搜索结果: 136-150 共查到“理学 phosphorus”相关记录159条 . 查询时间(0.078 秒)
Lake metabolism: Relationships with dissolved organic carbon and phosphorus
Lake metabolism dissolved organic carbon phosphorus
2014/5/20
Recent literature has suggested that for many lakes and rivers, the respiratory breakdown of organic matter (R) exceeds production of organic matter by photosynthesis (gross primary production [GPP]) ...
Enhanced phosphorus accumulation efficiency by the pelagic community at reduced phosphorus supply: A lake experiment from bacteria to metazoan zooplankton
Enhanced phosphorus accumulation efficiency the pelagic community reduced phosphorus A lake experiment bacteria to metazoan zooplankton
2014/5/20
The effects of experimentally reduced total phosphorus concentrations (TP) from 2.4 to 0.6 μmol L-1 on plankton community in a shallow lake were evaluated from the proportion between dissolved reactiv...
Measurements of phosphate affinity constants and phosphorus release rates from the microbial food web in Villefranche Bay, northwestern Mediterranean
phosphate affinity constants phosphorus release rates microbial food web Villefranche Bay north western Mediterranean
2014/5/20
Using 32>P, uptake and transfer of phosphorus in the microbial food web were studied in surface water from Villefranche Bay (northwestern Mediterranean) from September to December 2001. During the stu...
Effects of Phytase Supplementation on the Performance of Broiler Chickens Fed Maize and Wheat Based Diets with Different Levels of Non-Phytate Phosphorus
Broiler Phytase Maize Wheat Non-Phytate Phosphorus Nitrogen
2016/4/14
An experiment was conducted to evaluate the effects of phytase supplementation on the growth performance, nutrients utilization and bone mineralization in broiler chickens. Day-old broiler chicks (n=4...
Why the phosphorus retention of lakes does not necessarily depend on the oxygen supply to their sediment surface
phosphorus retention of lakes oxygen supply sediment surface
2014/5/20
In order to improve the trophic state of Lake Sempach, a eutrophied lake in central Switzerland, its external phosphorus (P) load has been decreased and its hypolimnion has been artificially oxygenate...
The role of dust in supplying nitrogen and phosphorus to the Southeast Mediterranean
The role of dust supplying nitrogen and phosphorus Southeast Mediterranean
2014/5/27
This study assesses the role of the atmospheric dry fallout as a source of new nitrogen and phosphorus to the surface Levantine seawater. Leaching experiments of inorganic nitrogen (LINO3-, LINH4+) an...
Cycling of phosphorus maintains the production of microphytobenthic communities in carbonate sediments of a coral reef
Cycling of phosphorus maintains production of microphytobenthic communities carbonate sediments coral reef
2014/5/27
The phosphorus (P) cycle that maintains the production of microphytobenthic communities in carbonate sediments was investigated in the fringing Shiraho coral reef system located off the east coast of ...
Phosphorus cycling in the North Pacific Subtropical Gyre using cosmogenic 32P and 33P
Phosphorus cycling North Pacific Subtropical Gyre cosmogenic 32P and 33P
2014/5/27
The North Pacific Subtropical Gyre (NPSG) has been hypothesized to be in transition from a nitrogen (N)-limited system to one predominantly limited by phosphorus (P) as a result of a two-decade-long s...
Carbon, nitrogen, and phosphorus budgets for a shallow subtropical coastal embayment (Moreton Bay, Australia)
Carbon nitrogen phosphorus shallow subtropical coastal embayment
2014/5/27
Average annual carbon, nitrogen, and phosphorus budgets were constructed for Moreton Bay. Primary production was the dominant source of carbon (by two orders of magnitude), N fixation was the dominant...
Life history bottlenecks in Diaptomus clavipes induced by phosphorus-limited algae
Life history bottlenecks Diaptomus clavipes induced phosphorus-limited algae
2014/5/27
Considerable information has accumulated on food quality effects on certain cladocerans; meanwhile, other zooplankton have received comparatively little nutritional study. In particular, little is sti...
Iron-sulfur-phosphorus cycling in the sediments of a shallow coastal bay: Implications for sediment nutrient release and benthic macroalgal blooms
Iron-sulfur-phosphorus cycling in the sediments shallow coastal bay:sediment nutrient release benthic macroalgal blooms
2014/5/26
We conducted a study to determine the seasonal relationship between iron, sulfur, and phosphorus in the upper sediments and pore waters of a shallow intercoastal bay. From April 1999 to September 2000...
Landscape variation in phosphorus concentration and effects on detritus-based tropical streams
Landscape variation phosphorus concentration on detritus-based tropical streams
2014/5/26
Landscape-scale variation in streamwater phosphorus (P) concentration can affect aquatic food webs. Such variation occurs naturally in streams at La Selva Biological Station in Costa Rica due to spati...
Phytoplankton phosphorus deficiency and alkaline phosphatase activity in the McMurdo Dry Valley lakes, Antarctica
Phytoplankton phosphorus deficiency alkaline phosphatase activity McMurdo Dry Valley lakes Antarctica
2014/6/9
We assessed the nutrient (N, P) deficiency of phytoplankton from the perennially ice-covered lakes in Taylor Valley, Antarctica, with 14C-based bioassays. Phytoplankton in the near-surface waters from...
Effects of dietary phosphorus deficiency on the abundance, phosphorus balance, and growth of Daphnia cucullata in three hypereutrophic Dutch lakes
dietary phosphorus defi ciency abundance phosphorus balance
2014/5/30
We studied population dynamics, phosphorus balance, and individual growth to evaluate limitation of Daphnia
cucullata by dietary phosphorus (P) in three interconnected, hypereutrophic Dutch lakes. Co...
Composition and cycling of marine organic phosphorus
marine organic phosphorus Composition cycling
2014/5/30
Using tangential-flow ultrafiltration and solid-state
31
P nuclear magnetic resonance (NMR) spectroscopy, the
dominant compound classes of marine high–molecular weight (1–100-nm size fr...