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Saline–Alkali Land Ecology and Soil Management
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Saline–Alkali Land Ecology and Soil Management

A special issue of Agriculture (ISSN 2077-0472). This special issue belongs to the section "Agricultural Soils".

Deadline for manuscript submissions: closed (30 November 2024) | Viewed by 4265

Special Issue Editors

Prof. Dr. Yanchao Bai

E-Mail Website
Guest Editor
College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
Interests: soil amendment; saline-alkali land; soil carbon storage; heavy metal; plant nutrition
Special Issues, Collections and Topics in MDPI journals
Dr. Chuanhui Gu

E-Mail Website
Guest Editor
Environmental Research Center, Duke Kunshan University, Kunshan 215316, China
Interests: soil amendment; saline-alkali land; soil carbon storage; carbon and nitrogen cycling; soil greenhouse gas emissions
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Haiying Lu

E-Mail Website
Guest Editor
College of Biology and the Environment, Nanjing Forestry University, Nanjing 210042, China
Interests: wetland ecological process and restoration; non-point source pollution; heavy metal; biochar
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Saline–alkali lands are valuable resources. Such soils are high in salinity and low in fertility, as indicated by the poor structure, extremely low organic matter content, low nutrient level, and lack of microbial diversity, making them unsuitable for cultivation. The keys to restoring saline–alkali soil to arable land are (1) reducing salinity and (2) increasing the soil organic matter content and, thus, soil fertility. The former determines whether the reclaimed saline–alkali soil can be used for crop production and the latter determines whether the crop production is sustainable.

This Special Issue will strive to identify and answer questions around how we can optimize saline–alkali land ecology and soil management toward crop advancement.

We welcome cutting-edge research focusing on saline–alkali land ecology, and the management, amendment, aggregates, and crop advancement of saline–alkali soils.

Review articles and technology reports are welcome.

Prof. Dr. Yanchao Bai
Dr. Chuanhui Gu
Prof. Dr. Haiying Lu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Agriculture is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • saline–alkali land
  • soil ecology
  • soil amendment
  • soil aggregates
  • soil amendment
  • crop advancement

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Published Papers (4 papers)

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Research

22 pages, 11526 KiB  
Article
Multi-Scenario Simulation of Optimal Landscape Pattern Configuration in Saline Soil Areas of Western Jilin Province, China
by Chunlei Ma, Wenjuan Wang, Xiaojie Li and Jianhua Ren
Agriculture 2024, 14(12), 2181; https://doi.org/10.3390/agriculture14122181 (registering DOI) - 29 Nov 2024
Viewed by 151
Abstract
The Songnen Plain is a significant region in China, known for its high grain production and concentrated distribution of soda saline land. It is also considered a priority area for cropland development in the country. However, the Songnen Plain is now facing prominent [...] Read more.
The Songnen Plain is a significant region in China, known for its high grain production and concentrated distribution of soda saline land. It is also considered a priority area for cropland development in the country. However, the Songnen Plain is now facing prominent issues such as soil salinization, soil erosion, and deteriorating cropland quality, which are exacerbated by climate change and intensified human activities. In order to address these challenges, it is crucial to adjust the quantitative structure and layout of different landscapes in a harmonious manner, aiming to achieve synergistic optimization, which is posed as the key scientific approach to guide comprehensive renovation policies, improve saline–alkaline land conditions, and promote sustainable agricultural development. In this study, four scenarios including natural development, priority food production (PFP), ecological security priority (ESP), and economic–ecological-balanced saline soil improvement were set up based on Nondominated Sorting Genetic Algorithm II (NSGA-II) and the Future Land Use Simulation (FLUS) model. The results demonstrated that the SSI scenario, which focused on economic–ecological equilibrium, displayed the most rational quantitative structure and spatial layout of landscape types, with total benefits surpassing those of the other scenarios. Notably, this scenario involved converting unused land into saline cropland and transforming saline cropland into normal cropland, thereby increasing the amount of high-quality cropland and potential cropland while enhancing the habitat quality of the region. Consequently, the conflict between food production and ecological environmental protection was effectively mitigated. Furthermore, the SSI scenario facilitated the establishment of a robust ecological security and protection barrier, offering valuable insights for land use planning and ecological security pattern construction in the Songnen Plain, particularly in salt-affected areas. Full article
(This article belongs to the Special Issue Saline–Alkali Land Ecology and Soil Management)
20 pages, 5896 KiB  
Article
A Comparative Study of Different Dimensionality Reduction Algorithms for Hyperspectral Prediction of Salt Information in Saline–Alkali Soils of Songnen Plain, China
by Kai Li, Haoyun Zhou, Jianhua Ren, Xiaozhen Liu and Zhuopeng Zhang
Agriculture 2024, 14(7), 1200; https://doi.org/10.3390/agriculture14071200 - 21 Jul 2024
Viewed by 1016
Abstract
Hyperspectral technology is widely recognized as an effective method for monitoring soil salinity. However, the traditional sieved samples often cannot reflect the true condition of the soil surface. In particular, there is a lack of research on the spectral response of cracked salt-affected [...] Read more.
Hyperspectral technology is widely recognized as an effective method for monitoring soil salinity. However, the traditional sieved samples often cannot reflect the true condition of the soil surface. In particular, there is a lack of research on the spectral response of cracked salt-affected soils despite the common occurrence of cohesive saline soil shrinkage and cracking during water evaporation. To address this research, a laboratory was designed to simulate the desiccation cracking progress of 57 soda saline–alkali soil samples with different salinity levels in the Songnen Plain of China. After completion of the drying process, spectroscopic analysis was conducted on the surface of all the cracked soil samples. Moreover, this study aimed to evaluate the predictive ability of multiple linear regression models (MLR) for four main salt parameters. The hyperspectral reflectance data was analyzed using three different band screening methods, namely random forest (RF), principal component analysis (PCA), and Pearson correlation analysis (R). The findings revealed a significant correlation between desiccation cracking and soil salinity, suggesting that salinity is the primary factor influencing surface cracking of saline–alkali soil in the Songnen Plain. The results of the modeling analysis also indicated that, regardless of the spectral dimensionality reduction method employed, salinity exhibited the highest prediction accuracy for soil salinity, followed by electrical conductivity (EC) and sodium (Na+), while the pH model exhibited the weakest predictive performance. In addition, the usage of RF for band selection has the best effect compared with PCA and Pearson methods, which allows salt information of soda saline–alkali soils in Songnen Plain to be predicted precisely. Full article
(This article belongs to the Special Issue Saline–Alkali Land Ecology and Soil Management)
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16 pages, 5914 KiB  
Article
Effects of Buried Straw Strips with Different Internal Structures on Water and Salt Distribution and Leaching Efficiency in Coastal Saline Soil
by Umidbek Masharifov, Zhenchang Wang, Qingxin Li, Yaosheng Wang, Minghao Tian, Xiaoman Qiang, Jinjing Liu, Yuexiong Wang, Yanwei Fan, Kexin Chen, Sheng Chen and Cheng Hong
Agriculture 2024, 14(7), 994; https://doi.org/10.3390/agriculture14070994 - 25 Jun 2024
Viewed by 1071
Abstract
Straw strip burial in saline soil is an effective method for tideland reclamation in China, but optimal forms of straw strips for regulating soil water and salinity remain unclear. An indoor soil column test investigated the water and salt distribution in soil treated [...] Read more.
Straw strip burial in saline soil is an effective method for tideland reclamation in China, but optimal forms of straw strips for regulating soil water and salinity remain unclear. An indoor soil column test investigated the water and salt distribution in soil treated with four different straw forms under freshwater irrigation. The treatments included no straw layer (CK), straw stalks arranged longitudinally (T5), horizontally (T25), longitudinally combined horizontally in layers (T25+2.5), and randomly (T2.5). The results showed that compared to CK, T25, T5, and T25+2.5 significantly reduced the infiltration rate of irrigation water, leading to prolonged infiltration times. Wetting front curves under T5, T25+2.5, and T25 exhibited similar inverted “V” shapes, while CK and T2.5 showed fluctuating parallel lines. Water retention in the soil was higher under straw strip treatments (T5, T25, T25+2.5) and straw layer treatment (T2.5) compared to CK after 24 h of the first irrigation. T5 demonstrated the most effective salt removal, surpassing other treatments, with a desalination rate of 97.71%. Additionally, T5 had the highest salt leaching efficiency (SLE) in the 0–20 cm soil layer, recommending it as the optimal form for managing saline soils in crop production due to its simplicity and higher SLE. We found that buried straw strips reduced soil water infiltration rate and wetting front propulsion speed, increased soil water content and enhanced salt leaching efficiency in the saline soil. Our findings provide a basis for developing strategies that improve soil quality and irrigation efficiency, mitigate the effects of salinity on crop production, and ensure food security for a rapidly growing global population. Full article
(This article belongs to the Special Issue Saline–Alkali Land Ecology and Soil Management)
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14 pages, 9696 KiB  
Article
Addition of Exogenous Organic Ameliorants Mediates Soil Bacteriome and Microbial Community Carbon Source Utilization Pattern in Coastal Saline–Alkaline Soil
by Binxian Gu, Tianyang Qin, Meihua Qiu, Jie Yu, Li Zhang and Yunlong Li
Agriculture 2024, 14(1), 44; https://doi.org/10.3390/agriculture14010044 - 26 Dec 2023
Viewed by 1322
Abstract
Knowledge regarding how abiotic and biotic environmental factors operate in soil microbiome reassembly remains rudimentary in coastal saline–alkaline soils amended by different organic ameliorants. In this study, field trials were conducted to investigate the impacts and underlying mechanisms of sewage sludge (S) and [...] Read more.
Knowledge regarding how abiotic and biotic environmental factors operate in soil microbiome reassembly remains rudimentary in coastal saline–alkaline soils amended by different organic ameliorants. In this study, field trials were conducted to investigate the impacts and underlying mechanisms of sewage sludge (S) and sludge-based vermicompost (V) at the application amounts of 0, 50, and 100 t ha−1 on soil physicochemical characteristics, carbon source utilization pattern, and bacteriome in coastal saline–alkaline soils. Results revealed that impacts of the organic ameliorants on soil’s physicochemical and microbial attributes were highly dependent upon the carbon types and amounts applied. Unsurprisingly, applying sewage sludge and vermicompost significantly alleviated environmental constraints, such as saline–alkaline stress and nutrient deficiency, with lower pH, salinity, and higher soil organic carbon content observed in organics-amended soils. Specifically, higher microbial substrate metabolic activity, but lower diversity was observed in saline–alkaline soils amended by organic ameliorants. In addition, reassembled bacteriomes harboring distinguishable core and unique community profiles were observed in reclaimed soils as compared to unamended saline–alkaline soil. Procrustes analysis showed that the soil microbial utilization pattern of carbon sources was significantly related to the alterations in their physicochemical property and bacterial core microbiome. Additionally, Redundancy Analysis (RDA) revealed that soil core bacteriome reassembly was dominated by the integrated impacts of soil salinity, successively followed by carbohydrates, amino acids, polymers, pH, soil organic carbon (SOC), and available nitrogen (AN). Overall, this study provides a comprehensive understanding of soil abiotic and biotic determinants in bacteriome assembly in coastal saline–alkaline soil remediation mediated by organic ameliorants. Full article
(This article belongs to the Special Issue Saline–Alkali Land Ecology and Soil Management)
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