tailieunhanh - Heavy Metals in the Environment: Using Wetlands for Their Removal - Chapter 5

Chương 5 bao gồm các nghiên cứu sinh thái của Lowell Pritchard, Jr Chương 6 bao gồm các nghiên cứu hóa học bằng cách Shanshin Tôn và Joseph J. Delfino. Chương 7 có các nghiên cứu của Microcosms đất ngập nước có pha chì Shanshin Tôn. Cuối cùng, Chương 8 báo cáo mô phỏng máy tính của một mô hình của chì trong các vùng đất ngập nước bởi Shanshin Tôn và Howard T. Odum. | Part II Lead in a Cypress-Gum Swamp Jackson County Florida Part II has four chapters summarizing the studies of a lead-filled swamp in Florida. Chapter 5 contains the ecological studies by Lowell Pritchard Jr. Chapter 6 contains the chemical studies by Shanshin Ton and Joseph J. Delfino. Chapter 7 has the studies of leaded wetland microcosms by Shanshin Ton. Finally Chapter 8 reports the computer simulation of a model of lead in the wetland by Shanshin Ton and Howard T. Odum. 2000 by CRC Press LLC CHAPTER 5 Ecological Assessment of the Steele City Swamps Lowell Pritchard Jr. CONTENTS Toxicity Assessment with Planted Tree Basal Area of Tree Green Leaf Productivity of Emergent Metabolism of the Underwater Invertebrate Indices of Overview At the time of this study the Steele City Swamps showed varying degrees of impact caused less by the large quantities of lead that was filtered than by the high acidity of the battery plant water. Figure shows the distribution of lead in sediments with larger values upstream and along the pathway of water flow. At Station A Figure there were a few dead trees and the wood in cross section was strangely red colored. Much of the pond at B was devoid of trees but covered in part with floating plants Nymphaea . The waters were turbid with underwater objects visible only a few inches below the surface. Gum trees were scattered at Stations C and F but these had just a few leaves each. In backwater areas Stations D and H more trees were found including cypress. In other words trees were absent in the areas where the most lead had been absorbed Figure . Station RF reference forest was in a pond which had not received lead wastes and had a normal concentration of cypress and swamp black gum trees. A limited ecological assessment was made by testing seedling survival and growth in the field by measuring the area of green leaves by .