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投稿e-mail: jbnuns_sub@bnu.edu.cn

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标题

冻土退化过程中植被覆盖度的变化研究

作者

冯雨晴 梁四海 吴青柏 陈建伟 田鑫 吴盼

机构

中国地质大学(北京)水资源与环境学院; 中国科学院寒区旱区环境与工程研究所; 河南省地矿局第四地质勘察院

摘要

在全球气候变暖的背景下,青藏高原的多年冻土出现了不断退化的现象.退化的多年冻土隔水作用减弱或消 失,并导致依赖于冻结层上水的植被变化.在模拟高原多年冻土分布的基础上,分析了冻土的退化过程植被覆盖度的变化,结果表明,冻土的变化可分为3个阶段:冻土稳定段(80 年代)、冻土快速退化段(90年代)和冻土缓慢退化段(最近十几年).同时,采用GIMMS (globalinventory modeling and mapping studies)第3代NDVI数据 (1982—2012年)分析青藏高原植被覆盖度的斜率变化特征,结果显示:在近31年来,青藏高原的植被覆盖度斜率整体上呈微弱增加趋势;植被覆盖在冻土退化的3 个时段内的变化特征为: 从20世纪80年代冻土相对稳定期到90年代的冻土退化期,比退化面积增大11 % ;近十几年来,冻土退化逐步减缓,植被退化的增幅减弱,面积比90年代增大了3% ,但退化的区域更为集中.冻土退化与植被的变化机制复杂,本文的分析与发现对理解冻土对生态的影响有一定的意义

关键词

青藏高原; 冻土退化; 植被; 斜率

引用

冯雨晴 梁四海 吴青柏 陈建伟 田鑫 吴盼. 冻土退化过程中植被覆盖度的变化研究.[J]. 北京师范大学学报(自然科学版),2016,52(3):311-316.

基金

国家自然科学基金资助项目(41330634, 91125011, 41072191); 中央高校基本科研业务专项资金资助项目

分类号

P642.12

DOI

10.16360/j.cnki.jbnuns.2016.03.010

Title

Vegetation responses to permafrost degradation in the Qinghai-Tibetan Plateau

Author

FENG Yuqing, LIANG Sihai, WU Qingbai, CHEN Jianwei, TIAN Xin, WU Pan

Affiliations

SchooI of Water Resources and Environment, China University of Geosciences(Beijing); The cold and Arid Regions Environmental Engineering Research Institute. Chinese Academy of Sciences (CAS); The 4th Institute Of Geological & Mineral Surrey Of Henan

Abstract

Due to global warming, permafrost in the Qinghai-Tibetan Plateau degenerates continuously. Permafrost degradation has weakened or even taken away the impermeable effect, leading to changes in plants on suprapermafrost water. The distribution of permafrost in the Qinghai-Tibetan Plateau was simulated, and changes in vegetation coverage during permafrost degradation Were analyzed. permafrost changes could be divided into three phases: stabilization (1980s) , fast degradation (1990s) , s ow degradation ( last decade). Variation in slope coefficient of vegetation coverage in the Qinghai-Tibetan Plateau was ana yzed with 3rd NOVI data ( 1982—2012 ) of GIMMS ( global inventory monitoring and modeling studies). Slope coefficient of vegetation coverage in the Qinghai-Tibetan Plateau was found to increase slightly in the ast 31 years. The area with increased coverage occupies 57% of the entire region, except for the degradation trend in southeast or in Qaida basin. Variation in vegetation coverage in 3 phases of permafrost degradation is as follows. In the 1980s, permafrost was relatively steady, only Of vegetation was in degraded state. Forty one percent (41%) Of vegetation coverage (11% marc than that in the 1980s) is in degraded state, when temperature increased universally and permafrost depredated in large scale in the 1990s. In the recent decade, permafrost degradation has gradually slowed down. The spread Of vegetation degradation has also weakened, With an area Of more than in the 1990s, the areas have also become more concentrated. The mechanism of change in permafrost and vegetation degradation is complicated. Analysis and discovery in this study are significance for understanding permafrost impact On ecological system.

Key words

Qinghai-Tibetan Plateau; permafrost degradation; vegetation; slope

cite

FENG Yuqing, LIANG Sihai, WU Qingbai, CHEN Jianwei, TIAN Xin, WU Pan. Vegetation responses to permafrost degradation in the Qinghai-Tibetan Plateau [J]. Journal of Beijing Normal University (Natural Science), 2016,52(3):303-310.

DOI

10.16360/j.cnki.jbnuns.2016.03.010

Copyright © 2014 Journal of Beijing Normal University (Natural Science)
Designed by Mr. Sun Chumin. Email: cmsun@mail.bnu.edu.cn