Diameter frequency distribution for 0-5mm roots in six mid-subtropical forests subject to different regeneration approaches Optimum utilization of soil resource and sustainable agricultural development--A case study from Nanping City of Fujian Province The soil resources evaluation methods and the definition of the evaluation factors weight SEASONAL DYNAMICS OF FINE ROOT BIOMASS, ROOT LENGTH DENSITY, SPECIFIC ROOT LENGTH AND SOIL RESOURCE AVAILABILITY IN A LARIX GMELINI PLANTATION Response of plant diversity and productivity to soil resources changing under grazing disturbance on an alpine meadow A research review on "fertile islands"of soils under shrub canopy in arid and semi-arid regions Effects of soil resource availabilities on vertical distribution and dynamics of fine roots in a Caragana korshinskii plantation