Litter's reserve and water-holding capacity for major secondary forest communities in Changbai Mountains.

The litter's reserve and water-holding capacity were investigated by the methods of field survey and litter soaking experiments for major secondary forest communities in Bajiazi Forestry Bureau of Yanji,Jilin Province.The results showed that the litter reserve of all communities ranged form 4.67 t·hm-2 to 5.13 t·hm-2,with a rank of deciduous broad-leaved forest Asian white birch forest Korean pine broad-leaved forest mixed forest.The reserves of the undecomposed litter were more than that of the semi-decomposed litter,and occupied about 60% of the total.The water absorption strength varied significantly among different litter types,the fastest was the semi-decomposed litter,followed by broad-leaved litter,needle-branches litter,and grass litter,while that of the broad-branches litter,miscellany litter,needle-leaves were relatively slow.The maximal water-holding rate and the maximal water-holding capacity were significant different among different litter types,and the maximal water-holding rate followed the order of miscellany grass coniferous needles broad-leaves semi-decomposition coniferous branches broad-branches,and the maximal water-holding capacity followed the order of semi-decomposition broad-leaved broad-branches coniferous needles coniferous branches miscellany grass.The maximal water-holding rate of all communities ranged from 291.53% to 364.56%,and water-holding rate followed the order of Asian white birch forest deciduous broad-leaved forest mixed forest Korean pine broad-leaved forest.The maximal water-holding capacity of all communities ranged from 13.64 t·hm-2 to 18.00 t·hm-2,and with the same order for water holding rate.The litter soaking experiments showed that the water-holding rate and water-holding capacity increased with the soaking time,following a logarithmic curve(W=alnt+b),and fitting results were very significantly.