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Spatial and Seasonal Variability of Heterotrophic and Autotrophic Soil Respiration in a Winter Wheat Stand : Volume 7, Issue 6 (15/12/2010)

By Prolingheuer, N.

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Book Id: WPLBN0004005669
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Spatial and Seasonal Variability of Heterotrophic and Autotrophic Soil Respiration in a Winter Wheat Stand : Volume 7, Issue 6 (15/12/2010)  
Author: Prolingheuer, N.
Volume: Vol. 7, Issue 6
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Vereecken, H., Graf, A., Herbst, M., Prolingheuer, N., & Scharnagl, B. (2010). Spatial and Seasonal Variability of Heterotrophic and Autotrophic Soil Respiration in a Winter Wheat Stand : Volume 7, Issue 6 (15/12/2010). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute of Bio- and Geosciences, IBG-3: Agrosphere, Forschungszentrum Jülich, 52425 Jülich, Germany. Soil respiration (Rs), the sum of respiration by soil organisms (Rh) and roots (Ra), is known to be highly variable in both, space and time. There is less information available about the behaviour of Rh and Ra in time and particularly in space. The objective of this study was to quantify the contribution of each component to the temporal and spatial variability of soil respiration in a winter wheat stand. We measured soil respiration from March to July 2009 by closed-dynamic chambers for 61 sampling points in a 50×50 m plot in a winter wheat stand close to Jülich, Germany. Each sampling point was equipped with a 7 cm soil collar to measure total Rs and a 50 cm soil collar to exclude roots and to measure Rh only. Ra was assumed to equal RsRh. Simultaneously, soil temperature and soil water content were measured in 6 cm depth. Biweekly the temporal development of the leaf area index was measured. On average, the heterotrophic contribution to Rs was 69% and thus higher than the autotrophic contribution. Seasonal changes of soil temperature and especially water content explained well the temporal variability of Rs (r2=0.74) and Ra (r2=0.80). Spatial variability of Ra was on average much higher (CV=88%) than the spatial variability of Rh (CV=30%). However, Rh was mainly randomly distributed in space, whereas Ra showed spatial autocorrelation. Spatial correlation and cross-variograms showed a significant spatial dependence of Rs on Ra. From our results we concluded that spatial variability of soil respiration in a winter wheat stand represented mainly the spatial variability of the autotrophic component.

Summary
Spatial and seasonal variability of heterotrophic and autotrophic soil respiration in a winter wheat stand

Excerpt
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