退化喀斯特森林不同植物叶片气孔导度对环境因子的响应  

Response of Stomatal Conductance of Different Plant Leaves to Environmental Factors in Degraded Karst Forest

作　　者：丁晓雅 罗绪强 冯双[1] 任艳 莫愁 陆汉芝 李艳琴 秦会斌 Ding Xiaoya;Luo Xuqiang;Feng Shuang;Ren Yan;Mo Chou;Lu Hanzhi;Li Yanqin;Qin Huibin(School of Geography and Resources,Guizhou Education University,Guiyang 550018,Guizhou;Guizhou Provincial Key Laboratory ofGeographic State Monitoring of Watershed,Guiyang 550018,China;Karst Ecosystem Observation Research Station in Puding,Chinese Academy of Sciences,Puding 562100,China)

机构地区：[1]贵州师范学院地理与资源学院,贵州贵阳550018 [2]贵州省流域地理国情监测重点实验室,贵州贵阳550018 [3]中国科学院普定喀斯特生态系统观测研究站,贵州普定562100

出　　处：《山东农业科学》2020年第4期32-37,共6页Shandong Agricultural Sciences

基　　金：国家自然科学基金项目(41563007);国家级大学生创新训练项目(20195200201);贵州师范学院大学生创新训练计划项目(201914223026);贵州省优秀青年科技人才培养对象专项资金项目(黔科合人字〔2015〕21号);贵州省高层次创新型人才资金项目(黔人领发〔2015〕3号)。

摘　　要：为探讨退化喀斯特森林中不同植物叶片气孔导度对环境因子的响应特征及其适应性机制,以中国科学院普定喀斯特生态系统观测研究站沙湾监测研究区内的退化喀斯特森林为例,从中选取8种常见植物为研究对象,分别对其叶片气孔导度及气温、空气湿度、光照强度等环境因子进行测定分析。结果表明:(1)不同植物叶片气孔导度值日间主要在0.011~0.215 mol/(m^2·s)之间变化。植物叶片气孔导度在同一时刻不同种间存在显著差异(P<0.05),而除构树[Broussonetia papyrifera(Linn.)L’Hér.ex Vent.]外,同种植物在不同时刻的差异均不显著(P>0.05)。(2)梓树(Catalpa ovata G.Don)的叶片气孔导度与光照强度呈显著中度负相关(r=-0.534,P=0.040),而马桑(Coriaria nepalensis Wall.)的则呈显著中度正相关(r=0.538,P=0.038)。构树的叶片气孔导度与相对湿度呈极显著高度负相关(r=-0.728,P=0.002),而与气温呈显著中度正相关(r=0.602,P=0.017)。厚果崖豆藤(Millettia pachycarpa Benth.)的叶片气孔导度与相对湿度呈显著中度负相关(r=-0.554,P=0.032)。(3)树种和测定时间对植物叶片气孔导度的交互作用不显著(P>0.05)。(4)研究区大部分植物对生境恶劣的喀斯特环境均具有较强的适应能力,叶片气孔导度的日间变化主要受植物自身遗传因素的控制,对外部环境条件改变的响应不敏感。Stomatal conductance is one of the most direct gas exchange parameters that characterize plant photosynthesis.The response and adaptation of stomatal conductance of different plant leaves to environmental factors in degraded karst forest were studied in this article.The degraded karst forest located in Shawan monitoring area,the Karst Ecosystem Observation Research Station in Puding,Chinese Academy of Sciences was used as the experimental object.The stomatal conductance of eight common plants from the degraded karst forest,and the air temperature,air humidity,light intensity and other environmental factors were measured and analyzed.The results indicated that:(1)the stomatal conductance of the selected common plants mainly ranged from 0.011 to 0.215 mol/(m^2·s)during daytime.There were significant differences in stomatal conductance among different species at the same time(P<0.05).However,the differences of the same species at different time were not significant(P<0.05)except Broussonetia papyrifera(Linn)L’Hér.ex Vent.(2)The correlation between stomatal conductance and light intensity was negatively moderate(r=-0.534,P=0.040)in Catalpa ovata G.Don,while that was positively moderate(r=0.538,P=0.038)in Coriaria nepalensis Wall.The stomatal conductance of Broussonetia papyrifera(Linn.)L’Hér.ex Vent.was very significantly negative correlated with relative humidity(r=–0.534,P=0.040),but significantly positive correlated with air temperature(r=0.602,P=0.017).The stomatal conductance of Millettia pachycarpa Benth.was moderately negatively correlated with relative humidity(r=-0.554,P=0.032).(3)The interaction of tree species and determination time on stomatal conductance was not significant(P>0.05).(4)Most of the plants in the research area have stronger adaptability to the harsh karst environment.The daytime variation of leaf stomatal conductance was mainly controlled by genetic factors,so it was not sensitive to the change of external environmental conditions.

关 键 词：退化喀斯特森林 植物叶片 气孔导度 变异特征 环境响应 

分 类 号：S718.45[农业科学—林学] Q948.11[生物学—植物学]