Response of Amaranthus hybridus to metal stress and manure amendment in contaminated soil
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2012, Vol 2, Issue 10
Abstract
The effects of heavy metal contamination and manure amendment in soil on the growth of green Amaranthus hybridus were studied by pot experiments. A mineral soil was stressed with different doses (100 – 500 mg kg-1) of Cu and Pb using a binary mixture of the metal nitrates and/or amended with poultry or swine manure (at 10:1 soil:manure ratio). A. hybridus was sown and monitored for changes in growth rate, above-ground dry biomass and tissue Cu and Pb concentration for 49 days. A. hybridus was seemingly intolerant to metal stress as the plants exhibited yellowish appearance, stunted growth and decreased biomass at elevated metal doses in soil, though with reduced severity upon manure (especially poultry) amendment. Growth profiles were sigmoid at lower metal doses (0 – 300 mg kg-1) but plateau-like at higher doses (400 – 500 mg kg-1). Tissue Cu and Pb increased linearly as metal doses in unamended soils and non-linearly in manure-amended soils. Soil-to-plant transfer factors, f (%), indicated that Cu (11.2 ≤ f (%) ≤ 41.1) was more phytoavailable to A. hybridus than Pb (8.4 ≤ f (%) ≤ 17.0). Step-wise modeling of tissue Cu and Pb concentrations from soil pH, organic matter, plant available and pseudototal metal content by multiple regression analysis suggested that the models were more reliable with plant available metal as a covariate than pseudototal metal content.
Authors and Affiliations
Raymond A. Wuana, Phoebe A. Mbasugh, Moses S. Iorungwa
Keywords
Related Articles
- EP ID EP37276
- DOI -
- Views 234
- Downloads 0
Experimental analysis of upstream channel slope effect on discharge coefficient in side weirs
Weirs are one of the oldest and simplest hydraulic structures which are used by hydraulic engineers for centuries in flow measurement, loss of energy, diversion of flow, water depth adjustment and other purposes. Accord...
Biodiversity of drought resistance and indirect selection in safflower (Carthamus tinctorius L.) genotypes
Determination of the biodiversity, drought resistance indices and identify the resistant genotypes, were achieved using ten spring safflower cultivars. The cultivars were sown at drought and non-drought stress condition...
Waste water treatment in textile Industries-The concept and current removal technologies
The textile industry is one of the most promising industrial sectors that provide huge unskilled employment in the developing countries in Asia, particularly China, India and Bangladesh. Since textile industry is a very...
The changes of physical properties in transesterification of three different vegetable oils to biodiesel; comparison and evaluation to determine reaction conversion
In recent decade, since the fossil fuel sources are diminished, many researchers have proposed to use a pure, nontoxic and biodegradable fuel which is called biodiesel, instead of traditional diesel fuel. The progress of...
Assessment of conservation status in Caspian Sea coastal area by the use of Diversity Indices
This research was conducted to investigate the plant species diversity in the protected and non-protected sites via comparison of biodiversity and similarity indices. The research area comprised a coastal system in the n...