三峡澎溪河流域消落区与岸边土壤磷形态特征

发布时间：2019-03-22 10:22

【摘要】：选取了落干期澎溪河流域6个消落区点位,分析了消落区土壤磷形态分布特征,并探讨了各形态磷之间的相关性.结果表明,(1)采用SMT法测定了消落区土壤总磷、无机磷和有机磷含量,其总磷TP含量均值为575.29 mg·kg~(-1),有机磷OP含量均值为91.23 mg·kg~(-1).(2)采用Hedley法分析了消落区土壤磷的5种赋存形态,其中WA-Pi、PA-Pi、Fe/Al-Pi等3种易迁移的无机磷形态之和占可提取Pi的11.61%,且低于岸边土壤;WA-Po、PA-Po两种生物可利用性较高的有机磷形态含量之和占可提取Po的22.28%,而中活性有机磷Fe/Al-Po占可提取Po的66.30%,且消落区土壤各形态Po含量均低于岸边土壤,又以Fe/Al-Po含量差异最大.(3)消落区土壤TP与活性较强的WA-Pt、PA-Pt呈显著相关,表明消落区土壤活性磷含量主要受TP影响;各形态磷之间不具有显著相关性,表明不同形态磷的来源可能不同;消落区土壤Fe/Al-Pt与土壤有机质OM呈显著相关,表明土壤有机质的含量可能影响铁铝结合态磷含量.在淹水条件下,消落区土壤磷组分的释放对上覆水体的潜在影响不容忽视.
[Abstract]:The distribution characteristics of the soil phosphorus in the falling area were analyzed, and the correlation between the various forms of phosphorus was also discussed. The results showed that (1) The total phosphorus, inorganic phosphorus and organic phosphorus content of the soil in the fall area were determined by the SMT method, and the total phosphorus TP content was 575.29 mg 路 kg ~ (-1), and the average content of the organic phosphorus OP was 91.23 mg 路 kg ~ (-1). (2) The five occurrence forms of soil phosphorus in the region were analyzed by the Hedley method, among which, the sum of WA-Pi, PA-Pi, Fe/ Al-Pi and so on is 11.61% of the extractable Pi and lower than the shore soil; WA-Po, The higher organic phosphorus content of PA-Po accounts for 22.28% of the extractable Po, while the active organic phosphorus Fe/ Al-Po accounts for 66.30% of the extractable Po, and the content of each form Po of the soil in the falling area is lower than that of the shore soil, and the content of the Fe/ Al-Po is the largest. (3) There was a significant correlation between the soil TP and the activity of WA-Pt and PA-Pt in the soil-removing area, indicating that the content of the active phosphorus in the soil in the fall-down area was mainly affected by the TP; there was no significant correlation between the various forms of phosphorus, indicating that the source of different forms of phosphorus may be different; The content of Fe/ Al-Pt in the soil is significantly related to the soil organic matter (OM), indicating that the content of the organic matter in the soil may affect the content of the iron-aluminum-bound phosphorus. Under the condition of inundation, the potential influence of the release of the phosphorus component of the soil in the falling area on the overlying water body cannot be ignored.
【作者单位】：重庆大学城市建设与环境工程学院;中国科学院重庆绿色智能技术研究院;
【基金】：国家自然科学基金项目(41430750,51679226)
【分类号】：X53

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