Competition for water between deep- and shallow-rooted grasses
- Washington State Univ., Pullman, WA (United States)
- Pacific Northwest Laboratory, Richland, WA (United States)
Competition between root systems of neighboring plants may be altered by seasonal variation in precipitation and soil moisture. Competitive effects of a deep-rooted, perennial grass, Pseudoroegneria spicata, on a shallow-rooted, perennial grass, Poa sandbergii, were monitored over two growing seasons by isolating the root system of P. sandbergii individuals within PVC tubes and comparing plant and soil characteristics to controls. When isolated for the entire growing season, P. sandbergii continued vegetative growth three weeks longer and later season soil water content was significantly greater than controls. Differences in soil water content were greatest between 30 and 50cm, below P. sandbergii's typical rooting depth. Flowering phenology was unchanged. When plants were isolated late in the season, treated plants showed more negative predown xylem pressure potential the morning after isolatron. Compared to controls, soil water content was reduced the day after tube insertion. These immediate effects on plant and soil water status may be due to removal of water supplied nightly by hydraulic lift.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 7016908
- Report Number(s):
- CONF-940894-; CODEN: BECLAG
- Journal Information:
- Bulletin of the Ecological Society of America; (United States), Vol. 75:2; Conference: Annual Ecological Society of America (ESA) meeting: science and public policy, Knoxville, TN (United States), 7-11 Aug 1994; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC PRECIPITATIONS
SEASONAL VARIATIONS
GRAMINEAE
POPULATION DYNAMICS
ROOTS
DEPTH
SOILS
MOISTURE
DIMENSIONS
LILIOPSIDA
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550000* - Biomedical Sciences
Basic Studies
540210 - Environment
Terrestrial- Basic Studies- (1990-)