库布齐沙地土壤呼吸及其影响因素分析

Analysis on soil respiration and its effect factors in the Hobq Sand Dune

土壤呼吸是陆地生态系统物质循环和能量流动的一个最主要环节,也是评价大气中CO2浓度增减和土壤生物活性的重要指标,对半干旱区自然状况下的库布齐沙地土壤呼吸进行测定与分析,结果表明:1)半干旱地区沙地的土壤呼吸速率值与土壤含水量具有相关性,但在小时间尺度上与土壤温度没有相关性;2)半干旱地区沙地的土壤呼吸速率值与土壤细菌数量、土壤固氮菌数量具有相关性,但与土壤真菌数量、土壤放线菌数量没有相关性;3)干旱地区沙地的土壤呼吸速率值与植被地上、地下生物量具有相关性。这些结论将增进人们对半干旱区沙地土壤呼吸及其影响因素的了解,最终更准确地认识陆地生态系统的物质循环和能量流动。

Soil respiration is a very important aspect in mass circulation and energy flow through ecosystems; it is the main index of evaluating carbon dioxide change in atmospheres and soil biological activity. This paper determined and analyzed the soil respiration of Hobq sand dune in natural conditions of semi-arid region, the results indicated that 1） the soil respiration rate was related to soil moisture, but it was unrelated to the soil temperature at small time scales in sand dune of semi-arid region. 2） The soil respiration rate was related to bacterial population and azotobaeter population, but it was unrelated to the epiphyte population and actinomyces population. 3） The soil respiration rate was related to vegetation biomass, including aboveground and underground biomass. This conclusion could help to realize the soil respiration and its effect factors in sand dune of semi-arid region, and understand the material cycle and energy flow in terrestrial ecosystem.