青海湖北岸草甸草原牧草生物量季节动态研究  

Study on seasonal dynamics of biomass in meadow grassland of north shore of Qinghai Lake

作　　者：朱宝文 周华坤[3] 徐有绪 李英年[3] 唐凯 

机构地区：[1]青海省海北牧业气象试验站,青海西海810200 [2]青海省刚察县气象局,青海刚察812300 [3]中国科学院西北高原生物研究所,青海西宁810000 [4]广东省潮州市气象局,广东潮州521011

出　　处：《草业科学》2008年第12期62-66,共5页Pratacultural Science

基　　金：青海省气象局科研项目(2008005);国家科技支撑课题第一专题(2006BAC01A02-01);中科院西部行动计划二期项目第二课题(KZCX2-XB2-06-02);国家自然科学基金面上项目(30700563);中科院知识创新工程重要方向项目课题(KSCX2-YW-N-040-01)

摘　　要：2007年5—9月在青海湖北岸的高寒草甸草原，定位研究天然草地地下、地上和总生物量的变化动态。结果表明：青海湖北岸高寒草甸草原天然牧草地上生物量有明显的季节变化，在生长季呈单峰曲线，生育初期地上生物量最小．8月中旬达到最大值，为223．0g／m^2；地下生物量空间分布为倒金字塔型，0～10cm层地下生物量占地下生物总量的65％，0～10、10～20和20～40cm层牧草地下生物量在5—9月均表现为“N”型变化规律；地下生物量周转值为0．45；在生长期内地下生物量的积累远远大于地上生物量的积累，地下生物量峰值也比地上生物量峰值提前；群落根冠比先降后升，平均值为16．1。Dynamics of the aboveground, underground and total biomass of the alpine meadow grassland in the north shore of Qinghai Lake were studied from May to September, 2007. The result showed that the curve of seasonal dynamic of the aboveground biomass was single apex, the minimum biomass was at the initial growing period and the maximum in middle August, 223.0 g/m2. The distribution pattern of the underground biomass was ＂Inverted Pyramid＂ type. The underground biomass at the depth of 0--10, 10 20, 20 40 cm showed＂N＂ type from May to September, biomass at the depth of 0--10 cm accounted for to 650/40 of the total. The turnover value of the underground biomass was 0.45. The underground biomass accumulation were much larger than that of the aboveground in growing season, and the peak value of the underground biomass was earlier than that of the aboveground, the root/shoot ratio of the community showed a decrease first and followed by a increase, the average was 16.1.

关 键 词：生物量 季节动态 草句草原 青海湖北岸 

分 类 号：S812[农业科学—草业科学]