Studies On The Water Holding Capacity Of Litter Layers And Soil Layers In Main Forest Types In The Watershed Of Qinhuai River

Through studying different kinds of forest types of the water holding capacity of the litters and soil concretely, to find out the ideal forest types of watershed of Qinhuai River and provide a scientific basis for the water conservation forest managment, the conclusion as follows:1.The leaf litter accumulation of the seven main kinds of forest types ranged form 7.30—17.51t·hm-2. The leaf litter accumulation of different kinds of forest typeshowed an increasing trend after the first reduction during the growing season.2.The interception capacity of leaf litter on the seven main kinds of forest type ranged form 10.251—37.93t·hm-2, The largest one is Quercus acutissima Carruth-Cunninghamia Lanceolata mixed forest,followed by Celtis sinesis Pers-Kalopanax septemlobus (Thunb.)Koidz mixed forest.3.Both logarithm and power function relationship were presented between water holding capacity and water-immersing time, water absorption velocity and water-immersing time in 7 types of forest types respectively.4.The soil density of the 7 main kinds of forest type ranged form 1.08—1.56g/cm3, the results indicated that the soil density of Quercus acutissima Carruth-Cunninghamia Lanceolata mixed forest is least in all the seven forest types, Pinus elliottii pure forest is the biggest.The results showed that thinning measures can make the soil non-capillary porosity increased, and made the total porosity and capillary porosity reduced.5.The effective water capacity of the seven main kinds of forest types ranged form 523.4—1171.0t/hm2, The largest one is Celtis sinesis Pers mixed forest,and the lowest one is Pinus elliottii pure forest.There existed an extremely definite relationship between the effective water capacity of soil and its total porosity,capillary porosity, non-capillary porosity and the ventilation, and a significant relationship between the effective water capacity of soil and the simpson index. Thinning measures can increase the soil effective water capacity obvious, the reason is that thinning measures can increse the non-capillary porosity.6.There existed an extremely definite relationship between the initial infiltration rates of soil and its capillary porosity, and a significant relationship between that and the total porosity. There also existed an extremely definite relationship between the stable infiltration rate of soil and its capillary porosity, total porosity, and a significant relationship between that and non-capillary porosity and the ventilation. Power function relationship was presented between water infiltration rate and time in 7 main kinds of forest types respectively.