马尾松林土壤呼吸对去除和添加凋落物处理的响应

Response of Soil Respirations to Litterfall Exclusion and Addition in Pinus massoniana Plantation in Hunan,China

2007年1—12月,在长沙天际岭国家森林公园,研究马尾松人工林土壤呼吸速率对去除和添加凋落物处理的响应。结果表明:去除、添加凋落物处理和对照的土壤呼吸速率均呈现出显著的季节性变化(P<0.001),3者曲线格局相似,土壤呼吸速率的范围分别为34.45～321.16、61.26～649.44和38.6～466.49mgCO2.m-2h-1,年平均值分别为175.18,310.36和234.97mgCO2.m-2h-1。去除和添加凋落物分别使土壤呼吸速率降低24.96%和提高27.36%。去除、添加凋落物和对照的土壤呼吸Q10值分别为2.16,2.56和2.13,均表现出夏季最小,秋、冬季高的特点。

We evaluated the impact of litterfall on soil respiration under a Pinus massoniana plantation in Tianjiling National Forest Park of Changsha, Hunan, using a field study with litterfall exclusion and addition in a full factorial design. Soil respiration was measured using an infrared gas exchange analyzer （LI-COR 6400 - 09） from January to December 2007. There was similar respiration curve with seasons between litterfall exclusion and addition treatment and the control. Soil respiration rate ranges of litterfall exclusion, litterfall addition and control were 34.45 - 321.16,61.26 - 649.44 and 38.6 - 466.49 mgCO2 · m^-2h^-1, respectively. The annual mean soil respiration rates were 175.18,310.36 and 234.97 mgCO2· m^-2 h^-1, respectively. On average, soil respiration was significantly decreased by litter exclusion, about 24.96 % lower to control in Pinus massoniana plantation. On the other hand, litter addition significantly increased soil respiration by 27.36 % in Pinus massoniana plantation compared with the control. The Q10 values of the soil respiration in litter exclusion, litter addition and the control plots were respectively 2.16, 2.56 and 2.13.