Abstract
In an artificial Salix gordejevii Chang et Skv. plantation of the Horqin sandy land, we investigated vertical distribution (in 0-100 cm depth), biomass (FRD), fine root production (FRP), fine root length density (FRLD) and turnover of fine roots ( midslope > bottom of dune. Ingrowth cores were harvested after 2, 3, 4, 5, 6 and 8 months of installation. At the first five sampling times, FRP and FRLD (0-40 cm) follows the same order with FRD along the topographical gradient, while FRP harvested after 8 months does not follow the same tendency, they are 348, 402 and 356 g·cm �2 in dune top, midslope and bottom of dune, respectively. Fine root turnover ranges from 1.04-1.92 year �1 , and fine root turnover (20-40 cm) increases from dune top to bottom of dune along the topographical gradient. Correlation analysis between FRP and soil available resources indicates that only mean soil volumetric water content significantly correlates with annual FRP, which suggests that soil water content might be more crucial for shrub growth than fertility along the topographical gradient.
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