Soil‐Aggregate‐Associated Organic Carbon Along Vegetation Zones in Tidal Salt Marshes in the Liaohe Delta

Mao, Rong; Ye, Siyuan; Zhang, Xin‐Hou

doi:10.1002/clen.201800049

Cited by 8 publications

(4 citation statements)

References 37 publications

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“…In general, studies involving marshes focus on the characterization of salt or tidal marshes (Walsh et al, 2014;Fariña et al, 2017;Mcowen et al, 2017;Mao et al, 2018). These types of marsh have a grassy vegetation tolerant to salt water (Belluco et al, 2006;Judd et al, 2007) and have different water turbidity (Subramaniam and Saxena, 2011;Mondal and Bandyopadhyay, 2014) and soil types (Mao et al, 2018) in comparison with inner marshes. para clasificar estos ecosistemas.…”

Section: Introductionmentioning

confidence: 99%

Small inner marsh area delimitation using remote sensing spectral indexes and decision tree method in southern Brazil

et al. 2018

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<p>Vast small inner marsh (SIM) areas have been lost in the past few decades through the conversion to agricultural, urban and industrial lands. The remaining marshes face several threats such as drainage for agriculture, construction of roads and port facilities, waste disposal, among others. This study integrates 17 remote sensing spectral indexes and decision tree (DT) method to map SIM areas using Sentinel 2A images from Summer and Winter seasons. Our results showed that remote sensing indexes, although not developed specifically for wetland delimitation, presented satisfactory results in order to classify these ecosystems. The indexes that showed to be more useful for marshes classification by DT techniques in the study area were NDTI, BI, NDPI and BI_2, with 25.9%, 17.7%, 11.1% and 0.8%, respectively. In general, the Proportion Correct (PC) found was 95.9% and 77.9% for the Summer and Winter images respectively. We hypothetize that this significant PC variation is related to the rice-planting period in the Summer and/or to the water level oscillation period in the Winter. For future studies, we recommend the use of active remote sensors (e.g., radar) and soil maps in addition to the remote sensing spectral indexes in order to obtain better results in the delimitation of small inner marsh areas.</p>

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Section: Introductionmentioning

confidence: 99%

Small inner marsh area delimitation using remote sensing spectral indexes and decision tree method in southern Brazil

et al. 2018

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“…providing OM as a nucleus and binding agent or by root growth and root exudation (Six et al, 2002b). Therefore, the decreasing aboveground plant biomass and general changes in plant species composition with increasing salinity might also affect aggregation along the estuary (Mao et al, 2018; Liu et al, 2021). The high amounts of C fPOM in the freshwater marsh and its decreasing trend downstream of the estuary with increasing salinity is strongly linked to the local aboveground plant biomass.…”

Section: Discussionmentioning

confidence: 99%

“…Besides soil texture, the soil water content and dry-wet cycles are controlling aggregate dynamics and associated OM turnover in soil (Six et al, 2002b; Six et al, 2004; Najera et al, 2020). Aggregate formation and stability in soil can decrease with increasing flooding intensity and increasing soil water content in strongly flood-effected soils (Mao et al, 2018; Liu et al, 2021; Ran et al, 2021). This indicates that the conditions in the less inundated high marshes favor aggregation.…”

Section: Discussionmentioning

confidence: 99%

Soil organic carbon stocks and stabilization mechanisms in tidal marshes along estuarine gradients

Neiske,

Seedtke,

Eschenbach

et al. 2024

Preprint

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Coastal wetlands store large amounts of soil organic carbon (SOC), however, little is known on SOC stabilization mechanisms (e.g. aggregation or mineral-association) in these ecosystems. In estuarine marshes, SOC storage is dominated by a complex interaction of abiotic conditions such as tidal inundation or salinity with biotic ecosystem components, leading to strong spatio-temporal variations within and between estuaries. Our aim was to assess (i) SOC stocks, (ii) SOC stabilization mechanisms, and (iii) their environmental drivers along estuarine gradients. We analyzed topsoil (0-10 cm) and subsoil (10-30 cm) samples from three marsh zones representing three flooding regimes (daily, monthly, yearly) in three marsh types along the salinity gradient (salt, brackish, freshwater) of the Elbe Estuary, Germany. Total SOC stocks, as well as SOC density fractions were analyzed and related to site characteristics (soil texture, soil pH, redox conditions, aboveground plant biomass). Increasing salinity and flooding frequency negatively affected SOC stocks in 0-30 cm (9.3-74.6 t ha-1). This was related to plant biomass and soil texture along the estuary. Mineral-associated OC (CMAOM) was the largest SOC fraction (59% of total SOC), followed by OC in aggregates (CoPOM) (24%) and OC in free particulate organic matter (CfPOM) (16%). The CMAOM amount in topsoils decreased downstream with increasing salinity, reflecting decreasing fine-texture along the estuary. The amount of CoPOM was higher in topsoils and less flood-affected marshes, indicating negative effects of flooding on aggregation. The relative proportion of CfPOM to total SOC increased with increasing flooding frequency and correlated positively with reducing soil conditions but not with the local plant biomass. Our results underline the importance of estuarine gradients as drivers of SOC storage and stabilization. Climate-change induced sea-level rise and variations in salinity might threaten SOC stocks and hamper SOC stabilization in estuarine soils.

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“…It is also the basic condition for crop growth, development, high yield and stable yield (Wang et al 2014, Chaplot andCooper 2015). Therefore, the composition and stability of soil WSA can be used to measure the degree of soil structural development and sustainable utilization (Mao et al 2018, Li et al 2019. The MWD is a common method to evaluate the characteristics and stability of soil aggregates.…”

Section: Introductionmentioning

confidence: 99%

Distribution characteristics and stability of soil aggregates as compounded by soft rock and sand under different planting years of corn in Mu Us sandy land in China

Zhang¹,

Guo

Shi

et al. 2021

Bangladesh J. Bot.

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Field plot experiments of compound soil mixing with soft rock and sand with ratios of 1 : 1, 1 : 2 and 1 : 5 during 2010-2018 years of corn cultivation in Mu Us Sandy Land in china., was carried out to observe the change characteristics of composition, distribution and mean weight diameter (MWD) of compound soil water stable aggregate (WSA) under different corn planting years. The results showed that with the increase of planting years, the content of WSA in composite soils of three portions with a particle size of < 0.25 mm gradually decreased, and WSA with a particle size of > 0.25 mm showed a continuous increasing trend. The WSA with a particle size of 0.25 - 0.5 mm accounted high for the maximum ratio, which plays an important role in the agglomeration of the compound soil. After 9 years of planting, the MWD of 1 : 1, 1 : 2 and 1 : 5 compound soil WSA increased by 1.13, 1.85 and 1.58 times, respectively, and t 1:2 compound soil WSA with particle size > 0.25 mm and MWD increase at a faster rate, which lead to a higher soil agglomeration and stability. The interaction between the mixture ratio of soft rock to sand and the planting years of corn has a significant impact on the formation and stability of WSA in the compound soil. With the increase of planting years of corn, the agglomeration effect of compound soil in different proportions was found to enhance, and the development of soil structure improve continuously. Bangladesh J. Bot. 50(3): 917-923, 2021 (September) Special

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Soil‐Aggregate‐Associated Organic Carbon Along Vegetation Zones in Tidal Salt Marshes in the Liaohe Delta

Cited by 8 publications

References 37 publications

Small inner marsh area delimitation using remote sensing spectral indexes and decision tree method in southern Brazil

Small inner marsh area delimitation using remote sensing spectral indexes and decision tree method in southern Brazil

Soil organic carbon stocks and stabilization mechanisms in tidal marshes along estuarine gradients

Distribution characteristics and stability of soil aggregates as compounded by soft rock and sand under different planting years of corn in Mu Us sandy land in China

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