20181130

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Author : 

Eleanor Hobley, Markus Steffens, Sara L. Bauke & Ingrid Kögel-Knabner

Year : 2018
Title : Hotspots of soil organic carbon storage revealed by laboratory hyperspectral imaging

Journal :  Scientific Reports

Comment: 



















 They tested the application of laboratory hyperspectral imaging with a variety of machine learning approaches to predict OC distribution in undisturbed soil cores. Despite a large increase in variance and reduction in OC content with increasing depth, the high resolution of the images enabled statistically powerful analysis in spatial distribution of OC in the soil cores. Laboratory hyperspectral imaging enables powerful, fine-scale investigations of the vertical distribution of soil OC as well as hotspots of OC storage in undisturbed samples, overcoming limitations of traditional soil sampling campaigns.

20181123

Author : 

Shengyao Jia, Hongyang Li, Yanjie Wang, Renyuan Tong and Qing Li

Year : 2017
Title : Hyperspectral Imaging Analysis for the Classification of Soil Types and the Determination of Soil Total Nitrogen

Journal :  Sensors

Comment: 

 In this work, hyperspectral imaging (HSI) technology was applied for the classification of soil types and the measurement of soil total nitrogen (TN) content. A total of 183 soil samples collected from Shangyu City (People’s Republic of China), were scanned by a near-infrared hyperspectral imaging system with a wavelength range of 874–1734 nm. 

 The successive projections algorithm (SPA) method was utilized to select effective wavelengths from the full spectrum. Pattern texture features (energy, contrast, homogeneity and entropy) were extracted from the gray-scale images at the effective wavelengths. The support vector machines (SVM) and partial least squares regression (PLSR) methods were used to establish classification and prediction models, respectively.…

20181115

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Author : 

Qingjun Guo, Guangxu Zhu, Harald Strauss, Marc Peters, Tongbin Chen, Junxing Yang, Rongfei Wei, Liyan Tian, Xiaokun Han

Year : 2016
Title : Tracing the sources of sulfur in Beijing soils with stable sulfur isotopes

Journal :  Journal of Geochemical Exploration

Comment: 




 Stable sulfur isotope analyses were applied in order to trace local sulfur sources and to identify sulfur turnover rates in Beijing soil. Anthropogenic sources and atmospheric deposition are the main processes responsible for the occurrence of sulfide, organic and sulfate sulfur in three soil profiles located in the vicinity of a steel company in Beijing, China. This input results in an atypical invariable sulfur isotopic composition along the vertical profiles. The δ34S values of soil sulfate from the industrial area revealed that both the topsoil and deep soil have been affected by industrial activities. This study suggests that an assessment of the vertical distribution of sulfur concentration and sulfur isotop…

20181108

Author : 

Stevenson, Bryan A
Parfitt, RL
Schipper, Louis A
Baisden, W Troy
Mudge, P

Year : 2010
Title : Relationship between soil δ15N, C/N and N losses across land uses in New Zealand

Journal :  Agriculture, ecosystems & environment

Comment: 

Several of the major processes that result in N loss from soil (nitrification, ammonia volatilization, and denitrification) discriminate against 15N and fractionate the stable N isotopes, thus δ15N of ecosystem components has been suggested as an indicator of ecosystem N leakiness.

Mean soil δ15N differed between land uses with intensively managed cropping having the highest mean soil δ15N (6.2‰) followed by dairy (5.4‰), drystock (3.8‰), forestry (2.8‰) and indigenous forests (2.1‰). Over all land uses there was a negative correlation between δ15N and the soil C/N ratio (p =−0.73) and regression analysis indicated a relatively strong linear relationship between δ15N and C/N (r2 = 0.56, P < 0.001) when cropping sites (where significant loss of soil …

20181101

Author : 
Vasenev, V. Kuzyakov, Y.

Year : 2018
Title : Urban soils as hot spots of anthropogenic carbon accumulation: Review of stocks, mechanisms and driving factors

Journal :  Land Degradation & Development

Comment: 

Urban soils and cultural layers may accumulate C over centuries and consequently large C stocks may be sequestered beneath cities. Substantial amounts of SOC, SIC, and N are sequestered in the subsoils, cultural layers, and sealed soils, underlining the importance of these hidden stocks for C assessments. Long‐term С input from outside the cities and associated C accumulation coincided with upward soil growth of ~50 cm per century, and continuous accumulation of 15–30 kg C/m2 per century in urban soils and cultural layers. They conclude that, despite the relatively small area of cities, urban soils are hot spots of long‐term soil C sequestration worldwide, and the importance of urban soils will increase in future with global urbanization.

20181025

Author : 
Dustin L. Herrmann, Laura A. Schifman, and William D. Shuster

Year : 2018
Title : Widespread loss of intermediate soil horizons in urban landscapes

Journal :  PNAS

Comment: 

Urbanization processes modify ecosystem function by changing the layers of soils identified as soil horizons. Soil horizons are integrative proxies for suites of soil properties and as such can be used as an observable unit to track modifications within soil profiles. 

Here, in an analysis of 11 cities representing 10 of the 12 soil orders, they show that urban soils have ∼50% fewer soil horizons than preurban soils. Specifically, B horizons were much less common in urban soils and were replaced by a deepening of A horizons and a shallowing of C horizons. This shift is likely due to two processes: (i) local management, i.e., soil removal, mixing, and fill additions, and (ii) soil development timelines, i.e., urbanized soils are young and have had short time periods for soil horizon development since urbanizatio…

20181018

Author : 
Josep G. Canadell & E. Detlef Schulze

Year : 2014
Title : Global potential of biospheric carbon management for climate mitigation

Journal :  Nature Communications

Comment: 

Land-based biological carbon mitigation strategies are considered an important and viable pathway towards climate stabilization. However, to satisfy the growing demands for food, wood products, energy, climate mitigation and biodiversity conservation—all of which compete for increasingly limited quantities of biomass and land—the deployment of mitigation strategies must be driven by sustainable and integrated land management. If executed accordingly, through avoided emissions and carbon sequestration, biological carbon and bioenergy mitigation could save up to 38 billion tonnes
of carbon and 3–8% of estimated energy consumption, respectively, by 2050.