| In this paper,the rainfall interception of the tree canopy,the ecological function of hydrological processes,and the effects of the forest ecosystem on water quality were investigated in the forest ecosystem of Koelreuteria panicullata of Xiangtan deserted Manganese ore lands,studied the relationship between the precipitation partitioning and the atmosphere precipitation,provided basic data and reference for the ecological function of hydrological processes of Koelreuteria panicullata forest ecosystem,and also provided necessary information for the restoration and management of the wastelands due to mining of Manganese.The results were as follows:(1)The total precipitations of this system were 1360.1mm in the last 11 months.The net forest precipitation accounted for the total precipitation 82.14%,the through-fall, stem-flow and canopy interception accounted for the total precipitation 80.94%,1.2%,17.86% respectively.(2)Atmospheric precipitation pH value changed in the range of 5.39～7.60 pH,the average atmospheric precipitation pH value is 6.5, basically show neuter.The pH value had little changed among the rainfall, through-fall and stem-fall.The pH changed not very much between seasons except that dropped obviously in winter.The sequence of all kinds of water in average pH changes were from low to high as Winter<Autumn <Spring<Summer.The pH value in precipitation redistribution process was raised with rainfall increasing, but the degree was not so obvious.(3)In precipitation part,the order of mass concentrations of various chemical elements as Ca>K>NH4+-N>Mg>NO3-N>Mn>P>Zn>Cu>Fe>Cd. Among them,Ca elements had the highest level of the content in the precipitation,Cu elements was minimum.Pb was not detected in the precipitation.Mn elements showed increased trend between the through-fall and stem-flow.Fe, Zn, Pb elements showed a decrease trend in the through-fall and stem-flow.Considerable element mass concentration changes were observed among months,which represented as lower values in the rainy season and higher values in the dry season.The precipitation through precipitation Koelreuteria panicullata canopy,the elements of through-fall and stem-flow had different changes in the precipitation,when the rainfall through Koelreuteria panicullata canopy.But the overall trend was that the chemical elements in precipitation showed an increasing trend,namely: stem-flow> through-fall> precipitation.(4)After the precipitation through the canopy of Koelreuteria panicullata,the through-fall,stem-flow showed significantly nutrient leaching,and also with some extent of seasonal variation.Macro-elements in through-fall which leached through trees were higher than 1,showing a significant positive leaching.The leaching volume of micro-elements about Cu,Mn,Cd were positive,and Fe,Zn were negative,indicating that rainfall leaching the Cu and Mn which covered on the surface of Koelreuteria panicullata were washed out by the rain,and Koelreuteria panicullata adsorbed all the Fe and Zn in the precipitation.(5)Concerning the whole Koelreuteria panicullata artificial forest,the heavy mental contents as Mn,Zn,Cu which were reserved by the soil and litter,that is,the output is less than the input.lt shows that Koelreuteria panicullata artificial forest which has significant purification for this heavy mental. |
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