Changes in surface soil organic/inorganic carbon concentrations and their driving forces in reclaimed coastal tidal flats

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

doi:10.1016/j.geoderma.2019.06.003

Cited by 30 publications

(21 citation statements)

References 64 publications

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“…In this study, we found that SOC and SON levels greatly increased following conversion of P. australis salt marsh into wheat and rapeseed fields (Table 1 ). This result is consistent with previous studies, which revealed that reclaimed farmlands effectually promoted SOC and SON sequestration by altering hydrological regimes from ditch drainage, diking, and irrigation, and lower soil pH and salinity relative to coastal wetlands 11 , 21 . It was inferred that greatly decreased soil pH and salinity, and increased inputs of aboveground biomass, as well as the application of chemical fertilizers contributed to greater SOC and SON accumulation in the wheat and oilseed rape fields compared to P. australis wetland (Table 1 ) 21 .…”

Section: Discussionsupporting

confidence: 93%

“…1 ) 32 . Over the last century, the wetlands of the Jiangsu coast have undergone intensive reclamation 11 . At present, most of coastal wetlands have been reclaimed and converted to aquaculture ponds, farmlands, and town construction lands, particularly in Dafeng and Sheyang counties (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Ultimately, these changes alter soil organic carbon and nitrogen (SOC and SON, respectively) sequestration in coastal wetlands 9 . Although the response of SOC and SON sequestration to coastal reclamation have been widely documented 2 , 10 , 11 , there remains no definitive consensus. For example, Ding et al 10 revealed that SOC and SON stocks were rapidly sequestered within an initial 50 years following the reclamation of coastal wetlands, and then increased slowly within the reclaimed paddy soil of China's Yangtze River Delta.…”

Section: Introductionmentioning

confidence: 99%

“…1 ) 4 . Numerous studies have documented the effects of coastal reclamation on ecosystem C and N sinks, especially on SOC and SON sequestration along the coasts of Eastern China 9 , 11 , 21 . Our previous study found that coastal reclamation greatly altered soil total, labile and recalcitrant organic C and N following the conversion of coastal wetlands to different reclaimed lands 21 .…”

Section: Introductionmentioning

confidence: 99%

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Coastal reclamation alters soil microbial communities following different land use patterns in the Eastern coastal zone of China

Yang

Jeelani

Cai

et al. 2021

Sci Rep

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Coastal reclamation seriously disturbs coastal wetland ecosystems, while its influences on soil microbial communities remain unclear. In this study, we examined the impacts of coastal reclamation on soil microbial communities based on phospholipid fatty acids (PLFA) analysis following the conversion of Phragmites australis wetlands to different land use types. Coastal reclamation enhanced total soil microbial biomass and various species (i.e., gram-positive bacterial, actinomycete, saturated straight-chain, and branched PLFA) following the conversion of P. australis wetland to aquaculture pond, wheat, and oilseed rape fields. In contrast, it greatly decreased total soil microbial biomass and various species following the conversion of P. australis wetland to town construction land. Coastal reclamation reduced fungal:bacterial PLFA, monounsaturated:branched PLFA ratios, whereas increasing gram-positive:gram-negative PLFA ratio following the conversion of P. australis wetland to other land use types. Our study suggested that coastal reclamation shifted soil microbial communities by altering microbial biomass and community composition. These changes were driven primarily by variations in soil nutrient substrates and physiochemical properties. Changes in soil microbial communities following coastal reclamation impacted the decomposition and accumulation of soil carbon and nitrogen, with potential modification of carbon and nitrogen sinks in the ecosystems, with potential feedbacks in response to climate change.

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Section: Discussionsupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coastal reclamation alters soil microbial communities following different land use patterns in the Eastern coastal zone of China

Yang

Jeelani

Cai

et al. 2021

Sci Rep

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“…After reclamation, the coastal reclaimed tidal flat environment has been largely altered; for example, redox conditions may have changed due to the lowering of the water table and aeration [6]. The tidal sediment gradually evolves into soil after coastal reclamation [7,8]. Land-use/land-cover (LULC) changes are important elements of environmental change [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Agricultural Reclamation on Soil Physicochemical Properties in the Mid-Eastern Coastal Area of China

Liu

Zhang

et al. 2021

Land

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Agricultural reclamation in coastal zones is effective for mitigating population pressure on the food supply. Soil properties are important factors influencing crop production in reclaimed coastal lands. This study aims to investigate the impacts of time and land use trajectories on soil physicochemical properties after reclamation. We sampled soils in areas that were reclaimed in 1999, 1998, 1991, 1989, 1986, 1981, and 1979 and determined some soil physicochemical properties such as electrical conductivity with a 1:5 soil:water ratio (EC1:5), exchange sodium percentage (ESP), sodium adsorption ratio (SAR), pH, organic matter (OM), total nitrogen (TN), alkaline hydrolyzable nitrogen (AN), cation exchange capacity (CEC), total phosphorus (TP), available phosphorus (TP) and soil particle size ratio. We analyzed their correlation with land use and the time since reclamation using one-way analysis of variance (ANOVA) and principal component analysis (PCA). The results showed that soil physicochemical properties changed significantly after agricultural reclamation. Soil EC1:5, ESP, and SAR declined rapidly, and OM, TN, and AN increased rapidly during the 29 years after reclamation. The soil particle size ratio was not significantly correlated with reclamation time. The land-use trajectories identified after reclamation had obvious effects on soil physicochemical properties. Aquaculture ponds were superior to cultivated land in terms of decreasing soil salinity but were inferior in terms of soil nutrient accumulation. In the future, more attention should be given to the environmental effects of agricultural reclaimed soils.

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Reclamation of coastal marshes to croplands shifts molecular composition of soil organic matter in the Bohai Rim

Xu,

Zhu,

Yang

et al. 2024

Land Degrad Dev

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Reclamation of coastal marshes to croplands lost massive reserves of soil organic matter (SOM). However, it is uncertain how reclamation shifts chemical composition of SOM and its size fractions. Here, we investigated this issue at two coastal marshes (Qilihai, degradation with seasonal waterlog; Beidagang, annual long‐term waterlog) along with adjacent long‐term reclaimed croplands on the coast of the Bohai Bay, China. Three SOM fractions: coarse particulate (cPOM, >250 μm), fine particulate (fPOM, 53–250 μm), and mineral‐associated organic matter (<53 μm) were analyzed by pyrolysis‐gas chromatography–mass spectrometry. Compared with the Qilihai marsh, the Beidagang marsh had higher SOM contents and lower proportions of microbial‐derived N‐containing compounds, which was attributed to the waterlogging‐induced weaker decomposition. Reclamation decreased the SOM contents (−53.6% to −63.3%) and proportions of lignin in cPOM (−44% to −52%) at both sites. However, reclamation‐induced shifts of molecular composition of SOM between the two sites diverged. At the Qilihai site, reclamation decreased the relative abundances of N‐containing compounds (−28%) but increased the proportions of lipids (+17%) and phenolics (+40.7%) in mineral‐associated organic matter. At the Beidagang site, reclamation decreased the proportions of monocyclic aromatics (−60.3% to −70.2%), but increased the relative abundances of N‐containing compounds (+175% to +407%) in all fractions. By contrast, the molecular composition of SOM at the two croplands had covergent pattern. In conclusion, despite of marsh locations with different waterlogging conditions, long‐term reclamation of wetlands to croplands generated convergent patterns in storage and molecular composition of SOM, which was attributed to the similar cropland cultivation.

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Changes in surface soil organic/inorganic carbon concentrations and their driving forces in reclaimed coastal tidal flats

Cited by 30 publications

References 64 publications

Coastal reclamation alters soil microbial communities following different land use patterns in the Eastern coastal zone of China

Coastal reclamation alters soil microbial communities following different land use patterns in the Eastern coastal zone of China

Effects of Agricultural Reclamation on Soil Physicochemical Properties in the Mid-Eastern Coastal Area of China

Reclamation of coastal marshes to croplands shifts molecular composition of soil organic matter in the Bohai Rim

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