• 中国中文核心期刊
  • 中国科学引文数据库(CSCD)核心库来源期刊
  • 中国科技论文统计源期刊(CJCR)
  • 第二届国家期刊奖提名奖

Citation:

Influence of Water Content and Temperature on the pH values of Solution Extracted from Acidified Forest Floor Materials of Norway Spruce

  • Received Date: 1997-07-22
  • The influence of temperature and water content during incubation on the pH values of solutions extracted with saturated water content from the strongly acidified and NH4+-riched forest floor materials (OL-,OF-and OH-layers) of Norway spruce was investigated under manipulated conditions for one year.During the incubation there were no element input,element leaching and plant uptake,but the gas exchange with the atmosphere was relatively free.There were 3 temperature treatments (with annual average air temperature of 11.6,12.3 and 14.5 ℃ respectively) and 4 water content treatments (from nearly air dry to the saturation of each material).Drought led to a significant decrease of pH value.In the extreme drought treatment,the extracted H+ amounted to 2.2~2.7 times of that of the starting phase.In order to avoid a sharp decrease of pH value,a saturation degree of 60%~80% for the forest floor materials should be maintained.If it is smaller than about 30% for the OL and 50% for the OF-and OH-material,the pH value will be lowered compared with the starting phase.Surprisingly,ammonia volatilization can take place under drought conditions,even in the strongly acidified forest floor materials which have a high content of NH4+.Furthermore,ammonia volatilization plays the most important role in the decrease of pH value.On the contrary the influence of warming was not significant in the applied temperature range.
  • 加载中
  • 加载中
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Article views(2993) PDF downloads(1042) Cited by()

Proportional views

Influence of Water Content and Temperature on the pH values of Solution Extracted from Acidified Forest Floor Materials of Norway Spruce

  • 1. The Institute of Forest Ecology and Environmental Sciences, CAF Beijing 100091
  • 2. The Institute of Soil Sciences and Forest Nutrition, 37077 Gö
  • 3. ttingen, Germany

Abstract: The influence of temperature and water content during incubation on the pH values of solutions extracted with saturated water content from the strongly acidified and NH4+-riched forest floor materials (OL-,OF-and OH-layers) of Norway spruce was investigated under manipulated conditions for one year.During the incubation there were no element input,element leaching and plant uptake,but the gas exchange with the atmosphere was relatively free.There were 3 temperature treatments (with annual average air temperature of 11.6,12.3 and 14.5 ℃ respectively) and 4 water content treatments (from nearly air dry to the saturation of each material).Drought led to a significant decrease of pH value.In the extreme drought treatment,the extracted H+ amounted to 2.2~2.7 times of that of the starting phase.In order to avoid a sharp decrease of pH value,a saturation degree of 60%~80% for the forest floor materials should be maintained.If it is smaller than about 30% for the OL and 50% for the OF-and OH-material,the pH value will be lowered compared with the starting phase.Surprisingly,ammonia volatilization can take place under drought conditions,even in the strongly acidified forest floor materials which have a high content of NH4+.Furthermore,ammonia volatilization plays the most important role in the decrease of pH value.On the contrary the influence of warming was not significant in the applied temperature range.

Catalog

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return