典型草原恢复与退化群落土壤呼吸的特征研究  

Characteristics of Soil Respiration in Recovered and Degraded Communities in Typical Steppe

作　　者：王慧清[1,2] 王常顺[2,3] 梁存柱[2] 王炜[2] 王立新[2] 

机构地区：[1]呼伦贝尔市气象局,内蒙古呼伦贝尔021000 [2]内蒙古大学生命科学学院中美生态能源及可持续性科学内蒙古研究中心,呼和浩特010021 [3]呼伦贝尔学院科研处,内蒙古呼伦贝尔021008

出　　处：《内蒙古大学学报（自然科学版）》2015年第6期600-608,共9页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金项目(31160476;41261009);国家科技支撑计划项目(2011BAC02B03);科技部科技示范项目(2008BAD95B03)

摘　　要：土壤呼吸是生态系统碳循环的重要组成部分,本研究针对内蒙古典型草原退化与恢复群落,测定了其在生长季和非生长季的土壤呼吸日动态变化.研究表明:退化群落平均土壤呼吸约是恢复群落的50%;非生长季CO2的排放速率最高约为生长季的10%.恢复群落土壤呼吸速率与温度呈显著正相关,与土表温度的相关性最高;退化群落的相似特征仅在非生长季出现.过度放牧导致的植被退化是土壤呼吸速率降低的原因.植被退化改变了群落土壤呼吸对环境变化的响应模式,影响非生长季土壤呼吸的因素及其权重与生长季相比发生明显变化.本研究对于了解土地利用变化对于碳释放的影响具有一定的科学意义,对天然草地可持续管理也有积极的意义.Soil respiration is an important part of the ecosystem carbon cycle. In current study, the daily dynamics of soil respiration during the growing season and non-growing season in the de- graded and recovered grassland communities in Inner Mongolia were measured. The results showed that： （1） the average soil respiration of degraded community was equal to 50% of the recovery com- munity; （2） the COz emission rate in non-growing season was up to about 10% of the growing sea- son; （3） in the growing season, a significant positive correlation between soil respiration and soil temperature exist in the recovered community,while no significant relationship was founded in de- graded community; （4） vegetation degradation caused by overgrazing decreased the soil respiration rate and changed the response of soil respiration to environmental change; （5） the factors and their weights affecting soil respiration in non-growing season differed from the factors in growing season. This study highlights the important impact of land use mode on carbon emissions.

关 键 词：生长季 非生长季 过渡放牧 温度相关性 

分 类 号：Q149[生物学—生态学]