Direct evidence and mechanism for biocrusts-induced improvements in pore structure of dryland soil and the hydrological implications
文献类型：期刊论文
| 作者 | Sun, Fuhai2,3; Xiao, Bo1,2,3,4; Li, Shenglong3; Yu, Xingxing1; Kidron, Giora J.6; Heitman, Joshua5 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2023-08-01 |
| 卷号 | 623页码:16 |
| ISSN号 | 0022-1694 |
| 关键词 | Biological soil crust Porosity Soil pore characteristics Soil structure Pore network model Chinese Loess Plateau |
| DOI | 10.1016/j.jhydrol.2023.129846 |
| 通讯作者 | Xiao, Bo(xiaobo@cau.edu.cn) |
| 英文摘要 | As a crucial living skin inhabiting the soil-atmosphere interface, biocrusts play a vital role in various soil properties and processes, especially surface soil pore structure and soil pore-related hydrological processes, such as infiltration and evaporation. However, it remains unclear how biocrusts affect pore structure in the micrometric point of view. In this study, X-ray computed tomography and image analysis were employed to quantify the differences in soil pore structure between bare soil and three types of biocrusts (cyanobacterial, cyanobacterial-moss mixed, and moss crusts) at 0-50 mm depth. Three-dimensional images were segmented and analyzed to assess morphological and geometrical properties, such as porosity, pore volume, degree of anisotropy, Euler number, pore shape, pore connectivity, and pore tortuosity. Our results showed that the porosity of three types of biocrusts was, on average, 100% higher than bare soil, and the porosity ranked in order of moss crusts > mixed crusts > cyanobacterial crusts > bare soil. In comparison to bare soil, pore surface area density, mean pore volume, and node density of biocrusts were increased by 45%, 422%, and 52% on average, respectively. Biocrusts had larger fractal dimensions but lower degrees of anisotropy, mean tortuosity, and Euler number, which indicates the pore structure of biocrust became more complex and stable with higher connectivity compared to bare soil. Additionally, elongated pores had the largest contribution to porosity, and these pore proportions were significantly higher in biocrusts than bare soil. More importantly, the pore network model and network analysis revealed that biocrusts have a higher connected porosity (17% vs. 4%), connected porosity/ isolated porosity (11.7 vs. 0.6), average coordination number (8 vs. 5), and number of channels (14,480 vs. 807), but a lower average channel length (2.7 vs. 3.8 mm), which indicates that the physical and topological structures of pore network in biocrusts were reconfigured and exhibited a better pore network connectivity. Moreover, the biocrusts increased soil water holding capacity by 87% on average, but decreased saturated hydraulic conductivity by 55% as compared to bare soil. From the reshaped pore structure, improved soil water holding capacity, and decreased infiltrability of the biocrusts in comparison to bare soil, we conclude that biocrusts play a vital role in surface soil water balance, which subsequently affect surface hydrological processes (e.g., runoff generation and evaporation) in drylands. |
| WOS关键词 | MOSS-DOMINATED BIOCRUSTS ; RAY COMPUTED-TOMOGRAPHY ; GURBANTUNGGUT DESERT ; WATER-FLOW ; CRUSTS ; SURFACE ; SAND ; MICROSTRUCTURE ; MACROPORES ; TRANSPORT |
| 资助项目 | National Natural Science Foundation of China[42077010] ; Light of West China Program of the Chinese Academy of Sciences[2019] ; Open Fund for Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China of Ningxia University[LDER2022Z02] |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001038732100001 |
| 资助机构 | National Natural Science Foundation of China ; Light of West China Program of the Chinese Academy of Sciences ; Open Fund for Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China of Ningxia University |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/195855]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Xiao, Bo |
| 作者单位 | 1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Shaanxi, Peoples R China 2.Ningxia Univ, Breeding Base State Key Lab Land Degradat & Ecol R, Key Lab Restorat & Reconstruct Degraded Ecosyst No, Minist Educ, Yinchuan 750021, Peoples R China 3.China Agr Univ, Coll Land Sci & Technol, Key Lab Arable Land Conservat North China, Minist Agr & Rural Affairs, Beijing 100193, Peoples R China 4.China Agr Univ, Coll Land Sci & Technol, Key Lab Arable Land Conservat North China, Minist Agr & Rural Affairs, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China 5.North Carolina State Univ, Dept Crop & Soil Sci, Raleigh, NC 27695 USA 6.Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel |
| 推荐引用方式 GB/T 7714 | Sun, Fuhai,Xiao, Bo,Li, Shenglong,et al. Direct evidence and mechanism for biocrusts-induced improvements in pore structure of dryland soil and the hydrological implications[J]. JOURNAL OF HYDROLOGY,2023,623:16. |
| APA | Sun, Fuhai,Xiao, Bo,Li, Shenglong,Yu, Xingxing,Kidron, Giora J.,&Heitman, Joshua.(2023).Direct evidence and mechanism for biocrusts-induced improvements in pore structure of dryland soil and the hydrological implications.JOURNAL OF HYDROLOGY,623,16. |
| MLA | Sun, Fuhai,et al."Direct evidence and mechanism for biocrusts-induced improvements in pore structure of dryland soil and the hydrological implications".JOURNAL OF HYDROLOGY 623(2023):16. |
入库方式： OAI收割
来源：地理科学与资源研究所
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