短期氮素添加对高寒草地实测蒸散及生物量的影响  

Effects of Short-Term Nitrogen Addition on Evapotranspiration and Biomass in an Alpine Grassland

作　　者：刘超 盛超亚[4] 王娟 刘俊杰[1,2,3] 丁晓宇 LIU Chao;SHENG Chaoya;WANG Juan;LIU Junjie;DING Xiaoyu(School of Ecology and Environment,Xinjiang University,Urumqi Xinjiang 830017,China;Technology Innovation Center for Ecological Monitoring and Restoration of Desert-Oasis,MNR,Urumqi Xinjiang 830002,China;Key Laboratory of Oasis Ecology,Ministry of Education,Xinjiang University,Urumqi Xinjiang 830017,China;Zhengzhou Broad&Precision Medical Laboratory Co.,Ltd.,Zhengzhou Henan 450000,China)

机构地区：[1]新疆大学生态与环境学院,新疆乌鲁木齐830017 [2]自然资源部荒漠-绿洲生态监测与修复工程技术创新中心,新疆乌鲁木齐830002 [3]绿洲生态教育部重点实验室新疆大学,新疆乌鲁木齐830017 [4]郑州博睿医学检验实验室有限公司,河南郑州450000

出　　处：《新疆大学学报（自然科学版）（中英文）》2023年第4期486-491,504,共7页Journal of Xinjiang University(Natural Science Edition in Chinese and English)

基　　金：新疆维吾尔自治区自然科学基金“不同氮素添加下巴音布鲁克草地蒸散发响应模式及预测”(2020D01C078);新疆大学博士科研启动基金“巴音布鲁克草地蒸散发对氮沉降响应研究”(2020BS01);“天池博士”科研项目“氮素添加对草地生态系统的影响研究”(tcbs201917).

摘　　要：为了更好地理解草地群落实际蒸散和生物量对氮沉降的响应机制,通过短期原位模拟氮沉降实验,在巴音布鲁克高寒草地进行不同水平的氮素添加实验(CK(0 g·m^(−2))、LN(5 g·m^(−2))、MN(10 g·m^(−2))、HN(15 g·m^(−2))、SN(20 g·m^(−2))),研究草地群落不同时间尺度实测蒸散以及地上地下生物量对短期氮素添加的响应.结果表明:不同氮素添加没有改变草地蒸散量日变化特征峰值的出现时间,生长季初期、中期和末期草地蒸散量的峰值分别出现在15时和19时、17时、15时;不同氮素添加处理下蒸散量生长季变化特征在不同生长时期存在差异,其中生长季初期草地蒸散受到氮素添加影响较大,生长季中期和末期受到氮素添加影响较小;氮素添加显著增加了地上生物量,对地下生物量影响较小.In order to better understand the response of measured evapotranspiration and biomass to nitrogen deposition in grassland ecosystems,different levels of nitrogen additions(CK(0 g·m^(−2)),LN(5 g·m^(−2)),MN(10 g·m^(−2)),HN(15 g·m^(−2)),SN(20 g·m^(−2)))were carried out in this paper through short-term in situ simulated nitrogen deposition experiments in Bayinbuluke alpine grassland.We investigated the response of grassland ecosystems to short-term nitrogen addition through measured evapotranspirationat different time scales,aboveground biomass and underground biomass.The results showed that the daily peaks of grass evapotranspiration did not change with different nitrogen additions,and the peaks of grass evapotranspiration at the beginning,middle and end of the growing season occurred at 15:00 and 19:00,17:00,15:00,respectively.The seasonal variation in evapotranspiration under different nitrogen additions varied across the growing season,with grass evapotranspiration being more restricted by nitrogen at the beginning of the growing season and less restricted by nitrogen at the middle and end of the growing season.Nitrogen addition significantly increased aboveground biomass and had less effect on underground biomass.

关 键 词：氮素添加 实测蒸散 生物量 巴音布鲁克 

分 类 号：Q948.1[生物学—植物学]