西南喀斯特地区植被异常区域及驱动因素识别  

Identification of vegetation anomalous areas and driving forces in karst region of southwest China

作　　者：张馨月 彭立[1,2] 张慧娟 赵宇鸾[3,4] ZHANG Xinyue;PENG Li;ZHANG Huijuan;ZHAO Yuluan(College of Geography and Resources,Sichuan Normal University,Chengdu,Sichuan 610101,China;Key Laboratory of Land Resources Evaluation and Monitoring in Southwest,Ministry of Education,Sichuan Normal University,Chengdu,Sichuan 610101,China;School of Geography&Environmental Sciences,Guizhou Normal University,Guiyang,Guizhou 550025,China;The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province,Guiyang,Guizhou 550025,China)

机构地区：[1]四川师范大学地理与资源科学学院,四川成都610101 [2]四川师范大学西南土地资源评价与监测教育部重点实验室,四川成都610101 [3]贵州师范大学地理与环境科学学院,贵州贵阳550025 [4]贵州省喀斯特山地生态环境国家重点实验室培育基地,贵州贵阳550025

出　　处：《贵州师范大学学报（自然科学版）》2024年第5期66-76,共11页Journal of Guizhou Normal University：Natural Sciences

基　　金：国家重点研发计划项目(2022YFF1300701)。

摘　　要：植被在生态系统中发挥着至关重要的作用,区分气候变化和人类活动对植被变化的影响对于植被恢复和管理非常重要。采用Sen-MK检验、相关性分析、Copula函数和地理探测器等方法,分析2000—2020年西南七省植被覆盖度的时空变化,气候条件、夜间灯光强度与归一化差异植被指数(NDVI)之间的相关程度,定义异常区域,评估不同气候和人口压力下植被褐化、绿化概率,最后探讨异常区域植被变化的驱动因素。研究结果表明:1)研究区内69.04%的植被有所改善,喀斯特地区的植被恢复速度已超过非喀斯特地区。2)气温类植被异常区域与研究区人类活动强烈区域和气温上升区域均存在重叠;降水类植被异常区域主要分布在川西地区;人类活动与植被覆盖变化呈正相关的两类异常区域总成对分布在人口密度高,夜间灯光强度大的城镇地区。3)温度对植被的敏感性高于降水且高于人口密度,喀斯特区域的植被对气候变化的响应同步概率高于非喀斯特区域,植被异常区对外界环境变化的异步概率更高。4)植被覆盖变化主要受土壤含水量和夜间灯光强度的主导,影响因素之间主要存在非线性交互作用,其中土壤含水量与夜间灯光强度之间的相互作用最强。研究结果有助于探索植被对外界环境的响应机制,对西南地区生态修复和植被保护规划具有启示意义。Vegetation plays a vital role in the ecosystem.Differentiating between the effects of climate change and human activities on vegetation change is important in the context of vegetation restoration and management.In this study,Sen's slope and the Mann-Kendall test,correlation analysis,Copula function and geodetector were used to analyse the spatial and temporal changes of vegetation cover in the seven southwestern provinces from 2000 to 2020,and the correlation between climatic conditions,nighttime light data and normalized difference vegetation index(NDVI)to define anomalous regions and evaluate vegetation browning and greening probabilities under different climate and population pressures.Finally,the driving factors of vegetation change in anomalous regions are discussed.The results of the study show that:1)69.04%of the vegetation in the study area has been improved,and the rate of vegetation recovery in karst areas has exceeded that in non-karst areas.2)The vegetation anomalous regions of temperature overlap with the areas of strong human activities and rising temperatures in the study area;the vegetation anomalous regions of precipitation are mainly located in the western part of the Sichuan;and the anomalous regions of the two categories of human activities in terms of vegetation cover change are distributed in the urban areas of high population density and high nighttime light intensity.The two types of anthropogenic vegetation cover anomalies are distributed in the urban areas with high population density and high intensity of light at night.3)Temperature is more sensitive to vegetation than precipitation and higher than population density,vegetation in karst regions has a higher probability of being synchronous to climate change than in non-karst regions,and vegetation anomalous regions have a higher probability of being asynchronous to changes in the external environment.4)The change of vegetation cover is mainly dominated by soil moisture content and nighttime light intensity,and there are mainly non-lin

关 键 词：喀斯特 气候变化 地理探测器 COPULA NDVI 

分 类 号：Q948[生物学—植物学]