文献类型：期刊文献

英文题名：Shade tolerance plays an important role in biomass production of different poplar genotypes in a high-density plantation

作者：Wang, Ningning[1,2] Huang, Qinjun[3] Sun, Jingru[1,2] Yan, Suli[1,2] Ding, Changjun[3] Mei, Xindi[1,2] Li, Dan[3] Zeng, Xianjun[3] Su, Xiaohua[3] Shen, Yingbai[1,2]

第一作者：Wang, Ningning

通信作者：Shen, Y[1]|[a0005af9bc02893cd3fd3]沈应柏;

机构：[1]Beijing Forestry Univ, Coll Biol Sci & Technol, Beijing 100083, Peoples R China;[2]Beijing Forestry Univ, Natl Engn Lab Tree Breeding, Beijing 100083, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China

年份：2014

卷号：331

起止页码：40-49

外文期刊名：FOREST ECOLOGY AND MANAGEMENT

收录：;EI(收录号：20143518103596);Scopus(收录号：2-s2.0-84906270011);WOS:【SCI-EXPANDED(收录号:WOS:000343844200006)】；

基金：This research received funding from the Twelfth 5-Year National Science and Technology Support Program (2012BA D01803).

语种：英文

外文关键词：Biomass production; Leaf area index; Photosynthesis; Shade tolerance; Populous

摘要：Poplar (Populus sp.) canopy provides considerable shading in high-density plantations, imposing adverse impacts on crown characteristics relating to biomass production, such as leaf area index (LAI) and photosynthesis. However, it is yet unclear how the LAI, photosynthesis, and biomass production of poplars would respond to shading. In this study, the shading responses were investigated in three poplar genotypes with contrasting biomass performance in a high-density plantation (1667 ha(-1)) established six years prior to the study. A three dimensional laser scanner and a portable photosynthesis system were used to measure the canopy structure and photosynthetic parameters. Principal component analysis (PCA) and the partial least squares method (PLS) were used to determine the importance of measured variables to LAI and biomass. Among all the factors studied, LAI was one of the most related factors to biomass. The genotype with greater shade tolerance ability had higher LAI. Moreover, the high biomass genotype showed a low light compensation point (LCP) and respiration rate (R-d) accompanied with a high ratio of photosynthesis to respiration (A(max)/R-d) and a high maximum photosynthetic rate (A(max)). This characteristic was more distinct in the middle (M) and lower (L) crown layers than in the upper (U) crown layer. Therefore, high LAI, A(max) and A(max)/R-d accompanied by low LSP and R-d are the key traits in obtain a high biomass genotype. Thus, improving shade tolerance in leaves of the middle and lower canopy layer to obtain a high LAI and biomass production can be an effective breeding method. (C) 2014 Elsevier B.V. All rights reserved.