Plant uptake of organic nitrogen in two peatlands

2018 ◽  
Vol 433 (1-2) ◽  
pp. 391-400 ◽  
Author(s):  
Tim R. Moore ◽  
Amanda Alfonso ◽  
Beverley R. Clarkson
Keyword(s):  
Plant Uptake ◽  
Organic Nitrogen

scholarly journals Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems

2013 ◽  
Vol 10 (12) ◽  
pp. 7943-7955 ◽  
Author(s):  
Q. Zhu ◽  
Q. Zhuang
Keyword(s):  
Boreal Forest ◽  
Carbon Cycling ◽  
Nitrogen Uptake ◽  
Plant Uptake ◽  
Boreal Forests ◽  
Organic Nitrogen ◽  
Tundra Ecosystem ◽  
Ecosystem Production ◽  
Tundra Ecosystems ◽  
Organic Nitrogen Uptake

Abstract. Boreal forest and tundra are the major ecosystems in the northern high latitudes in which a large amount of carbon is stored. These ecosystems are nitrogen-limited due to slow mineralization rate of the soil organic nitrogen. Recently, abundant field studies have found that organic nitrogen is another important nitrogen supply for boreal forest and tundra ecosystems. In this study, we incorporated a mechanism that allowed boreal plants to uptake small molecular amino acids into a process-based biogeochemical model, the Terrestrial Ecosystem Model (TEM), to evaluate the impact of organic nitrogen uptake on ecosystem carbon cycling. The new version of the model was evaluated for both boreal forest and tundra sites. We found that the modeled organic nitrogen uptake accounted for 36–87% of total nitrogen uptake by plants in tundra ecosystems and 26–50% for boreal forests, suggesting that tundra ecosystem might have more relied on the organic form of nitrogen than boreal forests. The simulated monthly gross ecosystem production (GPP) and net ecosystem production (NEP) tended to be larger with the new version of the model since the plant uptake of organic nitrogen alleviated the soil nitrogen limitation especially during the growing season. The sensitivity study indicated that the most important factors controlling the plant uptake of organic nitrogen was the soil amino acid diffusion coefficient (De) in our model, suggesting that the organic nitrogen uptake by plants is likely to be regulated by the edaphic characteristics of diffusion. The model uncertainty due to uncertain parameters associated with organic nitrogen uptake of the tundra ecosystem was larger than the boreal forest ecosystems. This study suggests that considering the organic nitrogen uptake by plants is important to carbon modeling of boreal forest and tundra ecosystems.

scholarly journals Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal ecosystems

2013 ◽  
Vol 10 (8) ◽  
pp. 13455-13490 ◽  
Author(s):  
Q. Zhu ◽  
Q. Zhuang
Keyword(s):  
Boreal Forest ◽  
Nitrogen Uptake ◽  
Plant Uptake ◽  
Boreal Forests ◽  
Organic Nitrogen ◽  
Boreal Ecosystems ◽  
Ecosystem Carbon ◽  
Tundra Ecosystem ◽  
Ecosystem Production ◽  
Organic Nitrogen Uptake

Abstract. Boreal forest and tundra are the major ecosystems in the northern high latitudes in which a large amount of carbon is stored. These ecosystems are nitrogen-limited due to slow mineralization rate of the soil organic nitrogen. Recently, abundant field studies have found that organic nitrogen is another important nitrogen supply for boreal ecosystems. In this study, we incorporated a mechanism that allowed boreal plants to uptake small molecular amino acids into a process-based biogeochemical model, the Terrestrial Ecosystem Model (TEM), to evaluate the impact of organic nitrogen uptake on ecosystem carbon cycling. The new version of the model was evaluated at both boreal forest and tundra sites. We found that the modeled organic nitrogen uptake accounted for 36–87% of total nitrogen uptake by plants in tundra ecosystems and 26–50% for boreal forests, suggesting that tundra ecosystem might have more relied on the organic form of nitrogen than boreal forests. The simulated monthly gross ecosystem production (GPP) and net ecosystem production (NEP) tended to be larger with the new version of the model since the plant uptake of organic nitrogen alleviated the soil nitrogen limitation especially during the growing season. The sensitivity study indicated that the most important factors controlling the plant uptake of organic nitrogen were the maximum root uptake rate (Imax) and the radius of the root (r0) in our model. The model uncertainty due to uncertain parameters associated with organic nitrogen uptake at tundra ecosystem was larger than at boreal forest ecosystems. This study suggests that considering the organic nitrogen uptake by plants is important to boreal ecosystem carbon modeling.

PLANT UPTAKE OF INORGANIC AND ORGANIC NITROGEN: NEIGHBOR IDENTITY MATTERS

Ecology ◽  
2007 ◽  
Vol 88 (7) ◽  
pp. 1832-1840 ◽  
Author(s):  
Amy E. Miller ◽  
William D. Bowman ◽  
Katharine Nash Suding
Keyword(s):  
Plant Uptake ◽  
Organic Nitrogen ◽  
Inorganic And Organic Nitrogen ◽  
Inorganic And Organic

Ferrihydrite dissolution at the root zone of crops under semi-arid condition controls the plant uptake of uranium and arsenic

2020 ◽  
Author(s):  
Arindam Malakar ◽  
Michael Kaiser ◽  
Daniel D. Snow ◽  
Harkamal Walia ◽  
Chittaranjan Ray
Keyword(s):  
Plant Uptake ◽  
Root Zone ◽  
Arid Condition ◽  
Semi Arid
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