Regulation of decomposition in Alaska tundra and root mycorrihizal processes in tundra soils: Progress report

Technical Report · Sat Nov 01 00:00:00 EST 1986

OSTI ID:5010318

Linkins, A E

The root surface phosphatase activity of Eriophorum vaginatum appears to be coupled with assimilation of inorganic phosphate. This uptake is not enhanced by rhizosphere microorganisms or inhibited to any substantial degree by inorganic phosphate. Some differences in uptake rates were detected for roots from sites differing in productivity, plant nutrient status, and soil nutrient levels, but these differences did not parallel differences in phosphatase hydrolysis rates as measured by pNPP. It is possible that the rates for /sup 32/P uptake and those determined for pNPP hydrolysis are measuring different reactions. E. vaginatum produces a new root system annually, and its root system is dense enough that nearly all the tussock soil volume is exploited. Tundra soils average 11.5 ..mu..moles L/sup -1/ soluble organic phosphorus, a concentration only slightly higher than the 10 ..mu..M solutions used in this study. Calculations based on total root surface area and on the uptake rates determined in this study indicate that an E. vaginatum tussock could, at soil pH and temperature, assimilate as much as 0.153 ..mu..moles min/sup -1/ phosphate from organic phosphate sources. 6 refs., 3 figs.

• Research Organization: Clarkson Univ., Potsdam, NY (USA). Dept. of Biology
• DOE Contract Number: FG02-86ER60492
• OSTI ID: 5010318
• Report Number(s): DOE/ER/60492-2; ON: DE87002360
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
09 BIOMASS FUELS
GRASS
ENZYME ACTIVITY
PHOSPHATES
UPTAKE
BIODEGRADATION
MYCORRHIZAS
PHOSPHATASES
PHOSPHORUS 32
ROOT ABSORPTION
SOIL CHEMISTRY
TRACER TECHNIQUES
TUNDRA
ABSORPTION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL REACTIONS
CHEMISTRY
DAYS LIVING RADIOISOTOPES
DECOMPOSITION
ENZYMES
ESTERASES
HYDROLASES
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
PLANTS
RADIOISOTOPES
510101* - Environment
Terrestrial- Basic Studies- Radiometric Techniques- (-1989)
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)