| 摘要: |
| 热带亚热带喀斯特地区具有丰富且独特的自然资源，是我国重要的生态功能区，但也面临严重的石漠化问题。水分是影响该地区天然林结构功能和石漠化植被修复的关键环境因素。基于树木水分生理的研究有助于深入地了解喀斯特树种干旱适应策略，可为气候变化背景下喀斯特地区森林(天然林和人工林)的可持续发展提供理论依据。本文从水分来源、木质部水力结构以及蒸腾耗水等方面总结了近年来该区域喀斯特天然林树种在水分适应策略方面的研究进展，发现典型喀斯特树种能够稳定地利用岩溶水，其蒸腾耗水量的季节动态较小，且其茎木质部的抗栓塞能力强，在极端干旱时期可通过脆弱性分割维持水力安全。另外，基于树木水分生理的研究还能够为石漠化生态恢复适宜树种的筛选和人工林的经营管理提供科学依据。部分抗性强、耗水少的珍贵用材树种兼顾生态和经济效益，可用于石漠化地区的植被修复。建议今后的研究结合控制实验平台，长期监测树种生长和水分动态变化，基于多重机制系统阐明喀斯特森林树种的生态适应策略。 |
| 关键词: 喀斯特 抗旱性 水力性状 水分来源 树干液流 |
| DOI：10.13656/j.cnki.gxkx.20230831.001 |
| 投稿时间：2023-05-15修订日期：2023-06-26 |
| 基金项目:国家自然科学基金项目(32060330)资助。 |
|
| Advances in Water Physiology of Tropical Subtropical Karst Forest |
|
HUANG Dongliu, ZHU Shidan
|
| (Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning, Guangxi, 530004, China) |
| Abstract: |
| The tropical and subtropical karst terrain is of an important ecological function in China for its abundant and distinct natural resources.However,most environmental issues occur in karst areas,particularly aggravated rock desertification.Water is a key environmental factor influencing the structural function of natural forests and the restoration of rocky desertification vegetation in the region.Studies on water physiology of tree in karst region can gain an insight into the drought adaptation strategies of karst tree species and provide a theoretical basis for the sustainable development of natural forests and plantations in these areas in the context of global climate change.In this review,we summarized the up-to-date research on water adaptation strategies of karst natural forest species in the region in terms of water sources,xylem hydraulic structure,and transpiration water consumption.Typical karst tree species were found to be able to utilize karst water stably,with low seasonal dynamics of their transpiration water consumption,and with high resistance to embolism in their stem xylem,which maintains hydraulic security through vulnerability partitioning during extreme drought periods.Furhtermore,studies on water physiology can also shed light on the selecting scenario of suitable tree species for ecological restoration of rocky desertification and management of plantations.In order to balance ecological and economic benefits,some of the valuable timber tree species that are highly drought resistant and consume less water can be used for vegetation restoration in rocky desertification areas.In addition,it is recommended that future studies incorporate controlled experimental platforms to monitor the growth and water dynamics of tree species over time,and to systematically elucidate the ecological adaptation strategies of karst forest tree species based on multiple mechanisms. |
| Key words: karst drought tolerance hydraulic traits water source sap flow |
