检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:郭亚飞 张丽华 赵锐锋[1] 谢忠奎 王军锋 蒿廉伊 高江平 王梦梦 高晗 GUO Ya-fei;ZHANG Li-hua;ZHAO Rui-feng;XIE Zhong-kui;WANG Jun-feng;HAO Lian-yi;GAO Jiang-ping;WANG Meng-meng;GAO Han(College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China;Gaolan Ecological and Agricultural Integrated Experiment Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)
机构地区:[1]西北师范大学地理与环境科学学院,兰州730070 [2]中国科学院西北生态环境资源研究院皋兰生态与农业综合试验站,兰州730000
出 处:《生态学杂志》2021年第7期1895-1906,共12页Chinese Journal of Ecology
基 金:国家自然科学基金项目(41761043、41201196和41261047);西北师范大学青年教师科研能力提升计划(NWNU-LKQN2020-06和NWNU-LKQN-17-7);甘肃省科技计划项目(20YF3FA042)资助。
摘 要:降水是半干旱荒漠草原生态系统最主要的水分来源之一,生长季降雨量的变化直接影响植物生长,改变物种间关系,进而影响植物群落的结构和功能。本研究以黄土高原西部荒漠草原为对象,开展了3年的生长季降雨控制试验(-40%,-20%,CK,+20%和+40%),通过月尺度视角来探究降水变化对植物群落密度、高度、盖度、功能型组成、优势物种重要值及物种多样性的影响。结果表明:相比于增水处理,极端减水处理(-40%)对半干旱荒漠草原植物群落密度、高度和盖度的影响显著(P<0.05),且降水处理的效应在植物生长季中后期(7月、8月和9月)明显强于前期(5月和6月),7月和8月的降水对半干旱区荒漠草原植被的生长最为关键;极端减水处理导致植物群落结构发生改变,群落中短花针矛重要值增加,而灌木亚菊重要值降低,极端减水处理导致禾本科植物的优势度增加;3年极端减水处理导致群落的物种丰富度和多样性水平有降低趋势,不利于植物群落的稳定发展;连续的极端增水处理(+40%)导致物种丰富度高于其他处理,并与减水处理组形成显著差异(P<0.05)。基于未来降水格局变化不断加剧的背景,在生长季内不同时期对荒漠草原进行更实时的管理控制,对于生态环境敏感区的植被保护和稳定性维持具有重要的意义。Precipitation is one of the most important water sources in semi-arid desert steppe.The changes of rainfall in growing season directly affect plant growth,interspecific relationship,and thus the structure and function of plant community.In this study,a three-year rainfall manipulation experiment(-40%,-20%,0(CK),+20%,+40%rainfall in growing season)was carried out in the desert steppe in the west of the Loess Plateau,to explore the effects of precipitation change on density,height,coverage,functional type composition,the importance value of dominant species,and species diversity of plant communities from the perspective of monthly scale.It was found that:(1)compared with the increasing rainfall treatments,there were significant effects of extreme reducing rainfall(-40%)on the density,height and coverage of plant communities(P<0.05),with such effects being significantly stronger in the middle and late growing season(July,August and September)than in the early growing season(May and June).The rainfall in July and August was the key factor driving plant growth in the semi-arid area.(2)Extreme rainfall reduction altered plant community structure by increasing the importance value of Stipa breviflora and decreasing that of Ajania fruticulosa.Extreme rainfall reduction increased the dominance of Gramineae species.(3)The three-year extreme rainfall reduction decreased plant species richness and diversity,which was not conducive to the stability of plant community.However,the continuous extreme rainfall increasing treatment(+40%)resulted in higher species richness than other treatments,and had significant difference with the precipitation reduction treatments(P<0.05).Under the scenario of changes in precipitation regime,more real-time management of desert steppe in different periods during the growing season is of great significance for vegetation protection and stability maintenance in ecologically sensitive areas.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.171