新疆农业科学 ›› 2019, Vol. 56 ›› Issue (10): 1895-1903.DOI: 10.6048/j.issn.1001-4330.2019.10.015

• 土壤肥料·微生物·植物保护·农产品加工·农业经济 • 上一篇    下一篇

基于Landsat影像稀疏植被斑块格局对降水响应

李娜, 王新军, 常梦迪, 闫立男, 徐晓龙   

  1. 新疆农业大学草业与环境科学学院,乌鲁木齐 830052
  • 收稿日期:2019-09-30 发布日期:2019-11-22
  • 通信作者: 王新军(1980-),男,副教授,研究方向为景观生态及生态遥感,(E-mail)wxj8112@163.com
  • 作者简介:李娜(1992-),女,硕士研究生,研究方向为生态遥感,(E-mail)1162326631@qq.com
  • 基金资助:
    国家自然科学基金“古尔班通古特沙漠稀疏固沙植被NPP对水热条件变化的响应”(41761085);国家自然科学基金“古尔班通古特沙漠南缘固沙植被斑块格局对降水脉动的响应研究”(41301205)

Response of Sparse Vegetation Patch Pattern to Precipitation Based on Landsat Image

LI Na, WANG Xin-jun, CHANG Meng-di, YAN Li-nan, XU Xiao-long   

  1. College of Pratacultural and Environmental Sciences,Xinjiang Agricultural University, Urumqi 830052, China
  • Received:2019-09-30 Published:2019-11-22
  • Correspondence author: WANG Xin-jun(1980-),mate,associate professor,(E-mail)wxj8112@163.com

摘要: 【目的】古尔班通古特沙漠稀疏植被斑块格局是水分稀缺的荒漠区对降水在地表的表现。【方法】基于年降水量变化特征,选择1990年TM影像、2001年ETM+、2010年TM影像和2015年OLI遥感影像为数据源,结合1990~2015年蔡家湖气象站逐年的降水数据,计算古尔班通古特沙漠南缘的植被盖度、斑块面积、斑块数量、斑块密度,分析不同植被盖度、面积变化趋势,探讨年降水量对植被盖度、斑块面积、数量、密度的影响。【结果】1990~2015年,植被盖度总体呈减少趋势,其中二级植被面积明显增加(1 089.557 km2),增幅为20.154%,一、三、四级植被面积略有减少,减幅分别为-98.752%、-61.581%、-96.889%。随着降水量的增加,斑块数量,密度增加,破碎程度变小,植被盖度增加。【结论】1990~2015年古尔班通古特沙漠南缘稀疏植被盖度随年降水的变化总体呈退化-好转-退化趋势。年降水量变化与稀疏植被盖度、斑块面积、数量、密度均呈正相关关系。

关键词: 植被盖度; 降水; 斑块格局; 归一化植被指数

Abstract: 【Objective】 To study the impact of precipitation in the Gurbantunggut desert on sparse vegetation patch pattern.【Method】 Based on the change of the annual precipitation, the TM image in 1990, the ETM + in 2001, the TM image in 2010 and the OLI remote sensing image in 2015 were selected as the data sources, and the vegetation coverage, the area of the patch and the number of the patches of the southern margin of the Gurbanton Desert were calculated by combining the yearly precipitation data of the Caijiahu meteorological station from 1990 to 2015. The effects of annual precipitation on the coverage of vegetation, area, quantity and density of vegetation were discussed.【Result】 From 1990 to 2015, the vegetation coverage showed a decreasing trend. The area of secondary vegetation increased significantly (1,089.557 km2), with an increase of 20.154%. The vegetation area of Grade I, III and IV decreased slightly, with a decrease of -98.752%. -61.581%, and -96.889%. With the increase of precipitation, the number and density of patches increased, the degree of fragmentation became smaller, and the area of vegetation coverage increased.【Conclusion】 From 1990 to 2015, the sparse vegetation coverage in the southern margin of the Gurbantunggut Desert showed a trend of degradation-improvement-degradation depending on the each year's precipitation. The yearly precipitation changes were positively correlated with sparse vegetation coverage, patch area, number, and density.

Key words: vegetation coverage; precipitation; patch pattern; normalized vegetation index

中图分类号: 


ISSN 1001-4330 CN 65-1097/S
邮发代号:58-18
国外代号:BM3342
主管:新疆农业科学院
主办:新疆农业科学院 新疆农业大学 新疆农学会

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