摘要
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D_(1)、关联维D_(2)、信息维/容量维D_(1)/D_(0)由大到小为:白刺>沙拐枣>沙蒿>芦苇,且D_(0)>D_(1)>D_(2),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 D_(1),correlation dimension D_(2),information dimension/capacity dimension D_(1)/D_(0) was:Nitraria tangutorum>Calligonum mongolicum>Artemisia ordosica>Phragmites australis,and D_(0)>D_(1)>D_(2).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.
作者
董晓宇
赵龙飞
张嘉
朱俐晨
伊丽娜
高兴
马慧
DONG Xiaoyu;ZHAO Longfei;ZHANG Jia;ZHU Lichen;YI Lina;GAO Xing;MA Hui(College of Desert Control Science And Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China;Alashan League Ecological Industry Development Planning Center,Alashan League 750306,China;Inner Mongolia Autonomous Region Water Conservancy Science Research Institute,Hohhot 010052,China)
出处
《生态学报》
北大核心
2026年第3期1159-1170,共12页
Acta Ecologica Sinica
基金
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)。
关键词
腾格里沙漠
土壤粒径
分形维数
土壤养分
Tengger Desert
soil particle size
fractal dimension
soil nutrients
