山西太行山油松不同比例林分枯落物水文特征OA

Taking typical Pinus tabuliformis forests in the Taihang Mountains of Shanxi Province as the research object,we in-vestigated the litter characteristics under stands with four proportions of P.tabuliformis(80%-100%,60%-80%,40%-60%,and 20%-40%).Through litter soaking experiments,we statistically analyzed the litter storage,water-holding indi-ces,and interception indices in the sample plots,aiming to explore the hydrological characteristics of P.tabuliformis stands in Shanxi Province.The results showed that the total litter storage ranged from 19.40 to 21.94 t·hm-2,with no significant differences among the four P.tabuliformis proportional stands.Litter was dominated by the semi-decomposed layer,accounting for 62.12%-72.82%.Litter storage increased with increasing total thickness,which ranged from 2.60 to 3.69 cm.The dynamic curve of water-holding capacity of litter in stands with different P.tabuliformis proportions exhib-ited an inverted J-shape,fitting the logarithmic function model y=klnt+b.The maximum water-holding capacity of the un-decomposed layer was12.48-19.97t·hm-2,which was significantly the highest at the40%-60%proportion.The maxi-mum water-holding capacity of the semi-decomposed layer was 41.74-59.96 t·hm-2,which was significantly the highest at 20%-40%,followed by 40%-60%.The maximum water-holding rate at 40%-60%was significantly the highest,ca-pable of absorbing 2.3-3.0 times its own mass in water.The maximum interception storage of the undecomposed layer at 40%-60%was about 37%higher than that at 80%-100%and about 166%higher than that at 20%-40%.The maximum interception storage of the semi-decomposed layer was the highest at 60%-80%(25.66t·hm-2)and the lowest at 20%-40%(14.70 t·hm-2).The maximum interception rate at 40%-60%was significantly the highest.Both the effective in-terception rate and effective interception storage were significantly the highest at 40%-60%,followed by 60%-80%.All hydrological indices were higher in the semi-decomposed layer than in the undecomposed layer.The results indicate that the conifer-broadleaf mixed stand with a P.tabuliformis proportion of 40%-60%has better litter water-holding and inter-ception capacities.