西南喀斯特地区与非喀斯特地区气象干旱时空特征及其对植被的影响  

Spatio-temporal patterns of meteorological drought and impact on vegetation in karst region and non-karst region of Southwest China

作　　者：闫妍 莫金宇 靳佳 黄玉清 胡宝清 史莎娜 Yan Yan;Mo Jinyu;Jin Jia;Huang Yuqing;Hu Baoqing;Shi Shana(Key Laboratory of Environment Change and Resources Use in Beibu Gulf,Ministry of Education,Nanning Normal University,Nanning 530001,Guangxi,China;Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation,Nanning 530001,Guangxi,China;Institute of Geography and Oceanography,Nanning Normal University,Nanning 530001,Guangxi,China;School of Geographic Sciences and Planning,Nanning Normal University,Nanning 530001,Guangxi,China)

机构地区：[1]南宁师范大学北部湾环境演变与资源利用教育部重点实验室/广西地表过程与智能模拟重点实验室,广西南宁530001 [2]南宁师范大学地理与海洋研究院,广西南宁530001 [3]南宁师范大学地理科学与规划学院,广西南宁530001

出　　处：《地理科学》2024年第7期1275-1285,共11页Scientia Geographica Sinica

基　　金：国家自然科学基金项目(42061063);广西科技基地和人才专项(桂科AD22035183)资助。

摘　　要：本文基于1982―2020年逐月自校正帕默尔指数(sc_PDSI)及归一化植被指数(NDVI)数据集,使用集合经验模态分解(EEMD)、Mann-Kendall趋势检验和相关性分析等方法对西南喀斯特与非喀斯特地区的干旱时空变化特征进行分析,并在多时间尺度讨论植被对干旱的响应关系。结果表明:①西南喀斯特和非喀斯特地区均呈现“干旱-湿润-干旱”的变化过程,经EEMD分解后,sc_PDSI存在季节、年际和年代际尺度的周期变化规律,其中年际尺度变化占主导地位(方差贡献率最大)。非喀斯特地区和喀斯特地区的sc_PDSI依次在2014年、2015年发生突变,喀斯特地区干旱指数突变发生在非喀斯特地区之后。总体上,喀斯特地区干湿度优于非喀斯特地区。②在西南喀斯特地区,呈现干旱化和显著干旱化的面积比例分别为42.47%和12.75%,均低于非喀斯特地区干旱化(50.69%)和显著干旱化(27.79%)的面积比例。且喀斯特地区显著湿润化的面积比例为48.81%,远高于非喀斯特地区显著湿润化面积36.23%。③在月度、年度和多年尺度上,喀斯特地区和非喀斯特地区植被NDVI与sc_PDSI均呈负相关关系。且随着时间尺度增加,植被NDVI与sc_PDSI之间相关性越大。西南地区78.87%的区域植被NDVI对sc_PDSI的响应存在滞后性。喀斯特地区和非喀斯特地区植被NDVI对sc_PDSI的响应呈现滞后性面积比例分别是76.43%和68.75%,滞后时间尺度分别以1~3个月和3~6个月为主。本文期望为喀斯特地区生态恢复及区域发展提供理论参考和科学依据。Based on the monthly self-correcting Palmer index(sc_PDSI)and normalized difference vegetation index(NDVI)data sets from 1982 to 2020,the ensemble empirical mode decomposition(EEMD),Mann-Kendall trend test and correlation analysis were applied to analyzing the temporal and spatial variation charac-teristics of meteorological drought in karst and non-karst regions of Southwest China.And the response rela-tionship of vegetation to meteorological drought at multiple time scales was discussed.The results are follow-ing.1)Both karst and non-karst regions in Southwest China presented the process of“dry-humid-dry”.There was a cyclical pattern of seasonal,interannual and interdecadal scales in sc_PDSI after decomposition by EEMD,in which interannual scale change was predominant with maximum variance contribution rate.The sc_PDSI of non-karst and karst regions changed abruptly in 2014 and 2015 in turn,and the changes in karst areas occurred after non-karst areas.In general,the dryness and humidity in karst region were superior to those in non-karst region.2)In the karst region of Southwest China,the proportions of aridification and significant aridification were 42.47%and 12.75%,both were lower than those in non-karst region with proportions of 50.69%and 27.79%,respectively.And the proportion of significant humidified area in karst area was 48.81%,outclassing that in non-karst area with proportion of 36.23%.And the area of significant aridification in karst region was much smaller than in non-karst region.This indicated that both aridification and humidification were better in karst areas than in non-karst areas.3)Vegetation NDVI presented negative correlation with sc_PDSI in both karst and non-karst areas at monthly,annual and multi-year scales.The correlation between vegetation NDVI and sc_PDSI increased with time.There was a time lag in the response of NDVI to sc_PDSI in Southwest China and the percentage of lagging area is 78.87%.The proportion of lagging area in karst and non-karst regions was 76.43%and 68.75%,re

关 键 词：自校正帕默尔指数 集合经验模态分解 多时间尺度响应 喀斯特地区 非喀斯特地区 西南地区 

分 类 号：K903[历史地理—人文地理学] P46[天文地球—大气科学及气象学]