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首页> 外文学位 >A comparative study of soil disturbance from uprooted trees, and mound and pit decay in Puerto Rico and Colorado.
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A comparative study of soil disturbance from uprooted trees, and mound and pit decay in Puerto Rico and Colorado.

机译：波多黎各和科罗拉多州连根拔起的树木对土壤干扰以及土丘和坑洼的比较研究。

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摘要

The toppling of trees forms mounds of disturbed sediment and pits from which the mound removes sediment, rocks, and organic matter. Sites of uprooted trees in Puerto Rico and Colorado were examined (1) to compare areas and volumes of mounds and pits relative to tree size, (2) to compare areas and volumes of mounds and pits formed during catastrophic events at the landscape scale, and (3) to consider decay of mounds and pits after formation. For a given basal area, the analyses found no difference among sites in area and volume of freshly formed individual mounds and pits. For landscape-level catastrophic uprooting, the percent of toppled trees in a plot can explain 85% and 87% of the areas and volumes, respectively, of the quantity of soil uplifted. Exponential decay coefficients developed by monitoring mound/pit complexes indicate that mounds and pits at the humid tropical site in Puerto Rico decay in about 74% and 57% of the time, respectively, of mounds and pits at a temperate Colorado site. Decay coefficients developed for the Colorado site indicate that mounds and pits are reduced to 10% of their original volume within 30 and 78 years, respectively. Coefficients for Puerto Rico suggest that a similar reduction in volume requires 17 years, whereas pits generally fill within a decade.
机译：树木的倒塌形成乱堆的沉积物和坑丘，土丘从中清除沉积物，岩石和有机物。检查了波多黎各和科罗拉多州连根拔起的树木的位置（1）比较山丘和坑的面积和体积与树木大小的关系，（2）比较景观事件期间在灾难性事件中形成的山丘和坑的面积和体积，以及（3）考虑土丘和坑在形成后的腐烂。对于给定的基础区域，分析发现新形成的单个土墩和矿坑的面积和体积在站点之间没有差异。对于景观级的灾难性连根拔起，一块地块中倒下的树木所占的比例分别可以解释占隆起土壤量的85％和87％。通过监测丘/坑复合体形成的指数衰减系数表明，波多黎各潮湿热带站点的丘和坑分别在温带科罗拉多站点的丘和坑中分别腐烂约74％和57％。针对科罗拉多场址的衰减系数表明，土墩和矿坑分别在30年和78年内减少到其原始体积的10％。波多黎各的系数表明，体积的类似减少需要17年，而矿坑通常在十年之内就可以填满。

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  • 作者

    Lenart, Melanie Therese.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Geology.;Agriculture Soil Science.;Agriculture Forestry and Wildlife.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 175 p.
  • 总页数 175
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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