Now showing items 1-10 of 11
Turnover of microbial biomass, plant residues and soil humic constituents under field conditions
Contributor:McGill, W. B.; Paul, Eldor A.
The effects of soil texture and climatic conditions on turnover rates of plant residues were measured under field conditions. Carbon-14- and 15N-labelled straw made it possible to follow degradation rates of the original ...
Evapotranspiration in the tropics
Contributor:Schulz, Edmond F.; Hossain, Aolad
A study was made of monthly rainfall and runoff over a 105,000 square kilometer watershed in northern Thailand. The function of the watershed in producing the runoff hydrograph was simulated using a type of Stanford Watershed ...
Conversion of biovolume measurements of soil organisms, grown under various moisture tensions, to biomass and their nutrient content
Contributor:Van Veen, Johannes A.; Paul, Eldor A.
Direct microscopic measurements of biomass in soil require conversion factors for calculation of the mass of microorganisms from the measured volumes. These factors were determined for two bacteria, five fungi, and a yeast ...
The extraction and measurement of adenosine triphosphate from marine sediment
Contributor:Paul, E. A.; Bancroft, K.; Wiebe, W. J.
A technique has been developed, using boiling sodium bicarbonate buffer, to extract adenosine triphosphate (ATP) from marine sediments and has been tested on a variety of sediments, including those with high organic content, ...
Decomposition of 14C-labelled plant material under field conditions
Contributor:Paul, E. A.; Shields, J. A.
Mature, uniformly labelled (14C, 15N), chopped, wheat straw incorporated in the plow layer of a Brown Chernozemic soil and a Gray Wooded soil was allowed to decompose in the field. Labelled grass material (14C) was added ...
Natural nitrogen-15 abundance of soil and plant samples
Contributor:Rennie, D. A.; Johns, L. E.; Paul, E. A.
Nitrogen isotope analysis of total soil N and soil-derived nitrate for nine selected Chernozemic and Luvisolic Ap horizons showed mean δa15N values based on atmospheric abundance of 8.8. Luvisolic soils were characterized ...
Effect of soil moisture stress on uptake and recovery of tagged nitrogen by wheat
Contributor:Paul, E. A.; Myers, R. J. K.
Labelled 15NH4NO3 was used in a growth chamber to study the effect of moisture stress on the utilization of nitrogen by wheat. This made it possible to determine the recovery of nitrogen (N) in the soil-plant system of two ...
Plant components and soil organic matter
Contributor:Paul, Eldor A.
Large amounts of cellulose, aromatics, and proteinaceous compounds are introduced into the geochemical carbon pool as products of biological activity, or by economic and public health endeavors. Industrial wastes, pesticides, ...
Modèle de répartition du carbone assimilé dans une prairie naturelle
Contributor:Randell, R. L.; Paul, Eldor A.; Warembourg, F. R.; More, R. B.
A mathematical compartments model based on differential equations and describing the distribution of photoassimilated carbon in grassland is presented. The model includes four compartments: green leaf structure, dead leaves, ...
The use of tracers to determine the dynamic nature of organic matter
Contributor:van Veen, J. A.; Paul, Eldor A.
Early experiments with 13C, 14C and 15N established the high rate of internal cycling of soil organic matter and reintroduced the concept of an active and passive phase in soil humus turnover. Later studies confirmed ...