竹扩张对亚热带常绿阔叶林土壤理化性质的潜在影响研究

Potential Effects of Bamboo Expansion on Soil Physical and Chemical Properties in Subtropical Evergreen Broad-Leaved Forest

毛竹(Phyllostachys pubescens)、箬竹(Indocalamus tessellatus)均具有较强的生态扩张性,引起一系列严重的生态问题,以浙江省诸暨市五洩国家森林公园内毛竹林、箬竹林、邻近阔叶林典型样地为研究对象,对比研究了3种不同类型样地土壤的理化性质差异(pH值,电导率,土壤有机碳、碱解氮、全氮、速效磷含量)。结果表明:不同覆盖类型林下土壤pH值、有机碳、碱解氮无显著差异,但电导率、速效钾差异显著,电导率表现为箬竹>阔叶林>毛竹,速效钾为箬竹>阔叶林>毛竹。表明毛竹入侵阔叶林的过程中依赖钾元素富集,土壤钾降低可能进一步影响邻近其他树种,而没有发现箬竹对养分的富集效果。旨在从毛竹和箬竹两种不同入侵竹种为突破口,揭示了不同竹种入侵对森林土壤理化性质的影响,以及可能的入侵机制。

This paper compared soil physical and chemical properties with different aboveground forest type(Phyllostachys heterocycla,Indocalamus tessellatus,and adjacent broad-leaved forest)in Wuxie National Forest Park in Zhuji City,Zhejiang Province as study objects.The results of the study showed that there were no significant differences in soil pH,organic carbon,and alkali-hydrolyzable nitrogen in different types,but significant differences in electrical conductivity and available potassium were detected.The electrical conductivity is Indocalamus tessellatus>Broad-leaved forest>Phyllostachys heterocycle,and the available potassium is Indocalamus tessellatus>broad-leaved forest>Phyllostachys heterocycle.It indicates that the invasive Phyllostachys heterocycle forest may adsorb a large amount of potassium(K)in the soil,which will significantly reduce the K in the soil,thereby affecting the growth of the broad-leaved forest.However,the invasion mechanism of Indocalamus tessellatus might has different mechanism.This study aims to use two different invasive bamboo species,Phyllostachys heterocycla and Indocalamus tessellatus,as a breakthrough point to reveal the impact of bamboo species invasion on the physical and chemical properties of soil.