青藏高原东缘草地生态系统动态定位监测与可持续发展要素研究 Ⅰ8个主要草地类型植物量与营养动态的研究  

Studies on dynamics monitor and sustainable development in eastern edge of Qinghai-Tibetan alpine 3/grassland-grass biomass and nutritive dynamics in 8 main grassland types

作　　者：赵忠[1] 王安禄 马海生[1] 宋慧琴[1] 

机构地区：[1]甘肃省畜牧科技开发中心,甘肃兰州730030 [2]甘肃省碌曲县畜牧局,甘肃碌曲747200

出　　处：《草业科学》2002年第5期6-13,共8页Pratacultural Science

基　　金：甘肃省畜牧科技计划项目 (GMK2 0 0 1 12 )

摘　　要：通过对青藏高原东缘甘南碌曲草地最具代表性的披碱草—矮嵩草草地、异针茅—线叶嵩草 +密生苔草草地、金露梅—嵩草草地、藏嵩草 +裸果扁穗苔草草地、珠芽蓼 +线叶嵩草草地、高山柳—嵩草草地、窄叶鲜卑花—嵩草草地和短柄草—密生苔草草地等 8个草地类型群落植物量动态进行的连续 3年定位监测 ,分析研究结果表明 :地上植物量累积动态均符合Logistic曲线 ,衰减动态符合 y=a +b x模式。 6～ 7月是草群地上植物量累积的盛期 ,产量高峰出现在 8月中旬 ;水、热是制约草地初级生产力的主导环境因子 ;草群粗蛋白、粗脂肪、粗纤维含量与生长季节密切相关 ,DE。Dynamics of grass biomass was monitored and measured during continuous 3 years on 8 representative grassland types in eastern edge of Qinghai Tibetan alpine grassland, which were Elymus nutans Kobresia humilistype, Stipa aliena K. capillifolia + Carex crebratype, Pentaphylloides fruticosa K. bellardiitype, K. tibetica+C. coriophoratype, Polygonum viviparum+ K. capillifoliatype, Salix cuplaris - K. capillifoliatype, Sibiraea angustata- K. capillifoliatype and Brachypodium sylvaticum -Carex crebratype. The results showed that the dynamics of accumulated grass biomass above-ground was accorded with the Logistic curve line, the dynamics of decline was accorded with Y=a+bX model. June to July were best time of biomass accumulation. However, the top yield was appeared in late August. Water and temperature were dominant factors affecting the primary productivity. The contents of course protein, course fiber and course fat were closely related to growing seasons. The trends of DE and NND were similar to those of plant biomass.

关 键 词：青藏高原 草地 生态系统 动态定位监测 可持续发展 

分 类 号：S812[农业科学—草业科学]