阿鲁科尔沁旗植被覆盖度时空变化及气象原因  

Spatiotemporal variation of vegetation coverage and its meteorological causes in Arukhorqin Banner

作　　者：樊雪丰 孙新龙 张迎杰 FAN Xuefeng;SUN Xinlong;ZHANG Yingjie(Chifeng Meteorological Bureau,Chifeng 024000,China)

机构地区：[1]赤峰市气象局,赤峰024000

出　　处：《草原与草业》2024年第1期14-18,共5页Grassland and Prataculture

摘　　要：基于2000—2022年MODIS ENVI数据,应用像元二分法计算阿鲁科尔沁旗植被覆盖度,并通过用Theil-Sen趋势分析、Mann-Kendall显著性检验法、变异系数及相关性分析法探究植被覆盖度的时空变化特征及气象原因。结果表明:阿鲁科尔沁旗植被覆盖度多年平均值为63%,呈现“北高南低”的空间分布,并且北部植被覆盖度稳定性更高。2000—2022年阿鲁科尔沁旗植被覆盖度呈波动增加趋势,增幅为0.7%/a,总体呈现从中等覆盖度向中高、高覆盖度转化的趋势。研究区植被覆盖度改善面积占比为88.9%,退化面积占比为11.0%,退化最严重的时间为2009年。日照时数与降水量是影响植被覆盖度的主要气象因子,二者导致的干旱是2009年植被覆盖度退化的主要原因。Based on the MODIS ENVI data from 2000 to 2022,the pixel dichotomy method was applied to calculate the fractional vegetation coverage(FVC)in the Arukhorqin Banner.The Theil-Sen trend analysis,Mann-Kendall significance test,coefficient of variation and correlation analysis were used to explore the spatial and temporal variation characteristics of vegetation coverage and its meteorological influencing factors.The results showed that:the multi-year average vegetation coverage in Arukhorqin Banner was 63%,showing a spatial distribution pattern of high in the north and low in the south,and the vegetation coverage in the north was more stable.From 2000 to 2022,the vegetation coverage showed a fluctuating growth trend,with a growth rate of 0.7%/a,showing a trend of transformation from medium coverage to medium-high and high coverage.The area proportion of vegetation coverage improvement was 88.9%,and the area proportion of vegetation coverage degradation was 11.0%,the most serious degradation occurred in 2009.Sunshine duration and precipitation were the dominant meteorological factors affecting vegetation coverage,and drought caused sunshine duration and precipitation was the main cause of the degradation of vegetation coverage in 2009.

关 键 词：植被覆盖度 像元二分模型 时空变化 

分 类 号：Q948.112[生物学—植物学]