搜索结果: 106-120 共查到“理学 phosphorus”相关记录159条 . 查询时间(0.099 秒)
Is phosphorus retention in autochthonous lake sediments controlled by oxygen or phosphorus?
autochthonous lake sediments phosphorus retention
2014/4/30
Eutrophication of various lakes on the Swiss Plateau was targeted in the 1980s by reducing external nutrient
loading and installing aeration/oxygenation systems. For five eutrophic lakes, three...
An empirical model describing the seasonal dynamics of phosphorus in 16 shallow eutrophic lakes after external loading reduction
p An empirical model describing phosphorus
2014/4/30
Based on monthly mass balances on 7–8 yr of data from 16 shallow (mean depth: 1–10 m), eutrophic, unstratified,
or only temporarily stratified Danish lakes, we developed a simple empirica...
Responses of estuarine and coastal marine phytoplankton to nitrogen and phosphorus enrichment
estuarine coastal marine phytoplankton
2014/4/30
A cross-ecosystem comparison of data obtained from 92 coastal zone ecosystems worldwide revealed a strong
positive response of marine phytoplankton biomass to nutrient enrichment that is highly consi...
Evidence for a delayed response of riverine phosphorus exports from increasing agricultural catchment pressures in the Lough Neagh catchment
riverine phosphorus exports riverine phosphorus exports
2014/4/30
Total phosphorus (TP) exports from the rivers draining into Lough Neagh increased between 1974 and 2000
despite lower TP inputs to the rivers from point sources. Over this period annual diffuse expor...
Fast growth and turnover of chironomid assemblages in response to stream phosphorus levels in a tropical lowland landscape
Fast growth turnover of chironomid assemblages
2014/4/23
We studied the response of a dominant primary consumer, larval Chironomidae (Diptera), to phosphorus (via a
microbial response) across eight detritus-based streams spanning a gradient in soluble reac...
Effect of ultraviolet radiation on alkaline phosphatase activity and planktonic phosphorus acquisition in Canadian boreal shield lakes
Effect of ultraviolet radiation alkaline phosphatase activity planktonic phosphorus acquisition Canadian boreal shield lakes
2014/5/13
We examined how ultraviolet radiation (UVR) affects the activity of alkaline phosphatase (APase), a common extracellular enzyme. APase activity declined up to 57% under UVR exposure and decreased more...
Effects of dissolved carbon dioxide, zinc, and manganese on the cadmium to phosphorus ratio in natural phytoplankton assemblages
Effects of dissolved carbon dioxide, zinc, and manganese the cadmium to phosphorus ratio natural phytoplankton assemblages
2014/5/9
We report the results of a field study, in productive waters off California, of the factors that control the particulate cadmium (Cd) : phosphorus (P) composition of natural assemblages of marine phyt...
Effect of macrozoobenthos on two-dimensional small-scale heterogeneity of pore water phosphorus concentrations in lake sediments: A laboratory study
Effect of macrozoobenthos two-dimensional small-scale heterogeneity pore water phosphorus concentrations lake sediments A laboratory study
2014/5/9
We used mesocosms equipped with two-dimensional (2D) pore water samplers (24 rows X 24 columns, 9-mm spatial resolution) to resolve and quantify some of the complex spatial patterns in diagenetic reac...
The effect of growth rate, phosphorus concentration, and temperature on N2 fixation, carbon fixation, and nitrogen release in continuous cultures of Trichodesmium IMS101
growth rate phosphorus concentration temperature on N2 fixation carbon fixation nitrogen release continuous cultures Trichodesmium IMS101
2014/5/9
With the use of continuous culture systems, rates of dinitrogen (N2) and carbon (C) fixation and nitrogen (N)- and C-based doubling times were assessed in Trichodesmium IMS101 growing exponentially at...
Differential effects of phosphorus and fatty acids on Daphnia growth and reproduction
phosphorus and fatty acids Daphnia growth and reproduction
2014/5/8
We investigated the effects of various mineral and biochemical limitations on Daphnia magna. These daphniids have much lower saturation thresholds for growth for the polyunsaturated fatty acids (PUFA)...
Seasonal cycling of phosphorus in the Southern Bight of the North Sea
Seasonal cycling phosphorus Southern Bight North Sea
2010/1/12
We have investigated the seasonal cycle of nutrients, chlorophyll a, dissolved organic nitrogen (DON), and dissolved and particulate organic carbon (DOC and POC) for 10 stations in the Belgian coastal...
Taxonomic variability of phosphorus stress in Sargasso Sea phytoplankton
Taxonomic variability phosphorus stressLSargasso Sea phytoplankton
2014/5/19
Low inorganic phosphorus (SRP) concentrations and high inorganic nitrogen to phosphorus ratios suggest that phytoplankton production in the northwestern Sargasso Sea may be controlled to some extent b...
Effect of seasonal sediment storage in the lower Mississippi River on the flux of reactive particulate phosphorus to the Gulf of Mexico
seasonal sediment storage lower Mississippi River reactive particulate phosphorus Gulf of Mexico
2014/5/19
The annual surface water flux of total reactive (i.e., potentially bioavailable) particulate P from the Mississippi River was estimated by measuring the reactive (including labile, iron, organic, and ...
Growth rates of Antarctic krill, Euphausia superba: Comparison of the instantaneous growth rate method with nitrogen and phosphorus stoichiometry
Growth rates of Antarctic krill Euphausia superba Comparison of the instantaneous growth rate method with nitrogen phosphorus stoichiometry
2014/5/19
Zooplankton growth rates are hard to measure directly, and proxy measurements are desirable to encompass the variety of species and scales of interest. The growth rate hypothesis of stoichiometric the...
Responses of seagrass communities to fertilization along a gradient of relative availability of nitrogen and phosphorus in a carbonate environment
Responses of seagrass communities to fertilization a gradient of relative availability nitrogen and phosphorus carbonate environment
2014/5/19
Patterns of relative nutrient availability in south Florida suggest spatial differences regarding the importance of nitrogen (N) and phosphorus (P) to benthic primary producers. We did a 14-month in s...