草业科学2018，Vol.35Issue(4)：781-790,10.DOI:10.11829/j.issn.1001-0629.2017-0338
增温与氮沉降对高寒植物净光合速率的影响
Effect of climate warming and nitrogen deposition on net photosynthetic rate of alpine plants on Qinghai-Tibet Plateau
摘要
Abstract
Simulated warming and nitrogen deposition experiments were conducted to examine the responses of the net photosynthetic rate of key dominant plants in four types of alpine grasslands,including alpine meadow, alpine steppe,alpine desert,and artificial grassland on Qinghai-Tibetan Plateau by using Li-6400.There were seven treatments:control [CK,0 kg?(ha?a)-1],low nitrogen Ⅰ [NⅠ,8 kg?(ha?a)-1],low nitrogen Ⅱ[NⅡ,24 kg?(ha?a)-1],medium nitrogen [NⅢ,40 kg?(ha?a)-1],high nitrogen Ⅰ [NⅣ,56 kg?(ha?a)-1],high nitrogen Ⅱ [NⅤ,7 2 kg?(ha?a)-1],warming [W,0 kg?(ha?a)-1],and the inter-action of warming and nitrogen addition[W-NⅠ,8 kg?(ha?a)-1].The results showed that 1)the net photo-synthetic rate of Dracocephalum heterophyllum and Stipa capillata increased initially and then decreased with the increasing gradients of warming and nitrogen addition.With increasing nitrogen deposition,the net photo-synthetic rate of Artemisia scoparia,Silene aprica,Kobresia humilis,Poa crymophila,and P.attenuate in the alpine meadow increased markedly.2)The net photosynthetic rate of Thermopsis lanceolate,Iris lactea var.chinensis,and Potentilla multifida increased with nitrogen deposition,while that of K.humilis,Planta-go depressa,A.scoparia,K.capillifolia,P.crymophila,Pedicularis kansuensis,Elymus nutans,and Dracocephalum heterophyllum decreased with nitrogen deposition.3)The net photosynthetic rate of T.lance-olate,P.crymophila,and Aster tataricus in the artificial grassland decreased initially and increased thereafter with the increase of nitrogen deposition.4)The net photosynthetic rate of Blysmus sinocompressus in soil-salinization grassland decreased,while that of Ceratoides compacta in alpine desert and Leymus secalinus in the transitional zone between soil-salinization grassland and desert increased with the experimental warming.关键词
青藏高原/光合作用/高寒草甸/高寒草原/栽培草地/高寒荒漠Key words
Qinghai-Tibetan Plateau/photosynthesis/alpine meadow/alpine steppe/pasture/alpine desert分类
农业科技引用本文复制引用
冯憬,沈豪,张相锋,董世魁,赵金博,赵珍珍,韩雨晖,沙威,杨明岳,李帅..增温与氮沉降对高寒植物净光合速率的影响[J].草业科学,2018,35(4):781-790,10.基金项目
国家重点研发计划课题(2016YFC0501900-06) （2016YFC0501900-06）
环境模拟与污染控制国家重点联合实验室联合项目(17L03ESPC) （17L03ESPC）
