Determination of soil physicochemical attributes in farming sites through visible, near-infrared diffuse reflectance spectroscopy and PLSR modeling

Vibhute, Amol D.; Kale, K. V.; Mehrotra, S. C.; Dhumal, Rajesh K.; Nagne, Ajay D.

doi:10.1186/s13717-018-0138-4

Cited by 40 publications

(9 citation statements)

References 27 publications

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“…This study found a positive correlation between BD and silt, which is consistent with the study by Amanuel et al (2018) and contrary to the study by Assefa and Wossenu (2016). There was a negative correlation between the particle size distribution of sand and silt content, which is consistent with the study by Vibhute et al (2018). While soil-mediated effects on avifaunal habitat preference have been recognized (Meyer et al 2015), however, there are scanty studies documenting such effects on a particular species.…”

Section: Discussionsupporting

confidence: 87%

Assessing the habitat suitability of paddy fields for avian indicators based on hydropedological parameters of the wet agricultural soil along the Cauvery delta basin, India

Menon

2020

Paddy Water Environ

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Paddy fields provide a broad range of habitats to wintering waterbirds as natural wetlands have declined worldwide. However, the intensification of farming practices has altered the microclimates of the wet agricultural soil, the composition of soil invertebrates, thus indirectly affecting the avifauna. This study evaluated the importance of paddy fields as wintering grounds for two avian indicators Asian openbill stork (Anastomus oscitans), and the Black-headed ibis (Threskiornis melanocephalus) along the Cauvery delta basin, widely known as the granary of Tamil Nadu, South India. Several stretches of this agricultural belt have recorded a drastic reduction in crop cover thereby threatening the species that forage these mosaics. This entire delta region is under threat and is increasingly shrinking due to indiscriminate sand mining activities causing irreparable damage to soil, fauna, and agriculture. The erratic monsoons have forced wading species to initiate long migrations in response to climatic adaptations, thus impairing the existing population. The present study focused on the abundance patterns of two wading birds and their association with the hydropedological parameters of the flooded soil along the deltaic dynamic mosaic. The relative abundance of the avifauna was documented for 24 months using unlimited radius point counts. The hydropedological parameters recorded were pH, electrical conductivity, total alkalinity, calcium carbonate, organic matter, total organic carbon, nitrogen, phosphorus, potassium, chloride, sodium, magnesium, calcium, sulfur, moisture, the particle size distribution of sand, silt and clay, water holding capacity, and bulk density. The results indicate that paddy fields are excellent habitat for A. oscitans and T. melanocephalus and are strongly influenced by landscape characteristics, availability of feeding grounds, and hydropedological parameters of the wet soil. Among the hydropedological parameters, organic matter and nitrogen exhibited a negative correlation and the percent silt content showed a positive correlation to A. oscitans. Similarly, T. melanocephalus showed a negative correlation to chloride and sodium, and a positive correlation to nitrogen. The contrasting effects of hydropedological parameters could be explained by differential thermal tolerance levels and metabolic requirements of the species or may be mediated by changes in the macrofaunal composition. The wet agricultural soil exhibited fewer differences across salinity classes, particle size distribution especially silt and clay, organic matter, total organic carbon, pH and bulk density, and greater differences among calcium content, water holding capacity, the particle size distribution of sand, and electrical conductivity across delta zones. Our study highlights the need to consider hydropedological factors of the wet paddy soil when selecting conservation sites on agro-landscapes for migratory wetland birds. Agricultural policies should aim at considering these cultural landscapes along the delta region...

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Section: Discussionsupporting

confidence: 87%

Assessing the habitat suitability of paddy fields for avian indicators based on hydropedological parameters of the wet agricultural soil along the Cauvery delta basin, India

Menon

2020

Paddy Water Environ

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“…Spectral data analysis is performed with the use of multivariate statistical methods, the success of which is highly dependent on the selected calibration method [38]. PLSR is the most commonly-used linear method to describe the relationship between spectral data and soil properties due to its interpretability and low computation time [39,40]. Thus, it has been observed that the aforementioned relationship is not always linear, and that therefore PLSR could be considered insufficient for modelling soil properties [41].…”

Section: Multivariate Calibrationsmentioning

confidence: 99%

From Laboratory to Proximal Sensing Spectroscopy for Soil Organic Carbon Estimation—A Review

et al. 2020

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Rapid and cost-effective soil properties estimations are considered imperative for the monitoring and recording of agricultural soil condition for the implementation of site-specific management practices. Conventional laboratory measurements are costly and time-consuming, and, therefore, cannot be considered appropriate for large datasets. This article reviews laboratory and proximal sensing spectroscopy in the visible and near infrared (VNIR)–short wave infrared (SWIR) wavelength region for soil organic carbon and soil organic matter estimation as an alternative to analytical chemistry measurements. The aim of this work is to report the progress made in the last decade on data preprocessing, calibration approaches, and system configurations used for VNIR-SWIR spectroscopy of soil organic carbon and soil organic matter estimation. We present and compare the results of over fifty selective studies and discuss the factors that affect the accuracy of spectroscopic measurements for both laboratory and in situ applications.

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“…The initial model contained eight predictors (RMSEP= 0.80 and R 2 = 0.15), whereas the final model contained only four predictors (RMSEP= 0.79 and R 2 = 0.19). An accurate and stable model is indicated by a lower RMSE and a higher R 2 (Vibhute, Kale, Mehrotra, Dhumal, & Nagne, ). In PLS regression plots, variables located on the perimeter of the circle are strongly correlated.…”

Section: Methodsmentioning

confidence: 99%

On the sunny side of (new) life: Effect of sunshine duration on age at first reproduction in Japanese macaques (Macaca fuscata)

Pflüger

Pink

Böck

et al. 2019

American J Primatol

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To produce offspring early in life is energetically demanding and depends greatly on environmental conditions. In female primates, age at first reproduction (AFR) has been associated with social parameters (e.g., population density and social rank), food availability and meteorological conditions (e.g., photoperiod, rainfall patterns, and temperature). Regarding the latter, less attention has been given to the influence of sunshine. In nonhuman primates, including the northern‐most distributed Japanese macaque (Macaca fuscata), sunbathing is an effective thermoregulatory strategy to maintain sufficient energy intake during harsh winter months. Furthermore, the energetic value of sunshine and its role in the synthesis of essential vitamins important for sexual development and overall fertility is well investigated using human and animal models. In the present study, we hypothesized that female's AFR is influenced by the amount of sunshine in a semi‐free‐ranging, provisioned a group of Japanese macaques. To test this, we gathered data on sunshine duration in the year females theoretically experienced the onset of puberty. This phase of the female life cycle is particularly prone to the effects of environmental conditions. In addition to the investigation of sunshine duration and other meteorological conditions (i.e., rainfall and temperature) we controlled for social parameters (i.e., group size and sex ratio) as potential covariates. We found a clear effect of sunshine duration on female AFR: Females who entered puberty in years with more sunshine reproduced for the first time at significantly younger ages than females who experienced less sunshine during this specific period of their development. Possible mechanisms for how the sunshine influences sexual maturation in Japanese macaques are discussed.

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Determination of soil physicochemical attributes in farming sites through visible, near-infrared diffuse reflectance spectroscopy and PLSR modeling

Cited by 40 publications

References 27 publications

Assessing the habitat suitability of paddy fields for avian indicators based on hydropedological parameters of the wet agricultural soil along the Cauvery delta basin, India

Assessing the habitat suitability of paddy fields for avian indicators based on hydropedological parameters of the wet agricultural soil along the Cauvery delta basin, India

From Laboratory to Proximal Sensing Spectroscopy for Soil Organic Carbon Estimation—A Review

On the sunny side of (new) life: Effect of sunshine duration on age at first reproduction in Japanese macaques (Macaca fuscata)

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