单 位：
甘肃省林业科学院;四川农业大学动物科技学院草业科学系
关键词：
若尔盖高寒湿地;土壤碳氮磷比;生态化学计量;鼠类密度;草地管理
摘 要：
以若尔盖花湖湿地保护区高寒草甸—高寒草原空间演替为研究对象,结合草地利用现状及微地形分布,遴选出5个高寒退化湿地类型进行鼠类洞穴密度和土壤碳、氮、磷含量的调查取样并进行相关性分析。结果表明,5个样地土壤表层(0~10cm)碳、氮平均含量分布范围分别为3.7%~4.9%和0.38%~0.56%,样地间差异不显著(P>0.05),磷元素含量由坡地区(样地Ⅰ、Ⅱ、Ⅲ)向平地区(样地Ⅳ、Ⅴ)呈递增趋势,差异性显著(P<0.05);0~40cm土壤碳氮比(C/N)为11.01,样地间差异不显著(P>0.05),碳磷比(C/P)为62.3、氮磷比(N/P)为5.69,样地间均差异显著(P<0.05);土壤碳、氮、磷含量及碳氮比、氮磷比均随土层加深呈降低趋势,其中有机碳含量减少4.36%,0~10cm表层土壤碳氮比显著高于深层土壤(P<0.05);鼠类洞穴密度与碳磷比、全磷具有极显著的正相关,而土层深度与所有碳、氮、磷化学计量特征都具有极显著的负相关性。研究结果将为鼠害防控及草地营养循环、碳源/汇转化机制、退化草地植被恢复、土壤养分管理提供理论依据。
译 名：
Analysis of soil carbon,nitrogen and phosphorus in degraded alpine wetland,Zoige,southwest China
作 者：
QING Ye;SUN Feida;LI Yong;CHEN Wenye;LI Xin;Department of Grassland Science,Sichuan Agicultural University;Gansu Forestry Science and Technology Research Academy;
关键词：
Zoige alpine wetland;;soil C∶N∶P;;ecological stoichiometry;;density of rodent;;grassland management
摘 要：
Based on their vegetation characteristics,5degraded alpine wetland plots were selected to investigate grassland degradation processes in the Huahu Scenic Area,Zoige County,in Southwest China.Pika(Ochotona curzoniae)burrow densities,soil carbon(C),nitrogen(N)and phosphorus(P)were measured(0-10 cm depth).The mean soil C and soil N content ranged from 3.7%-4.9% and 0.38%-0.56% respectively,but there were no differences among the plots.However,soil P was significantly higher in plots on the flat areas compared with plots on sloping ground.The soil C/N,C/P and N/P ratios were 11.0,62.3and 5.7,respectively.Carbon,N and P all decreased with increasing soil depth as did the C/N and N/P ratio.The C/P ratio was positively correlated with pika burrow density.The study was helpful for understanding the grassland nutrient cycling processes and for identifying pika control and wetland management strategies.
