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次生栎林酸沉降中SO_4~(2-)含量和pH值的变化特征(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
1999年06期
Page:
5-9
Column:
研究论文
publishdate:
1900-01-01

Article Info:/Info

Title:
Studies on the Characteristics of Sulphate and pH Value in Acidic Deposition of Oak Forest Ecosystem in Xiashu
Article ID:
1000-2006(1999)06-0005-05
Author(s):
Ruan Honghua\ Jiang Zhilin\ Li Wanhua
College of Forest Resources and Environment Nanjing Forestry University\ Nanjing\ 210037
Keywords:
Oak forest Sulphate pH Precipitation
Classification number :
S718
DOI:
10.3969/j.jssn.1000-2006.1999.06.002
Document Code:
A
Abstract:
The characteristics of sulphate and pH value of precipitation, throughfall, stemflow and runoff water were studied in Xiashu Ecological Station in Jiangsu, China. The results showed as follows:(1) The sulfate (SO 2- 4) concentration of precipitation ranged from 1.07 mg/L to 22.61 mg/L. Average concentration of sulfate in throughfall and stemflow increased to 2.5 and 15 times as compared to precipitation respectively, and to 3 and 7.5 times in surface runoff and underground runoff respetively. (2) The percentage of anions in precipitation and thronghfall was about 73%~80% for SO 2- 4,8%~16% for NO - 3, 9% for Cl - and 1%~2% for F -.Ca 2+ was about 61%~72% of total cations (Ca 2+ ,Mg 2+ ,K +,Na +),17%~26% for K +,7%~8% for Na + and 3%~5% for Mg 2+ respectively. By a multiple regression analysis, SO 2- 4 concentration was very significantly correlated with Ca 2+ in precipitation and throughfall.(3) The pH value of throughfall and runoff in the oak stand was higher than that of precipitation,with cations leaching. The pH value of stemflow was lower than that of precipitation. In the loblloly pine stand, the pH value of throughfall was lower than that of precipitation.

References

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Last Update: 1900-01-01