:2017-03-10

Estimating potential ecological carrying capacity in Gansu Province.

PAN Jing-hu*, FENG Ya-ya   

  1. (College of Geographic and Environmental Science, Northwest Normal University, Lanzhou 730070, China).
  • Online:2017-03-10 Published:2017-03-10

摘要: 甘肃省是我国重要的生态屏障,研究其潜在植被生产力的空间格局是生态环境保护和建设的基础性工作。本文在对甘肃省气候要素进行空间化的基础上,利用分类回归树模型计算甘肃省的潜在归一化植被指数(NDVI),采用光能利用率模型(CASA)和潜在NDVI数据对甘肃省的潜在植被净初级生产力(NPP)进行模拟,在此基础上,利用改进的生态足迹法估算了全省14个市州的潜在人均生态承载力。结果表明,甘肃省潜在NDVI和潜在NPP呈现从东南向西北递减的趋势,全省潜在NDVI和潜在NPP的平均值分别为0.277和272.315 g C·m-2。各市州的潜在人均生态承载力呈现南北两头大、中间小的分布格局,甘南州的潜在人均生态承载力最大,为11.616 hm2·人-1,嘉峪关市的潜在人均生态承载力最小,仅为0.228 hm2·人-1

Abstract: Gansu Province is an important ecological barrier in northwest China. The study of spatial pattern of potential vegetation productivity has become basic work toward the ecological environment rehabilitation and reconstruction in arid and semiarid areas of northwest China. Data from some meteorological stations were used to build climate models, and regression trees were applied for estimating potential NDVI based on climate variables and training data of actual NDVI. Then, potential NPP of Gansu Province was simulated by using CASA model and potential NDVI data. On this basis, potential ecological carrying capacity of 14 municipalities in Gansu Province was estimated using the improved ecological footprint approach. Results indicated that potential NDVI and potential NPP decreased from southeast to northwest in Gansu Province. The average potential NDVI and potential NPP of Gansu Province were 0.277 and 272.315 g C·m-2, respectively. The potential ecological carrying capacity per capita (PECC) of the 14 municipalities in Gansu Province presented a distribution pattern of “big at both ends (south and north) but small in the middle”. Gannan Prefecture had the largest PECC, which was 11.616 hm2 per capita, while Jiayuguan City had the least PECC, with only 0.228 hm2 per capita.