Position: Home > Articles > The Indicative Function of N∶P Stoichiometry Characteristics on the Nutrient Limitation on the Sub-alpine Grassland
Chinese Journal of Grassland
2014,36
(3)
79-83
植物N∶P化学计量特征对亚高寒草甸限制类型的指示作用研究
作 者：
张仁懿;徐当会;杨智永;杨莹博;王刚
单 位：
兰州大学生命科学学院/草地与农业生态系统国家重点实验室
关键词：
N∶P化学计量学;亚高寒草甸;氮限制;N、P添加
摘 要：
通过对青藏高原亚高寒草甸自然植被的取样调查以及N、P添加试验,分析群落水平的植物N∶P化学计量特征,讨论了植物N∶P化学计量特征对亚高寒草甸养分限制类型的指示作用。添加试验结果显示,N添加以及N+P添加显著增加生物量,而P添加降低群落生物量,表明亚高寒草甸植被限制类型主要为N限制。2008、2009年群落N∶P比分别为11.57、9.83,低N∶P比值验证了该地区的N限制类型。两年群落N含量分别为20.34mg/g和16.03mg/g,高于前人提出的N限制临界值13mg/g;群落N-P散点落于标准曲线P%=0.15+0.065N%之下。综上所述,低群落N∶P比正确指示亚高寒草甸主要为N限制,而湿地生态系统的N、P临界值以及最佳N-P标准曲线不能有效地预测该地区的养分限制类型。
译 名：
The Indicative Function of N∶P Stoichiometry Characteristics on the Nutrient Limitation on the Sub-alpine Grassland
作 者：
ZHANG Ren-yi;XU Dang-hui;YANG Zhi-yong;YANG Ying-bo;WANG Gang;State Key Laboratory of Grassland and Agro-Ecosystems,School of Life Sciences,Lanzhou University;
关键词：
N∶P stoichiometry;;Sub-alpine meadow;;N-limitation;;N and P addition
摘 要：
In order to determine the indicative function of plant N(Nitrogen)∶P(Phosphorus)stoichiometry characteristics on the nutrient status,the effect of N-P additions on the aboveground biomass and the N∶P stoichiometry characteristics of natural community on the sub-alpine grassland located in northeast of Qinghai-Tibet Plateau were examined.The results showed that N and N+P addition promoted aboveground biomass while P addition inhibited it,which suggested the grassland was mainly N-limited.The N∶P ratios of community in 2008 and 2009 were 11.57 and 9.83 respectively,confirming the Nlimitation in the area.The N contents of community in 2008 and 2009 were 20.34mg/g and 16.03mg/g respectively,which were higher than the critical value 13mg/g.The N-P plots were also below the critical curve(P% =0.15+0.065N%)proposed from lowlands.In summary,the low N∶P ratio indicated the N-limitation properly for the sub-alpine grassland,while the critical value of N content and the critical curve of optimal N-P still need to be discussed.
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