Estimating topsoil SOC sequestration in croplands of eastern China from 1980 to 2000

Cropland may play a significant role in mitigating climate change by sequestering atmospheric CO2. To evaluate the extent of carbon sequestration, an examination of the changes in soil organic carbon (SOC) is essential. We compiled data from 50 published papers that reported changes in the SOC in eastern China over an area of 17.9 Mha. These data covered 76% of the total cropland in this area, with >8500 soil sample measurements. Changes in SOC density (ΔDoc ) in cultivated layers (Ap horizon) were estimated on the basis of the administrative regions and soil usage (paddy and upland soils), respectively. Linear relationships between ΔDoc in topsoil (Ap and P horizons, P horizon refers to the sub-cultivated layer) and in the Ap horizon were established to estimate the changes in topsoil organic carbon density. Changes in the SOC stock were determined from the acreage-weighted ΔDoc . Results indicated that the topsoil organic carbon density of croplands in eastern China increased by 5.78 t C/ha between 1980 and 2000, ranging from 4.24 to 7.49 t C/ha. The SOC stock increased by 75.4–134.1 Tg with an average of 103.5 Tg. Paddy soils, comprising 51.7% of the cropland area, accounted for ~70% of the total increase. The SOC increase in the Ap horizon accounted for ~88% (upland soils) and 71% (paddy soils) of that in the topsoil, respectively. The increase in SOC may be attributed to an increased biomass (e.g. residue retainment) input into soils due to increased crop net primary production.

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Contrasting contribution of fungal and bacterial residues to organic carbon accumulation in paddy soils across eastern China

Biology and Fertility of Soils ◽

10.1007/s00374-019-01390-7 ◽

2019 ◽

Vol 55 (8) ◽

pp. 767-776 ◽

Cited By ~ 5

Author(s):

Yinhang Xia ◽

Xiangbi Chen ◽

Yajun Hu ◽

Shengmeng Zheng ◽

Zhao Ning ◽

...

Keyword(s):

Organic Carbon ◽

Eastern China ◽

Carbon Accumulation ◽

Paddy Soils

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Impact of land use change on organic carbon sequestration in Arenosol

Agricultural and Food Science ◽

10.23986/afsci.69641 ◽

2019 ◽

Vol 28 (1) ◽

Author(s):

Asta Kazlauskaite-Jadzevice ◽

Liudmila Tripolskaja ◽

Jonas Volungevicius ◽

Eugenija Baksiene

Keyword(s):

Organic Carbon ◽

Arable Land ◽

Land Conversion ◽

Land Uses ◽

Arable Soils ◽

Ap Horizon ◽

Soc Stock ◽

Organic Carbon Sequestration ◽

Pine Forest Soil

Conversion of arable soils into other land uses can stabilize and increase accumulation of soil organic carbon (SOC) and in addition prevent deterioration in its properties. The data has shown changes in SOC sequestration in Ap horizon after arable land conversion (1995–2015) into managed grassland, abandoned and pine afforested. SOC in Arenosol topsoil was positively affected by long term fallow and conversion into grassland. Abandoned land and fertilised managed grassland accumulated significantly more SOC, 48% and 38% respectively compared with arable land. In unfertilised managed grassland SOC stocks decreased 2.3% during 21 years, but losses were lower than in fertilised arable land. Pine afforestation of loamy sand helped to reduce the intensity of SOM mineralization compared to arable land. The Ap horizon thickness in pine forest soil increased from 28 to 31 cm during 21 years period. However, SOC stock decreased by 1% due to reduction in carbon concentration.

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Increasing soil carbon stocks in eight typical forests in China

10.5194/bg-2019-319 ◽

2019 ◽

Author(s):

Jianxiao Zhu ◽

Chuankuan Wang ◽

Zhang Zhou ◽

Guoyi Zhou ◽

Xueyang Hu ◽

...

Keyword(s):

Organic Carbon ◽

Forest Soils ◽

Net Primary Production ◽

Field Measurements ◽

Northern China ◽

Aboveground Net Primary Production ◽

Forest Sites ◽

Soil Carbon Stocks ◽

Soc Stock ◽

Soc Stocks

Abstract. Forest soils represent a major stock of organic carbon (C) in the terrestrial biosphere, but the dynamics of soil organic carbon (SOC) stock are poorly quantified, especially based on direct field measurements. In this study, we investigated the 20-year changes in the SOC stocks at eight sites from southern to northern China. The averaged SOC stocks increased from 125.2 ± 85.2 Mg C ha−1 in the 1990s to 133.6 ± 83.1 Mg C ha−1 in the 2010s across the forest sites, with a mean increase of 127–908 kg C ha−1 yr−1. This SOC accumulation was resulted primarily from both leaf litter and fallen logs and equivalent to 3.6–16.3 % of aboveground net primary production. Our findings provide strong evidence that China's forest soils have been acting as significant carbon sinks although their strength varies with forests in different climates.

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Effects of soil map scales on simulating soil organic carbon changes of upland soils in Eastern China

Geoderma ◽

10.1016/j.geoderma.2017.10.017 ◽

2018 ◽

Vol 312 ◽

pp. 159-169 ◽

Cited By ~ 6

Author(s):

Liming Zhang ◽

Yaling Liu ◽

Xiaodi Li ◽

Linbin Huang ◽

Dongsheng Yu ◽

...

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Eastern China ◽

Soil Map ◽

Upland Soils

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Changes in soil organic carbon stocks under 10-year conservation tillage on a Black soil in Northeast China

The Journal of Agricultural Science ◽

10.1017/s002185961500132x ◽

2016 ◽

Vol 154 (8) ◽

pp. 1425-1436 ◽

Cited By ~ 10

Author(s):

A. Z. LIANG ◽

X. M. YANG ◽

X. P. ZHANG ◽

X. W. CHEN ◽

N. B. MCLAUGHLIN ◽

...

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Northeast China ◽

Conservation Tillage ◽

Soil Depth ◽

Black Soil ◽

Tillage Practices ◽

Linear Relationships ◽

Soc Stock ◽

Plough Layer

SUMMARYBiased assessment of tillage impacts on soil organic carbon (SOC) sequestration are often associated with a lack of information on the initial level of SOC stocks. The present study reported the changes in SOC concentrations and stocks following 10-year different tillage practices relative to the initial SOC levels. The tillage trial included no tillage (NT), ridge tillage (RT) and mouldboard plough (MP) on a Black soil (Hapludolls) in Northeast China. Results showed that tillage, soil depth and time significantly affected SOC concentration and SOC stock. Tillage and crop residue retention had great impacts on the SOC concentrations in the top 0·1 m layer. Compared with MP and NT, RT resulted in higher SOC concentration and SOC stock in the plough layer (0–0·2 m), which became more obvious with time. The soil under NT and RT had higher stratification ratios (SR) of SOC (SR, the ratio of SOC concentration in 0–0·05 m to that in 0·1–0·2 m) than under MP. Significant positive and nearly identical linear relationships between the SR of SOC and the duration of tillage practices occurred for both NT and RT soils; the increased SR in NT resulted from both SOC increase in surface and SOC decrease in subsurface soils, but in RT, the increased SR was only from a substantial SOC increase in surface soil. Accordingly, the present study highlights that RT was more helpful than NT in carbon sequestration for the studied Black soil in Northeast China.

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