Seasonal patterns of daily net photosynthesis, transpiration and net primary productivity of Juncus roemerianus and Spartina alterniflora in a Georgia salt marsh

Oecologia ◽  
1982 ◽  
Vol 52 (3) ◽  
pp. 404-410 ◽  
Author(s):  
J. R. Giurgevich ◽  
E. L. Dunn
Keyword(s):  
Salt Marsh ◽  
Spartina Alterniflora ◽  
Primary Productivity ◽  
Net Primary Productivity ◽  
Net Photosynthesis ◽  
Juncus Roemerianus ◽  
Seasonal Patterns

Aboveground biomass and seasonal patterns of aboveground net primary productivity in five bamboo species in northern Laos

2019 ◽  
Vol 13 (2) ◽  
pp. 150-156
Author(s):  
Singkone Xayalath ◽  
Isao Hirota ◽  
Shinsuke Tomita ◽  
Michiko Nakagawa
Keyword(s):  
Climate Change ◽  
Primary Productivity ◽  
Aboveground Biomass ◽  
Net Primary Productivity ◽  
Seasonal Patterns ◽  
Bamboo Species ◽  
Aboveground Net Primary Productivity ◽  
Sympatric Distribution ◽  
Carbon Sequestration Potential ◽  
Sequestration Potential

Abstract Aims Accurate estimates of bamboo biomass and net primary productivity (NPP) are required to evaluate the carbon sequestration potential of bamboo forests. However, relevant data that are important for climate change mitigation, have rarely been collected in regions outside of East Asia and India. Information on seasonal patterns of NPP and its components will enable the quantification of factors that influence the carbon balance in bamboo forests. In this study, we quantified the aboveground biomass (AGB) and aboveground NPP of five major bamboo species in northern Laos using monthly data collected over a 12-month period. Methods All live culms in 10, 2 m × 2 m plots (for one monopodial bamboo species: Indosasa sinica) and 30 clumps per species (for four sympodial bamboo species: Bambusa tulda, Cephalostachyum virgatum, Dendrocalamus membranaceus and Gigantochloa sp.) were numbered and measured at breast height. We set 10 or 20 litter traps per species to collect litterfall. Censuses of dead and recruited culms and litterfall collection were performed once per month for 12 months. Important Findings The AGB was highest in I. sinica (59.87 Mg ha−1) and lowest in C. virgatum (11.54 Mg ha−1), and was mostly below the plausible global range for bamboos (32–256 Mg ha−1). The sympatric distribution of multiple bamboo species at the study sites may have suppressed the AGB in four of the five studied species. The aboveground NPP estimates were between 3.43 and 14.25 Mg ha−1 yr−1; those for D. membranaceus (8.20 Mg ha−1 yr−1) and I. sinica (14.25 Mg ha−1 yr−1) were comparable to mean global estimates for temperate evergreen forests (8.78 Mg ha−1 yr−1) and tropical moist forests (10.56 Mg ha−1 yr−1). High culm recruitment rates (15.20–23.39% yr−1) were major contributors to aboveground NPP estimates. Seasonal patterns of aboveground NPP were largely influenced by the phenology of the new culms. In the four sympodial bamboo species, new culms began to emerge following the onset of persistent rainfall, mainly in July and August. However, the sprouting of new culms in the monopodial species I. sinica followed a trend of increasing temperatures, mainly in March and April. Thus, our results indicate that bamboos have considerable potential for sequestering carbon in northern Laos, but that this potential may be affected by climate change.

scholarly journals Annual net primary productivity of a cyanobacteria dominated biological soil crust in the Gulf savanna, Queensland, Australia

2017 ◽  
Author(s):  
Burkhard Büdel ◽  
Wendy J. Williams ◽  
Hans Reichenberger
Keyword(s):  
Gas Exchange ◽  
Primary Productivity ◽  
Net Primary Productivity ◽  
Heterotrophic Bacteria ◽  
Biological Soil Crust ◽  
Net Photosynthesis ◽  
Common Element ◽  
Carbon Gain ◽  
Active Period ◽  
Soil Crust

Abstract. Biological soil crusts are a common element of the Queensland (Australia) dry savannah ecosystem and are composed of cyanobacteria, algae, lichens, bryophytes, fungi and heterotrophic bacteria. Here we report on the annual net primary productivity of a cyanobacteria dominated biological soil crust form the Boodjamulla National Park in north western Queensland using a semi-automatic cuvette system. The dominating cyanobacteria are the filamentous species Sypmplocastrum purpurascens together with Scytonema sp. The recording period lasted from July 1st 2010 to June 30th 2011. Metabolic activity was found from November 2010 until mid-April 2011 only, referring to 23.6 % of the total time of the year. With the onset of the raining season in November, the first month of activity had a pronounced respiratory loss of CO2. Also the last month of the raining season had a negative CO2 balance. Of the metabolic active period, 48.6 % were net photosynthesis and 51.4 % dark respiration. Net photosynthetic uptake of CO2 during daylight was reduced at 32.6 % of the time by water suprasaturation during. In total, the biological soil crust fixed 229.09 mmol CO2 m−2 yr−1, referring to an annual carbon gain of 2.75 g m−2 yr−1. Due to malfunction of the automatic cuvette system, data from September and October 2010, together with days in November and December 2010 could not be analysed for net photosynthesis and respiration. Based on climatic and gas exchange data from November 2010, an estimated loss of 88 mmol CO2 m−2 was found for the two month, resulting in annual rates of 143.08 mmol CO2 m−2 yr−1, equivalent to a carbon gain of 1.72 g m−2 yr−1. The bulk net photosynthetic activity occurred above a relative humidity above 42 %, indicating a suitable climatic combination of temperature and water availability, and a light intensity well above 200 µmol photons m−2 s−1 photosynthetic active radiation. The Boodjamulla biocrust showed a highly seasonally varying CO2 gas exchange pattern divided into metabolically inactive winter month and active summer month. The metabolic active period starts with a period (up to 3 month) of carbon loss, probably due to regrowth before a four month period of carbon gain. This must be taken into consideration for future analyses and modelling of carbon balances in comparable biocrust ecosystems.

Aerial Production, Mortality, and Mineral Accumulation-Export Dynamics in Spartina Alterniflora and Juncus Roemerianus Plant Stands in a Georgia Salt Marsh

Ecology ◽  
1980 ◽  
Vol 61 (2) ◽  
pp. 303-312 ◽  
Author(s):  
John L. Gallagher ◽  
Robert J. Reimold ◽  
Rick A. Linthurst ◽  
William J. Pfeiffer
Keyword(s):  
Salt Marsh ◽  
Spartina Alterniflora ◽  
Juncus Roemerianus ◽  
Export Dynamics ◽  
Mineral Accumulation

Net Primary Productivity of Spartina densiflora Brong in an SW Atlantic Coastal Salt Marsh

2010 ◽  
Vol 33 (4) ◽  
pp. 953-962 ◽  
Author(s):  
Gabriela González Trilla ◽  
Silvia De Marco ◽  
Jorge Marcovecchio ◽  
Ricardo Vicari ◽  
Patricia Kandus
Keyword(s):  
Salt Marsh ◽  
Primary Productivity ◽  
Net Primary Productivity ◽  
Spartina Densiflora ◽  
Coastal Salt Marsh ◽  
Sw Atlantic ◽  
Atlantic Coastal
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