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在田间开放式空气条件下模拟未来50年后气候变化的情况,包括大气温度升高(T)和CO2浓度升高(FACE)以及二者同时升高(FACE+T)对稻麦轮作生态系统稻田土壤剖面温室气体甲烷(CH4)分布的影响。通过田间小区试验,运用土壤剖面气体原位采集系统周年观测,研究CH4在水稻-小麦轮作周期淹水或排水状态下4个不同土壤层次(0~7cm,7~15cm,15~30cm,30~50cm)的行为特征。研究表明:各处理的不同土壤剖面CH4的动态变化趋势相同;水稻生长季CH4浓度随着土层深度的增加而减少,各土壤剖面CH4平均浓度显著高于小麦生长期;小麦生长季CH4浓度则随着土层深度的增加而增加,而且降水显著增加了该季表层CH4浓度。与对照(CK)相比,气候变化的3个处理(FACE、T、FACE+T)均显著增加了土壤剖面各层次的CH4浓度(P<0.05),其中T处理7cm处CH4的平均浓度最高。
Simulation of climate change over the next 50 years under open field conditions in the open field, including increased atmospheric temperature (T) and elevated CO2 (FACE) and simultaneous increase of both (FACE + T) Effect of Greenhouse Gas Methane (CH4) Distribution in Paddy Soil Profile. Through the field plot experiment and the annual observation of the gas in situ sampling system of the soil profile, the effects of CH4 on four different soil layers (0 ~ 7cm, 7 ~ 15cm, 15 ~ 30cm, 30 ~ 50cm) behavioral characteristics. The results showed that the dynamic changes of CH4 in different soil profiles were the same. The CH4 concentration decreased with the increase of soil depth during the growing season, and the average concentration of CH4 in each soil profile was significantly higher than that of wheat. The CH4 concentration in the growing season With the increase of soil depth, the precipitation increased the surface CH4 concentration significantly. Compared with the control (CK), the three treatments of climate change (FACE, T, FACE + T) significantly increased CH4 concentrations at all levels of the soil profile (P <0.05), with the highest concentration of CH4 at 7 cm .