作 者：
刘英;曹生奎;曹广超;陈克龙;兰垚;汉光昭;杨羽帆;雷义珍
单 位：
青海师范大学地理科学学院;青海师范大学青海省自然地理与环境过程重点实验室
关键词：
青海湖;高寒湿地;土壤碳氮;化学计量特征
摘 要：
【目的】植物生长发育离不开碳、氮元素,并且还可通过对碳的同化和氮的吸收去推动地球化学循环过程。以青海湖湖滨和河源2种高寒湿地土壤为研究对象,对其碳氮计量特征进行了研究,拟揭示不同高寒湿地土壤碳氮分布及其计量特点。【方法】于2017年6-9月,在青海湖流域东部的湖滨湿地与北部的河源湿地采集132个土壤样品,测定土壤全碳(TC)、全氮(TN)、有机碳(SOC)、pH值、电导率(EC),并计算土壤含水量(SWC)、土壤容重。利用单因素方差法对研究区两种高寒湿地土壤C/N比在不同土层间的差异进行了分析,利用相关分析法对土壤碳氮化学计量特征与土壤环境属性进行了分析。【结果】①2种高寒湿地土壤全碳(TC)和全氮(TN)含量均随土壤深度呈递减趋势变化;TC和TN含量在0～10 cm土层中最大。湖滨湿地土壤的TC和TN含量均低于河源湿地,湖滨湿地土壤的TC和TN含量分别为114.59和6.98 g·kg~(-1),河源湿地为137.42和10.48 g·kg~(-1);②2种高寒湿地土壤C/N随土壤深度的增加呈递增趋势变化,在20 cm下增幅较快。湖滨湿地C/N均值为16.95,河源湿地为13.42;③6-9月,湖滨湿地土壤TN、TC含量在月份上的变化特征为6月>9月>7月>8月,河源湿地为9月>6月>7月>8月;④2种高寒湿地土壤TC、TN含量的变化受土层深度、土壤含水量(SWC)、pH、容重影响,其中土壤含水量(SWC)是最大影响因子。【结论】青海湖2种高寒湿地土壤都有碳多氮少的特点,土壤平均C/N均高于我国土壤平均C/N,低于我国湿地土壤平均C/N。
译 名：
Comparative Study on Soil Carbon and Nitrogen Stoichiometry in Two Alpine Wetlands of Qinghai Lake
作 者：
LIU Ying;CAO Sheng-kui;CAO Guang-chao;CHEN Ke-long;LAN Yao;HAN Guang-zhao;YANG Yu-fan;LEI Yi-zhen;School of Geographical Science of Qinghai Normal University;Qinghai Province Key Laboratory of Physical Geography and Environmental Process;
关键词：
Qinghai lake;;Alpine wetland;;Soil carbon and nitrogen;;Stoichiometric characteristics
摘 要：
【Objective】Plant growth and development are inseparable from carbon and nitrogen, and can also promote the geochemical cycle through carbon assimilation and nitrogen absorption. Taking the two alpine wetland soils of Qinghai lakeside and river-head as the research objects, the carbon and nitrogen measurement characteristics were studied to reveal the distribution of carbon and nitrogen in different alpine wetlands and its measurement characteristics.【Method】From June to September 2017, 132 soil samples were collected in the lakeside wetland in the east of Qinghai lake basin and the river-head wetland in the north of Qinghai lake basin. Soil total carbon(TC), total nitrogen(TN), organic carbon(SOC), pH value and electrical conductivity(EC) were measured, and soil moisture content(SWC) and soil bulk density were calculated.The one-way variance method was used to analyze the difference of soil C/N between different soil layers in the two alpine wetland soils, while pearson correlation analysis method was used to analyze the correlation between soil carbon and nitrogen stoichiometry and soil environmental attributes. 【Result】The results showed that the contents of soil total carbon(TC) and total nitrogen(TN) in the two alpine wetlands decreased with soil depth. The TC and TN contents were the largest at 0-10 cm. The TC and TN contents were lower in the lakeside wetland soil than in the river-head wetland. The average TC contents were 114.59 and 137.42 g·kg~(-1), respectively, while the average TN contents were 6.98 and 10.48 g·kg~(-1), respectively. The C/N of the two alpine wetland soils increased with soil depth, which increased faster below depth of 20 cm. The average of C/N in the lakeside wetland was 16.95 and 13.42 in the river-head wetland. From June to September, the changes of TN and TC contents in the wetland of lakeside were characterized by June>September>July>August, and river-head wetland was September>June>July>August. The changes of soil C and N stoichiometric characteristics in two alpine wetlands were related to soil depth, soil water content(SWC), pH and bulk density, of which SWC was the greatest influencing factor. 【Conclusion】Both alpine wetland soils of Qinghai lake had the characteristics of more carbon and less nitrogen. The average C/N of the soil was higher than that of soils in China, and lower than that of wetlands in China.
