| 马尾松、桉树及其混交林土壤养分变化特征及评价 |
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| 引用本文： | 郭东强,黄晓露,任世奇,卢翠香,黄锦芬,陈健波,项东云.马尾松、桉树及其混交林土壤养分变化特征及评价[J].桉树科技,2015(3):14-21. |
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| 作者姓名： | 郭东强 黄晓露 任世奇 卢翠香 黄锦芬 陈健波 项东云 |
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| 作者单位： | 1. 广西林业科学研究院，广西 南宁 530001; 国家林业局中南速生材繁育实验室，广西 南宁 530001; 广西优良用材林资源培育重点实验室，广西 南宁 530001;2. 广西国营渠黎华侨林场,广西 扶绥,532103 |
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| 基金项目： | 广西科技厅基本科研业务费项目，广西林业科技项目 |
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| 摘 要： | 研究马尾松纯林、桉树纯林和3种不同模式混交林土壤养分含量的变化规律，并对其土壤养分状况进行主成分综合排序。结果表明：土壤有机质、全 N、全 P、水解 N、速效 P 和速效 K 皆表现为随土壤深度增加而减少，全 K 则表现相反；在各林分中，桉树纯林的土壤有机质、速效 P 含量最高，混交林次之。混交林则土壤全 N、全P 和速效 N 含量总体上大于纯林。马尾松纯林除在浅层土中速效 P 含量最高外，其他养分指标都低于桉树纯林和混交林。土壤养分综合评价为桉树纯林＞混交林 A＞混交林 C＞混交林 B＞马尾松纯林，表现为桉树纯林养分状况最好，马尾松纯林最差，与针阔树种的生长特性和凋落物养分归还能力有关。混交林中种植密度较大的混交林A 养分状况相对较好，表明其养分储存能力较好，消耗较少。而相同种植密度下，混交林 C 的林分土壤养分状况优于混交林 B。
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| 关 键 词： | 马尾松 桉树 混交林 土壤养分 |
Characteristics and Evaluation of Soil Nutrients of Pinus massoniana,Eucalyptus and Mixed Plantations |
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| Abstract: | Soil nutrients under Pinus plantations, Eucalyptus plantations and 3 mixed species plantations were examined in this study using principal component analysis (PCA). Results showed that soil organic matter, total N, total P, hydrolysis N, available P and available K all decreased as soil depth increased while total K showed the opposite trend. The highest percentages of soil organic matter and available P were found in soils under the pure Eucalyptus plantations with those in the soils under mixed forests ranking second. The total N, total P and available N content of soils under mixed forests were generally greater than of those under pure species plantations. Soils under Pinus plantations generally had the highest available P contents, whilst other nutrient indicators in these soils were lower than either pure Eucalyptus or mixed species plantations. For overall soil nutrient status the forest types were ranked in the following order: pure Eucalyptus plantations > Mixed A> Mixed C> Mixed B> pure Pinus plantations. That pure Eucalyptus plantations had superior soil nutrient status whilst pure Pinus plantation had the poorest soil nutrient status was related to differences in conifer and broadleaf species growth characteristics and litter nutrient return ability. Mixed A, which had a higher tree density, appeared to have better soil nutrient storage capacity, whilst Mixed C had better soil nutrient status than Mixed B despite having the same planting density. |
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| Keywords: | Pinus massoniana Eucalyptus mixed forests soil nutrient |
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