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Study of Leaching Natures and Soil Chemical Characteristics of Typical Forests under Acid Rain Stress

Author: LiJia
Tutor: LiWei
School: Beijing Normal University
Course: Environmental Science
Keywords: Acid Rain Forest Canopy Leaching Soil acidification Guizhou
CLC: X517
Type: Master's thesis
Year: 2010
Downloads: 113
Quote: 0
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Abstract


The acid rain pollution is a major environmental problems our country is currently facing one of its long-term effects can cause the forest ecosystem recession even death. Guizhou Province is one of China's the southern acid rain pollution affected provinces to study the the Guizhou region's acid rain status quo and its impact on the ecology of the forest system of protecting existing local forest resources, to reduce the harm caused by acid rain on the environment is of great significance. In this study, Guizhou Long Lane Eco Park region as the study area, the use of field monitoring and laboratory analysis method of combining study the impact of acid rain on the typical local forest communities and their feedback. With the April 2007 2 008 December precipitation, vegetation canopy penetration penetration of water, soil and soil water monitoring results, preliminary the local study period acid rain pollution status, chemical composition characteristics and trend analysis and comparison of the leaching patterns of acid rain on both pure pine forest and mixed coniferous typical vegetation communities, explore of the two vegetation corresponds forest soil acidification status and possible causes. The main findings are as follows: 1. Acid rain pollution situation and trend analysis of the study area (1) local acid rain is sulfuric acid rain, the frequency of the occurrence of acid rain study period more than 70% of the acid rain pollution render exacerbate trends. (2) acid rain occurrence was some seasonal variation, spring for the acid rain period of high frequency of acid rain in summer decline. (3) only consider the case of wet deposition of sulfur and nitrogen settlement amount does not exceed the critical load values. Leaching Law of typical vegetation canopy (1) two canopy throughfall pH value relative precipitation there is a certain elevated mixed coniferous throughfall variation of the pH value is less than the masson pine forest. (2) precipitation the two canopy through water than outside NH 4 ion content are greatly increased, the the cation precipitation total is greater than anion, could easily lead to the long-term role of the forest canopy acidification. (3) two canopy of NH 4 strong absorption, absorption of NO 3 - , can be to some extent alleviate soil acidification. Crown chromatography (4) acid rain effect the largest quantity of the Mg 2 K Ca 2 and other nutrients ions, under the long-term effects of likely to cause forest nutrient losses directly affect forest growth. Soil chemical properties under the Acid Rain Stress Analysis (1) acid rain after the different depths of the forest soil pH value decreased by 0.2 1 .3 units, and Al 3 the hg 2 , toxic and hazardous the Pb 2 ion content increased significantly. (2) the two forests corresponds to the soil showed acidic the Pinus forest corresponds soil more acidic. (3) soil in and H as well as the adsorption SO42-and NO , 3 - acid rain in the anion may to some extent alleviate the adverse effects of acid rain, which in the upper soil and the ability of foreign H strongest. (4) long-term acid rain stress cause the soil of the study area SO42-adsorption capacity and higher Ca content in the local soil, forest vegetation of the study area did not show significant acid induced damage.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Acid rain
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