human activities have continuously increased the level of heavy metal ions circulating in the environment. it is important to understand the tolerance of plant species to high concentrations of heavy metals. very little is known on the response of eucalyptus species to zn and cu toxic concentrations eucalyptus camaldulensis, e. microtheca, and e. occidentalis seeds were grown in silt and irriga...

this study investigated the effects of sewage discharge on nutrient concentrations and bod5 levels in the coastal waters and sediments ofthe city of mombasa. the results indicated that nutrient concentrations in tudor, mtwapa and makupa creeks were elevated as compared to concentrations in gazi creek (mean ranges of 0.022-0.039mg/l, 0.038-0.163mg/l and 0.034-0.118mg/lphosphates, nitrates and a...

We explored how N, S, P, Ca, K, Mg, Zn and Mn concentrations in percolation water (PW) and organic layer (OL) are reflected in the respective element concentrations in Scots pine and Norway spruce current needles. For both tree species, N and Ca had the highest covariation (Radj 2 ≥ 0.73) between nutrient concentrations in the OL and in the needles. Mean N, S, P, K, Zn and Mn concentrations in ...

1. Abundance and composition of periphyton and benthic macroinvertebrates were treated as potential nutrient response variables for 74 streams in montane Colorado. The streams ranged from unenriched to mildly enriched with nutrients (N, P). 2. The study showed no meaningful relationship between periphyton biomass accumulation and concentrations of total or dissolved forms of nitrogen or phospho...

Innate distributions or variability of nutrient concentrations within the fluvial system must be better understood to establish nutrient guidelines that are applicable and to discern which areas or landscape positions within the watershed are more vulnerable to nutrient losses. This work was conducted to (1) determine the system-wide spatial distribution of N and P concentrations in biweekly st...

[1] Reconstruction of oceanic nutrient concentrations in the past provides information about nutrient cycling and physical circulation and the role these processes have played in past climate changes. The Cd/Ca and Zn/Ca of benthic foraminifera have been used successfully to reconstruct past deep ocean nutrient concentrations. In this study we test the ability of benthic foraminiferal Cd/Ca and...

Nutrient pollution remains one of the leading causes river degradation, making it important to set thresholds that support good ecological condition, which is main objective managing Europe's aquatic environment. A wide range methods has been used by European member states nutrient in past, and these vary greatly among countries, even for similar types. In some have using expert judgement or st...

ABSTRACT In the last years, jambu has become popular and greatly appreciated, due to its remarkable taste. Thus, hydroponically cultivated is promising, since it achieves better yield production quality. The aim of this study was evaluate effect ionic concentration in nutrient solution on growth, productivity gas exchange jambu. experimental design completely randomized, with five treatments fo...

Global nutrient cycles have been altered by the use of fossil fuels and fertilizers resulting in increases in nutrient loads to aquatic systems. In the United States, excess nutrients have been repeatedly reported as the primary cause of lake water quality impairments. Setting nutrient criteria that are protective of a lakes ecological condition is one common solution; however, the data require...