img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索

冰川冻土 ›› 2018, Vol. 40 ›› Issue (3): 616-624.doi: 10.7522/j.issn.1000-0240.2018.0067

• 寒旱区生物学 • 上一篇    下一篇

定量评估我国西北干旱区土地利用变化对植被指数的影响

姜雨青1, 李宝富1,2, 宋美帅1, 焦建飞1, 刘纹青1   

  1. 1. 曲阜师范大学 地理与旅游学院, 山东 日照 276826;
    2. 中国科学院 新疆生态与地理研究所 荒漠与绿洲生态国家重点实验室, 新疆 乌鲁木齐 830011
  • 收稿日期:2017-06-29 修回日期:2017-12-30 出版日期:2018-06-25 发布日期:2018-07-16
  • 通讯作者: 李宝富,E-mail:lenny006@163.com E-mail:lenny006@163.com
  • 作者简介:姜雨青(1994-),女,山东临沂人,2018年在曲阜师范大学获学士学位,现为上海海洋大学在读硕士研究生,从事土地利用变化及其影响研究.E-mail:1169812666@qq.com
  • 基金资助:
    国家自然科学基金项目(41501211)资助

Quantitative assessment of land use change impacting the vegetation index in the arid regions of Northwest China

JIANG Yuqing1, LI Baofu1,2, SONG Meishuai1, JIAO Jianfei1, LIU Wenqing1   

  1. 1. College of Geography and Tourism, Qufu Normal University, Rizhao 276826, Shandong, China;
    2. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institue of Ecology and Geography, Chinese Academy of Sciences, Vrümqi 830011, China
  • Received:2017-06-29 Revised:2017-12-30 Online:2018-06-25 Published:2018-07-16

摘要: 在全球变化的背景下,定量区分人类活动和气候波动对干旱区植被的影响具有重要意义。采用多种统计学方法,分析了我国西北干旱区1990-2010年土地利用/覆被变化(LUCC)和1982-2010年归一化植被指数(NDVI)的时空变化特征,并定量评估了LUCC对NDVI变化的影响。结果表明:1990-2010年,西北干旱区耕地增加量最多,高达13 476 km2,其次是林地和水域,各地类增加的面积主要来自草地(12 590 km2)和未利用地(6 025 km2)。各土地类型变化速度快慢依次为:耕地 > 建设用地 > 水域 > 林地 > 草地 > 未利用地。2000-2010年,研究区土地利用程度综合指数(0.79)明显高于1990-2000年(0.23),表明近年来人类活动对土地利用变化的影响程度显著增强。1982-2010年,西北干旱区NDVI呈增加态势,但近年来(2002-2010年)NDVI略有下降。其中,1990-2000年,LUCC对西北干旱区NDVI总变化的贡献率较低,仅为2.9%;而1990-2010,LUCC的贡献率为26.7%,表明气候变化对植被指数变化的贡献率高达73.3%。

关键词: 土地利用变化, 植被指数, 生态效应, 西北干旱区

Abstract: Under the background of global change, distinguishing the impact of human activities and climate fluctuation quantitatively is of great significance to vegetation growth in the arid regions. In this paper, using a variety of statistical methods, the spatial and temporal variation characteristics of the land use/cover change (LUCC) from 1990 through 2010 and the normalized difference index (NDVI) from 1982 through 2010 in the arid regions of Northwest China are analyzed, and the LUCC effects on NDCC change are quantitatively evaluated. The results are as follows:(1) One of the fastest growth was arable land, up to 13 476 km2, followed by forest lands and waters; the area increased mainly from grassplot (12 590 km2) and unused land (6 025 km2) from 1990 to 2000. (2) The rate of change of various land types were as follows:arable land > construction land > waters > woodland > grassplot > unused land. (3) The land-using degree index (0.79) in the study area from 2000 to 2010 was significantly higher than it from 1990 to 2000 (0.23), showing that the influence of human activities on land use has markedly enhanced in recent years. (4) The NDVI had increased from 1982 to 2010, but in recent years (2002-2010) it had decreased slightly. Specifically, the contribution of LUCC on NDVI had been relatively low from 1990 to 2000, only 2.9%; even so, the contribution from 1990 to 2010 had been 26.7%, showing the contribution of climate change on vegetation index change up to 73.3%.

Key words: land use change, vegetation index, ecological effects, the arid regions in Northwest China

中图分类号: 

  • Q948.1