贵南县不同物候期高寒草甸牧草营养成分研究  

STUDY ON NUTRIENT COMPOSITION OF ALPINE MEADOW AT DIFFERENT PHENOLOGICAL STAGES

作　　者：马力 王晓彤[1] MA Li(Qinghai Provical Grassland Station,Xining Qinghai 810008,China)

机构地区：[1]青海省草原总站,青海西宁810008

出　　处：《青海草业》2020年第2期2-5,共4页Qinghai Prataculture

摘　　要：青海省贵南县位于青海高原,海拔为3265m,天然草地主要牧草为垂穗披碱草,草地早熟禾、矮生嵩草、二列委陵菜及美丽风毛菊、细叶亚菊等。禾本科及莎草科牧草在3个时期占地上生物量的55%~61%,在青草期(7月)及枯黄期(9月)EE、P的含量最高,返青期CP含量高,枯草期CP含量较青草期CP含量低61.12%,而NDF和ADF的变化规律在冷季中含量高于暖季;地上生物量在青草期(7月)达到最高,为146.56g/m^2,高于枯草期生物量31.11%,牧草平均高度为12.56cm。In Guinan county of Qinghai province,the elevation is 3265 m,and the main species of natural grass-land are Elymus nutans、Poa pratensi、Kobresia humili、Potentill abifurca、Saussurea pulchra and Ajania tenuifo-lia.The Gramineae and Cyperaceae family occupied 55%to 61%of the biomass in 3 periods,The content of EE and P reached the highest in Grassy stage(In July)and in withered and yellow stage(On September),The con-tent of CP reached the highest in returning green stage,The content of CP in the withered stage was lower 61%than that in the grassy stage.The variation patterns of NDF and ADF were higher in cold season than in warm season,Aboveground biomass(146.56 g/m^2)reached highest during the grassy stage(July),the biomass in withered stage was lower than grassy stage 31.11%,the average of the grass are 12.56cm.

关 键 词：物候期 营养成分 天然草地 地上生物量 

分 类 号：S812.5[农业科学—草业科学]