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一种土壤剖面标准瞬时CO2通量的获取方法
发表时间：2010-09-30 浏览量：1734 下载量：709
| 全部作者： | 朱咏莉，吴沿友，李萍萍 |
| 作者单位： | 江苏大学现代农业装备与技术省部共建教育部重点实验室，江苏省现代农业装备与技术省重点实验室，江苏大学农业工程研究院 |
| 摘 要： | 采用红外CO2分析仪现场测定不同土层CO2浓度，根据测定时间内CO2浓度的变化规律，提出双曲线方程的拟合方法和以此为基础的标准瞬时CO2通量（简称标准通量）的计算方法。结果表明：随测定时间的变化，各土层CO2浓度均表现为先快后慢的非匀速增加趋势，该过程更适宜采用双曲线方程进行模拟，较常规线性拟合具有更高的相关性。基于双曲线模型计算的标准通量值明显高于常规线性模型得到的结果，并与相应土层温度具有显著相关性。因此，与常规通量的表示方法比较，标准通量可以有效避免线性拟合法计算通量值的低估问题，具有较高的可靠性。 |
| 关 键 词： | 农业工程；标准CO2通量；双曲线方程；土壤剖面 |
| Title： | A method for determining standard instantaneous CO2 efflux of soil profile |
| Author： | ZHU Yongli, WU Yanyou, LI Pingping |
| Organization： | Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education & Jiangsu Province, Jiangsu Provincial Key Laboratory of Modern Agricultural Equipment and Technology, Institute of Agricultural Engineering, Jiangsu University |
| Abstract： | Soil profile CO2 concentration was measured continuously by using infrared CO2 analyzer. According to the change of CO2 concentration with measurement time, a single rectangular model was used to simulate the process. And based on it, a soil profile standard CO2 efflux was put forward. The results showed that the soil CO2 concentration increased non-uniformly as fast followed by slow during the measurement time (t). Comparing with conventional linear model, the rectangular model had higher correlation coefficient values. Therefore it was confirmed that the rectangular model was more suitable for describing the relationship of CO2 concentration and the measurement time. The soil profile standard CO2 effluxes obtained by using rectangular model were higher than that obtained by linear model. And these standard values had higher correlation with soil temperatures. Consequently, soil profile standard CO2 effluxes had high reliability and could decrease the underestimate of that based on the linear model. |
| Key words： | agricultural engineering; standard CO2 efflux; rectangular regression model; soil profile |
| 发表期数： | 2010年9月第18期 |
| 引用格式： | 朱咏莉，吴沿友，李萍萍. 一种土壤剖面标准瞬时CO2通量的获取方法[J]. 中国科技论文在线精品论文，2010，3（18）：1847-1852. |
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