| 不同坡位马占相思人工林生长量、生物量及生长过程分析 |
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| 引用本文： | 卢佳毅.不同坡位马占相思人工林生长量、生物量及生长过程分析[J].亚热带农业研究,2016(2):79-85. |
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| 作者姓名： | 卢佳毅 |
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| 作者单位： | 福建省同安汀溪国有防护林场,福建 厦门,361100 |
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| 基金项目： | 国家自然科学基金项目(41176092)；福建省林业厅项目(闽林科〔2009〕8号)；福建省属公益类科研专项(2014R1011￣7)。 |
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| 摘 要： | 以福建省汀溪国有防护林场17 a生不同坡位马占相思(Acacia mangium)人工林为研究对象,对其生长量和生物量进行比较研究。结果表明:(1)不同坡位的马占相思人工林树高差异极显著,平均木材积差异显著,胸径均值差异不显著,下坡位生长情况最佳、中坡位次之、上坡位最差;(2)马占相思在不同坡位之间平均木及林分生物量差异均显著,各器官大小依次为:树干主根树枝树叶,侧根和细根生物量最小,平均木及林分地上部分及地下部分生物量均为:下坡位中坡位上坡位,下坡位林分持水量较大且对水源的涵养能力较强及土壤养分充足,利于植物的生物量积累;(3)不同坡位胸径、树高及材积的总生长量均呈现先快速增长、之后缓慢持续增长,生长率均随年龄的增长呈现先快速下降到稳步降低的变化趋势;(4)经显著性检验,所拟合的马占相思人工林胸径、树高、材积与树龄的生长模型,各指标拟合结果均达到极显著水平,具有较高精确度,可用于其生长评估。
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| 关 键 词： | 马占相思 坡位 生长量 生物量 生长过程 |
A comparative study on growth rate,biomass production and growth process of Acacia mangium at different hilly slopes |
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| Abstract: | The growth and biomass production of 17 year￣old Acacia mangium at different hilly slopes were comparatively studied on Tingxi State￣owned Protection Forest Farm of Tong′an in Fujian province. The result showed the following: 1) At different hilly slopes, there were highly significant differences among tree heights, significant difference among biomass volumes, but no significant difference among the diameter at breast height. The tree growth was the best at downhill slopes, better at mid￣hill slopes, and the worst at the uphill slopes. 2) Average biomass productions also showed significant differences at different slope positions in order of stem > main root > branch > leaf. The minimal biomass production was on lateral and fine roots. Overall aboveground and under￣ground biomass productions were in the order of downhill slope > mid￣hill slope > uphill slope. The higher biomass production of downhill A.mangium forest was due to relatively high moisture content and adequate soil nutrients of the downhill trees. 3)A similar growth pattern was observed for A.mangium trees at different hilly slopes:The total growth, including the diameter at breast height, tree height, and wood volume of single tree, increased rapidly at first, but then slowed down to sustained growth over time. As trees aged, the growth rate decreased rapidly first but turned to gradually later. 4) Statistical fit test results of regression equations on the diameter at breast height, tree height and single tree wood volume were extremely significant with a relatively higher accuracy, impl￣ying that these regression equations could be used to assess the growth of A.mangium trees at hilly slopes. |
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| Keywords: | Acacia mangium hilly slope position growth biomass growth process |
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