Precipitation Levels of Typical Forest Stand in Mid-subtropical Zone: Variation Characteristics of Water Quality

doi:10.11924/j.issn.1000-6850.casb17040103

Abstract

Abstract: To investigate water quality at different levels of subtropical forest ecosystem, we studied water quality effect of precipitation through fall, runoff and soil leachate of evergreen broad-leaved forest in Jinyun Mountain, Chongqing from September 2013 to August 2014. The results showed that: the precipitation of Jinyun Mountain was obviously acidic (pH 4.75); the soil and canopy could elevate the pH value of precipitation, and the soil layer had the biggest up-grading of the pH value, followed by forest canopy; forest canopy layer had certain adsorption effect on NO3-、NO2- and Na+, the NH4+、SO42-, PO43-, Mg2+, Ca2+ and K+ on forest canopy could be leached by precipitation; in addition, the inorganic and organic matter produced by the litter degradation increased ion concentration in surface runoff; functional group and colloid in forest soil could adsorb and neutralize NO3-, SO42-, NH4+, PO43-, K+, Mg2+ in leachate; at the same time, forest soil under acidic condition for a long term could release part of the Na+, NO2-, PO43- and Ca2+; the contents of heavy metal lead (Pb) and cadmium (Cd) were relatively high in the atmospheric rainfall in the area, but showed a dramatic drop after going through the forest canopy, indicating that the forest canopy had stronger intercept purification effect on heavy metals such as Pb and Cd.

CLC Number:

S158.3

张淑芬 and . Precipitation Levels of Typical Forest Stand in Mid-subtropical Zone: Variation Characteristics of Water Quality[J]. Chinese Agricultural Science Bulletin, 2017, 33(22): 47-52.

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