| 浑善达克沙地3种典型灌丛固沙能力的比较研究 |
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| 引用本文： | 董雪,郝玉光,辛智鸣,段瑞兵,张冉浩,马媛,刘芳.浑善达克沙地3种典型灌丛固沙能力的比较研究[J].林业科学研究,2020,33(1):76-83. |
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| 作者姓名： | 董雪 郝玉光 辛智鸣 段瑞兵 张冉浩 马媛 刘芳 |
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| 作者单位： | 中国林业科学研究院沙漠林业实验中心,内蒙古磴口015200 |
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| 基金项目： | “十三五”国家重点研发计划(2016YFC0500904)。 |
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| 摘 要： | 目的]研究荒漠草原区出现灌丛化现象后,灌丛沙堆在退化生态系统中发挥的保育功能和防风固沙作用。方法]该研究以浑善达克沙地3种典型荒漠草原灌丛长柄扁桃(Amygdaluspedunculatd)、小叶锦鸡儿(Caragana microphylla)和狭叶锦鸡儿(Caragana stenophylla)为研究对象,通过测定分析3种灌丛形态参数、沙堆形态参数和灌丛下土壤颗粒分形维数,探讨其沙堆形态发育和土壤颗粒组成特征,以及与植物灌丛形态特性和固沙能力的关系。结果]表明:3种典型灌丛沙堆均为圆锥状,其沙堆高度随沙堆半径的增加呈对数曲线增加,即在沙堆形态较小时,随着沙堆半径的增大,沙堆高度增加较快,而随着沙堆底面积不断增大,沙堆高度变化就会趋于稳定且增加速度降低,整个沙堆在水平方向的延伸速度大于垂直方向;沙堆形态参数之间以及与灌丛形态参数间表现出显著相关性,随着灌丛地上生物量的增加,沙堆高度、半径、底面积和体积均呈显著增加(P<0.05), 3种灌丛沙堆体积和固沙率差异性显著(P<0.05),表现为:小叶锦鸡儿〉狭叶锦鸡儿〉长柄扁桃;灌丛使降尘等细粒物质拦截或聚集在灌丛下,土壤颗粒分形维数与粒径(<0.1mm)颗粒含量呈显著的线性正相关关系;不同物种灌丛下土壤分形维数差异性显著(P<0.05),表现为:小叶锦鸡儿(2.346)>狭叶锦鸡儿(2.259)>长柄扁桃(2.149)>裸沙地(2.057)。结论]灌丛越大,沙堆体积越大,灌丛下沉积细物质越多,土壤分形维数越大,植物固沙能力越强。
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| 关 键 词： | 草原灌丛化 固沙能力 土壤分形维数 形态特征 |
Comparative Study on Sand-fixing Capability of Three Typical Shrubs in Otindag Sandy Land |
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| DONG Xue,HAO Yu-guang,XIN Zhi-ming,DUAN Rui-bing,ZHANG Ran-hao,MA Yuan,LIU Fang.Comparative Study on Sand-fixing Capability of Three Typical Shrubs in Otindag Sandy Land[J].Forest Research,2020,33(1):76-83. |
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| Authors: | DONG Xue HAO Yu-guang XIN Zhi-ming DUAN Rui-bing ZHANG Ran-hao MA Yuan LIU Fang |
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| Institution: | (Experimental Center of Desert Forestry,Chinese Academy of Forestry,Dengkou,015200,Inner Mongolia,China) |
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| Abstract: | Objective]To study the conservation function of shrubby sand piles in the degraded ecosystem and the function of preventing wind and fixing sand in the ecological environment management of semi-arid desert steppe.Method]Amygdalus pedunculata Pall.Caragana microphylla Lam and Caragana stenophylla Pojark are three kinds of typical desert nabkhas distributed in Otindag sandy land.The shrub and nabkha morphological parameters of three kinds of brush and soil fractal dimension under the bushes were measured and analyzed to explore the relationship between morphological development and soil particle composition characteristics under the bushes and shrub morphological features and sand-fixation ability.Result]The results showed that the three kinds of typical shrubs were conical.Nabkha height increased in logarithmic curve line with the increase of nabkha radius.At the early stages the nabkha height grew fast with nabkhas radius increasing and then gradually turned to be stable when the bottom sand area increased.The speed of nabkha extension in horizontal direction was faster than that in vertical direction.There was a significant correlation between the morphological parameters of nabkha and shrub.With the increase of aboveground biomass,the height,radius,bottom area and volume of nabkhas significantly increased(PC.stenophylla(2.259)>A.pedunculata(2.149)>bare sandy(2.057).Conclusion]The larger the thickets is,the larger the volume of nabkha and the more the fine particles deposited under the brush.The bigger the soil fractal dimension is.the stronger the sand-fixing capacity of plants is. |
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| Keywords: | shrub encroachment sand-fixing capability soil fractal dimension morphology |
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