广东省2004—2016年植被冠层降雨截留模拟及时空变化特征  

The simulation and spatial-temporal variations of atmospheric rainfall interception by vegetation canopies based on MODIS LAI data at the basin scale in the Guangdong Province from 2004 to 2016

作　　者：孙彩红 苏泳娴[1] 韩留生[1,2] 吴建平 刘礼杨 陈修治[3] 邓玉娇 杨沅志 姜杰 林晖 SUN Caihong;SU Yongxian;HAN Liusheng;WU Jianping;LIU Liyang;CHEN Xiuzhi;DENG Yujiao;YANG Yuanzhi;JIANG Jie;LIN Hui(Guangdong Provincial Key Laboratory of remote sensing and GIS,Guangdong Open Laboratory of Geospatial Information Technology and Application,Guangzhou Institute of Geography,Guangzhou 510070,China;Shandong University of Technology,Zibo 255049,China;South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,China;Guangdong Ecological Meteorological Center,Guangzhou 510640,China;Guangdong Forestry Survey and Planning Institute,Guangzhou 510520,China;Guangdong Environmental Protection Engineering Vocational College,Foshan 528216,China)

机构地区：[1]广东省遥感与地理信息系统重点实验室,广东省地理空间信息技术与应用开放实验室,广州地理研究所,广州510070 [2]山东理工大学,淄博255049 [3]中国科学院华南植物园,广州510650 [4]广东省生态气象中心,广州510640 [5]广东省林业调查规划院,广州510520 [6]广东环境保护工程职业学院,佛山528216

出　　处：《生态学报》2020年第7期2252-2266,共15页Acta Ecologica Sinica

基　　金：国家自然科学基金(41971275,31971458,41907289);广东省科学院实施创新驱动发展能力建设专项(2019GDASYL⁃0103002)。

摘　　要：评价植被冠层降雨截留能力,是生态系统水循环的重要研究内容。以广东省中小流域为例,结合地面监测站点的降雨量数据和MODIS叶面积指数遥感数据,利用植被冠层降雨截留模型,定量模拟和分析了广东省流域尺度2004-2016年的地表植被冠层降雨截留能力及其时空变化特征。结果表明:(1)2004-2012年广东省年均植被冠层降雨截留率持续下降,2016年略有上升,并且随着时间的推移,流域之间的植被冠层降雨截留率差异越来越小。(2)广东省植被冠层降雨截留能力呈现山区东西两翼高,山区中部以及沿海地区低的显著空间差异格局,这种空间格局与植被覆盖LAI主要呈现由珠三角向外围递增的圈层空间格局特征密切相关,而与由南向北逐渐递减的降雨空间格局特征相关性不大。(3)森林覆盖对流域植被冠层降雨截留能力有着一定的影响,其中流域内阔叶林占森林面积的比例对这种影响的程度起着最为关键的作用。Evaluating the rainfall interception capacity of vegetation canopies is an important component of water cycling in ecological systems.We employed a model of atmospheric rainfall interception by vegetation canopies with observed precipitation data from weather stations and MODIS leaf area index(LAI)data to quantitatively estimate the rainfall interception capacity of the vegetation canopy at a small-medium basin scale in the Guangdong province from 2004 to 2012 and reveal its spatial and temporal variation.The results showed that:(1)the annual mean rainfall interception rate of the canopy(RIRC)in Guangdong Province declined continuously during 2004-2012 but increased slightly in 2016.The spatial variability of RICR has diminished progressively as time goes on.(2)The RICR in Guangdong Province presented distinctive spatial patterns and was higher in the east and west mountain areas but lower in the central mountain and coastal areas.This spatial pattern was closely related to the spatial pattern of LAI,which mainly presented a ring pattern that increased from the Pearl River Delta to the periphery,but was not very related to the spatial pattern of rainfall,which showed a gradual decreasing trend from south to north.(3)The forest coverage rate had a certain impact on the canopy interception capacity,especially the areas of broad-leaved forest in the basins.

关 键 词：降雨截留率 植被冠层 时空格局 LAI 遥感 流域 

分 类 号：Q948[生物学—植物学]