稻鸭共作对甲烷排放的影响  

Effects of rice-duck farming on paddy field's methane emission

作　　者：展茗[1] 曹凑贵[1] 汪金平[1] 袁伟玲[1] 江洋[1] 高大伟[1] 

机构地区：[1]华中农业大学作物栽培与生理生态研究中心,武汉430070

出　　处：《应用生态学报》2008年第12期2666-2672,共7页Chinese Journal of Applied Ecology

基　　金：国家重大科技专项资助项目(2004BA520A02)

摘　　要：利用密闭箱技术,于2006和2007年研究了稻鸭复合系统CH4的排放规律及影响因素.结果表明:与常规淹水稻田(CK)相比,由于鸭子的活动,养鸭稻田(RD)的田面水溶解氧浓度(DO)增加,CH4的排放显著减少.2006年RD的平均CH4排放通量为(6.84±1.49)mg.m-2.h-1,比CK的(10.17±1.25)mg.m-2.h-1降低32.7,CH4排放总量为(19.34±1.15)g.m-2,比CK的(26.25±2.17)g.m-2减少26.3;2007年RD的平均CH4排放通量为(7.68±0.74)mg.m-2.h-1,比CK的(9.53±0.40)mg.m-2.h-1降低19.0,CH4排放总量为(18.41±1.05)g.m-2,比CK的(22.81±0.75)g.m-2减少19.3.在水稻全生育期,各处理CH4的排放通量分别在分蘖期和抽穗期出现2个排放高峰;CH4排放通量的季节变化与土壤温度和土壤水溶性有机碳含量呈显著正相关,但与土壤总有机碳含量相关不显著.Abstract ： By using closed-chamber technique, the characteristics of CH4 emission from an integrated rice-duck ecosystem were studied in 2006 and 2007. The results showed that comparing with conventional flooded rice ecosystem （CK）, integrated rice-duck system （RD） was distinguished in its high dissolved oxygen （DO） in field surface water and significantly lower CH4 emission, due to the activities of duck. In 2006, the average CH4 emission flux and the total CH4 emission during the whole rice growth period of RD were 6. 84 ±1.49 mg · m^-2· h^-1 and 19.34±1.15 g · m^-2, being 32.7% and 26.3% lower than those of CK （10. 17± 1.25 mg · m^-2 . h^-1 and 26.25 ±2. 17 g ·m^-2）, respectively; while in 2007, the values of the two test items of RD were 7.68 ±0. 74 mg ^m-2 ·h^-1 and 18.41±1.05 g·m^-2 , being 19.0% and 19.3% lower than those of CK （9.53 ±0. 40 mg · m^-2 · h^-1 and 22.81 ±0. 75 g · m^-2） , respectively. The emission flux of CH4 had two peaks, being appeared at tillering and heading stages, respectively. The seasonal fluctuations of CH4 emission flux had significant positive correlations with soil temperature and soil dissolved organie carbon eontent （DOC）, but no obvious correlation with soil total organic carbon.

关 键 词：稻鸭复合生态系统 甲烷 排放通量 

分 类 号：S181,S511[农业科学—农业基础科学]