草业科学2012，Vol.29Issue(4)：577-585,9.
放牧对高寒草地4种草光响应和荧光特性的影响
Influence of grazing on photosynthesis-light response and fluorescence parameters of four plants in alpine grassland
摘要
Abstract
Two plots,non-grazing（NG） and grazing（G） grassland,were designed to determine the influence of grazing on photosynthesis-light response and chlorophyll fluorescence characteristics of Kobresia humilis,Elymus nutans,Melissitus rutenica,Oxytropis ochrocephala growing in the alpine grassland at Nanni Valley,Tianzhu County of the eastern Qilian Mountains.The results of this study showed the grazing increased the adaptability of the four plants to glare and reduced the ability to use low light.In grazing conditions Pmax of K.capillifolia,E.nutans,and M.rutenica reduced significantly,which reduced their photosynthetic potential,but Pmax of O.ochrocephala increased significantly,which enhanced its photosynthetic capacity.Image of minimal fluorescence（F0） of the four plants deepen the color in the grazing condition,especially K.capillifolia and E.nutans.The maximal quantum yield of PSⅡ（Fv/Fm）,photochemical quenching coefficient（qP） and electron transport rate（ETR） of the four plants reduced significantly and the non-photochemical quenching coefficient（NPQ） increased significantly in the grazing conditions.From all measured indicators,this study indicated that the grazing increased the photosynthetic capacity of O.ochrocephala,a kind of weeds but reduced the photosynthetic capacity of other three plants with high quality.关键词
放牧/优势植物/光响应曲线/叶绿素荧光Key words
grazing/dominant plants/photosynthesis-light response curves/chlorophyll fluorescence分类
农业科技引用本文复制引用
孙英,陈建纲,张德罡,徐长林,柳小妮..放牧对高寒草地4种草光响应和荧光特性的影响[J].草业科学,2012,29(4):577-585,9.基金项目
国家自然科学基金项目 （）
