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湘潭锰矿区废弃地是一个典型的退化生态系统,针对矿区废弃地植被恢复中3个不同林龄的栾树林(3年生、5年生和9年生),测定了林木叶片以及相应土壤的N、P含量,综合分析了不同林龄土壤和林木叶片的化学计量特征。结果表明,随着年龄的增长土壤中N含量呈递增趋势,而P含量为递减趋势,在3个林龄中均表现出显著性差异;3个林龄叶片的N、P含量以及N∶P比值差异显著,N、P含量在年龄增长梯度上表现为降低,而N∶P比值却表现为升高;3个林龄叶片中N含量与N∶P比值之间表现出显著正相关,而P含量与N∶P比值之间却为显著负相关关系;土壤中N、P含量与叶片N∶P比值之间分别存在显著正相关和负相关关系。通过对3个林龄叶片和土壤N、P含量及化学计量特征研究,发现P很有可能成为湘潭锰矿退化生态系统植被恢复过程中植物生长的限制性因子。研究结果可为矿区废弃地植被恢复和经营管理以及森林可持续发展提供科学依据。
The abandoned land in Xiangtan Manganese Mine Area is a typical degraded ecosystem. According to the three different age stands of Luanlin (3 years, 5 years and 9 years old) in the abandoned vegetation in the mining area, the N, P Content, a comprehensive analysis of the stomatal characteristics of soil and forest leaves of different ages. The results showed that with the increase of age, the content of N in soil showed an increasing trend and the content of P decreased gradually, showing significant differences among the three stands. The contents of N and P, N:P The ratio of N and P contents decreased significantly in the gradient of increasing age, while the ratio of N:P increased. The content of N and P:N in the three age-old leaves showed a significant positive correlation There was a significant negative correlation between P content and N: P ratio. There was a significant positive correlation and a negative correlation between N and P contents and N: P ratio in soil. By studying the N and P contents and stoichiometric characteristics of three plantation age leaves and soil, it was found that P is likely to be the limiting factor of plant growth during vegetation restoration of the degraded ecosystem of Xiangtan manganese mine. The results can provide a scientific basis for vegetation restoration, management and management and sustainable forest development in abandoned mining areas.