生态环境学报 ›› 2026, Vol. 35 ›› Issue (5): 738-747.DOI: 10.16258/j.cnki.1674-5906.2026.05.007
秦敬恒1,2(
), 陈兵3, 雷育锟4, 杨阳2, 陈国俊2, 刘同旭2, 胡世文2,*(
), 王培1,*(
)
收稿日期:2025-09-28
修回日期:2026-01-19
接受日期:2026-01-20
出版日期:2026-05-18
发布日期:2026-05-08
通讯作者:
*E-mail: 作者简介:秦敬恒(1995年生),男,硕士研究生,研究方向为土壤铁矿物和有机碳耦合作用。E-mail: a18838981682@163.com
基金资助:
QIN Jingheng1,2(
), CHEN Bing3, LEI Yukun4, YANG Yang2, CHEN Guojun2, LIU Tongxu2, HU Shiwen2,*(
), WANG Pei1,*(
)
Received:2025-09-28
Revised:2026-01-19
Accepted:2026-01-20
Online:2026-05-18
Published:2026-05-08
摘要:
含磷铁矿物与铁还原菌之间的相互作用是影响稻田土壤铁和磷迁移性和生物有效性的关键过程,然而,关于含磷铁矿物与铁还原菌互作对稻田土壤中铁和磷的迁移转运机制尚不清楚。选取典型水稻土开展盆栽试验,设置磷酸铁和异化铁还原菌(Shewanella oneidensis MR-1)的添加实验:对照组(CK)、低水平磷酸铁添加(FeP1)、高水平磷酸铁添加(FeP2)、低水平磷酸铁+MR-1添加(FeP1+MR-1)和高水平磷酸铁+MR-1(FeP2+MR-1)添加。在水稻生育期内,测定土壤孔隙水和植株中铁磷质量分数及植株和籽粒单株生物量变化,以此探究添加磷酸铁与异化铁还原菌对土壤-水稻体系中铁和磷迁移与转运的影响。结果表明,在淹水末期,与CK相比,FeP1、FeP1+MR-1和FeP2+MR-1处理的盐酸提取态Fe(II)质量分数分别高25.0 %、45.7 %、23.6 %;在磷酸铁+MR-1添加组中,孔隙水Fe(II)与盐酸提取态Fe(II)质量分数高于CK以及只添加磷酸铁的处理,说明异化铁还原菌促进了磷酸铁的还原和铁的释放。成熟期时,根表铁膜中的Fe质量分数,FeP1、FeP2、FeP1+MR-1、FeP2+MR-1处理组分别比CK(69.3 g·kg−1)高出24.4%、17.8%、20.1%、28.9%;对于根表铁膜中的P质量分数,FeP1、FeP2、FeP1+MR-1、FeP2+MR-1处理分别比CK(3.95 g·kg−1)高出24.5%、31.2%、24.7%、36.4%。在磷酸铁+MR-1添加组中,根际磷的生物有效性和植株磷的积累显著提高,表现为根表铁膜、茎、叶和稻壳的磷质量分数增加。FeP1、FeP2、FeP1+MR-1和FeP2+MR-1 4个处理组的糙米单株生物量分别为20.2、21.1、21.6和22.4 g·plant−1,均显著高于CK(18.6 g·plant−1)。淹水-排水稻田中磷酸铁与铁还原菌在根际环境中的协同作用,可有效促进铁和磷在土壤-孔隙水-植株系统中的迁移和转运。
中图分类号:
秦敬恒, 陈兵, 雷育锟, 杨阳, 陈国俊, 刘同旭, 胡世文, 王培. 含磷铁矿物与铁还原菌互作对土壤-水稻体系铁和磷迁移与转运的影响机制[J]. 生态环境学报, 2026, 35(5): 738-747.
QIN Jingheng, CHEN Bing, LEI Yukun, YANG Yang, CHEN Guojun, LIU Tongxu, HU Shiwen, WANG Pei. Effects of the Interplay between Phosphorus-bearing Iron Minerals and Iron-Reducing Bacteria on Iron and Phosphorus Migration and Transportation in Soil-rice Systems[J]. Ecology and Environmental Sciences, 2026, 35(5): 738-747.
| 指标 | 测定值 |
|---|---|
| 土壤pH | 5.21 |
| 比表面积/(m2·g−1) | 9.33 |
| 阳离子交换量/(cmol·kg−1) | 12.5 |
| 有机碳质量分数/(g·kg−1) | 38.7 |
| 全铁质量分数/(g·kg−1) | 16.9 |
| 全锰质量分数/(g·kg−1) | 0.25 |
| 全磷质量分数/(g·kg−1) | 0.86 |
| 有效磷质量分数/(mg·kg−1) | 59.5 |
| 全钙质量分数/(g·kg−1) | 1.49 |
| 全镁质量分数/(g·kg−1) | 1.64 |
| 全氮质量分数/(g·kg−1) | 2.17 |
表1 供试土壤理化性质
Table 1 Physicochemical properties of the experimental soil
| 指标 | 测定值 |
|---|---|
| 土壤pH | 5.21 |
| 比表面积/(m2·g−1) | 9.33 |
| 阳离子交换量/(cmol·kg−1) | 12.5 |
| 有机碳质量分数/(g·kg−1) | 38.7 |
| 全铁质量分数/(g·kg−1) | 16.9 |
| 全锰质量分数/(g·kg−1) | 0.25 |
| 全磷质量分数/(g·kg−1) | 0.86 |
| 有效磷质量分数/(mg·kg−1) | 59.5 |
| 全钙质量分数/(g·kg−1) | 1.49 |
| 全镁质量分数/(g·kg−1) | 1.64 |
| 全氮质量分数/(g·kg−1) | 2.17 |
| 处理组名称 | 磷酸铁添加量 | S. oneidensis MR-1添加量 | 重复 |
|---|---|---|---|
| CK | 0 | 0 | 3 |
| FeP1 | 0.068 g·kg−1 | 0 | |
| FeP2 | 0.17 g·kg−1 | 0 | |
| FeP1+MR-1 | 0.068 g·kg−1 | 1×107 cells·mL−1 | |
| FeP2+MR-1 | 0.17 g·kg−1 | 1×107 cells·mL−1 |
表2 不同处理组设置
Table 2 Experimental treatments
| 处理组名称 | 磷酸铁添加量 | S. oneidensis MR-1添加量 | 重复 |
|---|---|---|---|
| CK | 0 | 0 | 3 |
| FeP1 | 0.068 g·kg−1 | 0 | |
| FeP2 | 0.17 g·kg−1 | 0 | |
| FeP1+MR-1 | 0.068 g·kg−1 | 1×107 cells·mL−1 | |
| FeP2+MR-1 | 0.17 g·kg−1 | 1×107 cells·mL−1 |
图1 水稻孔隙水Fe(II)质量浓度和盐酸提取态Fe(II)质量分数变化 样品量n=3;图内曲线上的不同小写字母表示各处理之间的显著差异性(p<0.05)。下同
Figure 1 Changes in concentration of Fe(II) in rice pore water and mass fraction of HCl-extractable Fe(II)
图2 水稻土壤第1、15、80和122天不同处理下P形态分级 样品量n=3;不同大写字母表示同一处理不同分级处理(p<0.05),不同小写字母表示相同分级处理不同处理(p<0.05)
Figure 2 Phosphorus fractions in paddy soil under different treatments at 1, 15, 80, and 122 d
图4 水稻成熟期不同处理中各组织器官P分布比例 重复样品数n=3,不同大写字母表示同一处理不同组织部位(p<0.05),不同小写字母表示相同组织器官不同处理(p<0.05)
Figure 4 Distribution proportions of phosphorus among different rice organs at maturity under different treatments
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