scholarly journals Effect of model root exudate on denitrifier community dynamics and activity at different water-filled pore space levels in a fertilised soil

2018 ◽  
Vol 120 ◽  
pp. 70-79 ◽  
Author(s):  
Adrian Langarica-Fuentes ◽  
Marta Manrubia ◽  
Madeline E. Giles ◽  
Susan Mitchell ◽  
Tim J. Daniell
Keyword(s):  
Root Exudate ◽  
Community Dynamics ◽  
Pore Space ◽  
Water Filled Pore Space

scholarly journals Methane emission by plant communities in an alpine meadow on the Qinghai-Tibetan Plateau: a new experimental study of alpine meadows and oat pasture

2009 ◽  
Vol 5 (4) ◽  
pp. 535-538 ◽  
Author(s):  
Shiping Wang ◽  
Xiaoxia Yang ◽  
Xingwu Lin ◽  
Yigang Hu ◽  
Caiyun Luo ◽  
...  
Keyword(s):  
Experimental Study ◽  
Soil Temperature ◽  
Plant Communities ◽  
Alpine Meadow ◽  
Pore Space ◽  
Bare Soil ◽  
Chemical Mechanism ◽  
Limited Evidence ◽  
Growing Seasons ◽  
Water Filled Pore Space

Recently, plant-derived methane (CH 4 ) emission has been questioned because limited evidence of the chemical mechanism has been identified to account for the process. We conducted an experiment with four treatments (i.e. winter-grazed, natural alpine meadow; naturally restored alpine meadow eight years after cultivation; oat pasture and bare soil without roots) during the growing seasons of 2007 and 2008 to examine the question of CH 4 emission by plant communities in the alpine meadow. Each treatment consumed CH 4 in closed, opaque chambers in the field, but two types of alpine meadow vegetation reduced CH 4 consumption compared with bare soil, whereas oat pasture increased consumption. This result could imply that meadow vegetation produces CH 4 . However, measurements of soil temperature and water content showed significant differences between vegetated and bare soil and appeared to explain differences in CH 4 production between treatments. Our study strongly suggests that the apparent CH 4 production by vegetation, when compared with bare soil in some previous studies, might represent differences in soil temperature and water-filled pore space and not the true vegetation sources of CH 4 .

Spatial variability of soil porosity under reduced tillage in a Humo-Ferric Podzol

1995 ◽  
Vol 75 (1) ◽  
pp. 149-152 ◽  
Author(s):  
M. R. Carter
Keyword(s):  
Bulk Density ◽  
Prince Edward Island ◽  
Pore Space ◽  
Soil Bulk Density ◽  
Soil Sampling ◽  
Moisture Regime ◽  
Humid Climate ◽  
Soil Moisture Regime ◽  
Classical Statistics ◽  
Water Filled Pore Space

The spatial and random variability of soil bulk density, water-filled pore space and macroporosity, which are important indices of soil physical quality in a humid soil moisture regime, were studied in soil samples taken from direct-drilled rotations at Charlottetown, Prince Edward Island. Classical statistics indicated variation was low for bulk density (CV = 3.0–5.8%) and water-filled pore space (CV = 7.4–10.3%), and medium (CV = 15.7–29.6%) for macropore volume. Spatial variation determined using variograms indicated some degree of spatial structure. The ability of variograms to divide sample variance into random and spatial components allows improved estimation of soil sampling size and spacing. Key words: Geostatistics, soil sampling, direct-drilling, humid climate

scholarly journals Soil atmosphere exchange of Carbonyl Sulfide (COS) regulated by diffusivity depending on water-filled pore space

2007 ◽  
Vol 4 (5) ◽  
pp. 3701-3722 ◽  
Author(s):  
H. Van Diest ◽  
J. Kesselmeier
Keyword(s):  
Air Temperature ◽  
Soil Structure ◽  
Pore Space ◽  
Carbonyl Sulfide ◽  
Gas Diffusion ◽  
Soil Types ◽  
Arable Soils ◽  
Deposition Velocities ◽  
Water Filled Pore Space

Abstract. The exchange of carbonyl sulfide (COS) between soil and the atmosphere was investigated for three arable soils from Germany, China and Finland and one forest soil from Siberia for parameterization in the relation to ambient carbonyl sulfide (COS) concentration, soil water content (WC) and air temperature. All investigated soils acted as significant sinks for COS. A clear and distinct uptake optimum was found for the German, Chinese, Finnish and Siberian soils at 11.5%, 9%, 11.5%, and 9% soil WC, respectively, indicating that the soil WC acts as an important biological and physical parameter for characterizing the exchange of COS between soils and the atmosphere. Different optima of deposition velocities (Vd) as observed for the Chinese, Finnish and Siberian boreal soil types in relation to their soil WC, aligned at 19% in relation to the water-filled pore space (WFPS), indicating the dominating role of gas diffusion. This interpretation was supported by the linear correlation between Vd and bulk density. We suggest that the uptake of COS depends on the diffusivity dominated by WFPS, a parameter depending on soil WC, soil structure and porosity of the soil.

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