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中国沙漠  2015 

白梭梭(Haloxylonpersicum)灌丛下雾凇的散布格局及其对土壤含水量的影响

DOI: 10.7522/j.issn.1000-694X.2014.00071

Keywords: 雾凇,白梭梭(Haloxylonpersicum),空间异质性,土壤含水量,生物结皮,干旱区

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Abstract:

雾凇是古尔班通古特沙漠冬季常见的天气现象,荒漠植物具有较强的捕获雾凇的能力。雾凇作为隐匿性降水对荒漠植被的生长具有极其重要的作用。本研究调查了初冬无雪期2株不同大小的白梭梭(Haloxylonpersicum)灌丛下雾凇散落的分布格局,分析了雾凇对灌丛下土壤含水量的影响。结果表明:2株白梭梭灌丛下雾凇均表现出偏向下风坡散落的格局;雾凇量和土壤含水量的空间分布格局均服从高斯模型,并呈现出由灌丛基部向外先增加后减少的趋势;雾凇量与雾凇融化后土壤含水量的结构变异系数均在92%以上,表明二者的空间变异主要是灌丛引起的空间自相关造成的;2株白梭梭灌丛下的土壤含水量与雾凇散落量均为显著正相关,表明散落的雾凇确实增加了灌丛下的土壤含水量。因此,雾凇散落将有利于灌丛下生物结皮的生长,促进结皮(尤其是苔藓结皮)的选择性分布。

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