内蒙古锡林河流域羊草草原植物生长旺季呼吸的影响因素分析和区分(英文)

编号 zgly0001585424

文献类型 期刊论文

文献题名 内蒙古锡林河流域羊草草原植物生长旺季呼吸的影响因素分析和区分(英文)

作者 耿元波  罗光强 

作者单位 InstituteofGeographicSciencesandNaturalResourcesResearch  CAS  GraduateUniversityofChineseAcademyofSciences 

母体文献 Journal of Geographical Sciences 

年卷期 2011年01期

年份 2011 

分类号 S812 

关键词 Leymuschinensissteppe  ecosystemrespiration  soilrespiration  microbialrespiration  temperature  moisture 

文摘内容 Based on the static opaque chamber method,the respiration rates of soil microbial respiration,soil respiration,and ecosystem respiration were measured through continuous in-situ experiments during rapid growth season in semiarid Leymus chinensis steppe in the Xilin River Basin of Inner Mongolia,China. Soil temperature and moisture were the main factor affecting respiration rates. Soil temperature can explain most CO2 efflux variations (R2=0.376-0.655) excluding data of low soil water conditions. Soil moisture can also effectively explain most of the variations of soil and ecosystem respiration (R2=0.314-0.583),but it can not explain much of the variation of microbial respiration (R2=0.063). Low soil water content (≤5%) inhibited CO2 efflux though the soil temperature was high. Rewetting the soil after a long drought resulted in substantial increases in CO2 flux at high temperature. Bi-variable models based on soil temperature at 5 cm depth and soil moisture at 0-10 cm depth can explain about 70% of the variations of CO2 effluxes. The contribution of soil respiration to ecosystem respiration averaged 59.4%,ranging from 47.3% to 72.4%; the contribution of root respiration to soil respiration averaged 20.5%,ranging from 11.7% to 51.7%. The contribution of soil to ecosystem respiration was a little overestimated and root to soil respiration little underestimated because of the increased soil water content that occurred as a result of plant removal.