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Thomas A, Seaton F, Dhiedt E, Cosby BJ, Feeney C, Lebron I, Maskell L, Wood C, Reinsch S, Emmett BA, Robinson DA. Topsoil porosity prediction across habitats at large scales using environmental variables. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 922:171158. [PMID: 38387558 DOI: 10.1016/j.scitotenv.2024.171158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 02/19/2024] [Accepted: 02/19/2024] [Indexed: 02/24/2024]
Abstract
Soil porosity and its reciprocal bulk density are important environmental state variables that enable modelers to represent hydraulic function and carbon storage. Biotic effects and their 'dynamic' influence on such state variables remain largely unknown for larger scales and may result in important, yet poorly quantified environmental feedbacks. Existing representation of hydraulic function is often invariant to environmental change and may be poor in some systems, particularly non-arable soils. Here we assess predictors of total porosity across two comprehensive national topsoil (0-15 cm) data sets, covering the full range of soil organic matter (SOM) and habitats (n = 1385 & n = 2570), using generalized additive mixed models and machine learning. Novel aspects of this work include the testing of metrics on aggregate size and livestock density alongside a range of different particle size distribution metrics. We demonstrate that porosity trends in Great Britain are dominated by biotic metrics, soil carbon and land use. Incorporating these variables into porosity prediction improves performance, paving the way for new dynamic calculation of porosity using surrogate measures with remote sensing, which may help improve prediction in data sparse regions of the world. Moreover, dynamic calculation of porosity could support representation of feedbacks in environmental and Earth System Models. Representing the hydrological feedbacks from changes in structural porosity also requires data and models at appropriate spatial scales to capture conditions leading to near-saturated soil conditions. Classification. Environmental Sciences.
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Affiliation(s)
- A Thomas
- UK Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, UK.
| | - F Seaton
- UK Centre for Ecology and Hydrology, Library Ave, Bailrigg, Lancaster, UK
| | - E Dhiedt
- UK Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, UK
| | - B J Cosby
- UK Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, UK
| | - C Feeney
- UK Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, UK
| | - I Lebron
- UK Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, UK
| | - L Maskell
- UK Centre for Ecology and Hydrology, Library Ave, Bailrigg, Lancaster, UK
| | - C Wood
- UK Centre for Ecology and Hydrology, Library Ave, Bailrigg, Lancaster, UK
| | - S Reinsch
- UK Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, UK
| | - B A Emmett
- UK Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, UK
| | - D A Robinson
- UK Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, UK
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Zhang Y, Cao J, Lu M, Kardol P, Wang J, Fan G, Kong D. The origin of bi-dimensionality in plant root traits. Trends Ecol Evol 2024; 39:78-88. [PMID: 37777374 DOI: 10.1016/j.tree.2023.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 09/01/2023] [Accepted: 09/01/2023] [Indexed: 10/02/2023]
Abstract
Plant roots show extraordinary diversity in form and function in heterogeneous environments. Mounting evidence has shown global bi-dimensionality in root traits, the root economics spectrum (RES), and an orthogonal dimension describing mycorrhizal collaboration; however, the origin of the bi-dimensionality remains unresolved. Here, we propose that bi-dimensionality arises from the cylindrical geometry of roots, allometry between root cortex and stele, and independence between root cell wall thickness and cell number. Root geometry and mycorrhizal collaboration may both underlie the bi-dimensionality. Further, we emphasize why plant roots should be cylindrical rather than flat. Finally, we highlight the need to integrate organ-, cellular-, and molecular-level processes driving the bi-dimensionality in plant roots to fully understand plant diversity and functions.
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Affiliation(s)
- Yue Zhang
- College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
| | - Jingjing Cao
- College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
| | | | - Paul Kardol
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Umeå, 75007, Sweden; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, 90183, Sweden
| | - Junjian Wang
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Guoqiang Fan
- College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
| | - Deliang Kong
- College of Forestry, Henan Agricultural University, Zhengzhou 450002, China.
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Yang X, Zhang Z, Guo X. Impact of soil structure and texture on occurrence of microplastics in agricultural soils of karst areas. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 902:166189. [PMID: 37567305 DOI: 10.1016/j.scitotenv.2023.166189] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/07/2023] [Accepted: 08/08/2023] [Indexed: 08/13/2023]
Abstract
The impact of microplastics (MPs) on soil ecosystems has attracted widespread attention; however, the effects of soil structure and texture on the occurrence of MPs are not fully understood. In this study, we investigated the effects of soil structure and texture on the abundance of MPs and their potential mechanisms in agricultural soils of karst areas in Guizhou, China. The results showed the average abundance of MPs was 2948 items/kg. The soil texture in the study area can be categorized into seven types such as powdered-light clay, the range of total soil porosity was 39.05-69.22 % and the range of soil bulk density was 0.66-1.51 g/cm3. Soils with a powdered-light clay, low soil porosity, and low soil bulk density showed higher MPs pollution. The percentage of pellet MPs in agricultural soils with a powdered-light clay was 84 %, which was higher than that of the other soil textures. The direct effects of soil texture, soil porosity, and soil bulk density on MPs abundance were much lower than the indirect effects, with soil texture having the highest effect on MPs abundance. We speculated that karst geology may affect the accumulation and distribution of MPs in soil by affecting soil texture and structure, which, in turn, affects the fragmentation and migration of MPs. These findings will help to better understand the mechanisms of soil MPs pollution and provide a scientific basis for the development of relevant control strategies.
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Affiliation(s)
- Xiuyuan Yang
- College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, Guizhou, China
| | - Zhenming Zhang
- College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, Guizhou, China; Key Laboratory of Kast Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China; Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guiyang 550025, China.
| | - Xuetao Guo
- College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China.
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Robinson DA, Nemes A, Reinsch S, Radbourne A, Bentley L, Keith AM. Global meta-analysis of soil hydraulic properties on the same soils with differing land use. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 852:158506. [PMID: 36058328 DOI: 10.1016/j.scitotenv.2022.158506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 08/30/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
Global land use change has resulted in more pasture and cropland, largely at the expense of woodlands, over the last 300 years. How this change affects soil hydraulic function with regard to feedbacks to the hydrological cycle is unclear for earth system modelling (ESM). Pedotransfer functions (PTFs) used to predict soil hydraulic conductivity (K) take no account of land use. Here, we synthesize >800 measurements from around the globe from sites that measured near-saturated soil hydraulic conductivity, or infiltration, at the soil surface, on the same soil type at each location, but with differing land use, woodland (W), grassland (G) and cropland (C). We found that texture based PTFs predict K reasonably well for cropland giving unbiased results, but increasingly underestimate K in grassland and woodland. In native woodland and grassland differences in K can usually be accounted for by differences in bulk density. However, heavy grazing K responses can be much lower indicating compaction likely reduces connectivity. We show that the K response ratios (RR) between land uses vary with cropland (C/W = 0.45 [W/C = 2.2]) and grassland (G/W = 0.63 [W/G = 1.6]) having about half the K of woodland.
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Affiliation(s)
- David A Robinson
- UK Centre for Ecology & Hydrology, Environment Centre Wales, Bangor, United Kingdom.
| | - Attila Nemes
- Division of Environment and Natural Resources, Norwegian Institute of Bioeconomy Research, Ås, Norway; Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
| | - Sabine Reinsch
- UK Centre for Ecology & Hydrology, Environment Centre Wales, Bangor, United Kingdom
| | - Alan Radbourne
- UK Centre for Ecology & Hydrology, Environment Centre Wales, Bangor, United Kingdom
| | - Laura Bentley
- UK Centre for Ecology & Hydrology, Environment Centre Wales, Bangor, United Kingdom
| | - Aidan M Keith
- UK Centre for Ecology & Hydrology, Library Avenue, Bailrigg, Lancaster, United Kingdom
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Fulazzaky MA, Ismail I, Harlen H, Sukendi S, Roestamy M, Siregar YI. Evaluation of change in the peat soil properties affected by different fire severities. ENVIRONMENTAL MONITORING AND ASSESSMENT 2022; 194:783. [PMID: 36098855 DOI: 10.1007/s10661-022-10430-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
The tropical peatland ecosystems of Indonesia provide direct economic benefits to local communities and act to maintain local weather patterns. The impact of burning tropical peat swamp forests of land clearing for palm oil plantations can have significant consequences on the change in the characteristics of peat soil. The aim of this study was to determine the physical, chemical, and biological properties of peat soils by field and laboratory testing and analysis to understand changes in the nature and characteristics of peatlands at four locations in the Pelalawan Regency of Riau Province. The results showed that the effect of burning peat swamp forests can lead to a change in the physical, chemical, and biological properties of the peat soils. Soil permeability and the soil microbial population can significantly decrease with increasing fire severity. The effect of different fire severities on the characteristics of peat soil is verified to contribute to advanced management of the tropical peatland in the future.
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Affiliation(s)
- Mohamad Ali Fulazzaky
- School of Postgraduate Studies, Universitas Djuanda, Jalan Tol Ciawi No. 1, Ciawi, Bogor, 16720, Indonesia.
- School of Civil Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM, Skudai, Johor Bahru, Malaysia.
| | - Ibrahim Ismail
- Postgraduate School of Environmental Science, Universitas Riau, Jalan Pattimura No. 9, Gobah Pekanbaru 28125, Riau, Indonesia
| | - Harlen Harlen
- Faculty of Economics, Universitas Riau, Jalan Pattimura No. 9, Gobah, 28125, Riau, Indonesia
| | - Sukendi Sukendi
- Faculty of Economics, Universitas Riau, Jalan Pattimura No. 9, Gobah, 28125, Riau, Indonesia
| | - Martin Roestamy
- School of Postgraduate Studies, Universitas Djuanda, Jalan Tol Ciawi No. 1, Ciawi, Bogor, 16720, Indonesia
| | - Yusni Ikhwan Siregar
- Faculty of Fishery and Marine, Universitas Riau, Jalan Pattimura No. 9, Gobah, 28125, Riau, Indonesia
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