| 引用本文: | 韩 笑,佘冬立,王洪德,等.滨海土壤团聚体分布和分形维数及其影响因子研究[J].灌溉排水学报,2021,(5):88-92. |
| HAN Xiao,SHE Dongli,WANG Hongde,et al.滨海土壤团聚体分布和分形维数及其影响因子研究[J].灌溉排水学报,2021,(5):88-92. |
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| 摘要: |
| 【目的】研究滨海土壤团聚结构及其分形特征，为合理利用滩涂土地资源提供理论依据。【方法】以江苏省东台市条子泥垦区为研究对象，利用湿筛法测定土壤水稳性团聚体组成，探究了垦区内荒地和水稻田土壤团聚体分形维数特征；利用因子分析法研究了各理化因子对滨海土壤团聚体分形维数的影响。【结果】与垦区荒地相比，种植水稻后土壤大团聚体量增加了4.21%，分形维数减小了0.03。土壤团聚体分形维数与较大粒径团聚体量显著负相关，而与较小粒径团聚体量显著正相关。土壤平均重量直径和几何平均直径均与分形维数显著负相关。土壤中Na+、Mg2+、Ca2+、K+、SAR（钠吸附比）、Cl-对研究区土壤团聚体分形维数贡献率较大，且与分形维数显著正相关。【结论】水稻种植能使滨海土壤中大团聚体量增加，分形维数降低，团聚结构有所改善；部分土壤理化性质（Na+、Mg2+、Ca2+、K+、SAR、Cl-）对土壤团聚体分形维数贡献率较大且与其显著正相关。 |
| 关键词: 滨海土壤；水稳性团聚体；分形维数；因子分析 |
| DOI：10.13522/j.cnki.ggps.2020376 |
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| Fractal Dimension of Coastal Soil Aggregates and Its Relationship with Physical and Chemical Soil Properties |
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HAN Xiao, SHE Dongli, WANG Hongde, ZHENG Yipeng
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College of Agricultural Sciences and Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| 【Objective and objective】Soil aggregate is a function unit commonly used to describe the impact of soil structure on soil fertility and quality. It is temporally dynamic, modulated by a myriad of biotic and abiotic factors such as wetting-drying cycles and root-induced activity. One method to characterize aggregate fraction is fractal dimension. This paper is to study the relationship between fractal dimension of aggregates and physical and chemical properties of coastal soil. 【Method】Intact soil samples were taken from natural uncultivated land and rice fields at the Tiaozini reclamation area in Dongtai city, Jiangsu province. The fractions of water-stable aggregates in each sample were determined using wet-sieving, and fractal dimension of the soil aggregates under different cultivations was calculated by box-counting method. To elucidate the genesis of soil aggregation, we analyzed the correlation between fractal dimension and physical and chemical properties of the soils.【Result】Compared with the natural uncultivated land, planting rice increased soil macroaggregates by 4.21% and reduced fractal dimension of its aggregates by 0.03. Fractal dimension of the aggregates was negatively correlated with fraction of large aggregates, and negatively correlated with fraction of small aggregates. The mean weight and geometric diameters of the aggregates were negatively correlated with the fractal dimension. Factor analysis and correlation analysis both showed that the contents of Na+, Mg2+, Ca2+, K+, SAR and Cl- in the soil were positively correlated with the fractal dimension at significant level.【Conclusion】Planting rice increased the fraction of large aggregates and reduced fractal dimension of the aggregates of coastal soil, thereby improving soil structure. Fractal dimension of the aggregates was affected by contents of Na+, Mg2+, Ca2+, K+, SAR and Cl- in the soil at significant level. |
| Key words: coastal soil; water-stable aggregates; fractal dimension; factor analysis |
