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نتیجه جستجو - Ksat

تعداد مقالات یافته شده: 2
ردیف عنوان نوع
1 Development of functions to predict soil hydraulic properties that account for solution sodicity and salinity
توسعه توابع برای پیش‌بینی خواص هیدرولیکی خاک که سدیمی محلول و شوری را در نظر می‌گیرند-2021
Saturated soil hydraulic conductivity (Ksat) and the soil water characteristic curve have been predicted from soil texture, bulk density, and other soil physical properties. These previous functions do not account for soil clay mineralogy or soil solution composition. The objectives of this study were to: (1) analyze the performance of previously developed pedotransfer functions (PTFs) on saline and sodic soils, (2) predict hydraulic properties of saline and sodic soils with a range of clay mineralogy, and (3) develop PTFs that account for clay mineralogy and solution composition. Most PTFs do not perform well on soils with smectitic clay mineralogy and usually over- estimate Ksat and under-estimate soil water characteristic on smectite clay dominant soils. Accounting for soil cation exchange capacity (CEC) as an indicator of soil clay types and solution composition improved the pre- diction of Ksat which had a geometric root mean squared error of 3.28 cm day(cid:0) 1 compared to 6.04 cm day(cid:0) 1 for the best performing PTF from the literature. A PTF we developed to predict soil water characteristic curve was able to predict soil water characteristic curve with a root mean squared error of 0.032 g g(cid:0) 1 compared to 0.082 g g(cid:0) 1 for the best performing previously published PTF. The PTFs developed in this study improved prediction of soil hydraulic properties on salt affected soils by using soil CEC to account for soil clay behavior and respon- siveness to the soil solution composition. The PTFs reported here can easily be used to predict the Ksat and the soil water characteristic curve of soils in response to changes in irrigation water quality.
keywords: شوری خاک | سدیم خاک | تابع pedotransfer | احتباس آب | هدایت هیدرولیکی اشباع شده | Soil salinity | Soil sodicity | Pedotransfer function | Water retention | Saturated hydraulic conductivity
مقاله انگلیسی
2 Identifying regionalized co-variate driving factors to assess spatial distributions of saturated soil hydraulic conductivity using multivariate and state-space analyses
شناسایی عوامل محرک متغیر منطقه ای برای ارزیابی توزیع مکانی هدایت هیدرولیکی خاک اشباع شده با استفاده از تجزیه و تحلیل چند متغیره فضای دولت-2020
Saturated soil hydraulic conductivity (Ksat) is a key factor in hydrological management projects and its variability along the landscape hinders its correct use in the formulation of such projects. Ksat varies under different climatic and hydrological conditions at spatial scales as reported in several studies. However, co-regionalization of Ksat remains a challenging aspect with regard to identifying supportive co-variates and suitable spatial models. The objectives of this study were to (i) identify factors that relate Ksat with soil and topographic attributes and land-use systems along a 15-km transect using principal component analysis, and (ii) describe the spatial continuum of Ksat across the transect through co-regionalization with autoregressive state-space models. The transect was established in the Fragata River Watershed (FRW), Southern Brazil. One hundred soil sampling points were distributed along the transect at equal distances (150 m). Clay and sand fractions, soil organic carbon content, soil bulk density, soil macroporosity, Ksat, and the soil water retention curve were determined for the 0–20 cm layer at each point. Topographic attributes were derived from the digital elevation model and a land-use map was derived from satellite images. The highest and lowest spatial variabilities were exhibited by Ksat and soil organic carbon content, respectively. Applying the state-space approach, spatial relationships among Ksat and soil and topographic attributes, and land-use systems along the transect, could be found. Principal component analysis used jointly with state-space showed that macroporosity could be used as a proxy to estimate the spatial variation of Ksat in the FRW watershed, assessing surface and subsurface runoff potentials at areas of different land-use. Further studies should be carried out to investigate the use of the type of land-use system as a soil structural predictor of the spatial variations of Ksat at the watershed scale since it is nowadays an “easy-to-measure” variable from satellite images.
Keywords: Ksat | Soil and topographic attributes | Spatial variability | Land-use system
مقاله انگلیسی
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