Plantation Structure Of Pinus Massoniana And Pinus Elliottii Effect On Forest Hydrological Function

Pinus massoniana, a pioneer species in forest succession, and Slash pine is wildly used in Jiangxi artificial afforestation, the plantation area is expanding rapidly. The ecosystem degradation of artificial forest is very serious because unreasonable configuration and structure of forest category. So, how to reform the artificial forest and improve its quality and ecological hydrology function that is an important problem that in dire need to be solved.In this paper, taking Taihe county of Jiangxi Province as the experimental area and intermediate cutting and replenished broad-leaf masson pine plantation third years as study object, to analyze the precipitation distribution of different forest canopy. Take the artificial forest of pinus massoniana and slash pine of different transformation mode as study object, to analyze litter, soil hydrologic functions of different transformation mode and compare their functions. The results show that:1. In the experimental area, the amount of rainfalls is 1433.7mm, centered in April to June; and the precipitation,48.13% of the total precipitation, is 694.7mm. Moderate rain precipitation,41.33% of the total precipitation, is 596.47mm, and of the main precipitation.2. Dynamics of rainfall in the forest years studies have shown that throughfall, stem flow, Canopy interception of three kinds of forest was the highest In June, and canopy interception rate is minimum. After the adjustment of the structure of third years Pinus penetration volume, stem flow, canopy interception, surface runoff is more than pure masson pine forest..Throughfall, stemflow and the rainfall outside forest can be fitted by a linear equation, throughfall rate, stem flow rate by logarithmic equation fitting, volume and rainfall fitted the power function relationship between canopy interception, surface runoff and rainfall by exponential fitting.3. Maximun water hoiding capacity, effective retaining content of litter undecomposed layer is more than half decomposition layer, half-decomposed litter reserves greater than undecomposition level reserves. Leaf litter reserves, the maximum water holding capacity and effective capacity of mixed needle is higher, significant difference with other forest types.3 kinds of mixed forest significant difference,9 years of needle and broad-leaved mixed forest litter, holding the largest water reserves. Litter water-holding process and time using a logarithmic equation fitting, water absorption rate of litter can be exponential equation fit.Leaved water-holding rate, holding water better than pure coniferous forests, with increasing age, hydrological function of litter as possible.4. Soil bulk density of 0-10cm is less than 10-20cm, porosity, and water holding capacity is greater than 10-20cm.Needle-leaved coniferous forest soil bulk density is small, high porosity, large, has batter hydrological functions. Comparison of 21 years old of coniferous and broad-leaved mixed forest, Coniferous pure forest cover broad transformation for 9 years, Coniferous pure forest cover broad transformation 3 years of mixed forest.3 kinds of needle and broad-leaved mixed forest density differences significant, The porosity, water content significantly,21 years of coniferous and broad-leaved mixed forest is highest, fill the broad 9 years stand center, width of 3 years minimum repair stand, are more than 21 years of pure coniferous forest. As the needle and broad-leaved mixed forest stand age increases, reduced soil bulk density, porosity increases also increase the water storage capacity, has better hydrological functions.