毛竹向杉木林扩展对土壤养分含量及计量比的影响
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引用本文:范少辉,申景昕,刘广路,冯 云,刘希珍,蔡春菊.毛竹向杉木林扩展对土壤养分含量及计量比的影响[J].西北植物学报,2019,39(8):1455~1462
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范少辉,申景昕,刘广路*,冯 云,刘希珍,蔡春菊 (国际竹藤中心 竹藤科学与技术重点实验室北京 100102) 
基金项目:十三五重点研发课题(2018YFD0600103);
中文摘要:该研究以毛竹(Phyllostachys edulis) 杉木(Cunninghamia lanceolata)林扩展界面为研究对象,通过对比分析不同扩展阶段土壤有机碳(SOC)、全氮(N)、全磷(P)、碱解氮(H N)、有效磷(A P)含量及其相关性,揭示毛竹扩展对土壤养分以及化学计量特征的影响,为毛竹林合理调控与生态经营提供依据。结果表明:(1)毛竹向杉木扩展过程中,随着毛竹所占比例的增加,土壤SOC含量呈先升高后降低的趋势,且随土层的加深SOC的变异系数逐渐增加;N含量呈先升高后下降的变化趋势,且扩展后期大于扩展前期;P、H N和A P含量随着毛竹的扩展呈升 降 升 降的波浪型变化趋势,扩展后期P与A P的含量低于扩展前期,且H N含量大于扩展前期。(2)毛竹向杉木扩展过程中,C∶N随着毛竹的扩展呈上升趋势,且不同扩展阶段的差异达到了显著水平; N∶P随着毛竹的扩展呈上升的趋势,其中0~20 cm土层各扩展阶段间的差异达到显著水平;H N∶A P随着毛竹的扩展呈先上升后降低的趋势,不同扩展阶段的差异达到了显著水平,且扩展后期小于扩展前期。(3)C、N、P与C∶N、N∶P、H N∶A P存在显著的相关性,其中C、N与H N∶A P,以及P与N∶P、H N∶A P均呈显著负相关关系。研究表明,随着毛竹向杉木林的扩展,立地土壤养分状况发生了规律性变化,N、P元素更加缺乏,建议及时补充N、P元素,促进群落健康稳定发展。
中文关键词:毛竹  扩展  杉木  土壤养分  化学计量比
 
Soil Nutrients and Ecological Stoichiometry Characteristics after Phyllostachys edulis Expansion to Cunninghamia lanceolata Forest
Abstract:In this study, taking the interface of moso bamboo (Phyllostachys edulis) Chinese fir (Cunninghamia lanceolata) forest as the research object, we compared and analyzed contents and correlations of soil organic carbon (SOC), total nitrogen (N), total phosphorus(P), alkali hydrolyzed nitrogen(H N) and available phosphorus(A P) at different expansive stages to reveal the effects of moso bamboo expansions on soil nutrients and stoichiometric characteristics, and to provide basis for rational regulation and ecological management of moso bamboo forest. The study shows: (1) for moso bamboo to Chinese fir, with the increase of moso bamboo proportion, the content of SOC increased first and then decreased, and the coefficient of variation of SOC increased gradually with the deepening of soil layer; the content of N increased first and then decreased, and the final stage of expansion is higher than the initial stage of expansion; The contents of P, H N and A P showed wave like change trend with the expansion of moso bamboo. The contents of P, H N and A P in different expansion stages reached significant levels. The contents of P and A P in final expansion stage were lower than that in initial expansion stage, and the content of H N was higher than that in initial expansion stage. (2) During the expansion of moso bamboo to Chinese fir, C∶N showed an upward trend with the expansion of moso bamboo, and the difference between different expansion stages reached a significant level; N∶P showed an upward trend with the expansion of moso bamboo. The difference of N∶P in 0-20 cm soil layers reached a significant level, while that in 20-30 cm soil did not reach a significant level. H N∶A P increased first and then decreased with the expansion of moso bamboo, and the difference between different expansion stages reached a significant level, and the final expansion stage was smaller than the initial expansion stage. (3) SOC, N, P and C∶N, N∶P, H N∶A P are significantly correlated, and the correlation coefficient reaches a significant level. Among them, SOC and N are negatively correlated with H N∶A P, P is negatively correlated with N∶P and H N∶A P. This reflects that with the expansion of bamboo, soil N and P elements were more scarce. It is suggested that N and P elements be supplemented in time to promote the stable and healthy development of community.
keywords:Phyllostachys edulis  expansion  Cunninghamia lanceolata  soil nutrient  stoichiometry
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