生态环境学报Issue(5)：804-810,7.DOI:10.16258/j.cnki.1674-5906.2015.05.013
辽河三角洲稻区近地层CH4浓度与通量特征
The Characteristics of CH4 Concentration and Flux of the near Surface in Liaohe Delta Rice Region
摘要
Abstract
In order to obtain accurately the characteristics of near surface CH4 concentration and flux in paddy field of the Liaohe Delta region, analyze the impacts of rice growth on CH4 concentration and flux and estimate the CH4 emissions of rice region, characteristics of CH4 concentration and flux during April and October of 2013 were analyzed by an eddy covariance method. The results indicate that the mean CH4 concentration near surface level is 0.242 mmol·m-3 in the rice (Oryza sativa Linn) growing season, and there are three peaks during this period, which are corresponding to the ponding, jointing-heading and maturity stages respectively. When the CH4 concentration is high, its diurnal variation is active, namely, its concentration is lower in daytime and higher in nighttime and diurnal concentration range is large, while its diurnal variation is inactive when the CH4 concentration is low. The monthly CH4 emission is largest in May, which is 0.700 mol·m-2. The daily mean CH4 flux is 0.080 μmol·m-2·s-1 during the growing season, and its variation rules are consistent with those of concentration. The CH4 flux over ponding stage is large, and the maximum is 0.707μmol·m-2·s-1 on May 11;there is nearly no CH4 emission during turning green-tillering stage, and then the CH4 emission rises again during jointing-heading stage, and the emission decreases gradually after that stage. When the CH4 flux is large, its diurnal variation rises with the increase of temperature and reaches the maximum value, and then decreases. There is a negative correlation between CH4 concentration and flux.关键词
辽河三角洲/水稻/甲烷/浓度/通量Key words
Liaohe Delta/rice/CH4/concentration/flux分类
资源环境引用本文复制引用
贾庆宇,刘晶淼,梁成华,刘国飞,谢艳兵,于文颖,王笑影,吕国红,温日红..辽河三角洲稻区近地层CH4浓度与通量特征[J].生态环境学报,2015,(5):804-810,7.基金项目
国家自然科学基金项目（31270480；41375146；41405109）；国家重点基础研究发展规划（973）项目 （）
