植物根系诱导的土壤大孔隙驱动黄河三角洲垂向水文连通

doi:10.1093/jpe/rtae019

Journal of Plant Ecology ›› 2024, Vol. 17 ›› Issue (5): 1-12.DOI: 10.1093/jpe/rtae019

所属专题： SDGs 目标2: 零饥饿

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植物根系诱导的土壤大孔隙驱动黄河三角洲垂向水文连通

收稿日期:2024-01-03 接受日期:2024-03-14 出版日期:2024-10-01 发布日期:2024-07-10

Soil macropores induced by plant root as a driver for vertical hydrological connectivity in Yellow River Delta

Lumeng Xie^1,2, Jiakai Liu^1,2, Yi Li^1,2, Peisheng Huang³, Matt Hipsey³, Mingxiang Zhang^1,2 and Zhenming Zhang^1,2,*

¹School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China, ²The Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration, Beijing 100083, China, ³Centre for Water and Spatial Science, School of Agriculture and Environment, The University of Western Australia, Perth 6009, WA, Australia

^*Corresponding author. E-mail: zhenmingzhang@bjfu.edu.cn

Received:2024-01-03 Accepted:2024-03-14 Online:2024-10-01 Published:2024-07-10
Supported by:
This research was supported by the Young Scientists Fund of the National Natural Science Foundation of China (42307573) and Fundamental Research Funds for the Central Universities in China (BLX202250).

摘要/Abstract

摘要： 植物根系诱导的土壤大孔隙及其水文功能是揭示生态-水文相互作用的关键因素，也是区域生态保护和恢复的理论和实践基础，基于土壤水动力学的小尺度水文连通研究能够促进研究者对水文连通内涵的认知。本研究以黄河三角洲为例，基于X射线计算机断层扫描(CT)技术和恒定水头渗透实验，量化了不同植被群落土壤大孔隙特征及垂向水动力过程；利用Hydrus 1-D软件和Green–Ampt模型，估算了该地区均质土壤的垂向水动力特征；通过与入渗实验结果的比较，阐明了土壤大孔隙对土壤垂向水动力过程的影响，进一步揭示该地区的垂向水文连通性。结果表明，黄河三角洲地区土壤结构具有高度的空间异质性，土壤大孔隙体积数刺槐群落>碱蓬群落>柽柳群落，同时土壤大孔隙体积随土壤深度的增加而降低；土壤饱和导水率(Ks)与土壤容重(BD)呈负相关，与土壤大孔隙体积(V)、土壤通气量(SA)和最大持水量(MWC)呈正相关；土壤大孔隙体积能够显著提高土壤饱和导水率，促进水分快速运动。本研究所探讨的小尺度“植被-土壤-水文”协同作用机制，将为湿地垂向水文连通的恢复提供理论指导。

关键词: 土壤大孔隙, 土壤水动力, 水文连通, 湿地修复, 黄河三角洲

Abstract: The protection and management of the wetland should consider the changes in hydrological connectivity (HC) caused by the structural modifications of the soil macropores. The main purpose of our work is to clarify and quantify the influence of the soil macropores volume on the vertical soil hydrodynamic process mechanically and statistically by taking the form of a case study in Yellow River Delta (YRD), and further reveal the vertical hydrological connectivity in this area. Based on X-ray computed tomography and constant head permeability test, the results showed a highly spatial heterogeneity of the soil structure in the YRD, hydraulic parameter (K_s) was negatively correlated with bulk density and positively with soil macropore volume, soil aeration and maximum water capacity. Using Hydrus 1-D software and the Green–Ampt model, we estimated the characteristics of the hydrodynamic process in the soil without macropores, then evaluated the effect of the soil macropore on soil hydrodynamic process by comparing the experimental results with the simulation results. We found that increasing soil microporosity improved the convenience of water movement, which would enhance the HC of the region. The results will further help to reveal the eco-hydrological process at a vertical scale in soil and provide a theoretical guide for wetland conservation and restoration.

Key words: soil macropore, soil hydrodynamics, hydrological connectivity, wetland restoration, Yellow River Delta

. 植物根系诱导的土壤大孔隙驱动黄河三角洲垂向水文连通[J]. Journal of Plant Ecology, 2024, 17(5): 1-12.

Lumeng Xie, Jiakai Liu, Yi Li, Peisheng Huang, Matt Hipsey, Mingxiang Zhang, Zhenming Zhang. Soil macropores induced by plant root as a driver for vertical hydrological connectivity in Yellow River Delta[J]. J Plant Ecol, 2024, 17(5): 1-12.

[1]	. 湿地保护立法：全球进程与中国实践 [J]. Journal of Plant Ecology, 2024, 17(5): 1-11.
[2]	. [J]. Journal of Plant Ecology, 2020, 13(5): 525-537.

植物根系诱导的土壤大孔隙驱动黄河三角洲垂向水文连通

Soil macropores induced by plant root as a driver for vertical hydrological connectivity in Yellow River Delta

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