Author : Taylor Leigh McCleery
Publisher :
ISBN 13 :
Total Pages : 121 pages
Book Rating : 4.:/5 (95 download)
Book Synopsis Soil Microbial Enzyme Responses to Changes in Temperature and Nutrient Additions Across Hawaiian Gradients in Mineralogy and Nutrient Availability by : Taylor Leigh McCleery
Download or read book Soil Microbial Enzyme Responses to Changes in Temperature and Nutrient Additions Across Hawaiian Gradients in Mineralogy and Nutrient Availability written by Taylor Leigh McCleery and published by . This book was released on 2014 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbial enzyme activities are the direct agents of organic matter decomposition, and thus play a crucial role in global C (C) cycling. Global change factors like anthropogenic nutrient inputs and warming have the potential to alter the activities of these enzymes, with background site conditions likely driving responses. We hypothesized that enzyme activities in sites with high background soil nutrient and/or C availability would be less sensitive to nutrient additions than nutrient-poor sites. We also hypothesized that sites poor in nutrients and/or C would show greater sensitivity to changes in temperature. To test our hypotheses we used long- and short-term nutrient additions combined with laboratory temperature incubations to assess changes in enzyme activities for 8 common soil enzymes that acquire nitrogen (N), phosphorus (P) and C from organic matter. We collected mineral soils (0-10 cm depth) from 8 Hawaiian sites that provided maximum variation in nutrient availability and background soil C. Soils were sieved, pooled by site, and homogenized prior to a laboratory addition of a simple C (sucrose), N, and/or P in full factorial design. The 8 soils also were incubated at 7 temperatures from 4 - 40 ðC. We found that the laboratory fertilizations altered enzyme activities, and that temperature sensitivities varied significantly among sites. Across the 8 sites, laboratory sucrose+N and sucrose+NP additions increased C-, N-, and P- acquiring enzymes activities (p