摘要
通过植被覆盖度变化所反映的生态环境改善或退化,以认识区域生态环境的演变特征。以都柳江流域为研究区,基于MODIS-NDVI产品数据,利用像元二分模型计算流域植被覆盖度状况;通过趋势分析、距平百分率及变异系数分析22年来流域植被覆盖度变化趋势、波动及异常情况。结果表明:(1)都柳江流域植被覆盖度整体为较高覆盖度及高覆盖度,植被覆盖度良好且季节分布特征显著;(2)植被覆盖度变化趋势主要以增加趋势为主,夏季变化趋势与年际变化趋势相似度高,春季则与冬季变化趋势相似;(3)22年来流域年植被覆盖度大多处于正常状态,正常状态占比在年数据上体现比较稳定,春季和冬季异常状态偏多,植被覆盖度在不同年份相同季节的变化异常相对不同年份的年数据更加显著;(4)2000—2021年年植被覆盖度整体呈现稳定的状态,但冬季和春季植被覆盖度相对较不稳定,波动情况较夏季和秋季显著,时空变化上年际和夏季分布情况较一致。
Changes in vegetation coverage can reflect the improvement or degradation of the ecological environment,so as to help identify the evolution characteristics of the regional ecological environment.This paper takes the Duliu River Basin as the research area and calculates the vegetation coverage condition of the basin by using a pixel binary model based on MODIS-NDVI product data.The changing trend,fluctuations,and abnormal conditions of the vegetation coverage of the basin over the past 22 years are analyzed through the analyses of the trend,the anomalous percentage,and the coefficient of variation.The results indicate that①the vegetation coverage in the Duliu River Basin is generally higher or high,with excellent performance and significant seasonal distribution characteristics;②the vegetation coverage is mainly increasing,and the similarity between summer and interannual changes is high,while the changing trend between spring and winter is similar;③for the past 22 years,the annual vegetation coverage of the basin has mostly been in a normal state,with a relatively stable proportion in annual data.There are more abnormal states in spring and winter.The abnormal changes in vegetation coverage in the same season of different years are more significant compared with the annual data of different years;④from 2000 to 2021,the overall vegetation coverage shows a stable state.However,the vegetation coverage in winter and spring is relatively unstable,and the fluctuation in winter and spring is more significant than that in summer and autumn.The interannual and summer distribution patterns are relatively consistent in terms of spatiotemporal changes.
作者
翟香
赵青松
ZHAI Xiang;ZHAO Qingsong(Guizhou Lvxing Qingyuan Environmental Protection Co.,Ltd,Guiyang 550001,China)
出处
《人民珠江》
2024年第3期109-119,137,共12页
Pearl River
关键词
植被覆盖度
变化趋势
异常情况
演变特征
都柳江流域
vegetation coverage
changing trend
abnormal situation
evolution characteristics
Duliu River Basin
