摘要
采用大田试验方法,研究了常规灌溉和持续淹水条件以及不同水平有机质(小麦秸秆)投放量(0、2.25、4.5t·hm-2)条件下各环境因素(包括土壤温度、灌溉水层深度和土壤Eh)对CH4和N2O排放的影响以及水稻生长与CH4排放的关系。结果表明,在2种水分管理下,CH4的累积排放量均与水稻冠层高度呈显著正相关(P<0.001)。连续淹水条件下,无论有无外源有机质投放,稻田CH4排放的季节性变化均与土壤温度呈指数相关(P<0.001),而N2O排放的季节性变化则仅取决于土壤水分条件。
To investigate impact of environmental factors and crop- growing on CH4 and N2O emissions, a field experiment with different levels of organic matter application under conditions of normal irrigation and permanent flooding was performed at a county of Jiangning near Nanjing during 2000 rice- growing season. Field measurements in rice- growing season showed that under two water regimes the accumulative CH4 emission was positively related to rice canopy height (P<0.001); The seasonal variation of CH4 emissions from permanent flooding plots were mostly depended on soil temperature. Further analysis of methane fluxes against soil temperature demonstrated that the seasonal courses of methane emissions under 0, 2.25 and 4.5 t· hm- 2 levels of organic matter application in Nanjing were mainly attributed to soil temperature changes, which can be quantitatively described by three exponential functions (P<0.001), respectively. In contrast, N2O emission was only dependent on soil moisture changes.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2003年第6期711-714,共4页
Journal of Agro-Environment Science
基金
中国科学院大气物理所大气边界层物理和大气化学国家重点实验室(LAPC)开放课题(LAPC-KF-2002-04)
中国科学院"百人计划"项目
