放牧强度对高寒草甸植物叶片生态化学计量特征的影响  

Effects of Grazing Intensity on Ecostoichiometric Characteristics of Plant leaves in Alpine Meadow

作　　者：高巧静 朱文琰[2] 侯将将 王娅琳 赵新全[3] 徐世晓[3] 孙平[1] GAO Qiao-jing;ZHU Wen-yan;HOU Jiang-jiang;WANG Ya-lin;ZHAO Xin-quan;XU Shi-xiao;SUN Ping(College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471003,China;Forestry College, Henan University of Science and Technology, Luoyang 471003, China;Northwest Institute of Plateau Biology Chinese academy of Sciences, Xining 810008,China)

机构地区：[1]河南科技大学动物科技学院,河南洛阳471003 [2]河南科技大学林学院,河南洛阳471003 [3]中国科学院西北高原生物研究所,青海西宁810008

出　　处：《中国草地学报》2019年第3期45-50,共6页Chinese Journal of Grassland

基　　金：“十二五”国家科技支撑计划项目(2014BAC05B04-04);河南科技大学SRTP项目(2017315)

摘　　要：在青藏高原高寒草甸封育、适度放牧、重度放牧3种放牧强度中,选取并测定了异针茅、麻花艽、蒲公英3种植物叶片中C、N、P的含量,探讨了植物叶片的化学计量特征对不同放牧强度的响应机制。结果表明:3种植物叶片在不同放牧强度样地中C含量无差异;3种植物叶片N、P含量在重度放牧草地中高于其他两种放牧强度,且重度放牧草地整体受N限制,其他两种草地植物受P限制;重度放牧草地的C/P、N/P比值显著低于其他两种草地放牧强度中的比值,说明重度放牧草地3种植物采取了快速生长策略,而且不同物种在不同生境中受养分限制的程度不同。以上结果说明草地的放牧强度不同,在很大程度上间接改变植物对养分的利用状况,不同植物对相同生境有不同的适应策略。The leaves of Stipa aliena, Gentiana straminea and Taraxacum mongolicum were selected on the enclosed grassland, moderate grazing grassland and heavy grazing grassland in the alpine meadow of Qinghai-Tibet Plateau. The contents of C, N and P in these three plants’ leaves were determined, focusing on the response mechanism of the stoichiometric characteristics to different grazing patterns. The results showed that there were no difference in C content between the three plant species in diverse grazing patterns. The N and P contents of the three plants were higher than those of the other two grazing patterns in the heavy grazing grassland. The heavy grazing grassland was restricted by N, while the other two grassland plants were restricted by P. The ratio of C/P and N/P in heavy grazing grassland was significantly lower than that in the other two grassland grazing patterns, indicating that the three plant species in heavy grazing grassland adopted a rapid growth strategy, and different plants were different. The extent of nutrient limitation in habitats varies. The above results indicate that the grazing patterns of grassland are different, which indirectly changes the utilization of nutrients by plants, and different plants have different adaptation strategies for the same habitat.

关 键 词：高寒草甸 放牧强度 化学计量特征 

分 类 号：S812[农业科学—草业科学]