Insights about biocrust effects on soil gas transport and aeration in drylands: Permeability, diffusivity, and their connection to hydraulic conductivity
文献类型：期刊论文
| 作者 | Sun, Fuhai2; Xiao, Bo1,5,6; Kidron, Giora J.3; Heitman, Joshua L.4 |
| 刊名 | GEODERMA
 |
| 出版日期 | 2022-12-01 |
| 卷号 | 427页码:15 |
| ISSN号 | 0016-7061 |
| 关键词 | Biological soil crust Soil gas transport Air -filled porosity Pore characteristics Soil water infiltrability Chinese Loess Plateau |
| DOI | 10.1016/j.geoderma.2022.116137 |
| 通讯作者 | Xiao, Bo(xiaobo@cau.edu.cn) |
| 英文摘要 | Soil gas transport properties and aeration are essential influencing factors of soil chemical and biochemical reactions, especially the respiration processes of plant roots and microorganisms. As ecosystem engineers in drylands, biocrusts may greatly alter surface soil gas transport properties and aeration, but their influences remain unclear and understudied. In a semiarid dryland ecosystem on the Chinese Loess Plateau, the air permeability of bare soil and three types of biocrusts (cyanobacterial, cyanobacterial-moss mixed, and moss crusts) were measured in-situ with naturally changing soil water content. Undisturbed soil samples were also taken for each treatment, and their air permeability and relative gas diffusivity at air-dried and near-saturated conditions, as well as saturated hydraulic conductivity, were determined in the laboratory. We further analyzed the relationship between saturated hydraulic conductivity and air permeability or relative gas diffusivity and calculated the gas and permeability continuity (specific air permeability and specific gas diffusivity) and tortuosity indexes at air-dry and near-saturation. Our results showed that biocrusts were associated with a significantly higher air permeability in contrast to bare soil, and the in situ mean air permeability ranked in order of moss crusts > mixed crusts > cyanobacterial crusts > bare soil. At air-dried condition, biocrusts increased surface soil air permeability by 26% and relative gas diffusivity by 46% as compared with bare soil through decreased surface soil bulk density. In contrast, at near saturation biocrusts decreased air permeability and relative gas diffusivity by 33% and 20%, respectively, which was attributed to pore-clogging by extracellular polymeric substances of biocrusts (3.37 vs. 2.27 mg g(-1)). Accordingly, at air-dried condition biocrusts increased specific air permeability by 11% and specific gas diffusivity by 30% but decreased tortuosity by 7%. In contrast, they decreased specific air permeability by 76% and specific gas diffusivity by 39% but increased tortuosity by 28% at near-saturated condition. Additionally, the saturated hydraulic conductivity of cyanobacterial, cyanobacterial-moss mixed, and moss crusts were respectively 77%, 69%, and 61% lower than that of bare soil. We found that the relationship between saturated hydraulic conductivity and air permeability or relative gas diffusivity of biocrusts at air-dried condition can be well fitted with a positive linear log-log model (R2 > 0.95). In general, the improved gas transport properties of surface soil caused by different types of biocrusts leads to better soil aeration, which in turn would facilitate microbial activity, soil respiration, and root growth; and impact surface soil water vapor movement induced by evaporation or condensation processes in drylands. Therefore, biocrusts should be carefully considered in further assessments of global dryland hydrology and carbon or nitrogen cycling under changing climate. |
| WOS关键词 | MOSS-DOMINATED BIOCRUSTS ; WESTERN NEGEV DESERT ; AIR PERMEABILITY ; LOESS PLATEAU ; PORE CHARACTERISTICS ; GASEOUS-DIFFUSION ; POROUS-MEDIA ; CRUSTS ; CHINA ; FIELD |
| 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 North-western China of Ningxia University[LDER2022Z02] |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000862680600003 |
| 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 North-western China of Ningxia University |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/185661]  |
| 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.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 2.China Agr Univ, Coll Land Sci & Technol, Key Lab Arable Land Conservat North China, Minist Agr & Rural Affairs, Beijing 100193, Peoples R China 3.Hebrew Univ Jerusalem, Inst Earth Sci, IL-91904 Jerusalem, Givat Ram Campu, Israel 4.North Carolina State Univ, Dept Crop & Soil Sci, Raleigh, NC 27695 USA 5.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China 6.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 |
| 推荐引用方式 GB/T 7714 | Sun, Fuhai,Xiao, Bo,Kidron, Giora J.,et al. Insights about biocrust effects on soil gas transport and aeration in drylands: Permeability, diffusivity, and their connection to hydraulic conductivity[J]. GEODERMA,2022,427:15. |
| APA | Sun, Fuhai,Xiao, Bo,Kidron, Giora J.,&Heitman, Joshua L..(2022).Insights about biocrust effects on soil gas transport and aeration in drylands: Permeability, diffusivity, and their connection to hydraulic conductivity.GEODERMA,427,15. |
| MLA | Sun, Fuhai,et al."Insights about biocrust effects on soil gas transport and aeration in drylands: Permeability, diffusivity, and their connection to hydraulic conductivity".GEODERMA 427(2022):15. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。