拉萨河谷山地灌丛草地优势种营养物质含量变化规律  

Changes in Nutrients of Dominant Species on Montane Shrub Grassland in the Lhasa River Basin

作　　者：张晓庆[1] 罗黎鸣[2] 金艳梅[3] 张雅莉[3] 潘影[4] 武俊喜[4] 

机构地区：[1]中国农业科学院草原研究所/农业部草地生态与修复治理重点实验室,内蒙古呼和浩特010010 [2]西藏农牧科学院草业科学研究所,西藏拉萨850009 [3]山东大学(威海)海洋学院,山东威海264209 [4]中国科学院地理科学与资源研究所,北京100101

出　　处：《中国草地学报》2017年第3期90-95,共6页Chinese Journal of Grassland

基　　金：国家自然科学基金项目(31402119);西藏自治区科技成果转化/示范项目;中科院科技服务STS计划课题(KFJ-EW-STS-072);中央级公益性科研院所基本科研业务费专项(1610332016015)

摘　　要：对拉萨河谷不同海拔山地灌丛草地优势种营养物质含量的变化规律进行了研究,结果表明:优势种营养物质含量随海拔高度的增加而变化,高山嵩草、白尖苔草的粗蛋白质含量最高,丝颖针茅的中性洗涤纤维、酸性洗涤纤维含量最高,但其粗蛋白质和可溶性糖含量在6种优势种中最低,雪层杜鹃、樱草杜鹃的可溶性糖含量最高、但其灰分、粗脂肪含量最低,喜马拉雅草沙蚕的灰分含量最高。随海拔高度的增加,山地灌丛草地优势种的中性洗涤纤维、酸性洗涤纤维和灰分含量降低,可溶性糖含量随海拔升高而增加,粗脂肪含量随海拔升高呈先升高后降低的"单峰曲线"变化趋势,而粗蛋白质含量呈先降低后升高的"U"型变化趋势。The changes in nutrients of dominant species on the montane shrub grassland in the Lhasa River Basin were investigated. The results showed that nutrients of the dominant species changed with dif- ferential altitude, the highest crude protein （CP） content was found in Kobresia pygrnaea and Carex atro- fusca among those six species. The contents of neutral detergent fiber （NDF） and acid detergent fiber （ADF） in Stipa capiIlacea were higher, but its CP and water soluble carbohydrate （WSC） contents were the lowest among those six species. The soluble sugar content in Rhododendron nivale and Rhododendron primulaeflorum was the highest, but the ash and ether extract （EE） contents were the lowest. Ash con- tent was higher in Tripogon hookerianus than that in the other species. There were negative relationships between altitude and NDF, ADF and ash contents, but a positive relationship was observed in WSC content. The crude fat content increased first then decreased with altitude increasing, which showed ＇single peak curve＇ change trend, CP content decreased first then increased with altitude increasing, which showed ‘U＇ change trend.

关 键 词：西藏 山地灌丛草地 优势种 海拔 营养物质 

分 类 号：S812.8[农业科学—草业科学]