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应用生态学报 ›› 2019, Vol. 30 ›› Issue (6): 1833-1839.doi: 10.13287/j.1001-9332.201906.008

• 稳定同位素生态学专栏 • 上一篇    下一篇

喀斯特季节性雨林植物叶片碳同位素组成及水分利用效率

黄甫昭1,2, 李冬兴1,2, 王斌1,2, 向悟生1,2, 郭屹立1,2, 文淑均1,2, 陈婷1,2, 李先琨1,2,*   

  1. 1广西壮族自治区中国科学院广西植物研究所, 广西喀斯特植物保育与恢复生态学重点实验室, 广西桂林 541006;
    2广西友谊关森林生态系统国家定位观测研究站, 广西凭祥 532600
  • 收稿日期:2018-11-14 出版日期:2019-06-15 发布日期:2019-06-15
  • 通讯作者: * E-mail: xiankunli@163.com
  • 作者简介:黄甫昭,男,1985年生,硕士,助理研究员. 主要从事生物多样性和恢复生态学研究. E-mail: hfuzhao@163.com
  • 基金资助:
    国家自然科学基金项目(31800371,31660130)、国家重点研发计划项目(2016YFC0502405)、广西自然科学基金项目(2016GXNSFBA380122)、广西重点研发计划项目(桂科AB16380256)和广西喀斯特植物保育与恢复生态学重点实验室自主课题项目(17-259-23)资助

Foliar stable carbon isotope composition and water use efficiency of plant in the Karst seasonal rain forest.

HUANG Fu-zhao1,2, LI Dong-xing1,2, WANG Bin1,2, XIANG Wu-sheng1,2, GUO Yi-li1,2, WEN Shu-jun1,2, CHEN Ting1,2, LI Xian-kun1,2,*   

  1. 1Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China;
    2Guangxi Youyiguan Forest Ecosystem National Research Station, Pingxiang 532600, Guangxi, China
  • Received:2018-11-14 Online:2019-06-15 Published:2019-06-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31800371, 31660130), National Key Research and Development Program of China (2016YFC0502405), Guangxi Natural Science Foundation (2016GXNSFBA380122), Guangxi Key Research and Development Program (Guike AB16380256) and Fund of Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain (17-259-23)

摘要: 研究喀斯特季节性雨林不同生境代表性树种及同一树种不同生境下叶片δ13C值及水分利用效率(WUE),丰富喀斯特季节性雨林物种生态位分化及物种共存理论,可为喀斯特地区石漠化治理树种选择及配置提供参考.结果表明: 喀斯特季节性雨林树种叶片δ13C值的范围为-34.13‰~-29.69‰,平均值为(-31.40±1.19)‰,WUE的范围为9.08~58.76 μmol·mol-1,均值为41.79 μmol·mol-1,低于更高纬度的亚热带和暖温带森林,但高于更低纬度的热带雨林和同一纬度的非喀斯特季节性雨林;从洼地到山顶,随着干旱指数的增加,不同生境代表性树种的水分利用效率逐渐增大;同一树种δ13C值和WUE也是从洼地到山顶逐渐增高.树种水分利用效率除了与气候等因子相关外,还与植物所处生境的地质背景、水分可利用性相关.同一气候条件下,喀斯特区植物的水分利用效率要高于非喀斯特区、干旱生境植物的水分利用效率高于湿润生境,说明不同的水分利用效率是喀斯特地区植物适应不同生境、实现多物种共存的策略之一.

Abstract: To enrich niche partition and species coexistence theory in karst seasonal rain forest, and provide reference for species selection and configuration for rocky desertification control, we exami-ned foliar stable carbon isotope composition (δ13C) and water use efficiency (WUE) of the representative species in different habitats and the same tree species in different habitats. The results showed that foliar δ13C value in karst seasonal rain forest ranged from -34.13‰ to -29.69‰, with a mean value of (-31.40±1.19)‰. WUE ranged from 9.08-58.76 μmol·mol-1, with a mean value of 41.79 μmol·mol-1. Both of them were lower than subtropical and warm temperate forests at higher latitude, but higher than tropical rain forests at lower latitude and non-karst seasonal rain forests at the same latitude. The foliar δ13C value and WUE of representative species gradually increased with the increases of drought index from the depression to the top of the mountain. The foliar δ13C value and WUE of the same tree species increased with altitude. These results indicated that water use efficiency of tree species was not only related to climate factors, but also related to the geological background and water availability of the habitat. The water use efficiency of plants in karst area was higher than that in non-karst area, and was higher in dry habitat than in wet habitat under the same climatic condition. It showed that having different water use efficiencies was one of the strategies for plants in karst area to adapt to different habitats and maintain species coexistence.