Fractal scaling of particle size distribution and relationships with topsoil properties affected by biological soil crusts.
Fractal scaling of particle size distribution and relationships with topsoil properties affected by biological soil crusts.
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DOI：
10.1371/journal.pone.0088559
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Deng JF
中科院分区：
文献类型：
--
作者：
Gao GL;Ding GD;Wu B;Zhang YQ;Qin SG;Zhao YY;Bao YF;Liu YD;Wan L;Deng JF
生物土壤结皮是荒漠生态系统的常见组成部分，它覆盖地表并与表土相互作用，对干旱半干旱地区荒漠化防治和退化土地恢复具有重要作用。为了区分生物土壤结皮影响的表土变化，我们比较了三种类型的演替生物土壤结皮（藻类，地衣，苔藓结皮），以及参考沙地毛乌素沙漠，中国北方的表土性质。并讨论了土壤颗粒分布分形维数与土壤性质的关系。结果表明，生物结皮对土壤物理结构有显著的正效应（P<0. 05），土壤有机碳和养分在生物结皮演替过程中呈上升趋势。分形维数在2.1477 ~ 2.3032之间，与土壤理化性质呈显著线性相关（R2 = 0.494 ~ 0.955，P<0.01）。 生物结皮对土壤肥力有重要的提高作用，并有利于固沙，但其过程比较缓慢。分形维数被证明是一个敏感和有用的指标，量化土壤性质的变化，另外意味着荒漠化。这项研究对于为今后制定关于荒漠化控制和评估以及干旱和半干旱地区退化生态系统恢复的最佳解决办法的政策奠定坚实的基础至关重要。
Biological soil crusts are common components of desert ecosystem; they cover ground surface and interact with topsoil that contribute to desertification control and degraded land restoration in arid and semiarid regions. To distinguish the changes in topsoil affected by biological soil crusts, we compared topsoil properties across three types of successional biological soil crusts (algae, lichens, and mosses crust), as well as the referenced sandland in the Mu Us Desert, Northern China. Relationships between fractal dimensions of soil particle size distribution and selected soil properties were discussed as well. The results indicated that biological soil crusts had significant positive effects on soil physical structure (P<0.05); and soil organic carbon and nutrients showed an upward trend across the successional stages of biological soil crusts. Fractal dimensions ranged from 2.1477 to 2.3032, and significantly linear correlated with selected soil properties (R2 = 0.494∼0.955, P<0.01). Biological soil crusts cause an important increase in soil fertility, and are beneficial to sand fixation, although the process is rather slow. Fractal dimension proves to be a sensitive and useful index for quantifying changes in soil properties that additionally implies desertification. This study will be essential to provide a firm basis for future policy-making on optimal solutions regarding desertification control and assessment, as well as degraded ecosystem restoration in arid and semiarid regions.
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影响因子：
4.8
作者：
Belnap, J;Welter, JR;Ludwig, JA
通讯作者：
Ludwig, JA
影响因子：
2.7
作者：
Burgheimer, J;Wilske, B;Kesselmeier, J
通讯作者：
Kesselmeier, J
影响因子：
3.2
作者：
Belnap, Jayne
通讯作者：
Belnap, Jayne
影响因子：
--
作者：
BRASHER, BR;FRANZMEIER, DP;DAVIDSON, SE
通讯作者：
DAVIDSON, SE
影响因子：
9.7
作者：
Billings, SA;Schaeffer, SM;Evans, RD
通讯作者：
Evans, RD