福州市片林和草坪细根生长与死亡的季节动态

细根的净生长与周转在城市绿地地下碳过程中具有至关重要的影响。本研究采用微根管法与土钻法相结合,对福建省福州市市区内城市绿地细根生长死亡及其净生产量的季节动态进行研究。结果表明:1)城市片林与城市草坪的细根生长死亡的季节动态明显,且季节动态模式相似。2)气温和降水因子对于城市片林和草坪的细根生长量及死亡量的影响不同。细根的死亡除了与气温、降水等因子有关之外,还与其他因子密切联系。3)城市片林与城市草坪的细根净生产量的季节动态有所不同,且片林的细根年净生产量大于草坪。4)城市片林和草坪的细根年净生产量小于天然森林和天然草原,这可能与人为管理措施的影响以及不同研究方法的偏差有关。

Seasonal Dynamics of Fine Root Growth and Death in Urban Forests and Lawns of Fuzhou

The net growth and turnover of fine roots have crucial impacts on underground carbon process in urban green space. This study used soil core method and minirhizotron technique to investigate seasonal dynamic of fine root growth, fine root death as well as the net production of urban green space in Fuzhou. The results indicates： 1 ） There were obviously and similar seasonal dynamics infine root growth and death in urban forests and lawns. 2） Climatic factors （ air temperature and precipitation） had different effect on the changes of growth and death of fine root in urban green space, besides, there were other factors related to death of fine root. 3） Seasonal dynamics of the fine root net production in urban forests and urban lawn were different. The fine root net production in the urbanforests was higher than that of urban lawns. 4） The net productions of foot root in urban green space were lower than that in natural forests and grasslands, which may be due to the influences of humanmanagement and the deviation of different methods.