内蒙古典型草原主要植物群落土壤呼吸的初步研究

从野外选取有代表性的羊草，羊草－冷蒿，大针茅，克氏针茅和沙蒿群落，原状移栽到试验场，采用动脉气室／ＩＲＧＡ法在植物主要生长期，连续测定各群落的土壤呼吸，结果表明，土壤呼吸速率具有明显的昼夜变化和动态。沙蒿群落土壤呼吸张土壤ＣＯ２排放总量低于其它群落，羊草群落ＣＯ２日排放量和ＣＯ２总排放量较高。

Primary Study on Soil Respiration of Main Plant Communities in Typical Grasslands in Inner Mongolia

Plant communities of Leymus chinensis, L. chinensis- Artimisia frigida, Stipa grandis, S.krylovii,and A. intramongolica were transported into experimental station from the field keeping their previous states. The soils were carefully moved with aboveground plants with a depth of 30cm. Soil respiration rate were measured by dynamic chamber/IRGA methods during the main growth period of communities (from later May to later August). The results showed that the soil respiration were significant difference with diurnal and seasonal dynamics. The aboveground biomass and soil respiration were closely correlated of Artimisia community. The rate of soil CO2 release from A. intramongolica community was consistently lower than other communities,and L. chinensis was higher. only for A. intramongoica was aboveground biomass highly positively correlated with seasonal soil respiration. Temperatures of air and soil had effects on diurnal and seasonal CO_2 release rate. Temperature of 5~20cm soil layers explained most of the variance of soil respiration. Soil water content had little influence on soil respiration of A. intramongolica communities while it controlled the soil bioactivities of other communities.