若尔盖不同地下水位泥炭湿地土壤有机碳和全氮分布规律  

Distribution patterns of soil organic carbon and total nitrogen in Zoige peat land with different ground water table

作　　者：李丽[1,2] 高俊琴[1] 雷光春[1] 吕偲[1] 索郎夺尔基 

机构地区：[1]北京林业大学自然保护区学院,北京100083 [2]中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085 [3]若尔盖湿地国家级自然保护区管理局,四川若尔盖624500

出　　处：《生态学杂志》2011年第11期2449-2455,共7页Chinese Journal of Ecology

基　　金：国家林业局公益项目(200804005);国家基础研究规划项目(2009CB421103)资助

摘　　要：以若尔盖典型泥炭湿地为研究对象,选择不同地下水位的样地,对各样地不同土壤剖面的土壤有机碳含量、全氮含量的分布规律及土壤容重、pH等影响因素进行了研究。结果表明:0～50cm土层范围内,土壤有机碳含量和全氮含量与地下水位呈指数相关,随着水位的降低,土壤有机碳含量和全氮含量减少,且变异系数呈显著增加趋势,表明泥炭地排水、降低地下水位是泥炭地土壤有机碳和全氮丧失的重要原因。土壤有机碳和全氮含量间存在显著正相关,但与土壤pH和容重均呈极显著负相关。4个水位梯度下的土壤碳氮比的变动幅度在15.76～18.16,相对较低,表明在若尔盖气候条件下有机碳的分解速度较慢,而土壤碳氮比并没有受到地下水位和pH值的显著影响。Taking the typical peat land in Zoige National Nature Reserve at the eastern edge of Qinghai-Tibet Plateau as test object, four sites with different ground water tables were selected in summer 2009 to study the distribution patterns of organic carbon and total nitrogen in soil profile （0-50 cm）, aimed to understand the effects of underground water table fluctuation on peat land soil carbon and nitrogen. In the soil profiles, both the organic carbon and the total nitrogen decreased exponentially with decreasing ground water table, and the coefficient of variation presented an increasing trend, implying that the decrease of ground water table was the main cause of the losses of soil carbon and nitrogen. There was a significant positive correlation between soil organic carbon and soil total nitrogen, and the two of them were significantly negatively correlated with soil pH and soil bulk density. The soil C/N ratio at the four sites had a small variation （from 15.76 to 18.16）, implying low decomposition rate of soil organic carbon under the plateau climate and little effects of ground water table and soil pH on the soil C/N ratio.

关 键 词：若尔盖 地下水位 土壤有机碳 土壤全氮 分布规律 

分 类 号：S153.6[农业科学—土壤学]