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粤西地区4种典型人工林土壤碳、氮、磷养分垂直分布特征

Vertical distribution characteristics of soil carbon,nitrogen and phosphorus nutrients in four typical plantations in western Guangdong
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摘要 【目的】土壤碳(C)、氮(N)、磷(P)生态化学计量比是反映森林生态系统养分变化的重要指标。研究旨在探明粤西地区不同林分类型的土壤C、N、P养分的垂直分布特征及其与化学计量特征之间的关系。【方法】以广东省阳江市国有花滩林场的马占相思Acacia mangium、加勒比松Pinus caribaea、尾叶桉Eucalyptus urophylla和灰木莲Magnoliaceae glanca四种典型人工林为研究对象,对不同土层(0~10、10~20、20~40、40~60、60~100 cm)的土壤总有机碳(TOC)、全氮(TN)、全磷(TP)和速效磷(AP)等指标进行测定,探讨不同人工林类型土壤C、N、P的垂直变化及其化学计量特征。【结果】不同林分类型和土层深度的土壤TOC、TN存在显著差异,土壤TOC和TN含量随着土层深度的增加而减少,在不同林分间表现为马占相思>加勒比松>尾叶桉>灰木莲,土壤TP在不同林分类型和土层深度间的含量相对比较稳定。马占相思林、加勒比松林、尾叶桉林和灰木莲林的土壤C∶N、C∶P、N∶P分别为7.45~8.09、10.14~16.59和1.35~2.18,均低于全国土壤平均水平。相关性分析结果表明,4种林分的土壤TOC与TN、C∶N与C∶P均呈极显著正相关关系,土壤含水量(SWC)和pH值会影响土壤C、N、P含量以及生态化学计量学特征。【结论】马占相思林有较好的养分归还和地力维持的效果,在人工林营建过程中可以通过适当种植固氮树种达到土壤肥力改良的目的。 【Objective】Ecological stoichiometric ratio of soil carbon(C),nitrogen(N)and phosphorus(P)was an important index to reflect the nutrient change in forest ecosystem.The purpose of this paper was to explore the vertical distribution characteristics of soil C,N and P nutrients of different plantation types in western Guangdong and their correlation with stoichiometric characteristics.【Method】Four typical plantations of state-owned Huatan forest farm in Yangjiang city,Guangdong province were selected.Taking Acacia mangium,Pinus caribaea,Eucalyptus urophylla and Magnoliaceae glance as research objects,this study explored soil TOC,TN,TP and AP in five different soil layers(0-10 cm,10-20 cm,20-40 cm,40-60 cm,60-100 cm)at 100 cm depth of four plantations,and the vertical variation and stoichiometric characteristics of soil C,N and P in the planation were discussed.【Result】There were significant differences in TOC and TN contents among different plantation types and soil depth.TOC and TN contents decreased with the increase of soil depth,and the contents of TOC and TN in soil were as followed:A.mangium>P.caribaea>E.urophylla>M.glance.The contents of TP were relatively stable among different stand types and soil depth.The soil C∶N,C∶P,N∶P of A.mangium,P.caribaea,E.urophylla and M.glance were 7.45-8.09,10.14-16.59,and 1.35-2.18,respectively,which were all lower than the national average.The correlation analysis showed that soil TOC were significantly positively correlated with TN,C∶N and C∶P,and soil SWC and pH affected soil C,N and P contents as well as ecological stoichiometric characteristics.【Conclusion】The plantation of A.mangium has better soil nutrient return and fertility maintain ability.In the process of plantation construction,soil fertility improvement can be achieved by proper planting of nitrogen-fixing trees.
作者 吴妙兰 顾晓娟 刘悦 刘林云慧 刘亚蕾 吴文宇 周林菲 莫其锋 WU Miaolan;GU Xiaojuan;LIU Yue;LIU Linyunhui;LIU Yalei;WU Wenyu;ZHOU Linfei;MO Qifeng(College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,Guangdong,China;Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm,South China Agricultural University,Guangzhou 510642,Guangdong,China;CFERN Guangdong E’huangzhang Field Observation and Research Station,Yangjiang 529631,Guangdong,China)
出处 《中南林业科技大学学报》 CAS CSCD 北大核心 2024年第10期116-125,共10页 Journal of Central South University of Forestry & Technology
基金 广东省林业科技创新项目(2022KJCX017) 广东省基础与应用基础研究基金项目(2023A1515012129)。
关键词 林分类型 化学计量比 土壤养分 垂直分布 固氮树种 人工林 stand type stoichiometry soil nutrient vertical distribution nitrogen-fixing trees plantation
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