科尔沁沙质草地植物群落对增温的响应  

Response of plant community to experimental warming in Horqin Sandy Land

作　　者：包天玲 刘继亮 苑峰 李寅龙 贾振宇 潘成臣 Bao Tianling;Liu Jiliang;Yuan Feng;Li Yinlong;Jia Zhenyu;Pan Chengchen(Naiman Desertification Research Station,Northwest Institute of EcoEnvironment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Linze Inland River Basin Research Station,Northwest Institute of EcoEnvironment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Inner Mongolia Caoye Technology Innovation Center Co.,Ltd.,Hohhot 010050,China;Inner Mongolia Mengcao Soil Science and Technology Co.,Ltd.,Hohhot 010010,China;Mengcao Ecologi-cal Environment(Group)Co.,Ltd.,Hohhot 010010,China)

机构地区：[1]中国科学院西北生态环境资源研究院奈曼沙漠化研究站,甘肃兰州730000 [2]中国科学院西北生态环境资源研究院临泽内陆河流域研究站,甘肃兰州730000 [3]中国科学院大学,北京100049 [4]内蒙古草业技术创新中心有限公司,内蒙古呼和浩特010050 [5]内蒙古蒙草土壤科技有限责任公司,内蒙古呼和浩特010010 [6]蒙草生态环境(集团)股份有限公司,内蒙古呼和浩特010010

出　　处：《中国沙漠》2024年第1期151-160,共10页Journal of Desert Research

基　　金：国家自然科学基金项目(42377043,41773086);内蒙古自治区科技计划项目(2023YFHH0046)。

摘　　要：全球变暖对植物群落结构及其功能有重要影响。草地生态系统的植物群落对变暖响应极为敏感,但其响应却表现出极大的不确定性。本文通过开顶式气室(Open top chamber,OTC)模拟增温实验,系统研究了科尔沁沙质草地植物群落对增温的响应。结果表明:(1)增温使黄蒿(Artemisia scoparia)和糙隐子草(Cleistogenes squarrosa)的比重分别显著增加了0.04和0.14,使狗尾草(Setaria viridis)的比重显著降低了0.12,改变了植物群落组成;(2)增温显著降低沙质草地植物物种丰富度、Simpson指数、Shannon-Wiener指数,且使植物群落、一年生和多年生草本植物的地上生物量分别显著减少22.71%、26.37%和20.10%;(3)增温改变沙质草地的关键类群和主要植物种间关系,使主要科植物间的相互作用减弱、连通性增加,导致植物群落结构稳定性下降;(4)沙质草地植物物种丰富度、Shannon-Wiener指数、生物量与土壤温度呈显著负相关,与土壤湿度呈显著正相关。总之,沙质草地植物群落对增温响应十分敏感,增温驱动的土壤水分及温度变化不仅降低了植物多样性,导致生物量下降,还会加剧沙质草地退化及其生态功能的下降。Climate warming has important implications for plant community structure and function.Sandy grass-lands are particularly vulnerable to global warming in arid and semi-arid regions.Here,we investigated the ef-fects of experimental warming on plant communities in Horqin Sandy Land of Inner Mongolia,northern China.The results showed that experimental warming had significant impacts on plant community composition.Experi-mental warming caused a rapid increase in the proportion of Artemisia annua and Cleistogenes squarrosa,but a decrease in that of Setaria viridis.The warming significantly reduced species richness,Shannon-Wiener diversity index and Simpson diversity index,as well as the aboveground biomass of entire plant communities,annual and perennial herbs by 22.71%,26.37%and 20.10%,respectively.Network complexity of plant communities de-creased under warmed conditions.In conclusion,plant communities are very sensitive to global warming in Horqin sandy land.The declines in plant diversity and vegetation biomass caused by climate warming likely exac-erbate the degradation of sandy grassland and the decline of ecological functions.

关 键 词：科尔沁沙质草地 增温 植物多样性 生物量 网络分析 

分 类 号：Q945[生物学—植物学]