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| Precipitation hydrochemical characteristic in virgin Pinus koraiensis forest and artifical Larix gmelinii forest in Liangshui National Nature Reserve |
| Wu Xiujuan,Cai Tijiu,Li Hua,Sheng Houcai |
| College of Forestry,Northeast Forest University,150040,Haerbin,China |
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Abstract The hydrochemical characteristic of precipitation,throughfall and stemflow in virgin Pinus koraiensis forest and artifical Larix gmelinii forest were studied in Liangshui National Natural Reserve.Inorganic nitrogen,total nitrogen,total phosphorus,potassium,calcium,natrium,magnesium as the indicators of the hydrochemical characteristic were compared.The results showed that in precipitation the highest concentration was for calcium and the lowest for total phosphorus among all analyzed nutrients,and ammonium is the most abundant inorganic nitrogen.The decreasing order of all elements contained was calcium,total nitrogen,potassium,natrium,magnesium,total phosphorus.The amount of each element was very various in terms of seasons alternate and in which the change of potassium and magnesium of throughfall and stemflow were clearly higher than those of rainfall,calcium was lower in July and higher in August and September,at the same time inorganic nitrogen presented a inverse trend,but total phosphorus was higher in virgin Pinus Koraiensis forest and lower in artifical Larix gmelinii forest.The nutrient concentrations of stemflow in two different forests were different significantly,but their trends were similar,among which potassium,calcium and magnesium of stemflow were higher than those of throughfall,since July the concentrations of total phosphorus,potassium,calcium and magnesium were higher than those of precipitation,the elements above were higher in artifical Larix gmelinii forest than those in virgin Pinus Koraiensis forest,but inorganic nitrogen was less than that of precipitation.The important basic data which came from the results can be used to study on nutrient cycle in Liangshui National Natural Reserve.
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Received: 19 January 2008
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