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Seed germination and seedling emergence of four tree species of southern China in response to acid rain

Journal of Forestry Research 2021年第2期32卷 471-481页

作者： Matoor Mohsin Gilani Mulualem Tigabu Bo Liu Taimoor Hassan Farooq Muhammad Haroon URashid Muhammad Ramzan Xiangqing Ma Forestry College Fujian Agriculture and Forestry UniversityFuzhou 350002People’s Republic of China Fujian Provincial Colleges and University Engineering Research Center of Plantation Sustainable Management Fuzhou 350002People’s Republic of China Faculty of Forest Science Southern Swedish Forest Research CenterSwedish University of Agricultural SciencesP.O.Box 4923053 AlnarpSweden National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China Central South University of Forestry and TechnologyChangsha 410000People’s Republic of China School of Soil and Water Conservation and Desertification Combating Beijing Forestry UniversityBeijing 100083People’s Republic of China

Acid rain has become a major concern due to increasing atmospheric pollution,particularly in *** investigated whether acid rain inhibits the germination of seeds and subsequent emergence of seedling of four tree species from southern China:Cunninghamia lanceolata,fokienia hodginisi,Pinus massoniana and Phoebe zhennan by simulating acid rain with pH of 2.5,3.5,4.5 and *** hypothesized that the inhibitory effect of acid rain on germination of seeds and emergence of seedling varies between species and the degree of acidity.A solution of 1 N H2SO4 and 1 N HNO 3 in the ratio of 10–1 was prepared and diluted to four pH levels,and seeds were supplied with solutions of these pH values and distilled water as control and tested for germination in a controlled growth *** results revealed that simulated acid rain of pH 2.5 adversely affected the germination capacity of *** and ***;while all acid solutions significantly increased germination of ***;but had no effect on germination of *** *** acid solution(pH of 2.5)adversely affected elongation of radicle and hypocotyl as well as fresh and dry weights of radicle and hypocotyl of tender *** result demonstrated that seedling emergence is more sensitive than seed germination to simulated acid rain,and germination of conifer species are less sensitive than broad leaved species to simulated acid *** a whole,acid rain of pH of 3.5 is the threshold level and acid rain below this value will have a detrimental effect on seed germination and seedling emergence.

关键词： Cunninghamia lanceolata fokienia hodginisi Pinus massoniana Phoebe zhennan Seed viability Simulated acid rain

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