【作者】 杨红露； 孙辉； 张宁； 姜发艳；

【Author】 YANG Honglu,SUN Hui,ZHANG Ning,JIANG Fayan (Department of Environmental Science and Engineering,Sichuan University,Chengdu,610065)

【机构】 四川大学环境科学与工程系；

【摘要】 在冬春交替时期高纬度地区和高海拔生态系统的土壤常有冻融循环现象。冻融循环会对土壤团聚体结构、含水量、土壤温度等产生影响,使得土壤中微生物的活性及结构组成发生改变,进而影响土壤中微生物参与的碳氮元素的生物地化循环。目前对冻融循环的研究主要是针对北方高纬度地区,如苔原、泰加林等北极和亚北极生态系统,高纬度草地、有机农田等,表明冻融循环对温室气体的排放有显著的影响。但是对冻融交替影响土壤温室气体排放的机理研究不足,而冻融交替对土壤温室气体,特别是CO₂和N₂O,排放的影响机理,以及冻融格局的改变对排放通量的影响等方面,也越来越受到重视,这将有助于研究全球气候变化与土壤冻融循环之间的关系。因此,加强季节性冻融低温生态系统（尤其是高海拔低温生态系统）效应机理的研究,对揭示全球气候变化的区域效应具有重要意义。更多还原

【Abstract】 In high latitude and altitude ecosystems,soil is subjected to experience freeze-thaw cycles during winter and spring period.Freeze-thaw cycles patterns changes have an impact on soil aggregate structure,moisture content,soil temperature,activities and components of soil microbial and enzymes,biogeochemical cycles of carbon and nitrogen in these low-temperature ecosystems. Almost all of studies on freeze-thaw cycles mainly are focused on soils in northern ecosystems in high latitudes,such as tundra,taiga,grassland,and farmland in arctic and subartic ecosystems. Many studies concluded that the freeze-thaw cycles impact emissions of greenhouse gases, especially CO₂ and N₂O,significantly;however,few studies have examined processes and mechanisms of responses of soil greenhouse gas emission to pattern changes of freezing and thawing.Has also attracted more and more attentions will be required to processes research on those low-temperature ecosystems in the high latitude and altitude ecosystems for global change study in the future.更多还原