生态学杂志2011，Vol.30Issue(11)：2394-2399,6.
哀牢山亚热带常绿阔叶林光合有效辐射的时空分布
Spatiotemporal distribution pattern of photosynthetically active radiation in subtropical evergreen broadleaved forest in Ailaoshan Mountains of Southwest China.
摘要
Abstract
Photosynthetically active radiation (PAR) is an important ecological factor affecting the energy transformation and matter production of plant ecosystem. Studies on the spatiotemporal distribution patterns of PAR in a plant ecosystem are helpful to understand the physiological and ecological characteristics and photosynthesis of the ecosystem. In this paper, the temporal and vertical distributions of PAR in a coniferous and subtropical evergreen forest in Ailaoshan Mountains of Southwest China were analyzed. At daily scale, the intensity of PAR during passing through the forest canopy decreased gradually. At monthly scale, the PAR flux varied in each forest layer, with the maximum and minimum values above the canopy in February and January, respectively. The diurnal change of the PAR above the canopy (PAR, ) presented a single-peak curve, while that of the PAR at the bottom of the canopy ( PAR2) and in the arbor sub-layers (PAR3 and PAR4) and shrub layer (PAR5) presented an irregular single-peak curve. The PAR,, PAR2, PAR3, PAR4 and PAR, fluxes at yearly scale were 8824. 98, 682. 20, 403. 09, 216.62 and 208.52 mol ? M-2, and the ratios of yearly PAR2, PAR3, PAR4 and PAR, to PAR, were 7.73% , 4. 57% , 2.45% and 0. 92% , respectively. The average PAR,, PAR2, PAR3,PAR4 and PAR5 in rain season were 89.77% , 89.34% , 97.32%% , 116.36% and 115.09% of those in dry season, respectively.关键词
透射率/冠层/乔木亚层/垂直分布Key words
transmissivity/ canopy/ arbor sub-layer/ vertical distribution.分类
农业科技引用本文复制引用
李麟辉,张一平,游广永,姚玉刚,谭正洪,宋清海,罗有勇..哀牢山亚热带常绿阔叶林光合有效辐射的时空分布[J].生态学杂志,2011,30(11):2394-2399,6.基金项目
国家重点基础研究发展计划项目(2010CB833501)、国家自然科学基金项目(31061140359)和中国科学院知识创新工程重要方向项目(KZCX2-YW-Q1-05-04)资助. （2010CB833501）
