三峡库区消落带沉积物与土壤磷形态及分配特征研究

发布时间：2018-04-17 07:44

本文选题：三峡库区 + 消落带　；参考：《水土保持学报》2016年04期

【摘要】：应用沉积物中磷形态的标准测试程序(SMT)对三峡库区典型消落带表层新生沉积物及土壤中形态磷进行分级测定,并探讨形态磷之间及其与有效磷和样品理化性质(有机质和铁)之间的相关性。结果表明:消落带沉积物及土壤中总磷(TP)含量分别在435.1~970.0,152.8~1 022.7mg/kg之间,均值分别为(713.6±124.3),(547.5±169.7)mg/kg,沉积物中TP含量远高于土壤,显示了新生沉积物吸附磷的能力高于土壤。无机磷(IP)是沉积物及土壤中磷的主要形态,分别占TP的78.2%,74.2%;有机磷(OP)只占较小的比例。沉积物及土壤中钙磷(Ca—P)是IP的主要赋存形态,Ca—P/IP均值为73.6%,74.1%,而铁/铝磷(Fe/Al—P)占IP比重仅为26.4%,25.9%。沉积物及土壤中有效磷(Olsen—P)含量分别在4.43~45.50,2.88~41.84mg/kg之间,其中分别有29.6%,11.1%的样品超过土壤磷素淋失的Olsen—P临界突变点(25mg/kg)。回归分析表明,沉积物中Fe/Al—P和OP是Olsen—P的主要贡献者,而Ca—P对Olsen—P的贡献很小;土壤中仅Fe/Al—P对Olsen—P有较大贡献。相关分析表明,有机质与OP呈极显著正相关,说明有机质的输入可促进OP的累积;TP、Fe/Al—P、Ca—P与无定形态铁(Fe_o—Fe_p)、有机络合态铁(Fe_p)呈显著正相关,表明Fe_o—Fe_p和Fe_p可促进沉积物及土壤的固磷作用。
[Abstract]:In this paper, the standard test procedure of phosphorus form in sediments is used to measure the phosphorus forms in the surface sediments and soils of the typical zone of the three Gorges Reservoir area, and the phosphorus forms in the surface sediments and soils of the three Gorges Reservoir area are classified.The relationship between phosphorus forms and physical and chemical properties of available phosphorus and samples (organic matter and iron) was also discussed.The results showed that the contents of TP in sediment and soil were in the range of 435.1 ~ 970.0152.8 022.7mg/kg and the mean value was 713.6 卤124.3 卤169.7 mg / kg, respectively. The TP content in sediment was much higher than that in soil, which indicated that the ability of new sediment to adsorb phosphorus was higher than that of soil.Inorganic phosphorus (IPP) is the main form of phosphorus in sediment and soil, which accounts for 78.2% of TP and 74.2% of TP, while organic phosphorus (OPP) accounts for only a small proportion.Ca-P) is the main occurrence form of IP in sediment and soil. The average value of Ca-P / IP is 73.6 and 74.1, while iron / aluminophosphorus iron / aluminophosphorus iron / aluminophosphorus is only 26.4% 25.9% of IP.The contents of available phosphorus Olsen-Pin in sediment and soil were 4.43 ~ 45.50 ~ 2.88 ~ 41.84 mg / kg, respectively, and 29.6% ~ 11.1% of the samples exceeded 25 mg / kg ~ (-1) of Olsen-P critical mutation point of phosphorus leaching.Regression analysis showed that Fe/Al-P and op were the main contributors of Olsen-P, while Ca-P contributed little to Olsen-P, and only Fe/Al-P in soil contributed more to Olsen-P.Correlation analysis showed that the organic matter was positively correlated with op, indicating that the input of organic matter could promote the accumulation of TP / Al-PnCa-P in op, and there was a significant positive correlation between the input of organic matter and the amorphous Fe ~ (-) -Fe _ P _ P _ P, and the organic complexation of Fe ~ (2 +) -Fe ~ (-P).The results showed that Fe_o-Fe_p and Fe_p could promote phosphorus sequestration in sediment and soil.
【作者单位】：西南大学资源环境学院;重庆市农业资源与环境研究重点实验室;
【基金】：国家自然科学基金项目(41171198) 水体污染控制与治理科技重大专项(2012ZX07104-003)
【分类号】：X524;S153.61

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