欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

基于水土保持的甘肃省生态安全评价

李宗杰,田青**,宋玲玲,康飞龙,魏雅倩   

  1. (甘肃农业大学林学院, 兰州 730070)
  • 出版日期:2015-05-10 发布日期:2015-05-10

Evaluation of ecological security based on soil and water conservation in Gansu Province.

LI Zong-jie, TIAN Qing**, SONG Ling-ling, KANG Fei-long, WEI Ya-qian   

  1. (College of Forestry, Gansu Agricultural University, Lanzhou 730070, China)
  • Online:2015-05-10 Published:2015-05-10

摘要:

运用甘肃省统计年鉴、农村年鉴和水土保持公报数据,基于压力-状态-响应(P-S-R)模型,选取12个评价指标,构建生态安全评价体系,对甘肃省进行生态安全的空间评价。结果表明:(1)26年间,研究区3大指标发生了显著的变化,其中:状态指标平均贡献率为30%,响应指标平均贡献率为27.5%,压力指标的变化趋势最明显,对生态安全指数的相对贡献率也最大,平均贡献率达到42.5%;(2)通过对甘肃省3大流域的逐一分析得出,全省的生态安全度由1986年的0.31到2011年的0.67,虽然全省的生态安全度有较大提高,但确保全省生态安全的任务仍然非常艰巨;(3)1986—2011年甘肃省14个市(州)的平均生态安全度为0.36~0.58,整体上研究区的生态安全度处于Ⅲ、Ⅳ等级。其中天水市的生态安全度较高也较稳定,而其他市州应该在当前的基础之上加大环境保护、治理力度,从根本上确保区域的生态安全。
 

关键词: 人工林, 氮储量, 林龄, 碳储量

Abstract:

Using the statistical yearbook, rural yearbook and bulletin of soil and water conservation data in Gansu Province, based on the pressurestateresponse (P-S-R) model, 12 evaluation indexes were selected to construct the ecological security evaluation system and to evaluate spatial ecological safety in Gansu Province. The results showed that: (1) Significant changes had taken place in the three major indexes in the study area in past 26 years. The average contributions of condition indicators, response indicators, and pressure indicators were 30%, 27.5%, and 42.5%, respectively. (2) The ecological safety shifted from 0.31 in 1986 to 0.67 in 2011 based on the analysis of three major river basins. The ecological safety had improved, but the task to guarantee the ecological security is still very arduous. (3) The average ecological safety ranged from 0.36 to 0.58 in 14 cities (prefectures) from 1986 to 2011. The overall ecological safety was at Ⅲ and Ⅳ levels in the whole study area. The ecological safety of Tianshui was higher and relatively stable; however, other regions should strengthen environmental protection based on the current situations, ensuring the regional ecological security.
 

Key words: nitrogen storage, carbon storage, forest age, plantation forest