中国桂西北喀斯特生态系统服务价值的时空变化及其与环境因子的相关性。

Spatiotemporal variation of karst ecosystem service values and its correlation with environmental factors in northwest Guangxi, China.

机构信息

Key Laboratory for Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, China.

出版信息

Environ Manage. 2011 Nov;48(5):933-44. doi: 10.1007/s00267-011-9735-z. Epub 2011 Aug 24.

DOI:10.1007/s00267-011-9735-z

PMID:21863372

Abstract

In this investigation we analyzed the spatiotemporal variation of ecosystem service values (ESVs) and its correlation with numerous environmental factors (EFs) for the karst region of Northwest Guangxi, China, from 1985 to 2005 using remote sensing, geographic information systems (GIS) and statistical techniques. The results indicate that historically ESVs for this karst region decreased from 1985 (109.652 billion yuan) to 1990 (88.789 billion yuan) and then increased at the turn of the twenty-first century. However, the ESVs in both 2000 (103.384 billion yuan) and 2005 (106.257 billion yuan) never achieved the level recorded in 1985. The total of nutrient cycling, organic production and gas regulation combined were 72.69, 64.57, 70.18 and 72.10% of ESVs in 1985, 1990, 2000 and 2005, respectively. In contrast, the ESVs of water conservation, soil reservation, recreation and culture were determined to be relatively low contributing only 17.44, 23.82, 19.26 and 24.76% of total ESVs, respectively, during these four years. With regards to the spatial distribution of ESVs, larger values were recorded in the west and smaller ones recorded in the east. The most significant factors that were deemed to influence ESVs are annual rainfall, per capita cropland, slope and vegetation coverage. Annual rainfall and slope exert a negative force, whereas per capita cropland and vegetation coverage exert a positive force on ESVs. The results of the study would suggest that ecosystem conditions of this important karst region have been improved as the result of the implementation of rocky desertification control policies.

摘要

在本研究中，我们利用遥感、地理信息系统（GIS）和统计技术，分析了 1985 年至 2005 年期间中国桂西北喀斯特地区生态系统服务价值（ESV）的时空变化及其与众多环境因素（EFs）的相关性。结果表明，该喀斯特地区的 ESV 历史上从 1985 年（1096.52 亿元）下降到 1990 年（887.89 亿元），然后在 21 世纪之交有所增加。然而，2000 年（1033.84 亿元）和 2005 年（1062.57 亿元）的 ESV 从未达到 1985 年的水平。养分循环、有机生产和气体调节的总和分别占 1985 年、1990 年、2000 年和 2005 年 ESV 的 72.69%、64.57%、70.18%和 72.10%。相比之下，在这四年中，水涵养、土壤保持、娱乐和文化的 ESV 被认为相对较低，仅分别占总 ESV 的 17.44%、23.82%、19.26%和 24.76%。就 ESV 的空间分布而言，西部的数值较大，东部的数值较小。被认为对 ESV 影响最大的因素是年降雨量、人均耕地、坡度和植被覆盖度。年降雨量和坡度对 ESV 产生负向影响，而人均耕地和植被覆盖度对 ESV 产生正向影响。研究结果表明，由于实施了石漠化治理政策，该重要喀斯特地区的生态系统状况得到了改善。