scholarly journals Iron-mediated soil carbon response to water-table decline in an alpine wetland

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Yiyun Wang ◽  
Hao Wang ◽  
Jin-Sheng He ◽  
Xiaojuan Feng
Keyword(s):  
Soil Carbon ◽  
Water Table ◽  
Alpine Wetland ◽  
Response To Water

Understanding wetland plant dynamics in response to water table changes through ecohydrological modelling

Ecohydrology ◽  
2012 ◽  
Vol 6 (2) ◽  
pp. 287-296 ◽  
Author(s):  
Bakkiyalakshmi Palanisamy ◽  
Ting Fong May Chui
Keyword(s):  
Water Table ◽  
Wetland Plant ◽  
Plant Dynamics ◽  
Response To Water

Effect of Water Table Depth on the Yield of Seven Sugarcane Varieties in Puerto Rico

1969 ◽  
Vol 60 (2) ◽  
pp. 228-237
Author(s):  
Raúl Pérez Escolar ◽  
William F. Allison
Keyword(s):  
Puerto Rico ◽  
Water Table ◽  
Commercial Production ◽  
Water Table Depth ◽  
Field Conditions ◽  
Sugarcane Varieties ◽  
Effect Of Water ◽  
Actual Field ◽  
Response To Water

The effect of water table depth on yield of sugarcane varieties PR 980, PR 1028, PR 1059, PR 1141, PR 64-610, PR 61-632 and PR 64-2705 was studied in lysimeter tanks in the field. Using plastic drains at varying distances and depths, variety PR 980 was studied on a 5-ha farm. Results obtained show that varieties differ in their response to water table conditions. Varieties PR 980, PR 1059, PR 64-610, PR 61-632 and PR 64-2705 yielded significantly more cane and sugar when the water table was lowered. Varieties PR 1028 and PR 1141 did not show statistically significant differences among treatment differentials. Under actual field conditions, using perforated plastic drains, variety PR 980 yielded significantly more sugar than in undrained plots. The results obtained in the lysimeter tanks are in accord with those observed under commercial production.

Banana Plant Response to Water Table Levels

1976 ◽  
Vol 19 (4) ◽  
pp. 0675-0677 ◽  
Author(s):  
Massood Ghavami
Keyword(s):  
Water Table ◽  
Plant Response ◽  
Banana Plant ◽  
Response To Water

Temporal Hyporheic Zone Response to Water Table Fluctuations

Ground Water ◽  
2015 ◽  
Vol 54 (2) ◽  
pp. 274-285 ◽  
Author(s):  
Jonathan M. Malzone ◽  
Sierra K. Anseeuw ◽  
Christopher S. Lowry ◽  
Richelle Allen-King
Keyword(s):  
Water Table ◽  
Hyporheic Zone ◽  
Water Table Fluctuations ◽  
Response To Water

scholarly journals Nitrogen Release in Pristine and Drained Peat Profiles in Response to Water Table Fluctuations: A Mesocosm Experiment

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Merjo P. P. Laine ◽  
Rauni Strömmer ◽  
Lauri Arvola
Keyword(s):  
Water Table ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Mesocosm Experiment ◽  
Nitrogen Release ◽  
Hydrological Conditions ◽  
Water Table Fluctuations ◽  
Drying And Rewetting ◽  
Response To Water ◽  
Artificial Water

In the northern hemisphere, variability in hydrological conditions was suggested to increase as a consequence of climate warming, which may result in longer droughts than the area has experienced before. Due to their predominately anoxic conditions, peatlands are expected to respond to changes in hydrological conditions, such as successive drying and rewetting periods. As peatlands are rich in organic matter, any major changes in water table may influence the decomposition of it. The hydrological conditions may also influence release of nutrients from peat profiles as well as affect their transport to downstream ecosystems. In our mesocosm experiment, artificial water table fluctuations in pristine peat profiles caused an increase in dissolved organic nitrogen (DON) and ammonium(NH4+-N)concentrations, while no response was found in drained peat profiles, although originating from the same peatland complex.

Evaluation of modelled methane emissions over high-latitude wetlands

2020 ◽  
Author(s):  
Yao Gao ◽  
Eleanor Burke ◽  
Sarah Chadburn ◽  
Maarit Raivonen ◽  
Timo Vesala ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Soil Carbon ◽  
Water Table ◽  
High Latitude ◽  
Land Surface ◽  
Water Table Depth ◽  
Surface Model ◽  
Emission Model ◽  
Earth System ◽  
Positive Feedbacks

<p>Atmospheric emissions and concentrations of CH<sub>4</sub> are continuing to increase, making CH<sub>4</sub> the second most important human-influenced greenhouse gas in terms of climate forcing, after CO<sub>2</sub>. Previous studies indicated that wetland CH<sub>4</sub> emission is not only the single largest but also the most uncertain natural source in the global CH<sub>4</sub> budget. Furthermore, the strong sensitivity of wetland CH<sub>4</sub> emissions to environmental conditions has raised concerns on potential positive feedbacks to climate change. Therefore, evaluation of the process-based land surface models of earth system models (ESMs) in simulating CH<sub>4</sub> emission over wetlands is needed for more precise future predictions. In this work, a set of high-latitude wetland sites with various nutrient conditions are studied. The wetland CH<sub>4</sub> fluxes are simulated by the land surface model JULES of the UK Earth System model and the Helsinki peatland methane emission model (HIMMELI), which is developed at Finnish Meteorological Institute and Helsinki University. The differences between the modelled and observed CH<sub>4</sub> fluxes are analyzed, complemented with key environmental variables for interpretation (e.g. soil temperature and moisture, vegetation types, snow depth, NPP, soil carbon). In general, the simulated CH<sub>4</sub> fluxes by HIMMELI is closer to the observed CH<sub>4</sub> fluxes in magnitude and seasonality at sites than those by JULES. The inter-annual variability of simulated CH<sub>4</sub> fluxes by HIMMELI depends on the simulated anoxic soil respiration, which serves as the substrate of the CH<sub>4</sub> fluxes in HIMMELI. The anoxic soil respiration is calculated based on the simulated soil respiration and water table depth in JULES. More accurate simulation of soil carbon pool and water table depth in JULES will lead to improvement in the simulated anoxic soil respiration.</p>

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