| The underground part of the ecosystem is still poorly understood, even though Ecology of the half underground.And this part is related with soil respiration and its process. The determination of soil respiration rate and its temporal fluctuation and the factors of soil respiration process are the Base data of accurate estimation of the carbon balance in terrestrial ecosystems and global change potential effect.And also are the basis to formulate a response to the global change strategy. Studying on the the law and mechanism of city greenbelt soil carbon emissions is important to ecological land use planning,layout, construction and management in carbon city.In this study, the research object are temporal and spatial characteristics of city greenbelt soil respiration and its controlling factors.We mainly research contents as following:(1) the distribution of individual tree scale soil respiration in space;(2) The soil respiration on different community,different types, and different coverage.;(3) Soil respiration on community scale of the spatial distribution pattern and seasonal dynamics.The results show that:(1) The soil respiration rate in the tree base reaches the maximum value in individual tree scale,and decreasing with distance from the tree base increasing. Near the plants, the root biomass is the main influence factor to soil respiration;(2)The soil respieations have obvious differences in different communities. Structure of canopy have a certain influence on the soil respiration rate.The diurnal dynamics of soil respiration in all community structure will increase with the increasing of temperature. The change of diurnal dynamics in soil respiration is very slowly.(3) During the study period,monthly changes of soil respiration will change along with the change of the temperature. soil respiration rate reached the highest in summer an reached the lowest in winter.(4) The soil respiration was significantly related to soil temperature, soil water content, and leaf area index. |
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