基于MODIS-EVI和CI的洞庭湖流域植被指数对气象干旱的响应

长江流域资源与环境 >> 2019, Vol. 28 >> Issue (04): 981-993.

基于MODIS-EVI和CI的洞庭湖流域植被指数对气象干旱的响应

雷倩¹，章新平^{1, 2*}，王学界¹，贺新光^{1, 2}，尚程鹏¹

(1. 湖南师范大学资源与环境科学学院，湖南长沙 410081；2. 湖南师范大学地理空间大数据挖掘与
应用湖南省重点实验室，湖南长沙 410081)

出版日期:2019-04-20 发布日期:2019-05-09

Responses of Vegetation Index to Meteorological Drought in Dongting Lake Basin Based on MODIS-EVI and CI

LEI Qian¹, ZHANG Xin-ping^1,2, WANG Xue-jie¹, HE Xin-guang^1,2, SHANG Cheng-peng¹

(1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081,China;
2. Key Laboratory of Geospatial Big Data Mining and Application, Hunan Province, Hunan Normal University, Changsha 410081, China)

Online:2019-04-20 Published:2019-05-09

摘要/Abstract

摘要： 基于洞庭湖流域2000~2012年98个气象站点的综合气象干旱指数（CI）和MODIS增强型植被指数（EVI）数据，对研究时段内生长季干旱强度和EVI时空变化特征，典型春、夏、秋季干旱年月和湿润年月干旱强度和EVI的空间分布及相关性进行分析，旨在研究EVI指数能否反映大范围气象干旱事件，探讨该指数作为流域干湿状况度量标准的潜力。结果表明：（1）在年际变化上，EVI在2001、2005、2009年出现低谷值，与其对应年份的干旱强度出现高峰值；在季节变化上，干旱强度的高值段主要集中在夏秋季，低值段主要集中在冬春季；夏季EVI值最大，冬季EVI值最小；（2）去除年际变化和季节性影响的生长季干旱强度、EVI和森林覆盖率年际波动变化明显，并且干旱强度高峰值的年份对应EVI和森林覆盖率出现低值的年份；（3）典型干旱年月干旱强度高值区的空间分布与EVI距平低值区的空间分布存在高度一致性，其中夏、秋季干旱年月的干旱强度和EVI的相关系数分别通过了0.01、0.1的显著性水平检验；（4）除部分地区外，典型春夏秋季湿润年月的干旱强度空间分布与EVI距平的空间分布对应较差，两者的相关系数未通过显著性检验。上述结果表明，在典型干旱年月，流域植被的生长状况能够响应大范围的区域气象干旱情况。

Abstract: Based on the comprehensive meteorological drought index (CI) calculated from 98 meteorological stations and the MODIS enhanced vegetation index (EVI) data from 2000 to 2012 in the Dongting Lake Basin, we analyzed spatial and temporal variations of drought intensity and EVI during growing seasons. We also analyzed spatial distributions of drought intensity and EVI in spring, summer and autumn of typical dry and wet years as well as the correlation between drought intensity and EVI. We aimed to answer the question whether variations in EVI can reveal large-scale meteorological drought events, and to explore the potential of EVI as an indicator of dry and wet conditions in this basin. The results showed that (1) the lowest value of EVI occurred in 2001, 2005 and 2009, while the highest value of drought intensity also appeared in these three years. For drought intensity, high values were mainly distributed in summer and autumn, while low values were present in winter and spring. For EVI, the maximum and minimum values were present in summer and winter, respectively. (2) The drought intensity, EVI and forest coverage that have been corrected for inter-annual and seasonal effects during the growing season showed significant inter-annual fluctuations. The year with high drought intensity was consistent with that with low forest coverage. (3) The spatial distribution of high drought intensity matched well with that of low EVI in typical drought years. The correlation coefficients between drought intensity and EVI in summer and autumn of dry years were statistically significant (P<0.01 and 0.1 for summer and autumn, respectively). (4) The spatial distribution of drought intensity and EVI anomalies did not match in spring, summer and autumn in wet years. No significant correlations were found between drought intensity and EVI anomalies during these time periods. Our results suggested that growth of vegetation can well reflect large-scale meteorological drought in the Dongting Lake Basin.

雷倩, 章新平, 王学界, 贺新光, 尚程鹏. 基于MODIS-EVI和CI的洞庭湖流域植被指数对气象干旱的响应[J]. 长江流域资源与环境, 2019, 28(04): 981-993.

LEI Qian, ZHANG Xin-ping, WANG Xue-jie, HE Xin-guang, SHANG Cheng-peng. Responses of Vegetation Index to Meteorological Drought in Dongting Lake Basin Based on MODIS-EVI and CI[J]. RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2019, 28(04): 981-993.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

推荐阅读 10

[1]	杨琳,何芳,陈天明. 基于弹性理念的城市用地开发战略研究——以上海市宝山区为例[J]. 长江流域资源与环境, 2008, 17(3): 360 .
[2]	许有鹏,于瑞宏,马宗伟. 长江中下游洪水灾害成因及洪水特征模拟分析[J]. 长江流域资源与环境, 2005, 14(5): 638 -643 .
[3]	刘腊美龙天渝李崇明. 三峡水库上游流域非点源颗粒态磷污染负荷研究[J]. 长江流域资源与环境, 2009, 18(4): 320 .
[4]	周国英, 李天才, 徐文华, 孙菁, 马海, 陈桂琛. 多年冻土区工程迹地人工恢复区植物和土壤的矿质元素含量特征[J]. 长江流域资源与环境, 2011, 20(2): 191 .
[5]	潘竟虎. 中国国家森林公园空间可达性测度[J]. 长江流域资源与环境, 2013, 22(8): 1180 .
[6]	杨良杰，吴威，苏勤，杜志鹏，蒋晓威. 江苏省交通运输业能源消费碳排放及脱钩效应[J]. 长江流域资源与环境, 2014, 23(10): 1383 .
[7]	胡振鹏，葛刚，刘成林. 鄱阳湖湿地植被退化原因分析及其预警[J]. 长江流域资源与环境, 2015, 24(03): 381 .
[8]	高东东, 吴勇, 陈盟, 王春红. 贡嘎山森林系统小流域基流分割与降雨入渗补给计算[J]. 长江流域资源与环境, 2015, 24(06): 949 -955 .
[9]	李继洲, 吴海旭, 姜万, 袁旭音, 刘斌武. 南京城区黑臭河道底泥污染特征及生态风险评价[J]. 长江流域资源与环境, 2015, 24(11): 1913 -1919 .
[10]	朱军，李益敏，余艳红. 基于GIS的高原湖泊流域生态安全格局构建及优化研究——以星云湖流域为例[J]. 长江流域资源与环境, 2017, 26(8): 1237 .