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Estimates and determinants of soil organic carbon and total nitrogen stocks up to 5 m depth across a long transect on the Loess Plateau of China by Chencheng Zhang; Yunqiang Wang; Xiaoxu Jia; Ming’an Shao is a Environmental Science article available to read on EtoBox.

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Purpose Carbon (C) and nitrogen (N) soil profiles are influenced by several environmental factors. However, the contents and distributions of these elements in deep soils and sediments are largely underestimated. We aimed to estimate the stocks, patterns, and driving factors of deep soil C and N on the Chinese Loess Plateau (CLP) after large-scale ecological restoration projects. Materials and methods Soil organic carbon (SOC) and total nitrogen (TN) contents in different soil layers were measured directly at 86 sites along a regional transect across the CLP. Results and discussion SOC and TN contents ranged from 1.97 to 6.83 g C kg -1 and 0.24 to 0.72 g N kg -1 , respectively, as the soil depth varied from 0 to 5 m. The mean contents and degrees of variability of SOC and TN decreased with the increasing of soil depth. Based on SOC and TN content patterns, we divided the 0-5-m soil profile into layers of 0-0.1, 0.1-0.4, 0.4-1, and 1-5 m. In the 1-5-m soil layer, approximately 70% of the mean SOC stock (14.97 kg C m -2 ) and 71% of the mean TN stock (1.75 kg N m -2 ) were stored. A partial least square regression model showed satisfactory predictive performance, with R 2 and Q 2 > 0

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Author

Chencheng Zhang; Yunqiang Wang; Xiaoxu Jia; Ming’an Shao

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)