Influence of Long-Term Thinning on the Biomass Carbon and Soil Respiration in a Larch Larix gmelinii Forest in Northeastern ChinaReportar como inadecuado




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The Scientific World JournalVolume 2013 2013, Article ID 865645, 9 pages

Research Article

Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, China

College of Art and Landscape, Jiangxi Agricultural University, Nanchang 330045, China

Received 6 February 2013; Accepted 12 March 2013

Academic Editors: F. Darve and A. Roldán Garrigós

Copyright © 2013 Huimei Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Thinning management is used to improve timber production, but only a few data are available on how it influences ecosystem C sink capacity. This study aims to clarify the effects of thinning on C sinks of larch plantations, the most widespread forests in Northeastern China. Both C influx from biomass production and C efflux from each soil respiration component and its temperature sensitivity were determined for scaling-up ecosystem C sink estimation: microbial composition is measured for clarifying mechanism for respiratory changes from thinning treatment. Thinning management induced 6.23 mol C m

 yr

increase in biomass C, while the decrease in heterotrophic respiration at the thinned sites 0.9 mol C m

 yr

has enhanced 14% of this biomass C increase. This decrease in was a sum of the 42% decrease 4.1 mol C m

 yr

in litter respiration and 3.2 mol C m

 yr

more CO2 efflux from mineral soil in thinned sites compared with unthinned control. Increases in temperature, temperature sensitivity, alteration of litters, and microbial composition may be responsible for the contrary changes in from mineral soil and litter respiration, respectively. These findings manifested that thinning management of larch plantations could enhance biomass accumulation and decrease respiratory efflux from soil, which resulted in the effectiveness improvement in sequestrating C in forest ecosystems.





Autor: Huimei Wang, Wei Liu, Wenjie Wang, and Yuangang Zu

Fuente: https://www.hindawi.com/



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