{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,16]],"date-time":"2026-05-16T18:23:51Z","timestamp":1778955831779,"version":"3.51.4"},"reference-count":46,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2024,1,24]],"date-time":"2024-01-24T00:00:00Z","timestamp":1706054400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The Second Tibetan Plateau Scientific Expedition and Research (STEP) program \u201cChanges in grassland ecosystem types, structure, productivity and driving factors in western Sichuan and northwest Yunnan\u201d","award":["2019QZKK0302-02"],"award-info":[{"award-number":["2019QZKK0302-02"]}]},{"name":"The Second Tibetan Plateau Scientific Expedition and Research (STEP) program \u201cChanges in grassland ecosystem types, structure, productivity and driving factors in western Sichuan and northwest Yunnan\u201d","award":["2022xjkk0402"],"award-info":[{"award-number":["2022xjkk0402"]}]},{"name":"The Second Tibetan Plateau Scientific Expedition and Research (STEP) program \u201cChanges in grassland ecosystem types, structure, productivity and driving factors in western Sichuan and northwest Yunnan\u201d","award":["2019QZKK0304-02"],"award-info":[{"award-number":["2019QZKK0304-02"]}]},{"name":"The Third Xinjiang Scientific Expedition Program","award":["2019QZKK0302-02"],"award-info":[{"award-number":["2019QZKK0302-02"]}]},{"name":"The Third Xinjiang Scientific Expedition Program","award":["2022xjkk0402"],"award-info":[{"award-number":["2022xjkk0402"]}]},{"name":"The Third Xinjiang Scientific Expedition Program","award":["2019QZKK0304-02"],"award-info":[{"award-number":["2019QZKK0304-02"]}]},{"name":"The Second Tibetan Plateau Scientific Expedition and Research (STEP) program \u201cWetland Ecosystem and Hydrological Process Change\u201d","award":["2019QZKK0302-02"],"award-info":[{"award-number":["2019QZKK0302-02"]}]},{"name":"The Second Tibetan Plateau Scientific Expedition and Research (STEP) program \u201cWetland Ecosystem and Hydrological Process Change\u201d","award":["2022xjkk0402"],"award-info":[{"award-number":["2022xjkk0402"]}]},{"name":"The Second Tibetan Plateau Scientific Expedition and Research (STEP) program \u201cWetland Ecosystem and Hydrological Process Change\u201d","award":["2019QZKK0304-02"],"award-info":[{"award-number":["2019QZKK0304-02"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The soil dielectric constant model is essential for retrieving soil properties based on microwave remote sensing. However, the existing saline soil dielectric constant models perform poorly in simulating the dielectric constant of soil with high water content and salinity. In this study, the Wang Yueru (WYR) saline soil dielectric constant model, which was demonstrated to perform well in describing the effect of salinity and moisture on the dielectric constant, was validated based on experimental measurements of soil samples under different water content and salinity degrees. Furthermore, we adjusted the model form, refitted the empirical coefficient in the model, and finally acquired a two-stage model for simulating the soil dielectric constant. The enhanced model was validated under different soil moisture and salinity ranges using experimental measurements of soil samples. Compared to the original model, the proposed model exhibits a larger improvement in simulating the soil dielectric constant, and the RMSE of the simulated results dramatically decreased from 7.3 to 1.6, especially for soil with high salinity and water content. On this basis, a model suitable for L-band microwave was established. This model is of great significance for studying soil dielectric characteristics and retrieving soil parameters based on L-band data. Furthermore, this model can be used to retrieve soil salinity and water content using microwave remote sensing under a broadened application situation, such as in saline-alkali soils, wetlands, and salt marshes.<\/jats:p>","DOI":"10.3390\/rs16030452","type":"journal-article","created":{"date-parts":[[2024,1,24]],"date-time":"2024-01-24T07:42:16Z","timestamp":1706082136000},"page":"452","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity Retrieval"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5524-2718","authenticated-orcid":false,"given":"Liang","family":"Gao","sequence":"first","affiliation":[{"name":"College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China"},{"name":"Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 101408, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaoning","family":"Song","sequence":"additional","affiliation":[{"name":"College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China"},{"name":"Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 101408, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaotao","family":"Li","sequence":"additional","affiliation":[{"name":"China Institute of Water Resources and Hydropower Research, Beijing 100038, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jianwei","family":"Ma","sequence":"additional","affiliation":[{"name":"China Institute of Water Resources and Hydropower Research, Beijing 100038, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pei","family":"Leng","sequence":"additional","affiliation":[{"name":"Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture and Rural Affairs, Beijing 100081, China"},{"name":"Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weizhen","family":"Wang","sequence":"additional","affiliation":[{"name":"Northwest Institute of Eco-Environment and Resources, Lanzhou 730000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xinming","family":"Zhu","sequence":"additional","affiliation":[{"name":"College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China"},{"name":"Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing 101408, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,1,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"236","DOI":"10.1016\/j.advwatres.2017.09.010","article-title":"Four decades of microwave satellite soil moisture observations: Part 2. Product validation and inter-satellite comparisons","volume":"109","author":"Karthikeyan","year":"2017","journal-title":"Adv. Water Resour."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"103673","DOI":"10.1016\/j.earscirev.2021.103673","article-title":"Soil moisture retrieval from remote sensing measurements: Current knowledge and directions for the future","volume":"218","author":"Li","year":"2021","journal-title":"Earth-Sci. Rev."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/bs.agron.2021.03.001","article-title":"Critical knowledge gaps and research priorities in global soil salinity","volume":"Volume 169","author":"Sparks","year":"2021","journal-title":"Advances in Agronomy"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"401","DOI":"10.1007\/s13593-015-0283-4","article-title":"Management of crop water under drought: A review","volume":"35","author":"Bodner","year":"2015","journal-title":"Agron. Sustain. Dev."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1016\/S0309-1708(02)00095-7","article-title":"Hydrologic controls on soil carbon and nitrogen cycles. II. A case study","volume":"26","author":"Laio","year":"2003","journal-title":"Adv. Water Resour."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"289","DOI":"10.1016\/j.rse.2019.02.008","article-title":"Assessment and inter-comparison of recently developed\/reprocessed microwave satellite soil moisture products using ISMN ground-based measurements","volume":"224","author":"Wigneron","year":"2019","journal-title":"Remote Sens. Environ."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"112052","DOI":"10.1016\/j.rse.2020.112052","article-title":"Global scale error assessments of soil moisture estimates from microwave-based active and passive satellites and land surface models over forest and mixed irrigated\/dryland agriculture regions","volume":"251","author":"Kim","year":"2020","journal-title":"Remote Sens. Environ."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"3161","DOI":"10.1007\/s11269-017-1722-6","article-title":"Satellite Soil Moisture: Review of Theory and Applications in Water Resources","volume":"31","author":"Srivastava","year":"2017","journal-title":"Water Resour. Manag."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Meng, F.X., Hou, R.J., Li, T.X., and Fu, Q. (2020). Variability of Soil Water Heat and Energy Transfer under Different Cover Conditions in a Seasonally Frozen Soil Area. Sustainability, 12.","DOI":"10.3390\/su12051782"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"2676","DOI":"10.1016\/j.renene.2018.06.106","article-title":"Impact of soil moisture on the long-term energy performance of an earth-air heat exchanger system","volume":"147","author":"Lin","year":"2020","journal-title":"Renew. Energy"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1016\/j.coldregions.2018.06.002","article-title":"Effect of freeze-thaw cycles on shear strength of saline soil","volume":"154","author":"Han","year":"2018","journal-title":"Cold Reg. Sci. Technol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"431","DOI":"10.5424\/sjar\/2007053-267","article-title":"The effect of freeze-thaw cycles on soil aggregate stability in different salinity and sodicity conditions","volume":"5","author":"Sahin","year":"2007","journal-title":"Span. J. Agric. Res."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"6663","DOI":"10.1038\/s41467-021-26907-3","article-title":"Global predictions of primary soil salinization under changing climate in the 21st century","volume":"12","author":"Hassani","year":"2021","journal-title":"Nat. Commun."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"981","DOI":"10.1007\/s12571-018-0812-5","article-title":"Evaluating the pathways from small-scale irrigation to dietary diversity: Evidence from Ethiopia and Tanzania","volume":"10","author":"Passarelli","year":"2018","journal-title":"Food Secur."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1872","DOI":"10.21273\/HORTSCI14271-19","article-title":"Potential of integrating biochar and deficit irrigation strategies for sustaining vegetable production in water-limited regions: A review","volume":"54","author":"Singh","year":"2019","journal-title":"HortScience"},{"key":"ref_16","first-page":"191","article-title":"Irrigation, a productive tool for food security\u2014A review","volume":"66","author":"Darko","year":"2016","journal-title":"Acta Agric. Scand. Sect. B\u2014Soil Plant Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1016\/j.agwat.2018.10.019","article-title":"Degradation of agricultural drainage water quantity and quality due to farmland expansion and water-saving operations in arid basins","volume":"213","author":"Hu","year":"2019","journal-title":"Agric. Water Manag."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"122","DOI":"10.1016\/j.geoderma.2018.08.030","article-title":"Towards predicting the soil-specific threshold electrolyte concentration of soil as a reduction in saturated hydraulic conductivity: The role of clay net negative charge","volume":"337","author":"Bennett","year":"2019","journal-title":"Geoderma"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Wang, J., Wang, W., Hu, Y., Tian, S., and Liu, D. (2021). Soil Moisture and Salinity Inversion Based on New Remote Sensing Index and Neural Network at a Salina-Alkaline Wetland. Water, 13.","DOI":"10.3390\/w13192762"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Zhu, K., Sun, Z., Zhao, F., Yang, T., Tian, Z., Lai, J., Zhu, W., and Long, B. (2021). Relating hyperspectral vegetation indices with soil salinity at different depths for the diagnosis of winter wheat salt stress. Remote Sens., 13.","DOI":"10.3390\/rs13020250"},{"key":"ref_21","first-page":"1","article-title":"Retrieval of the soil salinity from Sentinel-1 Dual-Polarized SAR data based on deep neural network regression","volume":"19","author":"Zhang","year":"2020","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1007\/s41651-023-00152-2","article-title":"Improving crop classification accuracy with integrated Sentinel-1 and Sentinel-2 data: A case study of barley and wheat","volume":"7","author":"Rasul","year":"2023","journal-title":"J. Geovisualization Spat. Anal."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"106","DOI":"10.1016\/j.advwatres.2017.09.006","article-title":"Four decades of microwave satellite soil moisture observations: Part 1. A review of retrieval algorithms","volume":"109","author":"Karthikeyan","year":"2017","journal-title":"Adv. Water Resour."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"262","DOI":"10.1109\/LGRS.2011.2165932","article-title":"Soil salinity impacts on L-Band remote sensing of soil moisture","volume":"9","author":"McColl","year":"2012","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"112059","DOI":"10.1016\/j.rse.2020.112059","article-title":"A novel approach to quantify soil salinity by simulating the dielectric loss of SAR in three-dimensional density space","volume":"251","author":"Periasamy","year":"2020","journal-title":"Remote Sens. Environ."},{"key":"ref_26","first-page":"405","article-title":"Effect of salinity on the dielectric properties of water","volume":"50","author":"Gadani","year":"2012","journal-title":"Indian J. Pure Appl. Phys."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Park, C.-H., Behrendt, A., LeDrew, E., and Wulfmeyer, V.J.R.S. (2017). New approach for calculating the effective dielectric constant of the moist soil for microwaves. Remote Sens., 9.","DOI":"10.3390\/rs9070732"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1109\/TGRS.1985.289498","article-title":"Microwave dielectric behavior of wet soil-Part2: Dielectric mixing models","volume":"23","author":"Dobson","year":"1985","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"93","DOI":"10.1109\/PROC.1974.9388","article-title":"High dielectric constant microwave probes for sensing soil moisture","volume":"62","author":"Birchak","year":"1974","journal-title":"Proc. IEEE"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"2059","DOI":"10.1109\/TGRS.2008.2011631","article-title":"Physically and Mineralogically Based Spectroscopic Dielectric Model for Moist Soils","volume":"47","author":"Mironov","year":"2009","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"288","DOI":"10.1109\/TGRS.1980.350304","article-title":"An empirical-model for the complex dielectric permittivity of soils as a function of water-content","volume":"18","author":"Wang","year":"1980","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2544","DOI":"10.1109\/TGRS.2010.2040034","article-title":"Temperature-Dependable Microwave Dielectric Model for an Arctic Soil","volume":"48","author":"Mironov","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"574","DOI":"10.1029\/WR016i003p00574","article-title":"Electromagnetic determination of soil water content: Measurements in coaxial transmission lines","volume":"16","author":"Topp","year":"1980","journal-title":"Water Resour. Res."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Liu, J., and Liu, Q. (2020). Soil Moisture Estimate Uncertainties from the Effect of Soil Texture on Dielectric Semiempirical Models. Remote Sens., 12.","DOI":"10.3390\/rs12142343"},{"key":"ref_35","first-page":"1","article-title":"An Improved Model for Estimating the Dielectric Constant of Saline Soil in C-Band","volume":"19","author":"Dong","year":"2021","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_36","unstructured":"Hu, Q.R., Shao, Y., and Guo, H.D. (2003, January 21\u201325). Microwave dielectric behavior of MoistSalt soil\u2014Experimental observations and improved dielectric models. Proceedings of the 23rd International Geoscience and Remote Sensing Symposium (IGARSS 2003), Toulouse, France."},{"key":"ref_37","first-page":"440","article-title":"Dielectric properties of saline soils and an improved dielectric model in C-band","volume":"53","author":"Wu","year":"2014","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1109\/TAP.1977.1141539","article-title":"Improved Model for Dielectric-constant of Sea-water at Microwave-frequencies","volume":"25","author":"Klein","year":"1977","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"733","DOI":"10.1109\/TMTT.1971.1127617","article-title":"Equations for Calculating Dielectric Constant of Saline Water","volume":"MT19","author":"Stogryn","year":"1971","journal-title":"IEEE Trans. Microw. Theory Technol."},{"key":"ref_40","first-page":"1","article-title":"Impact of Soil Salinity on Soil Dielectric Constant and Soil Moisture Retrieval From Active Microwave Remote Sensing","volume":"60","author":"Gao","year":"2022","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Fahrnberger, G. (2019, January 5\u20137). Outlier removal for the reliable condition monitoring of telecommunication services. Proceedings of the 2019 20th International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT), Gold Coast, Australia.","DOI":"10.1109\/PDCAT46702.2019.00052"},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"Lee, J., Park, S., and Lee, J.J.A.S. (2022). Study on the Technology Trend Screening Framework Using Unsupervised Learning. Appl. Sci., 12.","DOI":"10.3390\/app12178920"},{"key":"ref_43","doi-asserted-by":"crossref","unstructured":"Wu, Y., and Wang, W. (2011, January 20\u201322). Modelling the backscattering coefficient of salt-affected soils using AIEM model. Proceedings of the Earth Resources and Environmental Remote Sensing\/GIS Applications II, Prague, Czech Republic.","DOI":"10.1117\/12.897933"},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Jin, X., Yang, W., Gao, X.Q., and Li, Z.C. (2020). Analysis and Modeling of the Complex Dielectric Constant of Bound Water with Application in Soil Microwave Remote Sensing. Remote Sens., 12.","DOI":"10.3390\/rs12213544"},{"key":"ref_45","unstructured":"Xiong, W.C., Shao, Y., and IEEE (2004, January 20\u201324). Models for imaginary part of dielectric constant of moisture and salt soil. Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, Anchorage, AK, USA."},{"key":"ref_46","doi-asserted-by":"crossref","unstructured":"Vugrin, K.W., Swiler, L.P., Roberts, R.M., Stucky-Mack, N.J., and Sullivan, S.P. (2007). Confidence region estimation techniques for nonlinear regression in groundwater flow: Three case studies. Water Resour. Res., 43.","DOI":"10.1029\/2005WR004804"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/16\/3\/452\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T13:48:35Z","timestamp":1760104115000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/16\/3\/452"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,1,24]]},"references-count":46,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2024,2]]}},"alternative-id":["rs16030452"],"URL":"https:\/\/doi.org\/10.3390\/rs16030452","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,1,24]]}}}