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本文根据碱溶液吸收法 ,对西安地区不同植被条件下土壤 CO2释放量进行了昼夜观测。观测资料显示 ,西安地区 4月份土壤 CO2 释放量在一昼夜内具有明显的变化 ,从当日上午到次日上午 ,CO2 释放量表现出由低变高再变低的规律。土壤 CO2 释放量变化与温度变化具有相同的特征 ,但释放量的变化具有滞后性 ,相对于温度的变化滞后 4～7h左右。不同植被条件下 ,土壤 CO2 释放量不同 ,林地释放量大于草地 ,草地释放量大于裸地。夜间 12 h释放量大于白天 12 h释放量
In this paper, according to the alkali solution absorption method, the CO2 emission of soil under different vegetation conditions in Xi’an was observed day and night. Observational data show that in April, the amount of soil CO2 emission in Xi’an had a significant change in a day and night. From the morning of the morning to the next morning, the CO2 emission showed a pattern of low to high and then low. Soil CO2 emission and temperature changes have the same characteristics, but the release of the change has a hysteresis, relative to the temperature lag about 4 ~ 7h. Under different vegetation conditions, the amount of soil CO2 emission was different, and the amount of woodland released was greater than that of grassland, and the amount of grassland released was larger than that of bare land. 12 h at night release greater than 12 h during the day release