论文部分内容阅读
以新疆维吾尔自治区天山中部巴音布鲁克天鹅湖高寒湿地为研究区域,结合室内水位控制试验,初探土壤水位对土壤呼吸的影响,结果表明:1)土壤呼吸与土壤水位呈现显著的负相关性(r=-0.997;p=0.003),5cm、0cm、-10cm、-20cm水位梯度下土壤呼吸速率平均值分别为1.27、2.49、4.60、6.21μmol·m~(-2)·s~(-1)。2)不同水位处理下土壤碳排放量差异性达到极显著水平(p<0.01),5cm、0cm、-10cm、-20cm水位条件下土壤碳排放量分别为0.11、0.22、0.40、0.54mol·m~(-2)·d~(-1)。3)不同水位条件下土壤呼吸速率与5cm土壤温度均表现为显著正相关关系,淹水条件下水温与土壤呼吸速率表现为显著正相关性,且随着土壤水位的下降水温与土壤呼吸的相关性系数减弱。各水位梯度土壤呼吸速率与5cm土壤温度均呈显著的指数函数关系,水位降低显著提高了土壤呼吸温度敏感性系数(Q10)(p<0.05)。
Taking alpine wetland of Bayanbuluke Lake Swan Lake in central Tianshan of Xinjiang Uygur Autonomous Region as study area, this paper studied the effect of soil water level on soil respiration with the control of indoor water level. The results showed that: 1) soil respiration had a significant negative correlation with soil water level (r = -0.997; p = 0.003). The mean values of soil respiration rate under 5 cm, 0 cm, -10 cm and -20 cm water level gradients were 1.27, 2.49, 4.60 and 2.21 μmol · m -2 · s -1 . 2) The soil carbon emissions at different water levels reached a significant level (p <0.01). Soil carbon emissions at the water level of 5 cm, 0 cm, -10 cm and -20 cm were 0.11, 0.22, 0.40 and 0.54 mol m ~ (-2) · d ~ (-1). 3) There was a significant positive correlation between soil respiration rate and soil temperature at 5 cm under different water levels. Water temperature and soil respiration rate showed a significant positive correlation under flooding conditions. With the decrease of soil water level and soil respiration Weakened sexual coefficient. The soil respiration rate at each water level gradient showed a significant exponential function with 5 cm soil temperature. The decrease of water level significantly increased the soil respiration temperature sensitivity coefficient (Q10) (p <0.05).