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天山云杉倒木的持水特性

, PP. 248-255

Keywords: 天山云杉(Picea,schrenkiana,var.,tianschanica,倒木,持水量,持水率,吸水速率,天山山脉

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Abstract:

倒木在森林生态系统尤其是山地森林生态系统的水文功能和水土保育功能等方面具有重要的作用。为了解天山云杉(Piceaschrenkianavar.tianschanica)倒木的持水特性和其对天山林区水文功能的影响,沿天山山脉由西至东选取跨越9个经度的5个地区(昭苏、新源、呼图壁、天池和奇台)分别进行取样,运用浸泡模拟法测定天山云杉倒木的吸水过程和持水能力。结果表明①天山云杉倒木的吸水过程在5个地区随着浸泡时间的推移,其持水量、持水率和持水能力均随着腐解等级的升高而增加。在浸泡吸水过程中天山云杉倒木的持水量(Q)随着浸泡时间(t)的增加而增加,两者的关系可用Q=alnt+b来拟合。②浸泡过程中天山云杉倒木吸水速率(V)随着浸泡时间(t)的增加而呈下降的趋势,两者的关系可用V=ct-d来拟合。③天山云杉倒木持水能力(Q′)与腐解等级(x)的关系可用方程Q′=ex2+fx+g来拟合。天山林区5个地区的天山云杉倒木的持水特性存在明显的差异,该成果为进一步开展天山林区水文功能性研究奠定了基础。

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