高寒草甸区不同生境土壤呼吸变化规律及其与水热因子的关系

Soil respiration variation and its relationship with hydrothermic factor under different biotopes of alpine meadow distributed area

采用野外定位观测的方法,于2012年6―9月在青海省海北地区分析了围栏封育地(对照)、放牧地、鼠丘和蚁塔地4种不同生境下土壤呼吸的变化规律及其与水热因子的关系。结果表明,1)各处理的土壤呼吸均表现出明显的季节动态,其变化程度大小依次表现为对照<鼠丘<放牧地<蚁塔。2)不同时期各处理下土壤呼吸表现为:除6月初、7月底外,鼠丘处理与封育和放牧处理差异不显著(P>0.05);蚁塔地与其他3个处理间差异均显著(P<0.05);除7月底外,放牧处理与对照间差异均不显著。3)土壤呼吸与土壤温度均呈正相关,且均存在较好的指数关系,其中对照处理的相关性最好,相关系数为0.851;封育地、放牧地、鼠丘、蚁塔的土壤呼吸Q10值依次为2.39、4.66、2.03、2.29。4)4处理的土壤含水量与土壤呼吸速率回归关系均不明显。

Based on field-orientation observation,soil respiration variations and its relationship of enclosure which is the control plot,and grazing land,mole-hills and ant-hills in different biotopes through the method of comparative analysis were analyzed in the Haibei region of Qinghai Province from June to September in 2012.The main results were as followed:1)Seasonal dynamics of each treatment were apparent,which was enclosure treatment<mole hill treatment<grazing treatment<ant tower treatment.2)Soil respiration in different months showed:differences of mole hill treatment and enclosure and grazing treatments were not significant in June and July;differences of ant tower and other treatments were significant(P<0.05)in other moths;difference of grazing treatment was not significant compared with enclosure treatment except the soil respiration in July.3)Soil respiration rate was positively correlated with soil temperature,and the most significant one was control treatment,the correlation coefficient of 0.851.The Q10were followed by 2.39,4.66,2.03and 2.29,respectively.4)There was no significant correlation between SRR and soil water content.