应用生态学报2017，Vol.28Issue(8)：2461-2469,9.DOI:10.13287/j.1001-9332.201708.024
PROSPECT5耦合4SAIL模型的亚热带典型森林冠层反射率时间序列模拟
Simulating canopy reflectance time series for typical subtropical forest by coupling PROSPECT5 and 4SAIL models.
摘要
Abstract
forest vegetation type and key parameter (leaf area index,chlorophyll content,etc.) retrieval of forest carbon assimilation.In this study,the canopy reflectance time series of three typical subtropical forests (moso bamboo forest,MBF;lei bamboo forest,LBF;evergreen and deciduous broadleaf forest,EDBF) was simulated by coupling PROSPECT5 and 4SAIL models.First,the sensitivity of parameters in PROSPECT5 and 4SAIL model was analyzed to discuss the effects of parameters on the canopy reflectance simulation.Second,unsensitive parameters were optimized using the observed reflectance.Finally,the canopy reflectances of three typical subtropical forests were simula ted using PROSPECT5 and 4SAIL models,and compared with MODIS reflectance dataset.The results showed that leaf area index was most sensitive to bands 1,2,3,5 and 7,with the total-order sensitivity indexes of 0.80,0.83,0.49,0.66 and 0.47,respectively.Chlorophyll content was most sensitive to band 4,with the total-order sensitivity index of 0.59.Leaf water content was most sensitive to band 6,with the total-order sensitivity index of 0.54.Leaf structure,carotenoids content,dry matter content,hot parameter and soil factors were not/low sensitive to these bands.Canopy reflectance simulated using the optimized PROSPECT5 and 4SAIL models had the capability in reflecting the real seasonal changes of three typical subtropical forests.The simulated canopy reflectance significantly correlated with MODIS reflectance,with high R2 of 0.86,0.90,0.93,and low root mean square of 0.09,0.07,0.05 for MBF,LBF,and EDBF,respectively.The simulated canopy reflectance solved to some extent the problems of influence on MODIS reflectance products by precipitation and snow in winter,and mixed pixels.关键词
亚热带森林/冠层反射率/PROSPECT5模型/4SAIL模型/敏感性分析Key words
subtropical forest/canopy reflectance/PROSPECT5 model/4SAIL model, sensitivity analysis引用本文复制引用
张璐颖,李雪建,杜华强,崔璐,毛方杰,刘玉莉,李阳光,朱迪恩..PROSPECT5耦合4SAIL模型的亚热带典型森林冠层反射率时间序列模拟[J].应用生态学报,2017,28(8):2461-2469,9.基金项目
本文由国家自然科学基金项目(31670644,31370637)、浙江省与中国林业科学研究院省院合作林业科技项目(2017SY04)和浙江省自然科学基金项目(LR14C160001,LQ15C160003)资助 This work was supported by the National Natural Science Foundation (31670644,31370637),the Joint Research fund of Department of Forestry of Zhejiang Province and Chinese Academy of Forestry (2017SY04) and the Natural Science Foundation of Zhejiang Province(LR14C160001,LQ15C160003). （31670644,31370637）
