中文摘要：

基于2008年12月初至翌年6月初绿篱-冬小麦复合系统土壤CO2全生长季的观测,研究了绿篱复合种植及其枝叶不同还田（移出/AR、翻施/AI和表施/AC）方式下土壤CO2的排放特征。结果表明,整个冬小麦生长期间,各处理土壤CO2排放具有相似的季节变化趋势,小麦生长旺盛期明显高于越冬期和成熟期。绿篱复合种植及其枝叶还田显著影响土壤CO2排放,与作物单作（CK）处理相比,AR处理土壤CO2平均排放通量降低了9.07%,而AI和AC处理分别增加了35.70%和8.42%。土壤温度、作物生长及土壤微生物生物量碳是影响土壤CO2排放的主要因素。土壤CO2排放通量与土壤温度呈显著或极显著指数正相关,其中与10 cm处土壤温度的相关性最高;同时,土壤CO2排放与0~5 cm土层微生物生物量碳含量及小麦地下生物量均呈显著线性相关;土壤水分对土壤CO2排放的影响居于次要地位。

英文摘要：

A field experiment was conducted in Amorpha fruticosa-wheat intercropping system to understand the effect of different hedge pruning management practices（e.g.,prunings were removed from plots（AR）,incorporated into soil（AI） and applied as mulch（AC）） on soil CO2 emission during the growth of winter wheat in 2008-2009.The results showed that soil CO2 fluxes revealed distinct seasonal dynamics for all treatments,with the highest values being observed during the heading stage of crop growth,while the lowest fluxes were observed during the overwintering stage.Soil CO2 fluxes were significantly affected by different hedge pruning managements.Compared to monoculture wheat,the soil CO2 fluxes of removal of pruning decreased by 9.07%,on contrast,incorporation of pruning and surface-applied pruning increased by 35.70% and 8.42%,respectively.The results indicated that soil CO2 fluxes had significant positive correlation with soil temperature,soil microbial biomass carbon at 0-5cm depth and wheat root biomass,but no significant correlation with soil moisture.