摘要
采用静态气室法测定了长春市人民大街行道树与对照林地不同深度的土壤中CO2含量.研究发现林地土壤呼吸作用可以用土壤中CO2含量大小及其变化规律反映出来,而街路行道树土壤中的CO2含量不能直接反映土壤呼吸速率大小.硬覆盖直接导致街路土壤通气性变差,形成气体交换屏障,阻碍土壤中CO2的释放,造成土壤中CO2的高浓度积累.结果是抑制了树木根系和土壤微生物呼吸,是树木根系生长缓慢,树木生长弱势和易于患病虫害的重要原因.
The concentrations of CO2 at different depths of soil were measured using captive test for the street-trees in the people's avenue in Chuangchun City and for a forest used as control. It was found that the intensity of respiration in forest soil could be reflected by CO2 concentration and the pattern of its changes in the soil, but could not by the CO2 concentration in the soil under the street trees. The crust cover of the soils directly leads to bad soil aeration, forming a barrier for air exchanges, blocking the release of CO2 from soils and accumulating high concentration of CO2 in the soils. The consequence of this would restrain therespiration of the roots and the edaphons, slowing down the growth of the roots of trees, which is the key reason for poor vigor and easy infection of plant diseases and pests.
出处
《中国城市林业》
2004年第1期34-37,共4页
Journal of Chinese Urban Forestry
关键词
硬覆盖
城市街路
行道树
土壤呼吸
Street trees
Crust covered soil
Soil respiration
