干旱区生态环境知识资源中心(Arid): 农田土壤中N2O释放的水温特征研究

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	农田土壤中N2O释放的水温特征研究
其他题名	Characteristics of N2O Emissions from Farmland Responding to Water and Temperature
	韩建刚 1; 李占斌 2; 朱咏莉 2; 白红英 1; 李世清 1
来源期刊	土壤通报
ISSN	0564-3945
出版年	2004
卷号	35 期号:3 页码:285-289
中文摘要	室内模拟研究不同水热条件下土壤中N2O的释放特征,有助于阐明N2O释放的水热效应机理.本文通过室内试验研究了西北地区的典型耕种土壤()土中N2O在不同水温变化下的释放特征,借助化学反应动力学理论对其释放机理进行了初步的探讨.结果表明:10℃和30℃下,不同含水量的土壤中N2O的浓度变化随着培养时间的延长呈"S"型曲线.可用方程C=1/[A+Bexp(-t)]来描述.随着温度的升高(10℃到30℃),N2O释放的快速期,减速期,稳定期的启动时间明显提前.在较低的土壤湿度范围内(27%至58%wfps),土壤中N2O释放的稳定浓度与土壤湿度呈正相关;田间持水量(58%wfps)时,N2O释放的稳定浓度达到最大;超过田间持水量时,其逐渐变小.当土壤湿度从27%-42%wfps增加时,30℃下土壤中N2O释放的稳定浓度大于10℃下的;当土壤湿度等于或大于田间持水量(58%wfps)时,30℃下土壤中N2O释放的稳定浓度小于10℃下的.低温下(10℃)的风干土壤(8%wfps)存在吸收N2O的现象.不同水热条件下土壤硝化和反硝化过程中N2O释放的表观化学反应速率常数和对应活化能的大小决定了土壤中N2O的释放量及难易程度.
英文摘要	Model experiment provides possibilities for the study of N_2O emission from soil under different water and temperature regimes. Effects of water and temperature on the N_2O emission and the preliminary mechanism of the soil N_2O emission were studied in terms of the kinetic theory of chemical reactions in the Lou soil-a typically cultivated soil in arid and semiarid region in the Northwester of China. Results showed: the curve of soil N_2O concentration with incubation time under the different water regime is "S-shaped" and can be described by the equation C=1/[A+Bexp(-t)] when the incubation temperatures are lOt)and 30℃. The startup time of fast-stage, deceleration-stage and stable stage of soil N_2O emission were advanced clearly with the increase of incubation temperature from lO℃ to 30℃. The stable concentration of N_2O increased with the increase of soil water contents (from 27 to 58% wfps), and it became smaller gradually when water content was above the field water capacity. The highest concentration occurred at the field water capacity (58% wfps). The stable concentration at the 30℃ was higher than that at the ICC when the soil moisture varied from 27 to 42% wfps. However, the trend was opposite when water content was above the field water capacity (58% wfps). Also, the air-dried soil (8% wfps) could absorb N_2O weakly at the lower temperature (10℃). The apparent rate constant and activation energy of soil nitrification and denitrification process dominated the soil N_2O emission in the different water and temperature regime.
中文关键词	土婁土 ; N2O释放 ; 水热因子 ; 表观速率常数 ; 表观活化能
英文关键词	Lou Soil N_2O emission Water and temperature factors Apparent rate constant Apparent activation energy
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:1854948
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205543
作者单位	1.西北农林科技大学资源环境学院, 杨凌, 陕西 712100, 中国; 2.中国科学院、教育部水土保持与生态环境研究中心, 杨凌, 陕西 712100, 中国
推荐引用方式 GB/T 7714	韩建刚,李占斌,朱咏莉,等. 农田土壤中N2O释放的水温特征研究[J]. 西北农林科技大学,2004,35(3):285-289.
APA	韩建刚,李占斌,朱咏莉,白红英,&李世清.(2004).农田土壤中N2O释放的水温特征研究.土壤通报,35(3),285-289.
MLA	韩建刚,et al."农田土壤中N2O释放的水温特征研究".土壤通报 35.3(2004):285-289.