文献类型：期刊文献

英文题名：Alleviating Drought Stress Effects on Photosynthetic Productivity of Larix Decidua Through Physiological Process by Management Measures

作者：Wu, Chunyan[1] Yang, Tingdong[2] Cheng, Min[3] Chen, Dongsheng[1] Sun, Xiaomei[1] Zhang, Shougong[1]

第一作者：吴春燕

机构：[1] State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China; [2] Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing, China; [3] Institute of Land and Urban-Rural Development, Zhejiang University of Finance and Economics, Hangzhou, 310018, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230398802)

语种：英文

外文关键词：Carbon dioxide - Efficiency - Forestry - Image reconstruction - Physiology - Soil moisture - Three dimensional computer graphics

摘要：Plantations play a critical role in timber production and eco-physiology, but having unreasonable structure and low productivity issues. Thinning is an effective management strategy to enhance structure under global warming. However, little is currently known about how thinning mitigate the impact of global change on plantations photosynthetic productivity. This study aims to investigate the effects of thinning (?45% cross-sectional area) and rainfall exclusion treatment (?30% precipitation) on larch plantations. We have developed algorithms, and investigated canopy architecture, tree-rings stable carbon isotopes, intrinsic water use efficiency (iWUE), and photosynthetic physiology. We have developed a precise three-dimensional (3D) reconstruction technique for canopies, addressing the previously elusive relationship between them (especially coniferous species). Thinning increased the cumulative leaf area index (cLAI), tree-rings δ13C, and iWUE values. Thinning have been proven to significantly enhance tree photosynthetic physiological state, involving reducing transpiration rates and chlorophyll content, improving iWUE and nutrient supply, and addressing environmental drivers such as light intensity, atmospheric carbon dioxide concentration, and soil moisture, to mitigate the adverse effects of climate-environment stress on photosynthetic productivity. This study provides a theoretical basis for the phenotypic analysis of tree genetic breeding and offers insights into tapping carbon sequestration potential under global warming. ? 2023, The Authors. All rights reserved.