滇西北纳帕海湖滨带优势植物杉叶藻(Hippuris vulgaris L.)维管结构对模拟增温的响应  

Response of vascular structure of a lakeside dominant plant species Hippuris vulgaris L. to simulated warming in Napahai wetland of Northwestern Yunnan

作　　者：管东旭 田昆 王志保 张依南 冯春慧 孙梅 GUAN Dong-xu;TIAN Kun;WANG Zhi-bao;ZHANG Yi-nan;FENG Chun-hui;SUN Mei(School of Wetland,Southwest Forestry University,Kunming 650224,China;National Plateau Wetlands Research Center,Southwest Forestry University,Kunming 650224,China）.)

机构地区：[1]西南林业大学湿地学院,昆明650224 [2]国家高原湿地研究中心,昆明650224

出　　处：《生态学杂志》2018年第9期2611-2618,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31760115);云南省高原湿地创新团队(2012HC007);云南省科技计划项目(2017FD103);西南林业大学科研启动基金项目(111706)资助

摘　　要：维管结构是植物的主要物质传输结构,对植物的光合积累、生长发育、适应变化、繁殖扩散等过程具有不可替代的作用。温度是影响维管结构的重要环境因子,但过去对温度如何影响植物维管结构的研究较少涉及湿地植物。本研究以对温度变化较为敏感的滇西北典型高原湿地——纳帕海流域为研究区域,采用开顶式生长室(OTCs)模拟大气增温系统,研究了其湖滨带优势植物杉叶藻(Hippuris vulgaris)维管结构对模拟增温的响应。结果表明,增温对地上茎维管结构的影响较大,而对地下茎维管结构的影响相对较小。大气增温显著增加了地上茎维管结构的导管和筛管数目、大小以及维管束大小,但对地上茎导管和筛管密度影响不大。与此相反,大气增温显著减小了地下茎导管和筛管大小,但这两个性状在两组增温处理间均无显著差异,其他地下茎维管结构性状对增温的响应不显著。年平均温度和日间平均温度是影响杉叶藻维管性状的主要因素,该两个温度变量与这些维管性状均呈正相关。研究表明,气候变暖显著影响滇西北高原湿地湖滨带优势植物维管结构的传输能力,且这种影响可能导致湿地生态系统植物生理功能的改变,进而促使植物适应增温环境。Vascular structure is the main transport structure of plants,which plays an irreplaceable role in the processes of plant photo-accumulation,growth and development,adaption to changes,reproduction and dispersal. Temperature is an important environmental factor affecting vascular structure. How temperature affects the vascular structure of wetland plants,however,is not well understood. In this study,we studied the responses of vascular structure of a lakeside dominant plant species Hippuris vulgaris L. to simulated warming,by using open-top growth chambers（ OTCs） in Napahai basin. Napahai basin is a typical plateau wetland in Northwestern Yunnan and belonged to the temperature-sensitive area. The results showed that warming had greater effects on the vascular structure of the aboveground stem,but had less influence on that of the underground stem. For the aboveground stem,warming significantly promoted the number and size of catheters and screens,and the size of vascular bundle,but with minor effects on the density of catheters and screens. In contrast,warming significantly reduced the size of conduits and screens in underground stem,but both traits didn＇t show significant differences between the two warming treatments. Warming had no effects on other traits of vascular structure in underground stem. The mean annual temperature（ MAT） and mean daily temperature（ MDT） were the main factors affecting vascular traits,both of which had positive correlations with all the vascular traits.Our results indicated that climate warming obviously affected the transmission capacity of vascular structures of lakeside dominant plants in the plateau wetland of Northwestern Yunnan,which may lead to changes in physiological functions of plants and thus facilitate plant adaption to the warming environment.

关 键 词：滇西北高原 大气增温 维管结构 传输能力 

分 类 号：Q945[生物学—植物学]