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PLANT CANOPY GAP-SIZE ANALYSIS THEORY FOR IMPROVING OPTICAL MEASUREMENTS OF LEAF-AREA INDEX

机译:改善叶面积指数光学测量的植物冠层间隙大小分析理论

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摘要

Optical instruments currently available for measuring the leaf-area index (LAI) of a plant canopy all utilize only the canopy gap-fraction information. These instruments include the Li-Cor LAI-2000 Plant Canopy Analyzer, Decagon, and Demon. The advantages of utilizing both the canopy gap-fraction and gap-size information are shown. For the purpose of measuring the canopy gap size, a prototype sunfleck-LAI instrument named Tracing Radiation and Architecture of Canopies (TRAC), has been developed and tested in two pure conifer plantations, red pine (Pinus resinosa At.) and jack pine (Pinus banksiana Lamb). A new gap-size-analysis theory is presented to quantify the effect of canopy architecture on optical measurements of LAI based on the gap-fraction principle. The theory is an improvement on that of Lang and Xiang [Agric. For. Meteorol. 37, 229 (1986)]. In principle, this theory can be used for any heterogeneous canopies. [References: 22]
机译:当前可用于测量植物冠层叶面积指数(LAI)的光学仪器都仅利用冠层间隙分数信息。这些仪器包括Li-Cor LAI-2000植物冠层分析仪,Decagon和Demon。显示了同时利用冠层间隙分数和间隙尺寸信息的优势。为了测量树冠间隙的大小,已开发了原型“ sunfleck-LAI”仪器,称为“追踪辐射和树冠结构(TRAC)”,并在赤松(Pinus resinosa At。)和杰克松(Pinus resinosa At。)两种纯人工林中进行了测试。松(Pinus bankiana Lamb)。提出了一种新的间隙尺寸分析理论,基于间隙分数原理量化了冠层结构对LAI光学测量的影响。该理论是对Lang和Xiang [Agric。对于。陨石37,229(1986)]。原则上,该理论可用于任何异类冠层。 [参考:22]

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