Water productivity changes and deep soil desiccation effects of different planting density black locust(Robinia pseudoacia)forestlands were simulated with WinEPIC model during 1957-2001 at Changwu on semi-humid areas and Yanan on semi-arid areas of the loess plateau.The simulated results showed that:(1)simulated annual biomass amounts increased rapidly in early growth stage,and then declined obviously with fluctuation when reached its maximum on high planting density(6000 plants/hm2),high medium planting de...
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