摘要
基于2000—2018年MODIS EVI数据,采用Theil-Sen Median趋势分析法、Mann-Kendall检验和多元线性回归分析,研究甘南州EVI时空变化趋势和影响因素。结果表明,从年际EVI变化来看,2000—2018年甘南州草地生长季植被覆盖度呈先下降再缓慢上升的趋势,EVI均值在0.36~0.41。从空间变化看,盛草期甘南州绝大部分区域植被覆盖度较高且随时间推移而明显改善;部分地区发生了轻微退化现象。具体可以表现为高海拔地区植被退化较明显,而低海拔地区植被有改善的趋势。影响植被变化趋势的主要因素是气候和地形因素,人为因素也有显著影响。
Based on MODIS EVI data from 2000 to 2018,the paper used Theil-Sen Median trend analysis method,Mann-Kendall test and multiple linear regression analysis to study the temporal and spatial trends and influencing factors of EVI in Gannan Prefecture.The results showed that from the perspective of inter-annual EVI changes,during 2000-2018,the vegetation coverage of the grassland growing season in Gannan Prefecture first declined and then slowly increased,and the average EVI fluctuated between 0.36-0.41.From the perspective of spatial changes,the vegetation coverage in most areas of Gannan Prefecture during the heyday of grass was relatively high and it improved significantly with the passage of time;some areas experienced slight degradation.Specifically,it could be expressed that the vegetation degradation in high-altitude areas was more obvious,while the vegetation in low-altitude areas had a trend of improvement.The main factors affecting the vegetation change trend were climate and topography,and human factors also had a significant impact.
作者
马玥
王录仓
MA Yue;WANG Lu-cang(Northwest Normal University,Lanzhou,Gansu 730070)
出处
《安徽农业科学》
CAS
2022年第7期68-72,95,共6页
Journal of Anhui Agricultural Sciences
关键词
甘南州
植被覆盖水平
时空变化
影响因素
Gannan Prefecture
Vegetation coverage level
Temporal and spatial changes
Influencing factors
