作　　者： ; ; ; ; ; ;

机构地区： 中国科学院华南植物研究所

出　　处： 《生态学报》 2003年第8期1673-1678,共6页

摘　　要： 土壤呼吸是土壤微生物活性和土壤肥力一个重要指标 ,是土壤碳流通的一个主要过程 ,也是陆地生态系统碳循环的一个关键部分 ,对研究全球变化非常重要。国内土壤呼吸的研究主要集中在北京山地温带林区、尖峰岭热带森林及东北羊草草原和中亚热带等地 ,南亚热带地区森林土壤呼吸尚无报道。选取南亚热带鼎湖山自然保护区森林演替系列中的 3种主要植被类型 (季风常绿阔叶林 ,针阔叶混交林和马尾松林 )为研究对象 ,研究了土壤呼吸和与之相关的土壤微生物生物量、土壤温度和土壤含水量以及他们之间的关系。结果表明 ,季风常绿阔叶林、针阔叶混交林和马尾松林年均土壤呼吸速率依次是 477.9,435 .4,42 9.5 mg CO2 · m- 2 ·h- 1,土壤呼吸速率与土壤温度的季节变化规律接近 ;3种植被类型土壤微生物生物量变化规律与土壤呼吸变化规律一致 ,季风常绿阔叶林最高 ,马尾松林最低 ,土壤微生物量高的土壤中碳周转量较大 ,碳素周转还带动了其他营养元素周转 ,有利于生态系统生存和持续发展 ;季风常绿阔叶林、针阔叶混交林和针叶林代谢熵依次是 0 .5 8～ 0 .60 ,0 .92～ 1 .0 0 ,1 .30～ 1 .35 ,表明 3种植被类型土壤中土壤微生物对土壤碳的利用效率依次降低。 Soil respiration is traditionally considered to be important because it is an index of soil microbial activity and soil fertility. Recent years, tremendous worldwide attention has also been paid on soil respiration because it is recognized as the major soil carbon efflux and one of the key components of carbon cycle in terrestrial ecosystems. In order to illustrate the patterns and impacts of global change, it is essential to measure the soil respiration. In China, studies on soil respiration and forest carbon budget has been carried out only under some vegetation types such as temperate forests in Beijing, tropical forests of Jianfengling in Hainan, Leymus chinesis grassland in northeastern China and east mid-subtropical in China. However, soil respiration under low subtropical forests of China has not been well documented so that it has prevented us from understanding the contribution of soil respiration of this region to global carbon budget. In the present study, three major forests of Dinghushan Biosphere Reserve which located at the low subtropics of China were selected to measure the soil respiration and to correlate it to soil microbial biomass, soil temperature and moisture. Three major forests selected were monsoon evergreen broadleaf forest, Pine and broad-leaf mixed forest and pine forest which represented a succession series in Dinghushan Biosphere Reserve. Annual mean soil respiration rate of monsoon evergreen broadleaf forest, Pine and broad-leaf mixed forest and pine forest were 477.9, 435.4 and 429.6 mgCO 2·m -2·h -1, respectively. Soil respiration showed a similar pattern to soil temperature. Soil microbial biomass showed the same trend as soil respiration, which was the highest for monsoon evergreen broadleaf forest and lowest for pine forest. Faster turnover rates of soil carbon and other elements with high soil microbial biomass might be essential for sustaining the health of an ecosystem. The metabolic quotient (mg CO 2-C·g -1Cmic·h -1) from low to high was: monsoon evergreen br

关 键 词： 鼎湖山 主要植被 土壤碳释放 土壤呼吸 土壤碳流通

领　　域： [农业科学] [农业科学]