Dynamics and driving factors of the organic carbon fractions in agricultural land reclaimed from coastal wetlands in eastern China

Zhang, Huan; Wu, Pingkeng; Fan, Manman; Zheng, Sulin; Wu, Jingtao; Yang, Xiaohui; Zhang, Ming; Yin, Anqi; Gao, Chao

doi:10.1016/j.ecolind.2018.01.039

Cited by 48 publications

(29 citation statements)

References 89 publications

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“…Coastal reclamation can greatly modify hydrodynamics, morphology, and sediment transportation of coasts 10 , and further alter soil physicochemical properties 4 . Generally, the alterations of land use patterns, plant community composition and productivity, as well as soil management practices are important ecological drivers for SOC and soil organic nitrogen (SON) sequestration 11,12 . Whereas, in salt-affected reclaimed soils, SOC and SON sequestration have not only been affected by general factors but also by specific soil physicochemical properties, especially salinity and alkalinity 12,13 .…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the alterations of land use patterns, plant community composition and productivity, as well as soil management practices are important ecological drivers for SOC and soil organic nitrogen (SON) sequestration 11,12 . Whereas, in salt-affected reclaimed soils, SOC and SON sequestration have not only been affected by general factors but also by specific soil physicochemical properties, especially salinity and alkalinity 12,13 . Salinity and alkalinity have been demonstrated to negatively affect SOC and SON accumulation through inhibiting plant growth, thus lessening plant materials entering the soil 12 , and decreasing soil organic matter (SOM) decomposition by restricting soil microbial activity 14 .…”

Section: Introductionmentioning

confidence: 99%

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Shift in soil organic carbon and nitrogen pools in different reclaimed lands following intensive coastal reclamation on the coasts of eastern China

Yang

Xia

Zhu

et al. 2019

Sci Rep

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The impacts of coastal reclamation on carbon (C) and nitrogen (N) sinks of coastal wetlands remain unclearly understood. This study was conducted to investigate the alterations of soil organic C and N (SOC and SON) pools following conversion of Phragmites australis salt marsh into fishpond, wheat and rapeseed fields and town construction land through reclamation along Jiangsu coast in eastern China. Coastal reclamation significantly increased stocks of soil total, labile and recalcitrant organic C and N (SLOC, SLON, SROC, and SRON), and concentrations of water-soluble organic C (WSOC), microbial biomass C and N (SMBC and SMBN), cumulative CO 2 -C mineralization (MINC) following conversion of P. australis salt marsh into fishpond, wheat and rapeseed fields. However, coastal reclamation reduced SOC, SLOC, SROC, SRON, WSOC, SMBC, SMBN, and MINC following conversion of P. australis salt marsh into town construction land. Our results suggest that coastal reclamation affects C and N sinks of coastal wetlands by changing SOC and SON pools size, stability and dynamics changes following conversion of P. australis salt marsh into other land use types. This finding were primarily attributed to alterations in quantity and quality of exogenous materials returning the soil, and soil physiochemical properties as affected by coastal reclamation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shift in soil organic carbon and nitrogen pools in different reclaimed lands following intensive coastal reclamation on the coasts of eastern China

Yang

Xia

Zhu

et al. 2019

Sci Rep

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“…Hydrology, litter input and fertilization regimes affect the accumulation and decomposition of the soil organic matter (Azam et al 2020;Belay-Tedla et al 2009;Hu et al 2017;Yang et al 2019). In wetland ecosystems, the concentrations of the SOC fractions have changed due to species invasion (Cheng et al 2008;Yang et al 2017a), salinity increase (Yang et al 2018) and land reclamation (Huo et al 2018;Zhang et al 2018). SOC LF I and LF II decreased due to a decrease in the organic matter input combined with the fast mineralisation of soil organic matter (SOM) during the conversion of pasture lands to agricultural lands, degradation of natural forest and tillage (Liu et al 2017;Muñoz-Romero et al 2017;Nath et al 2018).…”

Section: Effects Of Marsh Degradation On the Concentrations Of Soc Frmentioning

confidence: 99%

Response of the Organic Carbon Fractions and Stability of Soil to Alpine Marsh Degradation in Zoige, East Qinghai-Tibet Plateau

Zhang

et al. 2020

J Soil Sci Plant Nutr

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Soil organic carbon (SOC) fractions play a crucial role in the carbon cycle of alpine wetland ecosystems and regional climate regulation. In the last decades, alpine marshes at Tibetan Plateau have undergone increased degradation. The effects of marsh degradation on soil labile and recalcitrant organic carbon fractions and on SOC stability remain unclear. In this study, we investigated changes in SOC fractions with different biochemical recalcitrance and stability in the marsh ecosystems with various levels of degradation in the Zoige Wetland, Eastern Qinghai-Tibet Plateau. Soil samples of relatively pristine marsh (RPM), lightly degraded marsh (LDM), moderately degraded marsh (MDM), heavily degraded marsh (HDM) and severely degraded marsh (SDM) were collected and analysed using the acid hydrolysis method. Compared with RPM, the concentrations of SOC labile fraction I (non-cellulosic polysaccharides), SOC labile fraction II (cellulose) and recalcitrant organic carbon (ROC) in degraded marshes decreased significantly: 29-97, 38-95 and 32-99%, respectively, except for the LDM. The SOC recalcitrance index (RIc) in the HDM and SDM was significantly lower than that in RPM by 11-35 and 15-47%, respectively; compared with RPM, the stability of organic carbon was significantly lower in the HDM and SDM. Additionally, the marsh degradation increased vertical variation in the concentrations of SOC fractions. The degradation of alpine marshes decreases the capacity for carbon (C) sequestration via decreasing the resistance of SOC to biodegradation, indicating that the alpine marsh degradation may weaken the carbon sink capacity of the Zoige Plateau, thus aggravating the global greenhouse effect. Keywords Zoige. Marsh degradation. Labile organic carbon. Recalcitrant organic carbon. Soil organic carbon stability Highlights • Concentrations of labile and recalcitrant SOC decreased with marsh degradation. • Vertical variation in labile and recalcitrant SOC increased in degraded marshes. • Resistance of SOC to biodegradation decreased after marsh was moderately degraded. • Marsh degradation reduced the capacity of SOC sequestration.

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“…Agricultural soils have less SOC storage capacity than natural soils (Ajami et al, 2016;Yang et al, 2009), and increasing SOC contents not only improves the soil nutrient levels and soil structure of farmland but also is widely considered to mitigate anthropogenic CO 2 emissions via soil carbon sequestration (Chang et al, 2016;Han et al, 2017;Kabiri, Raiesi, & Ghazavi, 2016;Zhang, Wu, Fan, et al, 2018). However, the properties of SOC required for the above two benefits are contradictory.…”

Section: Introductionmentioning

confidence: 99%

Effects of agricultural land use change on organic carbon and its labile fractions in the soil profile in an urban agricultural area

Luo

Shen

et al. 2019

Land Degrad Dev

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The properties of soil organic carbon (SOC) required for carbon sequestration and nutrient availability are contradictory, and the changes in SOC caused by agricultural land use changes remain elusive. Data on the total soil organic carbon (TOC) and labile organic carbon, including easily oxidizable organic carbon (EOC), dissolved organic carbon (DOC), and microbial biomass carbon (MBC), of the soil profile were analysed for four typical agricultural land use scenarios in the Chengdu Plain, China. The impacts of agricultural land use changes on sequestration and nutrient availability of SOC were assessed in this urban agricultural area using the space‐for‐time substitution method. Conversion of land use from a traditional agricultural rotation (rice‐wheat/rapeseed rotation) to afforestation increased the MBC content and decreased the contents of EOC, DOC, and TOC due to the lower input of organic matter, improved aeration of the soil profile, and growth of aboveground biomass. Conversion of a traditional rotation to a rice–garlic rotation resulted in a significant increase in topsoil TOC, slight but insignificant decreases in subsoil TOC, and clear increases in labile organic carbon because of rice planting, rice straw mulch, and reasonable application of chemical fertilizers. In contrast, the conversion of a traditional rotation to a rice–leafy vegetable rotation decreased MBC due to the excessive use of chemical fertilizers that consequently increased EOC, DOC, and TOC. We conclude that afforestation on paddy soil has negative consequences for soil carbon sequestration and a rice–leafy vegetable rotation contributes to carbon sequestration but is detrimental to soil fertility. In addition, the MBC ratio in soil could be the optimal indicator for assessing SOC stability and soil fertility, and more attention should be paid to subsoil carbon changes.

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Dynamics and driving factors of the organic carbon fractions in agricultural land reclaimed from coastal wetlands in eastern China

Cited by 48 publications

References 89 publications

Shift in soil organic carbon and nitrogen pools in different reclaimed lands following intensive coastal reclamation on the coasts of eastern China

Shift in soil organic carbon and nitrogen pools in different reclaimed lands following intensive coastal reclamation on the coasts of eastern China

Response of the Organic Carbon Fractions and Stability of Soil to Alpine Marsh Degradation in Zoige, East Qinghai-Tibet Plateau

Effects of agricultural land use change on organic carbon and its labile fractions in the soil profile in an urban agricultural area

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