Effects of litter decomposition on soil nutrients in three broad-leaved forests
Nutrients in soils of Quercus variabilis forest,Juglans mandshurica forest and Q.aliena forest in Baxian Mountain National Nature Reserve in Tianjin were measured as affected by different litter layers:fresh litter,half-decomposed litter and soils.The results showed that in the fresh litter,C content was highest in the Q.aliena forest (486.1 g · kg-1) and lowest in the Q.variabilis forest (447.5 g · kg-1),and N and P contents were highest in the J.mandshurica forest (17.9 and 1.2 g · kg-1) and lowest in the Q.aliena forest (13.2 and 0.8 g · kg-1).In the half-decomposed litter,C and P contents were not significantly different among the three forests;N content was highest in the Q.aliena forest (17.1 g · kg-1) and lowest in the Q.variabilis forest (10.5 g · kg-1).The contents of C,N and P varied in the soils of the different forests:Q.aliena forest ＞ J.mandshurica forest ＞ Q.variabilis forest.In the fresh litter,C/N and C/P were significantly lower in J.mandshurica forest than in Q.aliena forest and Q.variabilis forest;in the half-decomposed layer,C/N and C/P were not significantly different among the three forests.From the fresh layer to the half-decomposed layer of litter,C/N and C/P were decreased by 17％ and 11％ in Q.variabilis forest,by 19％ and 35％ in Quercus aliena forest,but not significantly different in J.mandshurica forest.The mineral element content in the fresh litter tended to decrease from J.mandshurica forest,to Q.variabilis forest,and Q.aliena forest; pH increased with increasing the mineral element content.The order of total content of mineral element in the litter was Q.variabilis forest ＞ Q.aliena forest ＞ J.mandshurica forest.
国家科技期刊平台
NSTL
万方数据
维普
