南阳盆地地区裸地土壤呼吸日变化特征

The variation characteristics of the bare soil respiration in the area of Nanyang basin

利用ACE(土壤呼吸自动监测仪)对南阳盆地地区裸地土壤呼吸进行日变化动态监测.研究结果表明,土壤呼吸日变化呈不对称的多峰状曲线,最大值和最小值在10:30~16:30之间波动,呈不稳定状态,白昼的起伏变化大于夜间.土壤呼吸速率最大值的出现时间与土壤表层温度不同步.土壤呼吸日变化主要受土壤温度、土壤水分、光合有效辐射等因子的影响,其中土壤温度和土壤水分对土壤呼吸速率的影响最大.

ACE( soil respiration automatic monitor) is used to monitor the daily variation of bare soil respiration dynamically in the area of Nanyang basin. The results show that the daily variation of soil respiration is an asymmetric multi-peak curve,the maximum value and the minimum value appear between 10: 30 am and 16: 30 pm,the curve is in a state of instability and the ups and downs of daytime are greater than the fluctuations of the night. The time of the emergence of the maximum soil respiration rate is not synchronized with the soil surface temperature. Daily variation of soil respiration is mainly affected by soil respiration,soil moisture,photosynthetic active radiation and other factors,in which the influence of the soil temperature and soil moisture on soil respiration rate is the largest.