文献类型：期刊文献

英文题名：Response Characteristics of Photosynthetic Productivity to the Canopy Spatial Distribution Pattern of Larix kaempferi

作者：Wu, Chunyan[1] Chen, Dongsheng[1] Xia, Guowei[2] Sun, Xiaomei[1] Zhang, Shougong[1]

第一作者：吴春燕

通信作者：Sun, XM[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat State Forestry &, Beijing 100091, Peoples R China;[2]Guizhou Univ Nationalities, Sch Eco Environm Engn, Guiyang 550025, Peoples R China

年份：2023

卷号：14

期号：6

外文期刊名：FORESTS

收录：;EI(收录号：20232814366096);Scopus(收录号：2-s2.0-85164198560);WOS:【SCI-EXPANDED(收录号:WOS:001014740200001)】；

语种：英文

外文关键词：specific leaf area; canopy photosynthetic productivity; physiological parameters; spatial structure; photosynthetic light-response curves

摘要：The spatial distribution of the forest canopy plays an important role in the transpiration and photosynthetic capacity of trees, ultimately affecting their growth and biomass production. Despite its importance, how canopy photosynthetic productivity enhancement depends on canopy spatial distribution remains unclear. To address this knowledge gap, we conducted a study on Larix kaempferi (Lamb.) Carriere (L. kaempferi) plantations in Gansu, China, investigating the relationship between canopy height, leaf area, seasonal variations in canopy spatial distribution, and photosynthetic parameters. The results showed that the net photosynthetic rate, stomatal conductance, and transpiration rate of L. kaempferi increase with greater canopy height, while photosynthetically active radiation shows the opposite trend. Canopy photosynthetic productivity peaked in April, May, and June when the height in the canopy was 40%, followed by 20%, and then 30% from the perspective of spatiotemporal canopy spatial distribution. Maximum leaf area (10.7 m(2)) and photosynthesis productivity (919.6 mg & BULL;C & BULL;h(-1)) were observed when the height in the canopy ranged from 48%-59%. The changes increased sunlight exposure (75%-88%, 88%-100%) in different canopy areas. Additionally, there was a decrease in the amount of space covered by shade (25%-38%, 50%-63%, and 63%-75%), depending on the specific region within the canopy. By scientifically managing stand density, the canopy spatial distribution can be optimized for photosynthesis, resulting in maximum light interception rates, enhanced photosynthetic capacity, and reduced "non-functional canopy". These findings offer effective and scientifically informed management strategies for the forestry industry. By optimizing the structure of the canopy, specifically in L. kaempferi, these strategies aim to maximize photosynthetic productivity.