干旱区研究2018，Vol.35Issue(2)：346-353,8.DOI:10.13866/j.azr.2018.02.12
祁连山中段植被群落的时空格局变化
Spatiotemporal Distribution Pattern of Vegetation Communities in the Middle Section of the Qilian Mountains
摘要
Abstract
It is a precondition of regenerating ecological environment to fully understand the spatial and temporal distribution pattern of vegetation communities.In this paper, a vegetation classification was carried out based on the LANDSAT images in 4 years of 1976, 1991, 2001 and 2016.The classified results were used to get three landscape indexes, i.e., the mean patch area (MPA), fractal dimension (Fd ) and aggregation index (AI), which were used to analyze the degree and driving forces of vegetation habitat change.Based on the classification for 2001 and 2016, the vegetation distribution in 2031 was predicted by CA-Markov model.The results showed that human activities were the main factors resulting in the change of vegetation communities.The distribution of vegetation communities was changed a lot during the period of 1976-2016, the areas of forests and grasslands were reduced by 91 km2 and 169 km2 respectively.From 1976 to 2001, the MNAs of forests, shrubberies and grasslands were reduced by 1.22 km2, 0.14 km2 and 0.16 km2, the AIs of forests, shrubberies and grasslands were decreased by 2.79, 0.03 and 8.77, and the Fds of forests, shrubberies and grasslands were increased by 0.013, 0.001 and 0.005, respectively. The degree of vegetation community fragmentation was serious.But from 2001 to 2016, the MNAs of forests, shrub-beries and grasslands were enlarged by 0 km2, 0.13 km2 and 0.02 km2, the AIs of forests, shrubberies and grass-lands were increased by 2.38, 0.21 and 6.55, and the Fds of a forests, shrubberies and grasslands were decreased by 0.005, 0.002 and 0.002, respectively.The habitat of vegetation communities was gradually regenerated after 2001.The predicted areas of forests, shrubberies and grasslands in 2031 are 409 km2, 486 km2 and 550 km2 respec-tively, which nearly equaled to those in 1976. A significant effect of ecological conservation policy had been a-chieved.关键词
植被群落/生境破碎化/时空格局/景观指数/祁连山中段Key words
vegetation community/habitat fragmentation/spatial and temporal distribution pattern/landscape index/the Qilian Mountains引用本文复制引用
葛丽娟,党虹,戎战磊,高云飞,赵传燕,王红义..祁连山中段植被群落的时空格局变化[J].干旱区研究,2018,35(2):346-353,8.基金项目
国家自然科学基金集成项目(91425301),兰州大学中央高校基本科研业务费专项资金资助(lzujbky-2017-it09) （91425301）
