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01-03-2014 | Original Article

Soil CO₂ efflux along an elevation gradient in Qinghai spruce forests in the upper reaches of the Heihe River, northwest China

Authors: Xianglin Zheng, Chuanyan Zhao, Shouzhang Peng, Shengqi Jian, Bei Liang, Xiaoping Wang, Shifei Yang, Chao Wang, Huanhua Peng, Yao Wang

Published in: Environmental Earth Sciences | Issue 5/2014

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Abstract

This study was conducted in six plots along an elevation gradient in the Qinghai spruce (Picea crassifolia Kom.) forest ecosystem of the Qilian Mountains, northwest China. Soil CO₂ efflux over bare soil (R _s) and moss covered soil (R _s+m) were investigated from June to September in 2010 and 2011 by means of an automated soil CO₂ flux system (LI-8100). The results showed that R _s ranged from 1.51 to 3.96 (mean 2.64 ± 0.72) μmol m⁻² s⁻¹ for 2010, and from 1.41 to 4.09 (mean 2.55 ± 0.70) μmol m⁻² s⁻¹ for 2011. The daily change trend of R _s resembled that of air temperature (T _a), and there was a hysteresis between R _s and soil temperature (T _s). The seasonal variations of R _s at lowlands (i.e., Plot 1, Plot 2 and Plot 3) were driven by soil moisture and temperature (T _a and T _s), while that at highlands (i.e., Plot 4, Plot 5 and Plot 6) were obviously affected by temperature. There were higher values at Plot 2 and Plot 6, which were caused by the interaction between soil moisture and temperature. In addition, soil CO₂ efflux over moss covered soil (R _s+m) was 8.83 % less than that over bare soil (R _s), indicating that moss was another factor affecting R _s. It was concluded that R _s had temporal and spatial variations and was mainly controlled by temperature and soil moisture; the main determinants differed at different elevations; moss could reduce R _s.

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Title: Soil CO2 efflux along an elevation gradient in Qinghai spruce forests in the upper reaches of the Heihe River, northwest China
Authors: Xianglin Zheng
Chuanyan Zhao
Shouzhang Peng
Shengqi Jian
Bei Liang
Xiaoping Wang
Shifei Yang
Chao Wang
Huanhua Peng
Yao Wang
Publication date: 01-03-2014
Publisher: Springer Berlin Heidelberg
Published in: Environmental Earth Sciences / Issue 5/2014
Print ISSN: 1866-6280
Electronic ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-013-2608-4

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