Flooded soil

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Contents 1 List of topics 2 Introduction 3 Process 3.1 Exchange of atmospheric gases 3.1.1 Oxygen 3.1.2 Carbon dioxide 3.1.3 Nitrogen 3.1.4 Methane 3.2 pH 3.3 Eh 3.4 Solubility/mobility of mineral 3.5 Effects on life 3.5.1 Plant nutrient availability 3.5.2 Microorganism activity 4 Key Microorganisms 4.1 Sulfate reducing bacteria 4.2 Methaneous bacteria 5 Current Research 6 References 7 Edits and Dates

List of topics

1. Exchange of gases
2. Mobility and Solubility of Chemical
3. Effects on life

Introduction

Process

Exchange of atmospheric gases

Oxygen

Cold water is less injurious than warm water due to cold water's capacity to hold more dissolved oxygen. Rapidly flowing water (with higher oxygen content) is less harmful than stagnant water.

Carbon dioxide

Nitrogen

Methane

pH

Eh

Solubility/mobility of mineral

Effects on life

Plant nutrient availability

Flooded soils can prevent efficient gas exchange between the plant root and the soil. pH plays a main role in a healthy plant growth process. In flooded soils, under anaerobic conditions the pH value wil tend to rise. Denitrification of soil nitrate to nitrogen gas plays a major role in the rise of pH levels. Flooding results in poor soil aeration because the supply of oxygen to flooded soil is severely limited. Oxygen deficiency is likely the most important environmental factor that triggers growth inhibition and injury in flooded plants

Microorganism activity

Key Microorganisms

Sulfate reducing bacteria

Methaneous bacteria

Current Research

References

Edits and Dates

Jan.30.2008 Sungho and Laleh:outline 3-7-08 LaBrother has joined

Edited by students of Kate Scow