湘潭锰矿栾树叶片和土壤N、P化学计量特征  

N and P stoichiometry of Koelreuteria paniculata leaf and soil in Xiangtan Manganese Mine wasteland

作　　者：徐露燕[1,2] 田大伦[1,2] 王光军[1,2] 罗赵慧[1,2] 叶生晶[1,2] 梁贵[1,2] 

机构地区：[1]中南林业科技大学,长沙410004 [2]南方林业生态应用技术国家工程实验室,长沙410004

出　　处：《生态学报》2014年第9期2316-2322,共7页Acta Ecologica Sinica

基　　金：国家林业公益性行业科研专项(201104009);湖南省教育厅项目(湘财教字[2010]70号);长沙市科技局创新平台项目(K100300961)

摘　　要：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。To reveal the N ：P stoichiometry of foliar and soil in Koelreuteria paniculata forests, the N and P concentrations and their stoichiometry features were investigated in 3-, 5- and 9-year-old stands in Xiangtan Manganese Mine wasteland, a typical degraded ecosystem in southern China. The results showed that soil N concentrations increased with the aged stands, but soil P concentrations exhibited an opposite trend. The N,P concentrations and N ：P ratios were significantly different in leaves in the studied forests. The N and P concentrations in leaves decreased with the aged stands, while the N ：P ratios increased. Leaf N concentration was positively correlated with N ：P ratios, while P concentration was negatively correlated with N ：P ratios. There was a significant positive correlation between the soil N concentration and the leaf N ：P ratios and a strongly negative correlation between the soil P concentration and the leaf N ：P ratios. Our results indicated that P was probably the limiting factor controlling the process of plant growth in Xiangtan Manganese Mine wasteland. The results provided scientific references for vegetation restoration, management and sustainable development in the abandoned mine lands.

关 键 词：退化生态系统 N P比值 化学计量特征 相关性分析 

分 类 号：S792.99[农业科学—林木遗传育种]