脱硫石膏对碱化土壤团聚体特征的影响

张峰举<sup>1; 2</sup>; 许 兴<sup>1*</sup>; 肖国举<sup>2</sup>

张峰举，许兴，肖国举.脱硫石膏对碱化土壤团聚体特征的影响[J].干旱地区农业研究,2013,31(6):108~114

脱硫石膏对碱化土壤团聚体特征的影响

Influence of flue gas desulphurization gypsum on characteristics of soil aggregates in sodic soil

DOI：10.7606/j.issn.1000-7601.2013.06.020

中文关键词: 碱化土壤脱硫石膏土壤团聚体有机无机复合体

英文关键词:sodic soil flue gas desulphurization gypsum soil aggregates organic-inorganic compound particles

基金项目:宁夏回族自治区科技兴农项目(2011023)；“十二五”国家科技支撑计划项目（2013BAC02B04）

作者	单位
张峰举^1,2，许兴^1*，肖国举²	（1.宁夏大学农学院, 宁夏银川 750021； 2.宁夏大学新技术应用研究开发中心，宁夏银川 750021）

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中文摘要:

为探明脱硫石膏对碱化土壤物理结构性质的影响，采用田间试验的方法，研究了不同脱硫石膏施用量对碱化土壤团聚数量、大小、稳定性及有机无机复合体组分的影响。结果表明，耕作层施用脱硫石膏4 a后，与CK相比，机械稳定性团聚体(DR0.25)含量提高22.69%～45.29%、水稳定性团聚体(WR0.25)数量提高126.59％～304.70%、团粒平均重量直径(MWD)值提高2.63%～10.46%，团粒几何平均直径(GMD)值提高7.98%～19.01%，且土壤团聚体破坏率(PAD)和不稳定团粒指数(ELT)和分形维数D值均随脱硫石膏用量增加而明显降低。同时，脱硫石膏的施用显著降低了水分散复合体（G₀）含量、提高了钠质分散复合体（G₁）含量。总之，脱硫石膏施用主要通过Ca2+直接参与土壤有机无机复合体的形成，而显著改良碱化土壤的团聚体组成与稳定性状。

英文摘要:

To investigate the influence of flue gas desulphurization gypsum（FGDG） on the physical properties of sodic soil, a field experiment was conducted to study the effects of the different dosage of FGDG on the aggregation and stability of soil aggregates. The results indicated that compared to the control, content of aggregates above 0.25 mm by dry and wet sieving (DR0.25 and WR0.25), aggregate mean mass diameter(MWD), and geometric mean diameter (GMD) in 0～20 cm sodic soil layer increased by the range of 2.69%～45.29%, 126.59～304.70%, 2.63%～10.46%, and 7.98%～19.01%, respectively, by adding FGDP. Meanwhile, DR0.25, MWD, and GMD increased significantly with the increasing FGDG rat e, and the fractal dimensions of FGDG treatment were significantly lower than the control in 0～20 cm soil layer. In 0～20 cm soil layer, the aggregate destruction (PAD) and unstable aggregate index (ELT) were significantly reduced as FGDG rate increased. In addition, concentration of Ca²⁺ bridges compound particles (G₁) was increased for amelioration with FGDG, which may be associated with the promotion effect of organic molecules (OM) attached to clay (Cl) a nd polyvalent cations (P) (Cl-P-OM). Futher, concentration of the water solubility composite particles (G₀) in all FGDG treatments was significantly lower than the control. It is concluded that the FGDG contributed to the formation of organic-inorganic compound particles, which significantly improved the content and stability of aggregates in sodic soil.

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