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

doi:10.13287/j.1001-9332.201708.024

应用生态学报 ›› 2017, Vol. 28 ›› Issue (8): 2461-2469.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

张璐颖^1,2,3, 李雪建^1,2,3, 杜华强^1,2,3*, 崔璐^1,2,3, 毛方杰^1,2,3, 刘玉莉^1,2,3, 李阳光^1,2,3,
朱迪恩^1,2,3

¹省部共建亚热带森林培育国家重点实验室, 浙江临安 311300
²浙江省森林生态系统碳循环与固碳减排重点实验室, 浙江临安 311300
³浙江农林大学环境与资源学院, 浙江临安 311300

收稿日期:2017-01-22 发布日期:2017-08-18
通讯作者: * E-mail: dhqrs@126.com
作者简介:张璐颖,女,1996年生.主要从事林业3S技术研究.E-mail:1250765999@qq.com
基金资助:
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

Simulating canopy reflectance time series for typical subtropical forest by coupling PROSPECT5 and 4SAIL models

ZHANG Lu-ying^1,2,3, LI Xue-jian^1,2,3, DU Hua-qiang^1,2,3*, CUI Lu^1,2,3, MAO Fang-jie^1,2,3, LIU Yu-li^1,2,3, LI Yang-guang^1,2,3, ZHU Di-en^1,2,3

¹State Key Laboratory of Subtropical Silviculture, Lin’an 311300, Zhejiang, China
²Zhejiang Province Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Lin’an 311300, Zhejiang, China
³School of Environmental and Resources Science, Zhejiang A&F University, Lin’an 311300, Zhejiang, China

Received:2017-01-22 Published:2017-08-18
Contact: * E-mail: dhqrs@126.com
Supported by:
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)

摘要/Abstract

摘要： 冠层反射率在森林植被类型精确解译、森林碳同化关键参数如叶面积指数(LAI)、叶绿素等遥感反演等方面具有重要意义.本研究以亚热带毛竹林、雷竹林和常绿落叶阔叶混交林3种典型森林类型为研究对象,通过耦合PROSPECT5和4SAIL模型模拟其冠层反射率时间序列.首先,对PROSPECT5和4SAIL模型参数进行敏感性分析,探讨模型参数对冠层反射率的影响;其次,利用实测反射率对不敏感参数进行优化,并确定其参数值;最后,耦合PROSPECT5和4SAIL模型模拟3种亚热带森林冠层反射率,并与MODIS反射率进行对比.结果表明:LAI对第1、2、3、5、7波段最敏感,各波段的总敏感指数分别为0.80、0.83、0.94、0.66、0.47;叶绿素含量对第4波段最敏感,总敏感指数为0.59;叶片含水量对第6波段的敏感性最大,总敏感性指数为0.54;叶子结构参数、类胡萝卜素、热点参数、干物质含量和土壤干湿比等参数对各个波段都不敏感或敏感性较小.优化后的PROSPECT5和4SAIL模型模拟得到的冠层反射率能够真实反映3种典型森林的季节性变化规律,通过与MODIS反射率对比分析发现,模拟冠层反射率和MODIS反射率之间具有较高的决定系数,分别为0.86、0.90、0.93,均方根误差(RMSE)也较小,分别为0.09、0.07、0.05,且模拟反射率能在一定程度上解决MODIS反射率数据冬季易受雨雪、混合像元影响等问题.

Abstract: Canopy reflectance has important meanings in the aspects of accurate interpretation of 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 simulated 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.

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.

ZHANG Lu-ying, LI Xue-jian, DU Hua-qiang, CUI Lu, MAO Fang-jie, LIU Yu-li, LI Yang-guang, ZHU Di-en. Simulating canopy reflectance time series for typical subtropical forest by coupling PROSPECT5 and 4SAIL models[J]. Chinese Journal of Applied Ecology, 2017, 28(8): 2461-2469.

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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

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