高三学习计划高三学习计划范文（Senior three study plan, senior three study plan）.docVIP

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高三学习计划高三学习计划范文（Senior three study plan, senior three study plan）.doc

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高三学习计划高三学习计划范文（Senior three study plan, senior three study plan）

高三学习计划高三学习计划范文（Senior three study plan, senior three study plan） Air pollution, acid rain and dust are the main pollution. In more than 10 years, due to sulfur dioxide and nitrogen oxide emissions are increasing, the problem of acid rain is more and more outstanding. Now China is the third largest acid rain area behind Europe and North america. Acid rain can produce great harm to forest plants. According to the experimental effect of domestic on 105 woody plants, when the pH value of precipitation is less than 3, can cause direct damage to the leaves, the leaves became yellow and begin to fall. According to field investigation, the pH value of precipitation is less than 4.5 of the area, pine forest and fir forest, the emergence of a large number of yellow leaves and shedding patches of forest decline. The effects of acid rain on forest is caused by deterioration of physical and chemical properties of the soil to a great extent. Under the function of acid rain, soil nutrient elements K, sodium, calcium and magnesium will be put out, and with the rain leaching out. So the long-term acid rain will make a lot of nutrition elements in soil by leaching. Due to a serious shortage of nutrient elements in the soil, so the soil becomes barren. In addition, acid rain can make the soil in aluminum released from the stable, the soil active al increased significantly inhibited the growth of trees. Acid rain can inhibit some soil microbial growth, reduced enzyme activity in the soil, nitrogen fixing bacteria, bacteria and actinomycetes were significantly inhibited by acid rain. Acid rain can also make the forest pests and diseases increased significantly. 14, please briefly summarize the causes of acid rain. Answer: 15, the harm of acid rain on forest (no more than 50 words). Thus, resulting in forest leaves fall and decline. The fourth chapter of modern literary reading In the twenty-two analysis, induction and generalization (a) 1, please read the following text points are summe