Dynamics and decomposition characteristics of litter of two typical forest species
Forest litter is an important source of forest carbon pools and soil nutrients,as well as the most dangerous ig-nition material for forest fires.It is of great significance for maintaining the stability of forest ecosystem functions.This study analyzed the current stock,input,and decomposition dynamics of litter in the secondary forest of Quercus mon-golica and Larch plantations.The results showed that the current stock of litter on the ground surface of the Q.mongoli-ca forest(7.73 t·hm-2)was less than that of the Larch forest(25.82 t·hm-2).The annual litter input of the Q.mongolica forest(3.59 t·hm-2)was greater than that of the Larch forest(3.22 t·hm-2).The monthly input of litter in different age groups of the two forest types showed a unimodal dynamic pattern,with the highest input in October,and the main source was fallen leaves.The decomposition process of fallen leaves in the two forest types conformed to the Olson ex-ponential decay model,with the expressions beingymeng=0.98704e-0214x andyluo=1.02.61e 0213x,respectively.It was esti-mated that it would take 3.18 years and 3.38 years for the decomposition of fallen leaves in the Q.mongolica forest and larch forest to reach 50％,respectively;and 13.94 years and 14.19 years for the decomposition to reach 95％,respec-tively.The results of this study will provide a reference for revealing the carbon and nutrient cycles of forest ecosys-tems in this region.
万方数据
维普
