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2000—2016年宁夏植被覆盖度的时空变化及其驱动力

黄悦悦,杨东*,冯磊   

  1. (西北师范大学地理与环境科学学院, 兰州 730070)
  • 出版日期:2019-08-10 发布日期:2019-08-10

Spatiotemporal variation in vegetation coverage and its driving forces in Ningxia during 2000-2016.

HUANG Yue-yue, YANG Dong*, FENG Lei   

  1. (College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China).
  • Online:2019-08-10 Published:2019-08-10

摘要: 基于MODIS NDVI遥感数据及同期的气象数据,采用趋势分析、变异系数及Hurst指数等方法反演了2000—2016年宁夏地区植被的动态变化特征。结果表明:宁夏地表植被覆盖总体为增加趋势,呈现显著的地域性特征,南北差异很大。植被年际变化受自然和人为的影响具有明显的阶段特征,2000—2016年整体为增长趋势,2000—2005和2006—2011年间增长显著,2012—2016年植被退化,降水量和湿润指数对植被生长的响应最为显著。生长季植被显著增加的面积占79.88%,春、夏、秋季NDVI分别以0.026·10 a-1、0.07·10 a-1和0.049·10 a-1的速率增加。宁夏大部分地区植被变化将保持现有的生长趋势,但局部将有反持续性的变化,62.13%的植被NDVI呈现持续改善的趋势,且南部林区持续改善的面积大于北部引黄灌区。

关键词: 森林土壤, 甲硫氨基酸, 土壤水分, 硝化作用, 氧化亚氮

Abstract: Based on MODIS NDVI remote sensing and contemporaneous weather data, we used trend analysis, coefficient of variation and Hurst index to investigate the dynamics of vegetation coverage in Ningxia from 2000 to 2016. The vegetation coverage showed an overall increasing trend over time, with a large difference between north and south. NDVI increased significantly from 2000 to 2005, relatively slowly increased from 2006 to 2011, and slightly decreased from 2012 to 2016. Precipitation and humidity index showed the greatest response to vegetation growth. In the growing season, NDVI showed an overall rising trend, with 79.88% of the study region showing significant increase in NDVI. Seasonal NDVI increased at a rate of 0.026·10 a-1,0.07·10 a-1 and 0.049·10 a-1 in spring, summer and autumn respectively, during 2000-2016. Although the vegetation coverage in 62.13% of the vegetationcovered area continued to increase, some regions exhibited decreasing vegetation coverage. The continued improved area in vegetation coverage in southern forest area was larger than that in northern irrigation area around the Yellow River.

Key words: forest soil, Lmethionine, soil water, nitrification, nitrous oxide.