| 苔藓生物结皮层腐殖质组成变化特征研究 |
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| 引用本文： | 闫德仁,张胜男,吴振廷.苔藓生物结皮层腐殖质组成变化特征研究[J].干旱区地理,2019,42(6):1354-1358. |
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| 作者姓名： | 闫德仁 张胜男 吴振廷 |
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| 作者单位： | 内蒙古林业科学研究院,内蒙古呼和浩特,010010 |
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| 基金项目： | 国家自然科学基金项目资助（31560239） |
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| 摘 要： | 腐殖质组成是表征土壤化学性质的主要指标之一，在某种程度对评价风沙土的发育过程具有意义。采集了不同气候区沙地沙漠苔藓生物结皮层样品，采用重铬酸钾容量法和光密度法测定了苔藓结皮层腐殖质组成含量和胡敏酸吸光特性。结果表明：随着干燥指数的增加，苔藓结皮层有机质含量由14.93 g·kg-1降低到9.89 g·kg-1，腐殖酸总量由5.1 g·kg-1降低到2.0 g·kg-1，胡敏酸含量由2.9 g·kg-1降低到 0.7 g·kg-1，富里酸含量由2.2 g·kg-1降低到1.3 g·kg-1，胡敏酸与富里酸比值（HA/FA）由1.32降低到0.54，E4/E6比值则由4.28增加到5.83。苔藓结皮层腐殖质组成含量及胡敏酸吸光特性具有地带性变化趋势，并影响着生物结皮层及流动风沙土的发育演变过程。
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| 关 键 词： | 苔藓生物结皮 沙漠 有机质 腐殖质组成 地带性特征 |
| 收稿时间： | 2019-04-02 |
Characteristics
of humus composition in crusts of bryophytes |
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| YAN De-ren,ZHANG Sheng-nan,WU Zhen-ting.Characteristics
of humus composition in crusts of bryophytes[J].Arid Land Geography,2019,42(6):1354-1358. |
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| Authors: | YAN De-ren ZHANG Sheng-nan WU Zhen-ting |
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| Affiliation: | Inner Mongolia Academy of
Forestry Science,Hohhot 010010,Inner Mongolia,China |
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| Abstract: | Humus
composition is one of the basic characteristics of soil, which has important
guiding significance for the evaluation of soil formation and evolution
process. In this paper, the samples of bryophyte crust layers from sandy
deserts in different climatic regions of Inner Mongolia, China were collected. The
content of humus composition of bryophyte crust layers and the light absorption
properties of humic acid were determined by potassium dichromate volumetric
method and optical density method. The results showed that with the increase in
the dryness index, bryophyte crust organic matter content was reduced from 14.93
to 9.89 g·kg-1,total
humic acid content was reduced from 5.1 to 2.0 g·kg-1,humic
acid content was reduced from 2.9 to 0.7 g·kg-1,folic
acid content was reduced from 2.2 to 1.3 g·kg-1, HA/FA ratio was reduced from 1.32 to 0.45,and E4/E6 ratio was increased from 4.28 to 5.83.The content of humus in bryophyte crust
and the light absorption properties of humic acid have a zonal trend, and it
influences the development and evolution of biological crusts and aeolian sandy
soils. |
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| Keywords: | Times New Roman" serif bryophyte" target="_blank">">bryophyte crust layers desert organic matter humus composition zonality trend |
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