干旱区研究

干旱区研究 ›› 2016, Vol. 33 ›› Issue (1): 150-158.doi: 10.13866/j.azr.2016.01.19

• 植物生态 • 上一篇    下一篇

近12 a三江源地区植被物候对水热的响应

李强1,2   

  1. 1.陕西师范大学旅游与环境学院,陕西 西安 710119;
    2.陕西学前师范学院环境与资源管理系,陕西 西安 710100
  • 收稿日期:2014-04-18 修回日期:2014-11-21 出版日期:2016-01-15 发布日期:2016-01-29
  • 作者简介:李强(1980-),男,副教授,主要研究方向为资源环境遥感与GIS.E-mail: liqiangis@163.com
  • 基金资助:
    国家自然基金青年科学基金项目“基于过程的陕北能源富集区土地利用转型与时空配置研究”(41301618);陕西省社会科学基金项目“陕西能源富集区土地开发利用与生态安全评价”(13D019);陕西省教育厅科学研究计划项目“陕北能源富集区土地资源利用与优化配置研究”(2013JK0851);陕西师范大学中央高校基本科研业务费专项资金“基于MATLAB的时间序列地理栅格数据智能化处理”(GK201404005);2015年度陕西省青年科技新星计划项目“基于GIS的陕北能源富集区土地利用与生态效应评价”(2015KJXX-45)资助

Phenology Response of Vegetation to Hydrothermal Condition in Three-river Source Region for the Last 12 Years

LI Qiang1,2   

  1. 1. College of Tourism and Environment, Shaanxi Normal University, Xi'an 710119, Shaanxi,China;
    2. Department of Environment Resources, Shaanxi Xueqian Normal University, Xi'an 710100, Shaanxi,China
  • Received:2014-04-18 Revised:2014-11-21 Published:2016-01-15 Online:2016-01-29

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被引次数

5

摘要： 基于1999—2010年SPOT VEGETATION旬值NDVI数据,结合谐波分析法与偏相关分析等方法,对三江源地区年植被物候特征值进行了确定,并分析了年际物候对不同时段水热变化的响应。结果表明:① 三江源地区响应时段累积降水量和气温的增加都会使植物生长季始期推迟。② 三江源地区植物生长季末期与累积降水和气温的最值偏相关系数分别为0.180 6和-0.067 8,说明响应时段累积降水量的增加会使植物生长季末期推迟,而累积气温的升高会使植物生长季末期提前,但累积气温影响相对较小。而响应时段累积降水量的增加,会使植物生长季长度延长;累积气温的升高,会使植物生长季长度缩短。③ 三江源地区植物生长季长度的年际变化,受生长季末期的影响较大。④ 三江源地区植物生长季始期主要受前一年累积气候要素影响强烈;生长季末期主要受生长季内累积降水影响强烈。生长季长度受生长季之前的累积气温的作用强烈。

关键词: 植被, 物候, 水热条件, 生长季, 谐波分析, 傅里叶插值, 三江源地区

Abstract: Using methods of harmonic analysis and partial correlation analysis,based on the SPOT-VEGETATION NDVI of 10 days during the period from 1999 to 2010,we identified the beginning and end time of vegetation growing season for each year in the Three-River source region, and analyzed the temporal and spatial relation between vegetation phenology and cumulative hydrothermal at different times. Results are shown as follows:① The increase of cumulative precipitation and temperature of response time makes start of growing season delayed.② The extremum of partial correlation coefficient between end of growing season and cumulative precipitation and temperature is 0.180 6 and -0.067 8,respectively.It shows that the increase of cumulative precipitation of response time make end of growing season delayed,but end of growing season shift to an earlier date with less impact due to the rise of cumulative temperature.Length of growing season extends and shortens because of the increase of cumulative precipitation and temperature of response time,separately.③ The end of growing season change greatly impacts the annual variation of growing season length. ④ The start of growing season mainly reflect cumulative hydrothermal of the previous year, but the cumulative precipitation of growing season worked powerfully upon the end of growing season.For the growing season length,cumulative temperature before the growing season is the most influential factor.

Key words: vegetation, phenology, hydrothermal condition, growing season, harmonic analysis, fourier interpolation, three-river source region