Zobrazeno 1 - 10
of 102
pro vyhledávání: '"David F. Spencer"'
Publikováno v:
Journal of Freshwater Ecology. 28:397-409
The presence of vegetation in a channel may influence water movement in the channel and the surrounding land in several ways. One hypothesis is that increased abundance of the invasive plant Arundo donax in a watercourse contributes to increased floo
Reducing rice field algae and cyanobacteria abundance by altering phosphorus fertilizer applications
Autor:
David F. Spencer, Bruce A. Linquist
Publikováno v:
Paddy and Water Environment. 12:147-154
In California’s water-seeded rice systems, algal/cyanobacterial biomass can be a problem during rice establishment and can lead to yield reductions. Laboratory, enclosure, and field-scale experiments were established to evaluate the effects of fert
Autor:
Robert J.M. Eveleigh, Michael W. Gray, John M. Archibald, Julia F. Hopkins, Jonathan A. D. Neilson, Dion G. Durnford, Sylvie Laboissiere, David F. Spencer
Publikováno v:
Genome Biology and Evolution
Chlorarachniophytes are unicellular marine algae with plastids (chloroplasts) of secondary endosymbiotic origin. Chlorarachniophyte cells retain the remnant nucleus (nucleomorph) and cytoplasm (periplastidial compartment, PPC) of the green algal endo
Autor:
David F. Spencer
Publikováno v:
Invasive Plant Science and Management. 5:317-322
A species' successful invasion into a new site depends on its ability to persist in the local environment. An experiment was conducted to examine the response of giant reed to intermittent periods of shading for 2 yr. Results indicate that giant reed
Publikováno v:
Paddy and Water Environment. 11:611-617
Cyanobacteria and algae grow in California rice fields where they form large mats that may smother seedlings or cause them to dislodge, resulting in reduced rice stand establishment and potential yield loss. The most troublesome species of cyanobacte
Publikováno v:
Field Crops Research. 131:81-87
In water-seeded rice systems, cyanobacteria (Nostoc spongiaeforme) hinder early-season crop growth by dislodging and reducing light to seedlings. Since algae are often phosphorus (P) limited, we investigated whether changing the timing of P fertilize
Autor:
David F. Spencer
Publikováno v:
Journal of Freshwater Ecology. :1-11
Arundo donax (giant reed) is a tall clonal invasive grass which has impacted many riparian ecosystems in the US. Experiments tested the hypotheses (1) that defoliation would affect A. donax stem growth and leaf production and (2) that leaf damage or
Publikováno v:
Journal of Freshwater Ecology. 26:357-363
Cyanobacteria and algae are problematic in California rice fields that are typically shallow and have high nutrient levels, providing ideal growing conditions. Nostoc spongiaeforme is a problem because extensive floating mats dislodge rice seedlings
Autor:
David F. Spencer, Marcel Rejmánek
Publikováno v:
Aquatic Botany. 92:239-244
Competitive abilities of Potamogeton pectinatus L. and Potamogeton gramineus L. were estimated using additive series experiments at across a gradient of total daily irradiance ranging from 1.2 to 9.7 mol m−2 day−1. Results for P. gramineus showed
Publikováno v:
Science China Life Sciences. 53:273-285
Salvia miltiorrhiza Bge. is a well-known traditional Chinese herb. Its roots have been formulated and used clinically for the treatment of various diseases. However, little genetic information has so far been available and this fact has become a majo