模拟践踏对中位泥炭藓叶绿素荧光特性的影响  

Effect of simulated trampling on the chlorophyll fluorescence characteristics of Sphagnum magellanicum

作　　者：范贝贝 卜兆君[1,2] 刘超 胡雪凤[1,2] 陈永达 FAN Beibei;BU Zhaojun;LIU Chao;HU Xuefeng;CHEN Yongda(Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University , Changchun 130024, China;State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Institute for Peat and Mire Rsearch, Northeast Normal University , Changchun 130024, China)

机构地区：[1]东北师范大学地理科学学院长白山地理过程与生态安全教育部重点实验室,长春130024 [2]东北师范大学泥炭沼泽研究所国家环境保护湿地生态与植被恢复重点实验室,长春130024

出　　处：《广西植物》2019年第10期1298-1306,共9页Guihaia

基　　金：国家自然科学基金(41471043,41871046);国家重点研发计划项目(2016YFC0500407);吉林省科技发展计划项目(20190101025JH)~~

摘　　要：该研究以采自长白山区月亮湾湿地开阔地的红型和林缘的黄绿型中位泥炭藓( Sphagnum magellanicum )为材料,室内模拟人为践踏,使用便携式调制叶绿素荧光仪,测定其叶绿素荧光参数,探讨了不同践踏强度、不同践踏轮次下,两类中位泥炭藓的荧光参数响应情况。结果表明:至第二轮践踏,红型中位泥炭藓的PSⅡ实际光量子产量[ Y (Ⅱ)]和相对电子传递速率( ETR )随践踏强度增大而减小,而黄绿型的践踏组均大于对照组;践踏结束时,红型的 Y (Ⅱ)和 ETR 的践踏组均显著低于对照组,而黄绿型只有轻度践踏低于对照组;黄绿型泥炭藓践踏组的非调节性能量耗散量子产量[ Y ( NO )]甚至要低于对照组。这表明尽管泥炭藓属植物能耐受一定的践踏胁迫,但随着践踏轮次增多、强度增大,胁迫累积效应将强烈抑制其生长;多见于开阔地的红型泥炭藓对人为践踏的耐受能力低于林缘生境的黄绿型泥炭藓。湿地保护与管理中,应减少游人践踏干扰,尤其要严格控制开阔地生境的游人进入。Red and yellow-green Sphagnum magellanicum shoots growing in the open area and forest margin of Yueliangwan wetland, respectively, in the Changbai Mountains were chosen as study materials. A portable pulse-amplitude modulation fluorometer was used in this study to measure chlorophyll fluorescent parameters. We analyzed the fluorescent responses of the two types of S. magellanicum shoots to trampling intensities and trampling rounds by simulating anthropogenic trampling indoor. Effective PS Ⅱ quantum yield [ Y (Ⅱ)] and electron transport rate ( ETR ) of red S. magellanicum decreased with trampling intensity increase, while those of yellow-green type increased with trampling in the second round of trampling. Y (Ⅱ) and ETR of red-type S. magellanicum under anthropogenic trampling were significantly lower than those in control group, while for yellow-green type they under lightly trampling were lower in comparison to those in control group. Non-regulated energy dissipation [ Y ( NO )] of yellow-green S. magellanicum decreased with trampling. Our results indicate that Sphagnum can tolerate certain trampling stress, but its growth will be strongly inhibited by the cumulative effect of the stress. Our study also suggest that yellow-green S. magellanicum in forest margin is more tolerant to trampling than red-type in the open area. Tourist trampling in wetlands especially the open area should be reduced or even strictly forbidden in the protection and management of wetlands in the future.

关 键 词：人为践踏 苔藓植物 叶绿素荧光参数 湿地 泥炭 

分 类 号：Q945[生物学—植物学]