国产叶面积指数产品在中国区域的一致性检验  

Comparative Analysis of Differences of Leaf Area Index Products in China

作　　者：喻樾 张方敏 陈镜明[2] YU Yue;ZHANG Fangmin;CHEN Jingming(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Jiangsu Key Laboratory of Agricultural Meteorology,College of Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China;Department of Geography and Planning,University of Toronto,Toronto Canada M5S 3G3)

机构地区：[1]南京信息工程大学应用气象学院,气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室,江苏南京210044 [2]多伦多大学地理与规划系,加拿大多伦多M5S3G3

出　　处：《遥感技术与应用》2023年第5期1239-1249,共11页Remote Sensing Technology and Application

基　　金：国家重点研发计划(2018YFC1506606);江苏省碳达峰中和科技创新专项资金(BK20220017)。

摘　　要：叶面积指数是研究全球和区域碳循环、水文循环、气候变化区域响应的重要参数之一,研究不同LAI产品的时空一致性可为该地区LAI产品的使用提供建议和参考。本研究基于流域、DEM和土地利用类型,对GLOBMAP、GLOBALBNU、GLASS的LAI产品从平均值、频率以及差值频率等的变化进行统计,分析3种国产LAI产品在中国区域的一致性。主要结论为:①3种产品均可捕捉中国地区LAI的空间分布和月及年的时间变化特征,GLOBMAP在2001年更换数据源后年平均值开始下降。②3种产品在九大流域、不同DEM、不同地表利用类型分类下均存在差异。在海河流域、黄河流域和内陆河流域,3种产品的相关性较好,但是在长江流域、东南诸河流域以及珠江流域内产品间差值大于2.00的范围较多。2000~4000 m区域内3种产品的年均变化趋势区别存在明显不同。和其他产品相比,在草地区域GLASS较低,在城乡工业用地区域GLOBMAP较低,在林地区域GLOBALBNU较高。定量分析了3套国产LAI产品的时空差异,结果可为国产LAI产品在中国的应用提供科学参考。The Leaf Area Index(LAI)is one of the important parameters to study the global and regional carbon cycle,hydrological cycle,and regional response to climate change.Studying the temporal and spatial consistency of different products can provide suggestions and references for the use of LAI products in this region.This study made statistical analysis on the changes of the average value,frequency and difference frequency of GLOBMAP,GLOBALBNU and GLASS LAIs across different river basins,DEM and land use types.(1)The three products can clearly capture the spatial distribution,monthly and annual variation characteristics of LAI in China.Annual average GLOBMAP started to decline in 2001 since data sources changed.(2)There were differences among the three products under the nine major basins,different DEMs,and different land use types.In the Haihe River Basin,the Yellow River Basin and the Inland River Basin,the correlations of the three products were good,but in the Yangtze River basin,the Southeast River Basin and the Pearl River basin the differences between the three products were more than 2.00.There were obvious differences in the annual average change trends of the three products in the 2000~4000 m area.Compared with other products,GLASS was underestimated in grassland areas,GLOBMAP was underestimated compared in urban and rural industrial land areas,and GLOBALBNU was overestimated in forest land areas.The temporal and spatial differences of three sets of domestic LAI products were quantitatively analyzed,and the results could provide scientific reference for the application of domestic LAI products in China.

关 键 词：叶面积指数 遥感 一致性 中国地区 

分 类 号：Q948[生物学—植物学] TP79[自动化与计算机技术—检测技术与自动化装置]