Salinization and Yield Potential of a Salt-Laden Californian Soil: an In Situ Geophysical Analysis

Cassel, F L; Goorahoo, Dave; Sharmasarkar, Shankar

doi:10.1007/s11270-015-2682-1

Cited by 28 publications

(7 citation statements)

References 16 publications

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“…Soil MC is an important water source, and wetland damage and degradation are closely related to water (Wang et al, 2011). Soil Sa, which is related to the salinization, considerably affects soil quality, plant community, and crop yield and severely influences ecosystem health (Aragüés et al, 2014;Cassel et al, 2015;Wang et al, 2018). Soil pH is also a restricting factor for vegetation condition, and limitations to crop production may emerge when soil is excessively acidic or alkaline (Filippi et al, 2018).…”

Section: Estuarine Wetland Gradient Effects Assessment 241 Establismentioning

confidence: 99%

Spatiotemporal Variation of Plant Diversity Under a Unique Estuarine Wetland Gradient System in the Yellow River Delta, China

Sun

Chi

et al. 2020

Chin. Geogr. Sci.

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Multiple natural and human factors in estuarine wetlands result in complicated land surface characteristics with distinct spatial and temporal heterogeneities, thereby contributing to the difficulty in identifying spatiotemporal variations and influencing factors of plant diversity. A unique estuarine wetland gradient system (UEWGS) consisting of soil, vegetation, heat, distance, landscape, and anthropogenic gradients was established based on the ecological features of estuarine wetland through remote sensing and field investigation methods. It resolved the complicated land surface characteristics, covered all aspects of factors influencing plant diversity, and possessed distinct spatiotemporal heterogeneities. The Yellow River Delta, the largest estuarine wetland in the northern China, was selected as the study area to demonstrate UEWGS in four seasons in 2017. A total of 123 species were recorded with considerable seasonal difference. Phragmites australis, Suaeda salsa, and Tamarix chinensis were the dominant species, and crop species also played important roles. In single effect, all aspects of gradients exerted significant influences, yet only vegetation gradient possessed significant influences in all seasons. In comprehensive effect, soil, vegetation, heat, and distance gradients showed significant gross influences. Moisture content in soil gradient and net primary productivity in vegetation gradient possessed significant net influences in all seasons and can be considered as the main driving factor and indicator, respectively, of plant diversity. The results validated the significance of UEWGS in revealing the plant diversity spatiotemporal characteristics and influencing factors, and UEWGS possessed universal applicability in the spatiotemporal analysis of plant diversity in estuarine areas.

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Section: Estuarine Wetland Gradient Effects Assessment 241 Establismentioning

confidence: 99%

Spatiotemporal Variation of Plant Diversity Under a Unique Estuarine Wetland Gradient System in the Yellow River Delta, China

Sun

Chi

et al. 2020

Chin. Geogr. Sci.

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“…The EM readings and their corresponding locations were instantaneously recorded to an on-board computer through digital interfaces. The fundamentals of the EM technique were already discussed by Cassel et al (2015), who demonstrated that the dual-dipole EM survey offered a rapid and effective tool for salinity assay in central California.…”

Section: Soil Survey and Analysismentioning

confidence: 99%

Spatial Analysis of Salt Heterogeneity in a Central Californian Grape Field

Cassel

Sharma

2017

ENRR

Self Cite

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Grape is one of the major crops produced in California; however, moderate salt concentrations in the soil pore space can affect its growth. Therefore, it is important that the root zone salinity be rigorously monitored and maintained below the threshold limit for grape. Spatial analysis of salt heterogeneity can facilitate site-specific management for the crop. We conducted an electromagnetic salinity survey followed by semivariance modeling and kriging analyses in order to quantify the spatial variability and structure of salt distributions in a central Californian grape field. Soils in the study area had silty clayey texture and the salinity across the root zone remained largely elevated with random variations. The kriging analysis demonstrated a large spatial dependence of salinity that extended beyond a 1000 m radius. The isotropic nature of the spatial correlation structure produced an omnidirectional variogram. The overall salinity levels across the field surpassed the salt tolerance threshold for grape and the spatial analyses identified sensitive zones and their structures that require precise adaptive management.

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“…Nine factors, including BD, pH, MC, Sa, TC, TN, OM, AP, and AK, were used as the soil indicators. BD is a physical parameter that indicates soil porosity and gas; pH in uences soil structure, effectiveness of nutrient elements, microbial activity, and plant growth; MC serves as the main water source for vegetation; Sa represents the soil salinization, which greatly threatens ecosystem health; TC, TN, and OM involve various biogeochemical cycles, of which the latter two, along with AP and AK, are important indicators of soil fertility (Batjes, 1996;Reeves, 1997;Galloway et al, 2008;Cassel et al, 2015).…”

Section: Soil Indicatorsmentioning

confidence: 99%

Spatial Responses of Vegetation-Soil System to Complex Factors in a Sandy-Rocky Island Chain

Chi¹,

Xie²

2021

Preprint

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The vegetation-soil system is fundamental to island ecosystem and changes considerably across sandy and rocky islands due to different natural and anthropogenic factors. An island chain, which is characterized by the coexistence of sandy and rocky islands, the connection of the islands by bridges, and complex influencing factors, was used as the study area. The vegetation-soil system was represented using different indicators and three newly-proposed indices, namely, vegetation health index (VHI), soil health index (SHI), and vegetation-soil system health index (VSSHI). The complex factors were identified in aspects of island basic factors, landscape pattern, terrain condition, and ecological indices. Then, the spatial responses of the system to the factors were analyzed at island and site scales. Results indicated that the vegetation-soil system showed similar and different responses to the complex factors across the dual scales. The similarity was represented by the higher sensitivities of VHI and VSSHI compared with that of SHI at both scales, and the difference mainly indicated that the influences of landscape pattern factors distinctly decreased along the scales from island to site. Island area, sea reclamation proportion, vegetation proportion, and natural ecosystem damaged index were the most important factors at island scale, while the ecological indices showed the highest influences at site scale. The study revealed the spatial characteristics of the vegetation-soil system across different types of islands, clarified the spatial responses of the system to complex factors at the dual scales, and identified the main influencing factors of the system.

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Salinization and Yield Potential of a Salt-Laden Californian Soil: an In Situ Geophysical Analysis

Cited by 28 publications

References 16 publications

Spatiotemporal Variation of Plant Diversity Under a Unique Estuarine Wetland Gradient System in the Yellow River Delta, China

Spatiotemporal Variation of Plant Diversity Under a Unique Estuarine Wetland Gradient System in the Yellow River Delta, China

Spatial Analysis of Salt Heterogeneity in a Central Californian Grape Field

Spatial Responses of Vegetation-Soil System to Complex Factors in a Sandy-Rocky Island Chain

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