A landscape-scale assessment of steppe degradation in the Xilin River Basin, Inner Mongolia, China
A landscape-scale assessment of steppe degradation in the Xilin River Basin, Inner Mongolia, China
复制标题
内蒙古锡林河流域草原退化景观尺度评估
DOI：
10.1016/j.jaridenv.2004.01.004
复制
发表时间：
2004-10-01
影响因子：
2.7
通讯作者：
Yong, W
中科院分区：
文献类型：
--
作者：
Tong, C;Wu, J;Yong, W
草原退化是中国内蒙古草原地区的一个主要生态和经济问题，因为它降低了草原生产力并导致荒漠化。本研究的目的是采用景观尺度方法评估内蒙古锡林河流域草原退化的空间范围和严重程度。我们的方法结合了现场调查记录、现有植被地图和遥感数据的信息，以确定局部尺度上不同草原群落的不同程度的退化及其在景观尺度上的空间格局。我们还开发了草原退化指数（SDI），整合了草原退化的空间范围和严重程度的信息。结果表明，该地区退化草原总面积从1985年的7191.3 km(2)增加到1999年的7689.3 km(2)（占流域总面积的72%）。我们利用SDI量化了退化程度及其时空变化。 SDI 地图显示，草原退化的大范围模式与地貌类型有关。 1985年和1999年，四种地貌的退化程度依次为：低山>熔岩台地>丘陵>高地平原。确定了锡林河流域几个严重退化地区。本研究论证了遥感数据与天气生态指数相结合评估生态系统退化的有效性，为改善内蒙古锡林河流域草原管理实践和恢复退化草原植被提供有用信息。 (C) 2004 年，爱思唯尔有限公司出版。
Steppe degradation is a major ecological and economic problem in the Inner Mongolia steppe region, China because it reduces grassland productivity and leads to desertification. The objective of this Study was to assess the spatial extent and severity of steppe degradation in the Xilin River Basin, Inner Mongolia using a landscape-scale approach. Our approach combined information from field survey records, existing vegetation maps, and remote sensing data to determine the different degrees of degradation for diverse steppe communities at the local scale and their spatial pattern at the landscape scale. We also developed a steppe degradation index (SDI) that integrates the information on the spatial extent and severity of steppe degradation. Our results showed that the total area of degraded steppe in this region increased from 7191.3 km(2) in 1985 to 7689.3 km(2) (72% of the total basin) in 1999. We used SDI to quantify the degree of degradation and its changes in space and time. The SDI maps revealed that large-scale patterns of steppe degradation were related to landform types. For both 1985 and 1999, the four landforms exhibited increasing degrees of degradation in the following order: low mountains > lava tablelands > hills > high plains. Several seriously degraded regions in the Xilin River Basin were identified. This study demonstrates the effectiveness of combining remote sensing data and synoptic ecological indices in assessing ecosystem degradation, and provides useful information for improving grassland management practices and restoring the degraded steppe vegetation in the Xilin River Basin, Inner Mongolia. (C) 2004 Published by Elsevier Ltd.