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首页> 外文期刊>American journal of applied sciences >Comparison of Carbon and Selected Macronutrients in Forest-Floor Litter of Rehabilitated and Secondary Forests
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Comparison of Carbon and Selected Macronutrients in Forest-Floor Litter of Rehabilitated and Secondary Forests

机译：再生林和次生林地垫料中碳和选定的大型养分的比较

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Problem statement: Forest rehabilitation with human assistance by species selection and management shortens the time needed to rehabilitate degraded land as compared to natural succession. Empirical data on litter nutrient contents of tropical rain forests in Southeast Asia have been established, however it is limited to rehabilitated degraded lands. The objective of this study was to determine contents of carbon and selected macronutrients of nutrients present in the litter layer of different age stands and an adjacent secondary forest at Bintulu, Sarawak, Malaysia. Approach: Forest litter was sampled in 1 m~2 quadrates of 5 points in research plots of 20×20 m by carefully brushing off the standing litter layer on the forest floor followed by oven-drying and grinding before analysis using standard procedures for pH, carbon, nitrogen, phosphorus, potassium, calcium and magnesium. Results: Results showed that litter layer was acidic, with pH ranging from 4.4-5.1 in water and 3.7-4.4 in 1 M KC1. Carbon constituted the highest amount of element in litter, ranging from 285.6-363.9 g kg~(-1) followed by N with a range of 4.4-10.5 g kg~(-1), followed by P, ranging from 0.05-0.20 g kg~(-1). Content of K was in a range of 0.91-3.1 g kg~(-1), while Ca and Mg contents were 0.3-7.9 and 0.39-1.64 g kg~(-1) respectively. Litter layer mass and content of nutrients increased with stand age. Plots 1993, SF, 1999 and 1991 were clustered together while Plots 2002, 1996, 2005 and 2008 were in the other cluster. Stocks of nutrients in the plots were found to be in the order of C>N>Ca>K>Mg>P. Conclusion: The results are consistent with other secondary and primary forests in the tropics, suggesting that project is successful in rehabilitating degraded forests in terms of restoring nutrient availability in forest litter.
机译：问题陈述：与自然演替相比，在物种选择和管理的人工协助下进行森林恢复可缩短恢复退化土地所需的时间。关于东南亚热带雨林凋落物养分含量的经验数据已经建立，但仅限于恢复的退化土地。这项研究的目的是确定马来西亚沙捞越民都鲁不同年龄林分的凋落物层和相邻的次生林中碳的含量和某些养分的主要养分。方法：在20×20 m的研究区中，以5 m的1 m〜2的四分之一取样于森林中，方法是仔细刷掉林地上站立的枯枝落叶层，然后进行烘箱干燥和研磨，然后使用标准pH值程序进行分析，碳，氮，磷，钾，钙和镁。结果：结果表明，垫料层呈酸性，p​​H值在水中为4.4-5.1，在1 M KC1中为3.7-4.4。碳是凋落物中元素的最高含量，范围为285.6-363.9 g kg〜（-1），其次是N，范围为4.4-10.5 g kg〜（-1），其次是P，范围为0.05-0.20 g。千克〜（-1）。 K的含量在0.91-3.1g kg·（-1）的范围内，而Ca和Mg的含量分别为0.3-7.9和0.39-1.64g kg·（-1）。凋落物层的质量和养分含量随树龄的增加而增加。地块1993，SF，1999和1991聚在一起，而地块2002、1996、2005和2008处于另一个聚类。样地中的养分储量按C> N> Ca> K> Mg> P的顺序排列。结论：结果与热带地区的其他次生林和原始森林一致，表明该项目在恢复森林凋落物的养分供应方面成功地恢复了退化森林。

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