Variability of dissolved organic carbon in precipitation during storms at the Shale Hills Critical Zone Observatory

Soil organic carbon (SOC) sequestration in aggregates under land use change have been widely concerned due to intimate impacts on the sink (or source) of atmospheric carbon dioxide (CO<sub>2</sub>). However, the quantitative relationship between soil aggregation and SOC sequestration under land uses change has been poorly studied. Distribution of aggregates, SOC contents in bulk soils and different size aggregates and their contributions to SOC sequestration were determined under different land uses in the Puding Karst Ecosystem Observation and Research Station, karst Critical Zone Observatory (CZO), Southwest China. Soil aggregation and SOC sequestration increased in the processes of farmland abandonment and recovery. SOC contents in micro-aggregates were larger than those in macro-aggregates in restored land soils, while the opposite results in farmland soils were obtained, probably due to the hindrance of the C-enriched SOC transport from macro-aggregate into micro-aggregate by the disturbance of agricultural activities. SOC contents in macro-aggregates exponentially increased with their proportions along successional land uses. Macro-aggregates accounted for over 80% on the SOC sequestration in restored land soils, while they accounted for 31–60% in farmland soils. These results indicated that macro-aggregates have a great potential for SOC sequestration in karst soils.

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Spatiotemporal Patterns of Water Stable Isotope Compositions at the Shale Hills Critical Zone Observatory: Linkages to Subsurface Hydrologic Processes

Vadose Zone Journal ◽

10.2136/vzj2013.01.0029 ◽

2013 ◽

Vol 12 (4) ◽

pp. vzj2013.01.0029 ◽

Cited By ~ 50

Author(s):

Evan M. Thomas ◽

Henry Lin ◽

Christopher J. Duffy ◽

Pamela L. Sullivan ◽

George H. Holmes ◽

...

Keyword(s):

Stable Isotope ◽

Critical Zone ◽

Spatiotemporal Patterns ◽

Hydrologic Processes ◽

Critical Zone Observatory ◽

Water Stable Isotope ◽

Shale Hills

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Hot Spots and Hot Moments of Dissolved Organic Carbon Export and Soil Organic Carbon Storage in the Shale Hills Catchment

Vadose Zone Journal ◽

10.2136/vzj2010.0149 ◽

2011 ◽

Vol 10 (3) ◽

pp. 943-954 ◽

Cited By ~ 75

Author(s):

Danielle M. Andrews ◽

Henry Lin ◽

Qing Zhu ◽

Lixin Jin ◽

Susan L. Brantley

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Dissolved Organic Carbon ◽

Carbon Storage ◽

Hot Spots ◽

Carbon Export ◽

Soil Organic Carbon Storage ◽

Organic Carbon Storage ◽

Shale Hills

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Regolith production and transport at the Susquehanna Shale Hills Critical Zone Observatory, Part 2: Insights from meteoric10Be

Journal of Geophysical Research Earth Surface ◽

10.1002/jgrf.20121 ◽

2013 ◽

Vol 118 (3) ◽

pp. 1877-1896 ◽

Cited By ~ 64

Author(s):

Nicole West ◽

Eric Kirby ◽

Paul Bierman ◽

Rudy Slingerland ◽

Lin Ma ◽

...

Keyword(s):

Critical Zone ◽

Critical Zone Observatory ◽

Shale Hills

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Geochemical Characteristics of Rare Earth Elements in Soils from Puding Karst Critical Zone Observatory, Southwest China

Sustainability ◽

10.3390/su11184963 ◽

2019 ◽

Vol 11 (18) ◽

pp. 4963 ◽

Cited By ~ 7

Author(s):

Qian Zhang ◽

Guilin Han ◽

Man Liu ◽

Lingqing Wang

Keyword(s):

Rare Earth ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Rare Earth Elements ◽

Southwest China ◽

Clay Content ◽

Critical Zone ◽

Fe Content ◽

Local Soil ◽

Critical Zone Observatory

Soil samples from eight soil profiles under different land-use types were collected at the Puding Karst Critical Zone Observatory, Southwest China, to investigate the distribution, fractionation, and controlling factors of rare earth elements (REEs). The total REEs contents in topsoil ranged from 149.97 to 247.74 mg kg−1, the contents in most topsoil were higher than local soil background value (202.60 mg kg−1), and the highest content was observed in topsoil under cropland. The REEs contents in surface soils from lower slopes sites were higher than that of middle and upper slope sites, and the highest contents were observed in cropland. The PAAS-normalized REEs pattern in soils showed MREEs significantly enriched relative to LREEs and HREEs, and HREEs were enriched relative to LREEs. The results showed that clay content, pH, soil organic carbon, total phosphorus, and Fe content were the main factors influencing the distribution of REEs in karst soils, and soil organic carbon (SOC), Fe content showed better linear relationship with REEs.

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