期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2020
卷号：446
期号：3
DOI：10.1088/1755-1315/446/3/032025
语种：English
出版社：IOP Publishing
摘要：Large phosphate ores are located in Southwest China. Mining activities have led to serious degradation facing surrounding ecosystem, which hinders regional sustainable development. Re-vegetation is considered the ideal treatment to cope with this issue. Alnus nepalensis is considered the suitable tree species for restoration across mining sites, giving its N-fixing capacity and good adaptability. However, the growth of A. nepalensis seedling seems limited in phosphate abandoned land. In order to clarify the responses (phosphorus contents distribution and photosynthesis) of A. nepalensis seedling under high soil phosphorus stress, pot experiment was conducted. The results showed that higher soil phosphorus level leads to higher phosphorus concentrations observed in all organs of seedlings. In contract, A. nepalensis seedling's respiration rate, stomatal conductance and photosynthetic rate, all the photosynthetic parameters decreased. It found the phenomenon that phosphorus content of leaves, roots, soil and stem were negatively correlated with those photosynthetic parameters, but clear causal metabolism pathway still needs further study. Anyway, extremely high phosphorus level would inhibit the photosynthesis, and even the growth of A. nepalensis seedling, corresponding strategy is needed when we use A. nepalensis to recover phosphate abandoned land.
