As a key afforestation tree species in the northern region,Pinus sylvestris var.mongolica matures earlier than in its provenance after being introduced to Zhanggutai,and its nutrient input mainly relies on litter.To elucidate the mechanism of litter yield variation in mature P.sylvestris var.mongolica plantations and provide a scientific basis for forest land regeneration,the annual total litter,monthly dynamics of litter components in the P.sylvestris var.mongolica forestland in Zhanggutai Town,Zhangwu County,Liaoning Province and the influencing factors were analyzed.The results showed that after entering the mature period,the monthly dynamics of total litter amount in the P.sylvestris plantation exhibited a bimodal pattern.In May,the litter volume of each component was relatively balanced,while in October,the majority of the total litter consisted of needles,accounting for 90.86％.Needles were the predominant component of litter of P.sylvestris var.mongolica plantation,comprising over half of the total litter at different forest densities and growth stages.The differences in stand growth stage and stand density did not have a significant impact on the total litter amount and the amount of each litter component(P＞0.05),but exhibited an increasing trend with increasing stand growth stage and stand density.Additionally,wind speed emerged as a key factor affecting branch litter amount,while monthly average temperature was identified as a key factor influencing the total litter amount.Precipitation had a relatively minor impact on the litter amount of each component.Under the condition of 625 N·hm-2,environmental factors were better able to meet the growth requirements of P.sylvestris var.mongolica plantations during the mature period.
mature Pinus sylvestris forestlitter yieldlitter compositionimpact of climate factorsstand density
NETL
NSTL
维普
万方数据
