To explore the water conservation capacity of vegetation in the forest park and provide a reference for vegetation configuration and management

six typical stands in Tianlong Mountain Forest Park were selected to investigate and analyze the litter thickness

accumulation

water holding and other indicators inside the forest. Soaking methods were used to measure the hydrological effect of litter.(1) The interference and thickness of litter ranged from none to moderate and from 0.57 to 2.63 cm

respectively

among which

Populus davidiana gave the largest

and the mixed forest of Platycladus orientalis-Pinus tabuliformis-Armeniaca sibirica gave the smallest. The accumulation range was 7.20~16.30 t/hm2

among which

Pinus tabuliformis-Platycladus orientalis mixed forest was the largest

and Platycladus orientalis-Pinus tabuliformis-Armeniaca sibirica mixed forest was the smallest. (2) Except for Populus davidiana

the maximum water holding capacity of the semi-decomposed layer was greater than that of the undecomposed layer

among which

Pinus tabulaeformis-Platycladus orientalis was the largest and Platycladus orientaliswas the smallest. The maximum water holding rate of undecomposed layer was larger than that of semi-decomposed layer

the largest was found under Robinia pseudoacacia and the smallest under shrub. The range of maximum water holding capacity was 20.02~27.90 t/hm2

and the range of maximum water holding rate was 187.40%~277.89%. The water holding rates of coniferous and broad-leaved mixed forest were comparatively higher. (3) The maximum effective storage capacity of tree species was found in Populus davidiana with its value of 15.05 t/hm2; the minimum was Pinus tabuliformis of 12.33 t/hm2. Platycladus orientalis-Pinus tabuliformis-Armeniaca sibirica mixed forest had the maximum storage rate. (4) The relationships of litter water holding capacity and water holding rate with time could be fitted by logarithmic and power functions

respectively. Both of them reached the peak values within two hours of soaking in water. Based on the comprehensive comparison of six forests

light disturbed Populus davidiana had the best hydrological benefits; oppositely

moderate disturbed Pinus tabuliformis-Platycladus orientalis mixed forests had the worst. The broad-leaved species had better hydrological effects than coniferous species

and the mixed coniferous and broad-leaved species were better than a single species. These consequences can provide references for the vegetation configuration and hydrological benefit evaluation of forest parks.