scholarly journals Decade-long soil nitrogen constraint on the CO2 fertilization of plant biomass

2012 ◽  
Vol 3 (3) ◽  
pp. 278-282 ◽  
Author(s):  
Peter B. Reich ◽  
Sarah E. Hobbie
Keyword(s):  
Soil Nitrogen ◽  
Plant Biomass ◽  
Co2 Fertilization

scholarly journals The response of Arctic vegetation and soils following an unusually severe tundra fire

2013 ◽  
Vol 368 (1624) ◽  
pp. 20120490 ◽  
Author(s):  
M. Syndonia Bret-Harte ◽  
Michelle C. Mack ◽  
Gaius R. Shaver ◽  
Diane C. Huebner ◽  
Miriam Johnston ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Native Species ◽  
Vegetation Change ◽  
Nitrogen Availability ◽  
Net Primary Productivity ◽  
Plant Biomass ◽  
Vascular Plant ◽  
The Arctic ◽  
Soil Nitrogen Availability ◽  
Tussock Tundra

Fire causes dramatic short-term changes in vegetation and ecosystem function, and may promote rapid vegetation change by creating recruitment opportunities. Climate warming likely will increase the frequency of wildfire in the Arctic, where it is not common now. In 2007, the unusually severe Anaktuvuk River fire burned 1039 km 2 of tundra on Alaska's North Slope. Four years later, we harvested plant biomass and soils across a gradient of burn severity, to assess recovery. In burned areas, above-ground net primary productivity of vascular plants equalled that in unburned areas, though total live biomass was less. Graminoid biomass had recovered to unburned levels, but shrubs had not. Virtually all vascular plant biomass had resprouted from surviving underground parts; no non-native species were seen. However, bryophytes were mostly disturbance-adapted species, and non-vascular biomass had recovered less than vascular plant biomass. Soil nitrogen availability did not differ between burned and unburned sites. Graminoids showed allocation changes consistent with nitrogen stress. These patterns are similar to those seen following other, smaller tundra fires. Soil nitrogen limitation and the persistence of resprouters will likely lead to recovery of mixed shrub–sedge tussock tundra, unless permafrost thaws, as climate warms, more extensively than has yet occurred.

scholarly journals Relationship between Remote Sensing Data, Plant Biomass and Soil Nitrogen Dynamics in Intensively Managed Grasslands under Controlled Conditions

Sensors ◽  
2017 ◽  
Vol 17 (7) ◽  
pp. 1483 ◽  
Author(s):  
Christoph Knoblauch ◽  
Conor Watson ◽  
Clara Berendonk ◽  
Rolf Becker ◽  
Nicole Wrage-Mönnig ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Soil Nitrogen ◽  
Plant Biomass ◽  
Remote Sensing Data ◽  
Nitrogen Dynamics ◽  
Sensing Data ◽  
Soil Nitrogen Dynamics ◽  
Controlled Conditions ◽  
Intensively Managed

scholarly journals Plant-soil nitrogen, carbon and phosphorus content after the addition of biochar, bacterial inoculums and N fertilizer

2020 ◽  
Author(s):  
Irina Mikajlo ◽  
Bertrand Pourrut ◽  
Brice Louvel ◽  
Jaroslav Hynšt ◽  
Jaroslav Záhora
Keyword(s):  
Soil Nitrogen ◽  
Aboveground Biomass ◽  
Phosphorus Content ◽  
Plant Biomass ◽  
Beech Wood ◽  
N Fertilizer ◽  
Total N ◽  
Plant Soil ◽  
P Content ◽  
South Moravia

AbstractThe use of biochar in combination with mineral or biological amendments in order to improve its influence on soil-plant properties has received growing attention. The changes of N, C and P content in Lactuca sativa var. capitata aboveground plant biomass and soil after the addition of beech wood biochar combined with the addition of bacterial inoculums (Bacofil and Novarefm) and N fertilizer have been studied using spectrophotometry methods. Pots were filled with the arable soil from the plots in protection zone of water sources (Březová nad Svitavou, South Moravia, Czech Republic). Biochar with inoculums decreased plant growth in the first yield of Novaferm treatment and in both yields of Bactofil treatment. Increased plant biomass growth was observed with Novaferm addition in the second yield. Total N increase has been obtained in the plant aboveground biomass and soil of the treatments amended with inoculums and nitrogen fertilizer. The decrease of P content has been observed in plant aboveground biomass in the biochar amended samples.

The variable effects of soil nitrogen availability and insect herbivory on aboveground and belowground plant biomass in an old-field ecosystem

Oecologia ◽  
2011 ◽  
Vol 167 (3) ◽  
pp. 771-780 ◽  
Author(s):  
Jarrod D. Blue ◽  
Lara Souza ◽  
Aimée T. Classen ◽  
Jennifer A. Schweitzer ◽  
Nathan J. Sanders
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Availability ◽  
Plant Biomass ◽  
Insect Herbivory ◽  
Old Field ◽  
Soil Nitrogen Availability ◽  
Field Ecosystem ◽  
Belowground Plant Biomass

scholarly journals Author Correction: Nitrogen and phosphorus constrain the CO2 fertilization of global plant biomass

2020 ◽  
Vol 10 (7) ◽  
pp. 696-697
Author(s):  
César Terrer ◽  
Robert B. Jackson ◽  
I. Colin Prentice ◽  
Trevor F. Keenan ◽  
Christina Kaiser ◽  
...  
Keyword(s):  
Plant Biomass ◽  
Nitrogen And Phosphorus ◽  
Co2 Fertilization

scholarly journals Nitrogen and phosphorus constrain the CO2 fertilization of global plant biomass

2019 ◽  
Vol 9 (9) ◽  
pp. 684-689 ◽  
Author(s):  
César Terrer ◽  
Robert B. Jackson ◽  
I. Colin Prentice ◽  
Trevor F. Keenan ◽  
Christina Kaiser ◽  
...  
Keyword(s):  
Plant Biomass ◽  
Nitrogen And Phosphorus ◽  
Co2 Fertilization

Effects of density and soil nitrogen levels on growth of Galinsoga quadriradiata and G. parviflora in pure and mixed stands

1986 ◽  
Vol 64 (11) ◽  
pp. 2708-2715 ◽  
Author(s):  
J. P. N. Rai ◽  
R. S. Tripathi
Keyword(s):  
Population Density ◽  
Soil Nitrogen ◽  
Reproductive Effort ◽  
Plant Biomass ◽  
Northeast India ◽  
Nitrogen Level ◽  
Mixed Stands ◽  
Nitrogen Levels ◽  
Annual Weeds ◽  
Successional Communities

The responses of two sympatric annual weeds, Galinsoga quadriradiata Ruiz & Pavon (G. ciliata (Raf.) Blake) and G. parviflora Cav., which occur abundantly in croplands and early secondary successional communities of hill regions in northeast India, were studied in relation to population density, soil nitrogen, and nature of the stand (pure versus mixed stands). Both weeds exhibited density-dependent mortality which increased at a higher nitrogen level. In the case of G. quadriradiata more individuals survived in a mixture than in monoculture, whereas G. parviflora showed the reverse trend. Growth of both weeds was better at a higher soil nitrogen level. Increased mortality and suppression of growth caused by an increase in density was also minimized in G. quadriradiata at the higher level of soil nitrogen. With an increase in population density, per-plant biomass and capitula production in both weeds showed an increase in positive skewness which, however, decreased at an increased nitrogen level. Galinsoga quadriradiata was less sensitive to density than G. parviflora regardless of soil nitrogen. At lower densities, both weeds grew better in a mixture than in pure stands, but at higher densities G. quadriradiata suppressed the growth of G. parviflora. Although the crude reproductive effort of the two weeds was independent of soil nitrogen, G. quadriradiata, in contrast to G. parviflora, exhibited a greater crude reproductive effort when grown either at higher densities or in a mixture.

scholarly journals Effect of Water Stress in Soil Nitrogen Dynamics under Intercropping System with Maize and Sorghum

2018 ◽  
Vol 15 ◽  
pp. 1-12
Author(s):  
Asim Sharif ◽  
Utsab Thapa
Keyword(s):  
Water Stress ◽  
Nitrogen Content ◽  
Soil Nitrogen ◽  
Plant Biomass ◽  
Soil Aggregates ◽  
Biotic Interactions ◽  
Agroforestry Systems ◽  
Nitrogen Allocation ◽  
Aggregate Fraction ◽  
Plant Mixture

Global warming, one of the most persistent threats to nature, is expected to result in severe droughts in many parts of the world. Droughts are supposed to effect individual plants and/or plant communities by changing their a/ biotic interactions. The objective of this study was to elucidate drought effects on soil nitrogen allocation in different aggregate sizes. This was done by growing Zea mays and Sorghum bicolor in monoculture and mixture. Nitrogen allocation under drought stress was traced using nitrogen stable isotope 15N. Drought disintegrated soil aggregates into finer aggregates for sorghum monoculture and decreased the aggregate proportion in small macro-aggregate fraction for maize monoculture. For plant mixture, drought increased total nitrogen content in micro-aggregate fraction and uptake of added 15N in bulk soil. Hence, the study showed that mix planting maize and sorghum offer better resistance against changes in plant biomass and nitrogen content which suggests its effectiveness in nitrogen conservation during water stress. Moreover, intergrowing maize and sorghum under agroforestry systems also produce advantageous results.

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