摘要
作为表征植被冠层结构的核心参数之一,叶面积指数(LAI)控制着植被冠层的多种生物物理和生理过程,如光合、呼吸、蒸腾、碳循环、降水截获、能量交换等.本文首先阐述了森林冠层地面LAI光学测量方法的理论基础和数学模型;其后介绍了目前主流光学测量方法的测量原理及其优缺点;归纳了LAI光学测量方法的主要误差来源(聚集效应、非光合作用组分、观测条件和地形效应),并分析总结了聚集效应、非光合作用组分和地形效应的定量评估现状;最后展望了森林冠层地面LAI光学测量方法的未来发展方向.
Leaf area index（LAI） is an important parameter of canopy structure,because it relates to many biophysical and physiological processes of canopy,including photosynthesis,respiration,transpiration,carbon cycling,precipitation interception,and energy exchange,etc.This paper introduced the theoretical bases and mathematical models of optical methods for forest canopy LAI determination,introduced the principles,merits,and drawbacks of currently used optical methods,and summed up the main sources of the errors in LAI optical measurement,including clumping effect,non-photosynthesis components,measurement conditions,and terrain effect.The developing status of quantitatively evaluating clumping effect,non-photosynthesis components,and terrain effect was analyzed,and the promising development directions of optical methods for measuring forest canopy LAI were discussed.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第11期2971-2979,共9页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(41001203
30972299)
国家重点基础研究发展计划项目前期研究专项(2009CB426310)
福州大学科技发展基金项目(2010-XQ-15)
国家高技术研究发展计划项目(2007AA10Z227)资助
