文献类型：期刊文献

中文题名：南亚热带10种造林树种的水力结构和水力安全

英文题名：Hydraulic architecture and safety margin in ten afforestation species in a lower subtropical region

作者：黄冬柳[1] 项伟[1] 李忠国[1,2] 朱师丹[1]

第一作者：黄冬柳

机构：[1]广西大学亚热带农业生物资源保护与利用国家重点实验室,广西大学林学院广西森林生态与保育重点实验室,南宁530004;[2]中国林业科学研究院热带林业实验中心,广西凭祥532600

年份：2022

卷号：46

期号：5

起止页码：602-612

中文期刊名：植物生态学报

外文期刊名：Chinese Journal of Plant Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金(32060330);广西八桂青年学者项目。

语种：中文

中文关键词：导水率;抗栓塞能力;生长速率;水力安全;人工林管理

外文关键词：hydraulic conductivity;cavitation resistance;growth rate;hydraulic safety;plantation management

分类号：S725.1

摘要：南亚热带地区人工纯林面积大,但是结构简单,对气候变化响应敏感。在区域气候干旱化的背景下,造林树种的生理生态策略及其对季节性干旱的响应亟待研究。该研究选择南亚热带地区10种造林树种(包括6种乡土种和4种外来种),测定这些树种的平均生长速率、水力学性状以及经济学性状,分析性状与生长速率之间的相关关系,并比较水力安全边际和气孔安全边际的种间差异。结果发现:(1)造林树种的生长速率与木质部导水率显著正相关,但与木材密度、比叶面积以及水力安全性指标无显著相关性。(2)造林树种的水分传导效率性和安全性之间没有权衡关系,外来树种Acaciacrassicarpa和Eucalyptus grandis×urophylla同时具有较高的木质部导水率和较强的抗栓塞能力。(3)造林树种的水力安全边际和气孔安全边际的种间差异显著,大叶相思(Acaciaauriculiformis)、红锥(Castanopsishystrix)、壳菜果(Mytilarialaosensis)和阴香(Cinnamomum burmannii)在干季发生水力失败的风险较高。建议南亚热带人工林的生态监测指标体系中应包括树木水力学性状,进而为人工林的可持续经营管理提供重要参考。
Aims In the lower subtropical region of China, there are large areas of single-species plantations. These plantations have simple community structure and thus are sensitive to climate change. Under the background of regional climate drying, the eco-physiological strategies of these afforestation species and their response to seasonal drought should be investigated.Methods We selected ten tree species that are commonly planted in this region including six native species and four exotic species. Based on measurements of the mean growth rate, hydraulic traits, and economics traits, we analyzed the trait-growth correlations within each species and compared the differences in hydraulic safety margin and stomatal safety margin among species.Important findings(1) The growth rate was significantly and positively correlated with hydraulic conductivity,but not with the economic traits, such as wood density, specific leaf area, and hydraulic safety-related traits.(2)There was no significant trade-off between hydraulic efficiency and safety. Two of the exotic tree species, Acacia crassicarpa and Eucalyptus grandis × urophylla, showed both high hydraulic conductivity and great cavitation resistance.(3) There were significant differences in hydraulic safety margin and stomatal safety margin among the tested species. During the dry season, Acacia auriculiformis, Castanopsis hystrix, Mytilaria laosensis and Cinnamomum burmannii would suffer from higher risks of hydraulic failure than the other species. We suggest that tree hydraulic traits should be included into the index system of ecological monitoring of subtropical plantations,which can provide important references for sustainable management of these plantations.