Nutrient return of litterfall in a Populus tremuloides plantation
DONG Bin1, CAO Yong-fu2, WEI Hai-dong3
1. School of Chinese Language and Literat, Linyi Normal University, Linyi Shandong 276005, China; 2. Linyi Forestry Bureau of Shandong 276000, China; 3. School of Environment and Tourism, Linyi Normal University, Linyi Shandong 276005, China
Litterfall plays an important role in nutrient cycling and energy flow of forest ecosystems.Litterfall production,composition,seasonal dynamics,and the quantity of nutrient elements(N,P,K,Fe,Ca,Mg) of Populus tremuloides were studied in this paper.The results showed that the annual litterfall production of mature poplar(MP) was 4.45 t·hm-2·a-1,1.42 times of that for middle-age poplar (MAP).Fallen leaves dominate litterfall composition,accounting for 70.1% and 81.5% for MP and MAP,respectively.The dynamics of litterfall showed a significant seasonal variation,with the first peak occurring between February and March and the second in October or November.Annual fluxes of the 6 nutrient elements in MP was 68.4 Kg·hm-2a-1,which was as 1.4 times of that in MAP,and nutrient elements return decrease in the order of N>Ca>K>Mg>Fe>P.The utilization efficiency of N,P,Fe,and Mg in MP was higher than that in MAP,but lower in MP than in MAP for K and Ca,which could be attributed to the difference in growth mechanism.
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