地球信息科学学报 ›› 2013, Vol. 15 ›› Issue (2): 270-279.doi: 10.3724/SP.J.1047.2013.00270

• 遥感科学与应用技术 • 上一篇    下一篇

10 年来锡林郭勒盟草原植被长势变化及其影响因子分析

于海达, 杨秀春, 徐斌, 金云翔, 高添, 李金亚   

  1. 中国农业科学院农业资源与农业区划研究所, 北京100081
  • 收稿日期:2012-12-21 修回日期:2013-01-18 出版日期:2013-04-25 发布日期:2013-04-18
  • 通讯作者: 杨秀春(1975-),女,副研究员,主要从事草地遥感研究。E-mail:yangxc@caas.net.cn E-mail:yangxc@caas.net.cn
  • 作者简介:于海达(1986-),女,硕士生,主要从事草地遥感研究。E-mail:yuhaida5920@163.com
  • 基金资助:

    国家自然科学基金项目(40701055);国家高技术研究发展计划项目(2006AA10Z242, 2008AA121805)。

Changes of Grassland Vegetation Growth in Xilin Gol League over 10 Years and Analysis on the Influence Factors

YU Haida, YANG Xiuchun, XU Bin, JIN Yunxiang, GAO Tian, LI Jinya   

  1. Institute of Natural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2012-12-21 Revised:2013-01-18 Online:2013-04-25 Published:2013-04-18

摘要: 对草原植被长势变化的监测, 及其与气候因子关系的分析, 对生态环境治理及保护具有重要意义。本文利用250m的MODIS-NDVI 数据, 构建草原植被长势指数(MGI), 分析了16 天间隔的植被长势变化及其与降水、气温的相关性和对降水响应的滞后性。得到锡盟3 种草原类型区2001-2010 年草原长势变化情况, 及降水、气温在草原生长不同阶段对草原长势的影响。研究结果表明:(1)在空间上长势东部变化好于中部与西部, 北部好于南部;时间上2003 年长势最好、2001 年长势最差。(2)锡盟内3 种草原类型区MGI均与降水关系明显, 与气温相关性不显著, 降水对温性草原区长势变化的影响最大。(3)在草原生长的不同阶段, 影响因子不同, 前期与后期主要受气温影响, 中期主要受降水影响, 草原生长对降水存在明显的滞后, 一般在32-48 天, 同时指出草原植被在不同时间段对降水响应的滞后时间。

关键词: 锡林郭勒盟, 长势, 气象因子, 滞后效应

Abstract: Monitoring of grassland vegetation growth is an important part in grassland studies. It is helpful to acquire the grassland situation and has significance to environmental management and protection through analysis on the relationship between vegetation growth and meteorological factors. In this research, we obtained the spatial distribution of temperature and precipitation by using the ANUSPLIN spatial interpolation method and uses 16days, 250m MODIS-NDVI data to build grassland vegetation growth index MGI (modified growth index), get the changes of Xilin Gol League grassland vegetation growth from 2001 to 2010, analyze the relationships between vegetation growth and temperature/precipitation, and reveal the hysteresis effect of precipitation. The results of this research showed: (1) spatially, the vegetation growth in east part is better than in central part and west part, in north part is better than in south part. Growth in 2003 is better than the other years, and 2001 is the worst year. (2) The correlation between MGI and precipitation of the three grasslands in Xilin Gol is significant, but the relation between MGI and temperature is week. Precipitation can explain 57.5% of desert grassland grow, 75.2% of typical steppe grow and 63.7% of meadow prairie grow. So,we can say that vegetation growth performs better with the increase of precipitation. (3) Impact factor is different to grassland vegetation growth in different phrases, temperature limits the growth during early and late stage, precipitation is the main impact factor to growth during middle stage. Grassland vegetation grow has an obvious lag response, about 32-48 days. And we pointed out that lag response time is different in different grow stage, during early stage is 32days, during middle stage is 48days, and during late stage is 32days.

Key words: meteorological factors, hysteresis effect, Xilin Gol League, vegetation growth