Carbon assimilation by riverine mangroves in the Florida Everglades

AbstractDespite enormous diversity, abundance and their role in ecosystem processes, little is known about how community structures of soil-inhabiting nematodes differ across elevation gradient. For this, soil nematode communities were investigated along an elevation gradient of 1000–2500 masl across a temperate vegetation in Banihal-Pass of Pir-Panjal mountain range. We aimed to determine how the elevation gradient affect the nematode community structure, diversity and contribution to belowground carbon assimilation in the form of metabolic footprint. Our results showed that total nematode abundance and the abundance of different trophic groups (fungivores, herbivores and omnivores) declined with the increase of elevation. Shannon index, generic richness and evenness index indicated that nematode communities were more diverse at lower elevations and declined significantly with increase in elevation. Nematode community showed a pattern of decline in overall metabolic footprint with the increase of elevation. Nematode abundance and diversity proved to be more sensitive to elevation induced changes as more abundant and diverse nematode assemblage are supported at lower elevations. Overall it appears nematode abundance, diversity and contribution to belowground carbon cycling is stronger at lower elevations and gradually keep declining towards higher elevations under temperate vegetation cover in Banihal-pass of Pir-Panjal mountain range.

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Lipids and their δ13C values reveal carbon assimilation and cycling in the methane-seep tubeworm Paraescarpia echinospica from the South China Sea

Deep Sea Research Part I Oceanographic Research Papers ◽

10.1016/j.dsr.2021.103556 ◽

2021 ◽

pp. 103556

Author(s):

Hongxiang Guan ◽

Daniel Birgel ◽

Dong Feng ◽

Jörn Peckmann ◽

Lei Liu ◽

...

Keyword(s):

South China Sea ◽

South China ◽

Carbon Assimilation ◽

The South China Sea ◽

Methane Seep ◽

The South ◽

Δ13c Values ◽

China Sea

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Altitude of origin influences stomatal conductance and therefore maximum assimilation rate in Southern Beech, Nothofagus cunninghamii

Functional Plant Biology ◽

10.1071/pp99164 ◽

2000 ◽

Vol 27 (5) ◽

pp. 451 ◽

Cited By ~ 6

Author(s):

Mark J. Hovenden ◽

Tim Brodribb

Keyword(s):

Stomatal Conductance ◽

Stomatal Density ◽

Carbon Assimilation ◽

Co2 Concentration ◽

Carboxylation Efficiency ◽

Assimilation Rate ◽

Carbon Assimilation Rate ◽

Southern Beech ◽

Maximum Stomatal Conductance ◽

Leaf Biochemistry

Gas exchange measurements were made on saplings of Southern Beech, Nothofagus cunninghamii (Hook.) Oerst. collected from three altitudes (350, 780 and 1100 m above sea level) and grown in a common glasshouse trial. Plants were grown from cuttings taken 2 years earlier from a number of plants at each altitude in Mt Field National Park, Tasmania. Stomatal density increased with increasing altitude of origin, and stomatal con-ductance and carbon assimilation rate were linearly related across all samples. The altitude of origin influenced thestomatal conductance and therefore carbon assimilation rate, with plants from 780 m having a greater photosynthetic rate than those from 350 m. The intercellular concentration of CO2 as a ratio of external CO2 concentration (ci/ca) was similar in all plants despite the large variation in maximum stomatal conductance. Carboxylation efficiency was greater in plants from 780 m than in plants from 350 m. Altitude of origin has a strong influence on the photo-synthetic performance of N. cunninghamii plants even when grown under controlled conditions, and this influence is expressed in both leaf biochemistry (carboxylation efficiency) and leaf morphology (stomatal density).

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