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

作　　者：Matoor Mohsin Gilani Mulualem Tigabu Bo Liu Taimoor Hassan Farooq Muhammad Haroon URashid Muhammad Ramzan Xiangqing Ma 

机构地区：[1]Forestry College,Fujian Agriculture and Forestry University,Fuzhou 350002,People’s Republic of China [2]Fujian Provincial Colleges and University Engineering Research Center of Plantation Sustainable Management,Fuzhou 350002,People’s Republic of China [3]Faculty of Forest Science,Southern Swedish Forest Research Center,Swedish University of Agricultural Sciences,P.O.Box 49,23053 Alnarp,Sweden [4]National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China,Central South University of Forestry and Technology,Changsha 410000,People’s Republic of China [5]School of Soil and Water Conservation and Desertification Combating,Beijing Forestry University,Beijing 100083,People’s Republic of China

出　　处：《Journal of Forestry Research》2021年第2期471-481,共11页林业研究（英文版）

基　　金：supported by the Innovation and Industrialization Project of Advanced Generations of Chinese Fir in Fujian Forestry Department(ZYCX-LY-2017004);the Science and Technology Major Project of Fujian Province,China(2018NZ0001-1).

摘　　要：Acid rain has become a major concern due to increasing atmospheric pollution,particularly in China.We 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 5.5.We 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 chamber.The results revealed that simulated acid rain of pH 2.5 adversely affected the germination capacity of F.hodginisi and P.zhennan;while all acid solutions significantly increased germination of P.Massoniana;but had no effect on germination of C.Lanceolata seeds.Strong 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 seedlings.The 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 rain.As 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 

分 类 号：S718.43[农业科学—林学]