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广西高校作物栽培与生理重点实验室/广西农业环境与农产品安全重点实验室/广西大学农学院,南宁 530004
Received:07 November 2024,
Published:05 July 2025
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袁鹏丽,覃佳宇,周雨茜,等.旱改水型耕地红壤团聚体稳定性及影响因素研究[J].华中农业大学学报,2025,44(4):47‐57.
YUAN Pengli,QIN Jiayu,ZHOU Yuxi,et al.Stability and affecting factors of red soil agglomerates in dryland converted paddy fields[J].Journal of Huazhong Agricultural University,2025,44(04):47-57.
袁鹏丽,覃佳宇,周雨茜,等.旱改水型耕地红壤团聚体稳定性及影响因素研究[J].华中农业大学学报,2025,44(4):47‐57. DOI: 10.13300/j.cnki.hnlkxb.2025.04.005.
YUAN Pengli,QIN Jiayu,ZHOU Yuxi,et al.Stability and affecting factors of red soil agglomerates in dryland converted paddy fields[J].Journal of Huazhong Agricultural University,2025,44(04):47-57. DOI: 10.13300/j.cnki.hnlkxb.2025.04.005.
为探究南方红壤地区旱地改水田(旱改水)对土壤团聚体稳定性的影响,在广西典型旱改水地区选取传统旱地(HS0)、旱改水1 a稻田(HS1)、旱改水5 a稻田(HS5)和当地传统稻田(CK),采用干筛法和湿筛法对比分析耕层土壤团聚体性状。结果显示:传统旱地和实施旱改水后,HS0、HS1、HS5和CK处理下机械团聚体和水稳团聚体中
>
0.25 mm土壤团聚体含量(
R
>0.25
)分别为90.0%、94.0%、95.8%、98.1%和81.0%、70.6%、76.0%、95.4%;平均质量直径(mean weight diameter,
Φ
MWD
)分别为3.35、3.63、3.69、4.73 mm和2.25、0.94、1.54、4.63 mm。与HS0相比较,HS1处理的水稳团聚体中几何平均直径(geometric mean diameter,
Φ
GMD
)降低了68%。与HS0相比较,
>
0.25 mm团聚体的破坏率(percentage of aggregate destruction,
r
PAD
)随旱改水年限先增长后减小,HS1和HS5分别增加61%和34%,而CK显著降低76%。结构方程模型和随机森林分析结果表明,土壤阳离子交换量和全氮含量是影响旱改水农田耕层土壤团聚
体稳定的重要因素。
The traditional dryland (HS0), dryland converted paddy field in 1 year (HS1), dryland converted paddy field in 5 year (HS5) and local traditional paddy field (CK) in typical dryland-to-paddy area of Guangxi Zhuang Autonomous Region were selected to study the effects of dryland converted paddy field (dryland-to-paddy) on soil aggregates in southern red soil areas. Methods including dry screening and wet screening were used to compare and analyze the properties of soil aggregates in the tillage layer. The results showed that the content of soil aggregates
>
0.25 mm (
R
>
0.25
) in mechanical aggregates and water-stable aggregates in HS0, HS1, HS5 and CK was 90.0%, 94.0%, 95.8%, 98.1% and 81.0%, 70.6%, 76.0% and 95.4% in the traditional arid land and after dryland-to-paddy, with the mean weight diameter (
Φ
MWD
) of 3.35 mm, 3.63 mm, 3.69 mm, 4.73 mm and 2.25 mm, 0.94 mm, 1.54 mm, 4.63 mm, respectively. The geometric mean diameter (
Φ
GMD
) of the water-stable aggregates in HS1 decreased by 68% compared with that in HS0. The percentage of aggregate destruction (
r
PAD
) of
>
0.25 mm aggregate increased first and then decreased with the years of dryland-to-paddy compared with that in HS0, with the increase in HS1 and HS5 by 61% and 34%, while there was a significant decrease of 76% in CK. The results of structural equation model and random forest analyses indicated that the cation exchange capacity (CEC) and the content of total nitrogen (TN) in soil were the important factors affecting the stability of soil aggregates in the tillage layer of dryland converted paddy fields.
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