草业科学2018，Vol.35Issue(4)：713-725,13.DOI:10.11829/j.issn.1001-0629.2017-0387
基于GIMMS NDVI 3g.v1的近34年青海省植被生长季NDVI时空变化特征
Spatial-temporal variations in NDVI in vegetation-growing season in Qinghai based on GIMMS NDVI 3g.v1 in past 34 years
摘要
Abstract
Under the influence of climate change and human activities,the ecological environment in Qinghai Province has changed markedly.In this context,taking GIMMS NDVI3g.v1 as the data source,we analyzed temporal and spatial changes in NDVI of the vegetation coverage area in Qinghai Province from 1982 to 2015, using the Theil-Sen Median trend analysis and Maan-Kendall test.Both the trend analysis and R S analysis were superimposed to study the persistent characteristics of NDVI change during the vegetation growth season, and reveal the regularity of vegetation response to climate change and human activities.The results showed that:1)Vegetation NDVI in Qinghai Province increased from the Northwest to Southeast in the past 34 years,and the coefficient of variation indicated that a larger volatility region was concentrated in the lower NDVI re-gion of the Qaidam Basin and northwest of the Qingnan pastoral area;the volatility was concentrated in the eastern part of the Qilian Mountains,eastern agricultural area,and southwest of Qingnan pasture area with high vegetation NDVI.2)In the past 34 years,the overall NDVI of vegetation in Qinghai showed an increasing trend;growth rate was 0.38%?10 a-1,the change in NDVI was obvious in phases,and there were two abrupt changes in 1994 and 2000.3)The area of vegetation improvement in Qinghai Province (75.4%)from 1982 to 2015 was much larger than that of vegetation degradation (24.6%),of which the significant improvement area represented 40.9% of the area covered by vegetation,and the degradation zone showed a significant shift in space over time.4)The Hurst index showed that the reverse trend of vegetation change in Qinghai Province was remarkably persistent;the trend analysis and Hurst index obtained by superposition showed that 13.7% of the area affected by degradation was enhanced from degradation to improvement,and 44.3% of the area from improvement to degradation;future trends of 41.5% of the area could not be determined,and only 0.2%-0.3% of area was between continuous improvement and sustained degradation.5)The NDVI of vegetation growth in Qinghai Province was affected by climate change and human activities,and the response of different vegetation types to climate change was quite different.关键词
GIMMS NDVI 3g.v1/Sen+Mann-Kendall/RS/生长季NDVI/时空变化/变化响应Key words
GIMMS NDVI 3g.v1/Sen+Mann-Kendall/R S/growing-season NDVI/Spatial-temporal varia-tions/change response分类
农业科技引用本文复制引用
代子俊,赵霞,李冠稳,王兴春,庞龙辉..基于GIMMS NDVI 3g.v1的近34年青海省植被生长季NDVI时空变化特征[J].草业科学,2018,35(4):713-725,13.基金项目
青海省科技厅项目(2013-Z-936Q) （2013-Z-936Q）
青海省地理空间信息技术与重点实验室2017年度开放课题(QDXS-2017-03) （QDXS-2017-03）
2016年青海省重点实验室项目 （）
