腾格里沙漠半固定沙丘不同植被土壤粒径分形与养分特征OACHSSCD
Fractal and nutrient characteristics of soil particle size under different plants in semi fixed dunes of Tengger Desert
探究腾格里沙漠半固定沙丘不同植被下的土壤粒度差异性,能够为沙漠地区人工植被选育和生态修复提供重要的参考依据.选取腾格里沙漠半固定沙丘芦苇、沙拐枣、沙蒿和白刺 4 种植物为研究对象,运用分形维数和相关分析相结合的方法,对其不同部位(背风坡、坡顶和迎风坡)土壤粒径组成及养分含量特征进行分析.结果表明,半固定沙丘 4 种植被的土壤颗粒组成均以细砂和中砂为主,占土壤总含量的 52.97%—96.58%.土壤平均粒径大小依次为芦苇＞白刺＞沙拐枣＞沙蒿.土壤单重分形维数D大小表现为白刺(1.71)＞芦苇(1.58)＞沙拐枣(1.55)＞沙蒿(1.50),且背风坡土壤分形维数大于迎风坡.土壤多重分形参数信息维D1、关联维D2、信息维/容量维D1/D0由大到小为:白刺＞沙拐枣＞沙蒿＞芦苇,且D0＞D1＞D2,土壤颗粒分布存在明显非均匀性,而奇异谱函数的谱宽Δα和对称度Δf均为白刺最大、沙蒿最小.土壤养分含量、D、Δα、Δf同黏粒、粉粒含量呈极显著正相关关系,与砂粒含量呈极显著负相关性.综上,腾格里沙漠东南缘半固定沙地白刺灌丛相较其他三种植被其土壤颗粒的吸附和固定能力更强,对土壤养分状态的改良作用也更加明显,且在半固定沙丘背风坡的综合效果更强.
Exploring the differences in soil particle size under different plants in semi-fixed dunes of the Tengger Desert can provide important reference for the selection and breeding of artificial vegetation and ecological restoration in desert areas.In this paper,four plants of Phragmites australis,Calligonum mongolicum,Artemisia sphaerocephala and Nitraria tangutorum in Tengger Desert were selected.The fractal dimension and correlation analysis were used to analyze the soil particle size composition and nutrient content characteristics of different positions of the sand dune,covering the leeward slope of the sand dune,the top of the sand dune,and the windward slope of the sand dune.The results showed that the soil particle composition under the four kinds of vegetation in semi-fixed dunes was dominated by fine sand and medium sand,accounting for 52.97%—96.58%of the total soil content.The average soil particle size was Phragmites australis＞Nitraria tangutorum＞Calligonum mongolicum＞Artemisia sphaerocephala.The order of soil single fractal dimension D was Nitraria tangutorum(1.71)＞Phragmites australis(1.58)＞Calligonum mongolicum(1.55)＞Artemisia sphaerocephala(1.50),and the soil fractal dimension of leeward slope was larger than that of windward slope.The order of soil multifractal parameters information dimension D1,correlation dimension D2,information dimension/capacity dimension D1/D0 was:Nitraria tangutorum＞Calligonum mongolicum＞Artemisia ordosica＞Phragmites australis,and D0＞D1＞D2.The distribution of soil particles was significantly non-uniform,while the spectral width Δα and symmetry degree Δf of singular spectral function were the largest in Nitraria tangutorum and the smallest in Artemisia ordosica.Soil nutrient content,D,Δα and Δf were significantly positively correlated with the content of clay and silt,and significantly negatively correlated with sand.Compared with the other three types of vegetation,Nitraria tangutorum in the semi-fixed sandy area at the southeastern edge of the Tengger Desert had a stronger adsorption and immobilization capacity of soil particles,and a more substantial effect on the improvement of soil nutrient status,as well as a stronger comprehensive effect in the leeward slopes of the semi-fixed sand dunes.
董晓宇;赵龙飞;张嘉;朱俐晨;伊丽娜;高兴;马慧
内蒙古农业大学沙漠治理学院,呼和浩特 010018内蒙古农业大学沙漠治理学院,呼和浩特 010018内蒙古农业大学沙漠治理学院,呼和浩特 010018内蒙古农业大学沙漠治理学院,呼和浩特 010018阿拉善盟生态产业发展规划中心,阿拉善盟 750306内蒙古农业大学沙漠治理学院,呼和浩特 010018内蒙古自治区水利科学研究院,呼和浩特 010052
腾格里沙漠土壤粒径分形维数土壤养分
Tengger Desertsoil particle sizefractal dimensionsoil nutrients
《生态学报》 2026 (3)
1159-1170,12
内蒙古自治区科技创新重大示范工程"揭榜挂帅"项目(2024JBGS0021-4-2)内蒙古自治区自然科学基金项目(2024QN03062)
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