浙江天童森林退化和受损对土壤呼吸的影响

以常绿阔叶林顶级群落为参照,选择了常绿阔叶林亚顶极群落、针叶林、灌丛和灌草丛代表不同退化类型;同时,以4种人工采伐处理代表常绿阔叶林不同受损程度,分别研究了不同退化和受损程度影响下,土壤的呼吸速率及影响因素.结果表明:(1)土壤呼吸速率具有明显的季节动态;(2)土壤呼吸速率分别在常绿阔叶林顶极群落与灌草丛最高,其次分别...

Impacts of forest degradation and damage on soil respiration in the Tiantong region, Zhejiang Province

This paper chose climax evergreen broadleaf forests (EBLF) as a reference, then selected sub-climax forests, secondary coniferous forests, shrubs and grassland to represent different stages of forest degradation, and 4 logging stands to denote forests damage intensity, in the Tiantong region, Zhejiang province. To understand the impacts of EBLF degradation and damage on soil respiration, soil respiration rate and associated influencing factors were measured among above forests. The results showed that: (1) there was a pronounced seasonal pattern of soil respiration among forests; (2) soil respiration rate was the highest in climax EBLF and the grassland, intermediate in coniferous forests and shrub lands, and the lowest in sub-climax EBLF; (3) the logging did not affect soil respiration rate along the forest damage intensity; and (4) soil respiration was determined by soil C/N ratio and soil pH through forest degradation series; specifically, the main factor in the early stage was soil C/N ratio, and in the later stage of degradation was soil temperature. It was concluded that the controlling factor of soil respiration was shifted from biological-based to abiotic-based orientations, through forest degradation.