西双版纳山地三种土地利用方式的旱季土壤呼吸

为了解西双版纳山地不同土地利用方式土壤呼吸旱季变化特征，本研究对古树茶园、台地茶园和次生林中土壤呼吸速率及其相关因素进行定位观测。结论如下：三种土地利用方式土壤呼吸速率日变化有显著的差异性（P<0.05）；土壤呼吸速率日最高值大多出现在14∶00-16∶00；旱雨季交错期是土壤呼吸速率和土壤湿度变化最剧烈的阶段；土壤呼吸速率日均值表现为古树茶园（2.62μmol·m-2s-1）<台地茶园（2.73μmol·m-2s-1）<次生林（3.01μmol·m-2s-1）；土壤湿度过高和过低都会阻碍土壤呼吸的进行；三种土地利用方式土壤呼吸速率均与土壤湿度(0~10cm)和空气日均温具有相关关系；降水会引起土壤呼吸较大的波动。

Soil Respiration under Three Land-use Categories of Mountainous Region in Xishuangbanna, Yunnan

In order to study the difference of the soil respiration under different land-uses in Xishuangbanna, field observations were conducted on the soil respiration rate from November 2010 to May 2011 under forest tea plantations, terrace tea plantations and secondary forests. Daily variations of soil respiration and its influence factors were analyzed. The results showed that there are different daily-change patterns of soil respiration rate and soil moisture under different land-uses, with statistically insignificance of soil respiration rate (P<0.05). The daily maximum soil respiration rate is almost at 14 ∶ 00-16 ∶ 00. The soil respiration rate and soil moisture vary most during the dry- rainy transition season. The average soil respiration rate: forest tea plantations (2.62 μmol · m-2s-1)