Phosphorus distribution and sorption-release characteristics of the soil from newly submerged areas in the Danjiangkou reservoir, China

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• 作者：Zhixin Song^a ; ^b ; Baoqing Shan^a ; ^b ; ^{bqshan@rcees.ac.cn} ; Wenzhong Tang^a ; ^b ; ^{wztang@rcees.ac.cn} ; Hong Zhang^a ; ^b ; Chao Wang^a ; ^b ; Yu Zhao^a ; ^b
• 关键词：Newly submerged area ; P ; Distribution ; Sorption-release
• 刊名：Ecological Engineering
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：99
• 期：Complete
• 页码：374-380
• 全文大小：1220 K
• 卷排序：99

文摘

The phosphorus (P) distribution and sorption-release characteristics of the surface soil in new submerged areas from the Danjiangkou Reservoir were investigated, and assessed the potential risk of P released from the soils. The results indicated that the TP (total phosphorus) contents in the soils varied from 161.01 mg/kg to 1150.94 mg/kg, and the mean content value of TP was the highest in arable land (732.91 mg/kg), especially distributed in arable land above 160 m elevation; Calcium bound phosphorus (HCl-P) was the major fraction of TP, the proportion was ranged from 60.77% to 83.38% for different land using types; the highest proportion of OP (organic phosphorus) was 32.07% in grass land soils. For all the samples, the rank order P-fractions was HCl-P > OP > NaOH-P (Phosphorus bound to Al and Fe oxides). Besides, the contents of TP correlated significantly with the HCl-P contents, (r = 0.936, P < 0.01), NaOH-P contents (r = 0.661, P < 0.01), OP contents (r = 0.762, P < 0.01), and IP contents (r = 0.970, P < 0.01), but OP contents was no significantly correlated with HCl-P, NaOH-P contents. The sorption capacity of soil ranged from 578.79 to 1457.44 mg/kg, and the amount of P released from the soils were ranged from 0.635 to 5.957 mg/kg; however, due to the concentration of P in the overlying water, about 80% of the newly submerged area would act as sink of P.