相思人工林土壤呼吸及残差呼吸的季节格局

采用红外气体分析(IRGA)法对平和天马国有林场3种相思人工林的土壤呼吸进行1 a的野外定位观测.结果表明,在3种相思人工林中,土壤呼吸的季节格局与土壤温度基本一致,呈明显的单峰曲线.卷荚相思林、黑木相思林和马占相思林土壤呼吸速率年平均值分别为3.51、2.73和3.36 μmol·m-2·s-1；土壤呼吸的Q,o值的...

Seasonal patterns of soil respiration and residual respiration at the base of temperature models in three Acacia artificial forests

Soil respiration of three artificial forests of Acacia Mill.in Tianma National Forest Station was measured in this research by using an open-flow gas exchange system with an infrared gas analysis method over the whole year.It was discovered that the seasonal patterns of soil respiration were mostly consistent with the soil temperature,which was depicted a single peak with the maximum in summer and the minimum in winter.Annually average soil respiration rates of A.cincinnata F.Muell.forest,A.melanoxylon R.Br.forest and A.magium Willd.forest were 3.51,2.73 and 3.36 μmol·m-2·s-1,respectively.The order of Q10 value of soil respiration was A.mangiun forest>A.cincinnata forest>A.melanoxylon forest.The lowest residual respirations were found in three Acacia artificial forests in winter,but negative residual respiration was found in spring and July,while positive in August and September.