Impacts of land use and salinization on soil inorganic and organic carbon in the middle-lower Yellow River Delta

doi:10.1016/S1002-0160(21)60018-8

Pedosphere

Volume 31, Issue 6, December 2021, Pages 839-848

https://doi.org/10.1016/S1002-0160(21)60018-8 Get rights and content

Abstract

Soil inorganic carbon (SIC) is an important reservoir of carbon (C) in arid, semi-arid, and semi-humid regions. However, knowledge is incomplete on the dynamics of SIC and its relationship with soil organic C (SOC) under different land use types in the semi-humid region, particularly in coastal zones impacted by soil salinization. We collected 170 soil samples from 34 profiles across various land use types (maize-wheat, cotton, paddy, and reed) in the middle-lower Yellow River Delta (YRD), China. We measured soil pH, electrical conductivity (EC), water-soluble salts, and SOC and SIC contents. Our results showed significant differences in both SOC and SIC among land use types. The dry cropland (maize-wheat and cotton) soils had significantly higher SOC and SIC densities (4.71 and 15.46 kg C m^–2, respectively) than the paddy soils (3.28 and 14.09 kg C m^–2, respectively) in the 0–100 cm layer. Compared with paddy soils, reed soils contained significantly higher SOC (4.68 kg C m^–2) and similar SIC (15.02 kg C m^–2) densities. There was a significant positive correlation between SOC and SIC densities over a 0–100 cm soil depth in dry cropland soils, but a negative relationship in the paddy soils. On average, SOC and SIC densities under maize-wheat cropping were 15% and 4% lower, respectively, in the salt-affected soils in the middle-lower YRD than the upper YRD. This study indicated that land use types had great influences on both SOC and SIC and their relationship, and salinization had adverse effect on soil C storage in the YRD.

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Citation Excerpt :
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Impacts of land use and salinization on soil inorganic and organic carbon in the middle-lower Yellow River Delta

Abstract

Geoderma

Catena

Soil Tillage Res

Environ Pollut

Catena

Agric Ecosyst Environ

Geoderma Reg

Catena

Agric Ecosyst Environ

J Environ Manag

Catena

Eur J Soil Sci

Environ Monit Assess

Agric Ecosyst Environ

Catena

Pedosphere

Land Use Policy

Phys Chem Earth, Parts A/B/C

Catena

Salt-affected soils, reclamation, carbon dynamics, and biochar: A review

J Soil Sediment

Total carbon and nitrogen in the soils of the world

Eur J Soil Sci

Chinese Soil Taxonomy

Organic and inorganic carbon in paddy soil as evaluated by mid-infrared photoacoustic spectroscopy

PLOS ONE

Global carbon stocks

Organic carbon in soils of the world

Soil Sci Soc Am J

Georelational analysis of soil type, soil salt content, landform, and land use in the Yellow River Delta, China

Environ Manag