Fine root plays an important role in belowground carbon cycling of urban green space. In this study, existing fine roots biomass was measured in urban green space in Fuzhou by using soil core method and WinRHIZO root analysis software. The results indicated ： 1 ） the fine root biomass of urban woodlots was between 1.15 - 2. 60 t/hm2 lower than that of urban lawn （ 1.34 - 4. 45 t/hm2 ） and most of sub-tropical natural forests. 2 ） the vertical distribution of fine root is that it decreases with soil depth, while the difference of fine root biomass between up-soil and deep-soil in urban lawn is more obvious than that of urban woodlot. 79% of fine root in urban lawn is distributed in the surface of soil （0 - 10 cm） , only 20% of fine root is accounted for in the depth of 10 -40 cm. However, there is only about 50% of fine root in the surface （0 - 10 cm） of soil in the urban woodlot, 30% of that is in the depth of 10 - 30 cm and 20% of that still exist in the depth of 〉 40 cm. 3 ） The doublefactor regression （length and diameter） could estimate fine root biomass well in all urban green spaces. In addition, the fitting results in urban woodlot models （R2 〉 0. 85 ） were better than the urban lawn models （ R2 between 0. 59- 0. 79）. For the un-negligible effect of fine root biomass of lawn in the process of urban belowground carbon cycling, the other variables should be introduced into the model to optimize the fitting result in the future.
urban lawnsurban woodlotsfine root biomassdiameter of fine rootslength offine roots
NETL
NSTL
维普
万方数据
