生態農業：土壤碳蓄存之預測模型優化及驗證【土壤環境科學系/鄒裕民特聘教授、劉雨庭特聘教授】
| 論文篇名 | 英文：Promotion of phosphate release from humic acid-iron hydroxide coprecipitates in the presence of citric acid 中文：檸檬酸存在下促進磷酸鹽從腐殖酸-鐵氫氧化物共沉澱物中的釋放 |
| 期刊名稱 | Environmental Research |
| 發表年份,卷數,起迄頁數 | 2024, 240, no.117517 |
| 作者 | Ahmed, M. M. M.; Chen Kai-Yue, Tsao, Fang-Yu, Hsieh, Yi-Cheng, Liu, Yu-Ting(劉雨庭)*; Tzou, Yu-Min(鄒裕民)* |
| DOI | 10.1016/j.envres.2023.117517 |
| 中文摘要 | 磷酸鹽（P）資源預計在一個世紀內將耗盡。因此，促進磷肥的平衡使用並理解含有三價鐵、有機酸以及三價鐵-有機分子顆粒的土壤中磷的動態至關重要。本研究調查了檸檬酸在腐殖酸-鐵氫氧化物共沉澱物（HAFHCP）上的吸附及檸檬酸和磷在不同C/Fe比的HAFHCP上互相影響的吸附情況。結果顯示，隨著HAFHCP中C/Fe比的增加，檸檬酸在HAFHCP上的最大吸附容量（MSC）減少。與磷在FH上的MSC相比，預先吸附檸檬酸的HAFHCP（記為C–P）上的磷吸附量減少了50％。然而，當磷預先吸附在HAFHCP上（記為P–C）時，檸檬酸僅能減少20％的磷吸附。結果表明，檸檬酸可能在HAFHCP的形成過程中增加磷的有效性，特別是在C–P系統中。儘管檸檬酸在P–C系統中最初抑制了磷在HAFHCP上的吸附，但隨著反應時間的延長，磷的吸附量增加。這些結果可能是由於檸檬酸溶解HAFHCP中的鐵而暴露出新的吸附位點，或者是由於磷與HAFHCP有機域之間形成了鐵橋。此外，隨著P的吸附，由於FH表面的電斥力增加，許多大的HAFHCP聚集體變得更小，從而促進了更多鐵的溶解。在P–C系統中，檸檬酸從HAFHCP中溶解出更多的鐵。通過整合這些創新且可持續的策略，可以優化磷的回收與再利用，從而減少對合成肥料的依賴並減輕環境影響。這一方法促進了磷資源的有效利用，改善了土壤肥力，並增強了農業系統和生態系統的整體韌性。 |
| 英文摘要 | Phosphate (P) resources are expected to be depleted within a century. Therefore, promoting balanced phos phorus fertilizer use and understanding phosphorus dynamics in soils containing iron (III), organic acids, and iron (III)-organic molecule particulates is crucial. This study investigated the sorption of citric acid onto humic acid-iron hydr(o)xide coprecipitate (HAFHCP) and the reciprocal effects of citric acid and P sorption on HAFHCP with different C/Fe ratios. The results showed that the maximum sorption capacity (MSC) of citric acid on HAFHCP decreased with increasing C/Fe ratios in the HAFHCP. The P sorption on HAFHCP pre-sorbed with citric acids (denoted as C–P) decreased by 50% compared with that of the MSC on FH. However, citric acids could only reduce P sorption by 20% when P was pre-sorbed on HAFHCP (denoted as P–C). The results suggested that upon the formation of HAFHCP, citric acids might increase P availability, especially in the C–P system. Although citric acids initially inhibited P sorption on HAFHCP in the P–C system, P sorption increased with prolonged reaction time. The exposures of new sorption sites upon dissolution of Fe from HAFHCP by citric acids or/and the for mations of Fe bridge between P and organic domains of HAFHCP might contribute to these results. Additionally, a number of large HAFHCP aggregates became smaller while sorbing P due to the increasing electric repulsion on the surfaces of FH, enabling the subsequent dissolutions of more Fe by citric acids from HAFHCP in the P–C system. By integrating these innovative and sustainable strategies, the recycling and reuse of P can be optimized, thereby minimizing the reliance on synthetic fertilizers and mitigating environmental impacts. This approach fosters the efficient utilization of phosphorus resources, improves soil fertility, and enhances the overall resil ience of agricultural systems and ecosystems. |
| 發表成果與本中心研究主題相關性 | 磷酸鹽肥料即將枯竭, 農民每年大量施用磷肥已導致大量的磷在土壤中累積, 本研究深入探討磷與有機及鐵沉澱物上的交互作用, 並了解磷或作物釋出的有機酸與這有機鐵共沉澱物反應時, 磷的釋出的難易程度, 若能有效地將這累積在土壤且對植物有效性低的磷釋出機制, 將有助於肥料減量並減少施用時所導致的碳排及排入多於肥料於河川導致優養化問題 |
