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首页> 外文期刊>American journal of applied sciences >Comparing the Fertility of Soils under Khaya ivorensis Plantation and Regenerated Degraded Secondary Forests
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Comparing the Fertility of Soils under Khaya ivorensis Plantation and Regenerated Degraded Secondary Forests

机译：象牙海（Khaya ivorensis）人工林和退化退化次生林下土壤肥力的比较

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Problem statement: It is widely accepted that conversion of natural forest to other land use types leads to deterioration of soil fertility and increased soil compaction which consequently become degraded secondary forests. Degraded secondary forest is indicated by low soil fertility and organic matter due to imbalance input and output from original vegetation. Forest plantation through planting fast growing exotic species is usually implemented to curtail degradation of secondary forest or forestland and to improve the soil fertility through organic matter accumulation. However, fundamental information on degraded forestland being converted to forest plantation using exotic species such as Khaya ivorensis is not available. The objectives of this study were: (1) to characterize the properties of three degraded soils under rehabilitation using K. ivorensis; and (2) to evaluate their fertility status by Soil Fertility Index (SFI) and Soil Evaluation Factor (SEF). Approach: This study was concentrated on three soil series (Rengam, Durian and Padang Besar) found under K. ivorensis plantation and at the adjacent secondary forest in Segamat, Johor, Malaysia. To characterize and evaluate the soil fertility status for each soil series, three plots (30 x 40 m) were randomly established on each soil series. Soils for each series were sampled at the depth of 0-10 cm (surface soil) and 20-30 cm (subsurface soil). They were randomly collected at six different points for each replicate. Soil analyses were carried out physical and chemical properties. Results: The soils both in planted and secondary forests were moderately acidic to slightly acidic with low content of exchangeable bases and available P but high in Al saturation. The Rengam series under K. ivorensis plantation contained higher total carbon and clay compared with those of Padang Besar and Durian series. Clay and total carbon contents were highly correlated with the Cation Exchange Capacity (CEC), indicating the potential of negative charge produced by the clay and organic playing an important role in supplying and holding plant nutrients. The SFI result revealed that soil fertility status of Rengam soil was significantly higher than the other two soil series. There was no significant difference observed for SEF. Based on SFI and SEF values, there were no significant differences of fertility status between the planted and secondary forests for both soil depths. Conclusion: This study revealed that Rengam soil is more fertile than the other two soils. Based on the using SFI and SEF it can be concluded that fast growing exotic species of K. ivorensis has the potential to improve site productivity and soil fertility.
机译：问题陈述：天然林转换为其他土地利用类型会导致土壤肥力下降和土壤压实度增加，从而成为退化的次生林，这一点已被广泛接受。由于原始植被输入和输出的不平衡，退化的次生林表现为土壤肥力和有机质较低。通常通过种植快速生长的外来物种来植树造林，以减少次生林或林地的退化，并通过有机物质的积累来改善土壤肥力。但是，尚无有关使用异种物种（例如Khaya ivorensis）将退化林地转变为人工林的基本信息。这项研究的目的是：（1）表征使用象牙草进行修复的三种退化土壤的特性； （2）通过土壤肥力指数（SFI）和土壤评价因子（SEF）评估其肥力状况。方法：本研究集中在三个物种系列（Rengam，Durian和Padang Besar）上，该物种在K. ivorensis人工林下以及马来西亚柔佛州昔加末的相邻次生林中发现。为了表征和评估每个土壤系列的土壤肥力状况，在每个土壤系列上随机建立了三个样地（30 x 40 m）。每个系列的土壤均在0-10厘米（表层土壤）和20-30厘米（表层土壤）的深度取样。每次重复在六个不同点随机收集它们。进行了土壤分析的物理和化学性质。结果：人工林和次生林中的土壤均为中酸性至弱酸性，可交换碱含量低，有效磷含量高，但铝饱和度高。与巴东Besar和榴莲系列相比，象牙草人工林下的Rengam系列含有更高的总碳和黏土。粘土和总碳含量与阳离子交换容量（CEC）高度相关，表明粘土和有机物产生的负电荷潜力在供应和保持植物养分方面发挥着重要作用。 SFI结果表明，Rengam土壤的土壤肥力状态显着高于其他两个土壤系列。 SEF没有观察到显着差异。根据SFI和SEF值，两种土壤深度的人工林和次生林的肥力状况均无显着差异。结论：这项研究表明，雷甘土壤比其他两种土壤更肥沃。根据使用SFI和SEF的结论，可以得出结论，快速生长的科特迪瓦（K. ivorensis）外来物种具有提高站点生产力和土壤肥力的潜力。

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