...
首页> 外文期刊>Soil Science Society of America Journal >Organic Soils on Basaltic Lava Flows in a Cool, Arid Environment
【24h】

Organic Soils on Basaltic Lava Flows in a Cool, Arid Environment

机译:凉爽,干旱环境下玄武岩熔岩流上的有机土壤

获取原文
获取原文并翻译 | 示例
           

摘要

Holocene-aged basaltic lava flows offer a unique opportunity to study the initial stages of soil formation. In the cool, dry climate at Craters of the Moon National Monument and Preserve (CROM) in southern Idaho, organic soils (Histosols in Soil Taxonomy) are the dominant soil on recent lava surfaces. Unsaturated Histosols, or Folists (Folic Histosols in World Reference Base [WRB]), occupy crevices and depressions on the lava surface and support vegetation adapted for life in this harsh environment. These soils are comprised of either a thin fibric (Oi horizon) over a hemic (Oe horizon) or a single, relatively homogenous Oe horizon over relatively unweathered basalt bedrock. The parent material for organic soils is biologic rather than geologic in origin with parent vegetation growing in crevices supplying the necessary organic debris. Soil acidity is directly influenced by the type of vegetation growing in the soil, with more acidic leaf litter creating lower pH soils while more alkaline plant debris generates soil with more neutral pH. Within these shallow soils (12–35 cm), organic C content (mean 333 g kg–1) is proportional to fiber content and cation-exchange capacity (CEC) and inversely proportional to bulk density. Compared with Folists of wetter climates, those forming at CROM have substantially higher bulk densities with a mean of 0.41 g cm–3. The influence of loessial mineral material likely accounts for the increased mineral content and subsequent increase in bulk density. Knowledge of the morphological, physical, and chemical properties of Folists at CROM is essential to improve our understanding of the ecological significance of Folists and co-evolution of soils and plant communities in a cool, arid environment.
机译:全新世的玄武岩熔岩流为研究土壤形成的初始阶段提供了独特的机会 。在爱达荷州南部的月球环形山国家纪念碑和自然保护区(CROM)的凉爽, 干燥气候中,有机土壤(土壤分类中的溶质) 是最近熔岩表面的主要土壤。不饱和的组织溶胶, 或Folists(世界参考库[WRB]中的叶状组织溶胶), 熔岩表面上的缝隙和洼地以及支持植被的 在这样恶劣的环境中生活这些 土壤由 血半(Oe层)上的稀薄纤维(Oi层)或单一的,相对同质的Oe层 上的土组成。相对未风化的玄武岩基岩。有机土壤的母体 在起源上是生物而不是地质 ,母体植被生长在缝隙中,提供必要的 有机碎片。土壤的酸度直接受土壤中植被类型的影响,酸性更高的凋落物产生的pH值较低的土壤,而碱性植物碎屑产生的pH值更高。 > pH值更中性的土壤。在这些浅层土壤(12–35 cm)中,有机碳含量(平均333 g kg –1 )与纤维含量和阳离子成正比。交换容量(CEC)和 与堆积密度成反比。与湿润的 气候的Folists相比,CROM上形成的那些具有显着更高的堆积 密度,平均密度为0.41 g cm –3 黄土矿物材料的影响可能解释了 矿物质含量的增加以及随后堆积密度的增加。在CROM上了解Folists 的形态,物理和化学性质的知识 对于增进我们对Folists的生态学意义和共同意义的理解至关重要。在凉爽,干旱的环境中土壤和植物 社区的演变。

著录项

  • 来源
    《Soil Science Society of America Journal》 |2009年第5期|1510-1518|共9页
  • 作者单位

    USDA, Natural Resources Conservation Service, 245 Jimmy Doolittle Rd., Salt Lake City, UT 84116,Dep. Plant, Soil, and Entomological Sciences, Univ. of Idaho, Rm. 242 Ag. Science, Moscow, ID 83844-2339;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号