A Comparative Study On The Hydrological Characteristic Of Understorey Vegetation And Soil

As a important component of water conservation forest ecosystem, understorey vegetation system plays a principal part of forest hydrological benefits. Based on located research methold, compared with wild meadow, studies on the hydrological benefits of broad leaved forest, pinus massoniane, cunning hamia lanceloate Hook ecosystem, moso bamboo forest in the fixed standard area in Qujiang County, Guangdon Province were carried by studying on hydrological characteristic of different layers of understorey vegetation system.The water holding capacities of understorey vegetation systems were: wild meadow>pinus massoniane) broad leaved forest> moso bamboo forest >cunning hamia lanceloate Hook ecosystem. Difference of water holding capacity between pinus massoniane and broad leaved forest was not significant, both of them were higher than that of cunning hamia lanceloate Hook ecosystem and moso bamboo forest.The sequences of maximum water holding capacity of litter layer were: pinus massoniane) broad leaved forest>moso bamboo forest >cunning hamia lanceloate Hook ecosystem.The sequences of maximum soil water content in the layer of 0-80 centimeter were: broad leaved forest) pinus massoniane) moso bamboo forest) wild meadow) cunning hamia lanceloate Hook ecosystem.The sequences of total amount of water holding content from the layer of understorey vegetation to 80 centimeter deep soil of different forest type were: broad leaved forest) pinus massoniane) wild meadow) cunning hamia lanceloate Hook ecosystem.Water infiltration rate for soils of four forest types were: the inital infiltration rate of pinus massoniane was the biggest, however it's stable infiltration was the second. The soil water infiltrationrate of pinus massoniane and broad leaved forest obeyed the similar rules, that was to say, they rose or fell in the same way in which water infiltration rate of pinus massoniane was a bit higher than that of broad leaved forest. Soil of moso bamboo forest has the biggest stable infiltration rate amomg the three groups compared. Hower the infiltration of cunning hamia lanceloate Hook was just bigger than the wild meadow whose soil water infiltration rate was the lowest whatever.Factors of soil water holding capacity such as initial infiltration coefficient , stable infiltration coefficient and maximum water holding capacity had signficant corelation with soil physical and chemical properties such as bulk density, non-moso pipe soil porosities and the content of organic matter. Multi-vinearity regression equation and stepwise regression equation between them were established.Root biomass has singificant relationship with the main soil physicial and chemical properties. Still Root rug-the special level of natural broad forest was important to hydrological ecological function of forest. In this, some points about choosing the type of water conservation forest were put forward.Based on the results of the study and valued to hydrological benefits of four forests and wild meadow, it is found that both broad leaved forest and pinus massoniane have excellent water conservation capacity and moso bamboo forest has the better infiltration which could be planted in the area which has higher frequency of flung and drizzle while cunning hamia lanceloate is not proper as a type of water conservation forest because of lower water holding capacity.