Leaf N, P and K resorption of major tree species in a montane region of eastern Liaoning Province, China
Nutrient resorption,one of the important mechanisms for nutrient conservation in plant species,plays an important role in litter decomposition and nutrient cycling.To clarify the nutrient resorption between Larix spp.in the plantation forest and four native broadleaved tree species (i.e.,Quercus mongolica,Acer mono,Juglans mandshurica and Fraxinus rhynchophulla) in the secondary forests,we measured N,P and K concentrations in mature and senescent leaves of these five tree species in a montane region of eastern Liaoning Province,China.The results showed that the N,P and K concentrations of senescent leaves were significantly lower than those of mature leaves,except for the K concentration of Larix spp.(P＜0.05).The N resorption efficiency of J.mandshurica was significantly different from that of the other three broadleaved tree species (P＜0.05).The P resorption efficiency of F.rhynchophulla was significantly different from that of Q.mongolica and A.mono (P＜0.05).Furthermore,the K resorption efficiency of A.mono was significantly different from that of the other three broadleaved tree species (P ＜0.05).N,P and K resorption efficiencies of Larix spp.were generally lower than those of the broadleaved tree species,especially its P resorption eff~ciency was significantly lower than that of F.rhynchophulla (P＜0.05) and its K resorption efficiency was significantly lower than that of J.mandshurica and F.rhynchophulla (P＜0.05).All of these indicated that the larch made a positive feedback on soil nutrient availability via reducing the nutrient resorption efficiency and improving the litter nutrient input.
nutrientdeciduous tree specieslarch plantationnutrient resorptionsecondary forest
国家科技期刊平台
NSTL
万方数据
维普
