The study of effects of acid rain in Southwestern China on forest ecosystems .has been inrestigated since 1984. The results have shown that the ecosystem of Pinus massoniana forest has been damaged severely by acid rain. Comparing the areas where the annual mean pH value is lower than 4.5 ...
Acid rain is a rain or any other form of precipitation that is unusually acidic and possesses elevated levels of hydrogen ions (low pH). Acid rain is caused by emissions of Sulfur dioxide and Nitrogen oxide, which react with the atomospheric water and water vapours to produce acids. Vegetatio...
A team of scientists ___ the effects of acid rain over the last twenty-year period.( ) . A. studied B. had studied C. is studying D. has been studying 相关知识点: 试题来源: 解析 D. 答案:D. 根据时间状语over the last twenty-year period可知用现在完成进行时,表示从过去开始的...
Effects of Acid Rain on Freshwater Ecosystems Acid-vulnerable areas are more numerous and widespread than believed 7 years ago. Lakes and streams in acid-vulnerable areas of northeastern North America ... DW Schindler - 《Science》 被引量: 1182发表: 1988年 Effects of acid precipitation on terres...
into the atmosphere, they react with the water, oxygen, and other gases already present there to form sulfuric acid, ammonium nitrate, and nitric acid. These acids then disperse over large areas because of wind patterns and fall back to the ground as acid rain or other forms of precipitation...
“Acid rain, or acid deposition, is a broad term that includes any form of precipitation with acidic components, such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms. This can include rain, snow, fog, hail or even dust that is acidic.“ ...
acid rain,the concentrations of quality decreased obviously.Under the treatment of weak acid,the synthesis of nutrients of pakchoi was promoted.The synthesis of chlorophyll and carotenoid were inhibited,and the photosynthesis affected by acid rain,which ultimately lead to lower production,quality ...
For many decades, acid deposition used to pose a significant regional air pollution challenge in China. After substantial emission control of anthropogenic
(i) Acid rain refers to the rainfall and other forms of precipitation with a pH of less than 5. (ii) Oxides of sulphur and nitrogen are released from automobile exhausts, industries , power plants, etc. (iii) These oxides of sulphur and nitrogen, may react with water in the air and ...
The activity of SOD in the roots and leaves decre ased with the decrease of pH value and the increase of the concentration of Zn, while the activity of POD increased in the leaves and increased first then decre ased afterwards in the root system under the stress of simulated acid rain ...