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Abstract：
The Mu Us Sandy Land is a region characterized by wind-blown sand and soil erosion in northern China. To enhance the soil quality of this area, various organic materials were incorporated into the mixed soil at a volume ratio of 1:2 for feldspathic sandstone to sand. Culture was conducted in the field and under constant temperature conditions in laboratory culture chambers. Four treatments were established in the experiment, each calculated based on weight ratio and controlled (with no organic material added, CK); single application of straw (5% straw, P1); single application of biochar (5% biochar, P2); combined application of biochar and straw (5% biochar + 5% straw, P3). After 90 days of culture, soil samples were collected for analysis of various indicators such as soil aggregate particle size distribution, water stability of soil aggregates, mean weight diameter, mean geometric diameter, and fractal dimension using dry sieving and wet sieving methods. The objective is to establish a scientific basis and provide technical support for addressing the challenges associated with compound soil and implementing rational fertilization measures. The research results indicate that: (1) The quantity of aggregates > 0.25 mm under different treatments follows the order CK < P1 < P2 < P3, and the differences between treatments are significant (P < 0.05); (2) Soil water stability, mean weight diameter (MWD), mean geometric diameter (GMD), and fractal dimension of soil aggregates in compound soil with different organic material additions are superior to the control, and the effect of biochar on improving soil aggregates is better than that of corn straw. The combined application of both significantly improves the effect compared to single applications. In both culture modes, under wet sieving, the P3 treatment shows the highest MWD and GMD of soil aggregates, with an increase ranging from 3.45% to 85% and 4.55% to 38.46%, respectively, compared to other treatments. (3) The trend of fractal dimension among treatments is consistent: P3 < P2 < P1 < CK, and the differences between treatments are significant (P < 0.05). Moreover, there is a good negative correlation linear equation relationship between the fractal dimension (y) and WR > 0.25 (x) of compound soil, with a correlation coefficient of up to 0.9851. In conclusion, the incorporation of organic materials can effectively enhance the proportion of macroaggregates in compound soil consisting of Feldspathic sandstone and sand, thereby improving soil stability and erosion resistance. The optimal outcome is achieved through the combined application of biochar and straw. Indoor culture proves to be more effective than field culture, while wet sieving accurately reflects the structural characteristics of compound soil under both dry and wet sieving treatments.
摘要：
毛乌素沙地是中国北方风沙和水土流失的地区。为了提高这个地区的土壤质量，长石砂岩与砂的体积比为1：2，将各种有机材料掺入混合土壤中。在现场和在实验室培养室中在恒温条件下进行培养。在实验中建立了四种处理方法，每个基于重量比计算并控制(不添加有机材料，CK)；单施秸秆(5%秸秆，P1)；单次施用生物炭(5%生物炭，P2)；生物炭和秸秆联合应用(5%生物炭+5%秸秆，P3)。经过90天的培养，收集土壤样品用于分析各种指标，如土壤团聚体粒径分布，土壤团聚体的水稳定性，平均重量直径，平均几何直径，和分形维数采用干筛和湿筛方法。目的是为解决与复合土壤相关的挑战和实施合理的施肥措施建立科学依据并提供技术支持。研究结果表明:(1)不同处理下大于0.25mm的团聚体数量遵循CK0.25(x)之间存在良好的负相关线性方程关系,相关系数高达0.9851。总之,有机材料的掺入可以有效提高长石砂岩和沙子组成的复合土壤中大团聚体的比例，从而提高土壤的稳定性和抗侵蚀性。通过生物炭和秸秆的联合应用达到了最佳效果。室内文化被证明比野外文化更有效，而湿筛准确地反映了干筛和湿筛处理下复合土壤的结构特征。
