Effects Of Different Types Of Original Pinus Korainensis Forest On Rainfall Chemistry

Forest is the main organic body for improving the environment. Water supports the entire life activity of human and the biosphere,and it is also closely related to the development of forest. The relationship between the two has become the core issue of forestry and ecology research in the field. Their relationship are not only the important components of biogeochemical cycles and energy running research, but also have a in-depth significance in the study of forest ecosystem processes, correct evaluation and understanding the function of forest ecosystem. The effects of different types of original Pinus korainensis forest on rainfall chemistry were studied in Xiaoxing’an Mountains through oriented research. The results showed that:①K+, Mg2+contents of the throughfall were highest in Pinus korainensis plantation at6.803,1.352mg/L; the average annual contents of Ca2+, Na+, Cl-were highest in Betula costata-koraiensis at12.200.2.513.3.436mg/L, respectively; Fe. Mn, SO42-contents were of the highest in Tilia amurensis-koraiensis forest at0.036.0.011,3.598; NH4+contents were of the highest in Picea sp., Abies nephlolepis-koraiensis forest at0.483mg/L.②Average contents of K+, Na+, Mn, SO42-, Cl-of stemflow were highest in Betula costata-koraiensis at9.138,6.180,0.338,9.861,7.209mg/L; Ca2+, Mg2+,Fe and NH4+contents were highest in Tilia amurensis-koraiensis forest with the average annual concentration of17.860,3.32,0.131,2.181mg/L.③K-, SO42-, Cl" contents of throughfall reached the highest value in autumn; Na+, Ca2+, NH4+contents reached the highest value in spring; Mn, Mg2+, NH4+contents were lowest in summer. All canopy generated a leaching effect on Ca2-in spring and adsorption effect in summer; Betula costata-koraiensis and Tilia amurensis-koraiensis forest absorbed, Picea sp., Abies nephlolepis-koraiensis forest and Pinus koraiensis plantation leached Ca2+in autumn. All forest types absorbed Na-except from Tilia amurensis-koraiensis forest.④K+, Na+, Mg2+, Mn, SO42-, Cl-contents of stemflow were higher in spring and lower in summer and autumn, in which Na+, Mg2+, Mn, SO42-concentration exhibited small differences between summer and autumn (P>0.05). Rainfall, throughfall, stemflow ranked differently in various substance. Mg2+, Fe, Mn and SO42-contents showed the trend of stemflow> throughfall> rainfall. For all forest types, NH4+contents of throughfall was lower than rainfall and that of the stemflow was higher than rainfall, in which NH4+contents of three original Pinus korainensis forest were significantly higher than Pinus korainensis plantations.Impacts of different types of original Korean pine forest on hydro-chemistry were analyzed. The obtained results could lay the foundation for deeper study on regional stream- water chemistry characteristics, and also provide scientific reference to configuration of regional water conservation forest.