干旱区农田土壤呼吸与土壤温湿度的关系

目的]研究土壤温湿度对土壤呼吸的影响。方法]利用LI-cor8100土壤呼吸观测系统，连续观测2012年6月18~30日张掖绿洲农田的土壤呼吸速率和土壤温湿度；分析了土壤呼吸速率的日变化规律及土壤呼吸与土壤温湿度之间的关系；评价了现有的土壤呼吸模型。结果]张掖绿洲农田的土壤呼吸具有明显的日变化规律，该区域土壤呼吸速率与4 cm深度土壤温湿度的相关性最好；土壤呼吸速率与土壤温度之间的相关性要远远好于土壤呼吸速率与土壤水分之间的相关性。结论]在土壤呼吸模型中，同时考虑土壤温度和土壤水分的土壤呼吸模型的模拟结果要好于只考虑土壤温度或土壤水分的土壤呼吸模型。

Response of farmland Soil Respiration to Soil Temperature and Moisture in Arid Area

Objective] The aim was to study effects of soil temperature, moisture on soil respiration. Method] Using LI-cor8100 soil respi-ration observation system, farmland soil respiration rate and soil temperature, moisture in Zhangye Oasis was observed during Jun. 18-30 in 2012;the relationship between soil respiration rate daily variation law, soil respiration and soil temperature, moisture was analyzed; current soil respiration model was evaluated. Result] Farmland soil respiration in Zhangye Oasis had obvious daily variation law, the correlation be-tween soil respiration rate and soil temperature, moisture at 4 cm depth was best;the correlation between soil respiration rate and soil tempera-ture was greater than correlation between soil respiration rate and soil moisture. Conclusion] The simulation results of soil respiration model both considering soil temperature and soil moisture are better than the model only considering soil temperature or soil moisture.