稻鸭鱼共栖生态系统CH_4排放规律研究  

Methane emission from rice-duck-fish complex ecosystem

作　　者：刘小燕[1] 黄璜[2] 杨治平[2] 余建波[1] 戴振炎[1] 王德军[1] 谭泗桥[3] 

机构地区：[1]湖南农业大学动物科学技术学院 [2]湖南农业大学农学院 [3]湖南农业大学信息科学技术学院,湖南长沙410128

出　　处：《生态环境》2006年第2期265-269,共5页Ecology and Environmnet

基　　金：国家"863"项目(863-306-ZD05-3-E);国家自然科学基金项目(39670142);湖南省科技项目(NKY2001-01)

摘　　要：首次对稻-鸭-鱼共栖生态系统中的甲烷排放通量进行了系统研究。结果表明：甲烷排放通量日变化呈现一定的规律，排放高峰出现在下午14：00～16：00，晚上0：00～4：00达到最低值。稻-鸭-鱼共栖生态系统生态种养期间叫烷排放通量表现出一定的规律，甲烷排放出现2个峰值分别出现在水稻生长返青期、幼穗分化期，第1个峰值为15．813mg／（m^2·h），第2个峰值为9．485mg／（m^2·h）。其次在水稻分蘖盛期，甲烷的排放通最最高可达8．227mg／（m^2·h）。稻-鸭-鱼共栖生态系统中，土壤氧化还原电位增加10．98mV．还原物质总最、活性还原物质总昼分别降低1．46cmol／kg、1．25cmol／kg。稻田甲烷排放与土壤氧化还原电位呈极显著负相关，与还原物质总量、活性还原物质总量呈极显著正相关。A field experiment was used to investigate methane emission in rice-duck-fish complex ecosystem. The results showed that methane emission flux presented distinct diurnal and seasonal variations. Methane emission flux reached the highest peak from 14：00 to 16：00 pm, and the lowest value between 0：00 and 4：00 am. During dee growth period, the peaks of methane emission flux were observed in seeding establishment stage [15.81 mg/（m^2·h）]and in the young panicle differentiation stage [9.49 mg/（m^2·h）]. Eh value in rice-duck-fish complex ecosystem increased 10.98 mV compared with conventional flee fields, while total and active reduced substances decreased 1.46 cmol/kg and 1.25 cmol/kg, respectively. The methane emission flux was negatively correlated to soil Eh, but it was positively correlated to the amount of total and active reduced substances, The results indicate the possibility of reducing methane emission under rice-duck-fish complex ecosystem.

关 键 词：甲烷排放通量 稻鸭鱼共栖 生态系统 

分 类 号：X142[环境科学与工程—环境科学]