Effect of wetting intensity on soil GHG fluxes and microbial biomass under a temperate forest floor during dry season

Geoderma ◽  
2012 ◽  
Vol 170 ◽  
pp. 118-126 ◽  
Author(s):  
Xingkai Xu ◽  
Xianbao Luo
Keyword(s):  
Microbial Biomass ◽  
Forest Floor ◽  
Temperate Forest ◽  
Dry Season ◽  
Ghg Fluxes

Factors limiting microbial biomass in the mineral soil and forest floor of a warm-temperate forest

1994 ◽  
Vol 26 (10) ◽  
pp. 1409-1415 ◽  
Author(s):  
Antonio Gallardo ◽  
William H. Schlesinger
Keyword(s):  
Microbial Biomass ◽  
Forest Floor ◽  
Temperate Forest ◽  
Mineral Soil ◽  
Warm Temperate Forest ◽  
Warm Temperate

scholarly journals Eastern Red-backed Salamanders Regulate Top-Down Effects in a Temperate Forest-Floor Community

Herpetologica ◽  
2017 ◽  
Vol 73 (3) ◽  
pp. 180-189 ◽  
Author(s):  
Cari-Ann M. Hickerson ◽  
Carl D. Anthony ◽  
B. Michael Walton
Keyword(s):  
Forest Floor ◽  
Temperate Forest ◽  
Top Down

scholarly journals Eastern Red-backed Salamanders Regulate Top-Down Effects in a Temperate Forest-Floor Community

Herpetologica ◽  
2017 ◽  
Author(s):  
Cari-Ann M. Hickerson ◽  
Carl D. Anthony ◽  
B. Michael Walton
Keyword(s):  
Forest Floor ◽  
Temperate Forest ◽  
Top Down

scholarly journals Contribution of fine tree roots to the silicon cycle in a temperate forest ecosystem developed on three soil types

2018 ◽  
Vol 15 (7) ◽  
pp. 2231-2249 ◽  
Author(s):  
Marie-Pierre Turpault ◽  
Christophe Calvaruso ◽  
Gil Kirchen ◽  
Paul-Olivier Redon ◽  
Carine Cochet
Keyword(s):  
Seasonal Dynamics ◽  
Forest Floor ◽  
Fine Roots ◽  
Temperate Forest ◽  
Forest Ecosystems ◽  
Soil Layer ◽  
Soil Types ◽  
Root Decomposition ◽  
Soil Layers

Abstract. The role of forest vegetation in the silicon (Si) cycle has been widely examined. However, to date, little is known about the specific role of fine roots. The main objective of our study was to assess the influence of fine roots on the Si cycle in a temperate forest in north-eastern France. Silicon pools and fluxes in vegetal solid and solution phases were quantified within each ecosystem compartment, i.e. in the atmosphere, above-ground and below-ground tree tissues, forest floor and different soil layers, on three plots, each with different soil types, i.e. Dystric Cambisol (DC), Eutric Cambisol (EC) and Rendzic Leptosol (RL). In this study, we took advantage of a natural soil gradient, from shallow calcic soil to deep moderately acidic soil, with similar climates, atmospheric depositions, species compositions and management. Soil solutions were measured monthly for 4 years to study the seasonal dynamics of Si fluxes. A budget of dissolved Si (DSi) was also determined for the forest floor and soil layers. Our study highlighted the major role of fine roots in the Si cycle in forest ecosystems for all soil types. Due to the abundance of fine roots mainly in the superficial soil layers, their high Si concentration (equivalent to that of leaves and 2 orders higher than that of coarse roots) and their rapid turnover rate (approximately 1 year), the mean annual Si fluxes in fine roots in the three plots were 68 and 110 kgha-1yr-1 for the RL and the DC, respectively. The turnover rates of fine roots and leaves were approximately 71 and 28 % of the total Si taken up by trees each year, demonstrating the importance of biological recycling in the Si cycle in forests. Less than 1 % of the Si taken up by trees each year accumulated in the perennial tissues. This study also demonstrated the influence of soil type on the concentration of Si in the annual tissues and therefore on the Si fluxes in forests. The concentrations of Si in leaves and fine roots were approximately 1.5–2.0 times higher in the Si-rich DC compared to the Si-poor RL. In terms of the DSi budget, DSi production was large in the three plots in the forest floor (9.9 to 12.7 kgha-1yr-1), as well as in the superficial soil layer (5.3 to 14.5 kgha-1yr-1), and decreased with soil depth. An immobilization of DSi was even observed at 90 cm depth in plot DC (−1.7 kgha-1yr-1). The amount of Si leached from the soil profile was relatively low compared to the annual uptake by trees (13 % in plot DC to 29 % in plot RL). The monthly measurements demonstrated that the seasonal dynamics of the DSi budget were mainly linked to biological activity. Notably, the peak of dissolved Si production in the superficial soil layer occurred during winter and probably resulted from fine-root decomposition. Our study reveals that biological processes, particularly those involving fine roots, play a predominant role in the Si cycle in temperate forest ecosystems, while the geochemical processes appear to be limited.

Rainfall manipulation effects on litter decomposition and the microbial biomass of the forest floor

2003 ◽  
Vol 22 (3) ◽  
pp. 271-281 ◽  
Author(s):  
Eric F Salamanca ◽  
Nobuhiro Kaneko ◽  
Shigeo Katagiri
Keyword(s):  
Microbial Biomass ◽  
Litter Decomposition ◽  
Forest Floor

scholarly journals Microclimatic and ecophysiological conditions experienced by epiphytic bryophytes in an Amazonian rain forest

2019 ◽  
Author(s):  
Nina Löbs ◽  
David Walter ◽  
Cybelli G. G. Barbosa ◽  
Sebastian Brill ◽  
Gabriela R. Cerqueira ◽  
...  
Keyword(s):  
Rain Forest ◽  
Forest Floor ◽  
Dark Respiration ◽  
Physiological Activity ◽  
Dry Season ◽  
Photon Flux ◽  
Monthly Average ◽  
Light Intensities ◽  
Amazonian Rain Forest ◽  
Water Contents

Abstract. In the Amazonian rain forest, major parts of trees and shrubs are covered by epiphytic cryptogams of great taxonomic variety, but their relevance in biosphere-atmosphere exchange, climate processes, and nutrient cycling are largely unknown. As cryptogams are poikilohydric organisms, they are physiologically active only under moist conditions. Thus, information on their water content, as well as temperature and light conditions experienced by them are essential to analyzing their impact on local, regional, and even global biogeochemical processes. In this study, we present data on the microclimatic and ecophysiological conditions of epiphytic bryo-phytes along a vertical gradient and combine these with mesoclimate data collected at the Amazon Tall Tower Observatory (ATTO) in the Amazonian rain forest between October 2014 and December 2016. While the monthly average mesoclimatic ambient light intensities above the canopy revealed only minor variations, the light intensities incident on the bryophytes showed different patterns at different heights, probably depending on individual shading by vegetation. At 1.5 m height, monthly average light intensities were similar throughout the year and individual values were extremely low, exceeding 5 µmol m−2 s−1 pho-tosynthetic photon flux density only during 8 % of the time. Temperatures showed only minor variations throughout the year with higher values and larger height-dependent differences during the dry season. Water contents of bryophytes varied depending on precipitation and air humidity. Whereas bryophytes at higher levels were affected by frequent wetting and drying events, those close to the forest floor remained wet over longer time spans during the wet seasons. Based on estimates of the potential duration of net pho-tosynthesis and dark respiration, our data suggest that water contents are decisive for overall physiological activity, and light intensities determine whether net photosynthesis or dark respiration occurs, whereas temperature variations are only of minor relevance in this environment. In general, bryophytes growing close to the forest floor are limited by light availability, while those growing in the canopy must withstand larger variations in microclimatic conditions, especially in the dry season. Measurements of CO2 gas ex-change are essential to elucidate their physiological activity patterns in greater detail.

Conserving US temperate forest plant diversity: a case example with forest-floor Aristolochiaceae

2014 ◽  
Vol 15 (3) ◽  
pp. 236-246 ◽  
Author(s):  
T. Luna
Keyword(s):  
Plant Diversity ◽  
Forest Floor ◽  
Temperate Forest
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