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Nutrient Elements Biological Cycle of Undergrowth under Different Rotations of Continuously Planting Chinese Fir

Yang Yusheng;Qiu Renhui;Yu Xintuo;Chen Guangshui(Fujian Forestry College,Nanping 353001, P. R. China)  
Through studies on biomass,nutrient elements and nutrient cycle of undergrowth of 29-year-old Chinese fir plantations under different rotations of continuously planting in Xihou of Nanping city, the result indicated that the total undergrowth biomass,gerb layer biomass,shrub layer biomass under the third planting were all higher than that under the second and first. The contents of nutrient elements such as N,P2O5, K2O, Fe, Mn, Cu, Zn decreased along with the increasing of continuously planting and the contents of nutrient elements of gerb layer were higher than that of shrub layer under the same stand;the accumulations of nutrient elements of undergrowth were all in the sequence of NK2OCaO,MgOP2O5,MnFeZnCu under different rotations of planting; the annual uptake and return increased along with the increasing of continuously planting,and the recycling rate of individual nutrient element followed the order of the second plantingthe third plantingthe first planting.
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