若尔盖高寒退化湿地土壤碳氮磷比及相关性分析

doi:10.11686/cyxb20150304

摘要/Abstract

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(0～10 cm)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);0~40 cm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%，0～10 cm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。

Abstract: Based on their vegetation characteristics, 5 degraded 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, 62.3 and 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.

青烨，孙飞达，李勇，陈文业，李昕. 若尔盖高寒退化湿地土壤碳氮磷比及相关性分析[J]. 草业学报, 2015, 24(3): 38-47.

QING Ye, SUN Feida, LI Yong, CHEN Wenye, LI Xin. Analysis of soil carbon, nitrogen and phosphorus in degraded alpine wetland, Zoige, southwest China[J]. Acta Prataculturae Sinica, 2015, 24(3): 38-47.

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