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Journal of Arid Land  2016, Vol. 8 Issue (3): 341-349    DOI: 10.1007/s40333-016-0081-0
Research Articles     
Diurnal and seasonal variations of soil respiration rate under different row-spacing in a Panicum virgatum L. field on semi-arid Loess Plateau of China
HUANG Jin1,2, GAO Zhijuan1, CHEN Ji1, ZHANG He1, XU Bingcheng1,2*
1 Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China;
2 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
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Abstract  Soil respiration (SR) in crop field is affected by environmental factors, agronomic practices and crop types. To clarify how planting density affects the SR dynamics in switchgrass (Panicum virgatum L.) field on the semi-arid Loess Plateau, this research investigated diurnal and seasonal changes of soil respiration rate (RS) under three different row-spacing treatments (20, 40 and 60 cm) in the fourth growing year of switchgrass. Results showed that RS presented a pronounced seasonality under all row-spacing treatments. The highest daily average RS values appeared in August, while the lowest (P<0.05) were in September for each row-spacing. Diurnal variations of RS exhibited single-peak curves in each month. Daily average RS increased significantly as row-spacing enlarged during May and August but there was no significant difference among row-spacing treatments in September. Soil water storage in the depth of 0–100 cm had no significant difference (P>0.05) among the row-spacing treatments, and similar results were found for soil temperature in 0–15 cm soil depth. Soil respiration temperature sensitivity (Q10) values were 1.0–3.7 during the growing months, which were strongly correlated with air temperature in May and June and the soil temperature at 15 cm depth in August. Higher aboveground biomass production and lower RS in most growth months indicated that 20 cm row-spacing treatment was beneficial for increasing the carbon fixation in switchgrass field. Results also implied that it is necessary to take into account the in?uence of phenology and root growth of switchgrass on soil respiration for accurately evaluating the carbon cycle in the region.

Key wordsmicrotopography      univariate spatial patterns      aggregation      negative association      positive association     
Received: 19 May 2015      Published: 01 June 2016

The Program for New Century Excellent Talents in University (NCET-11-0444)
The Fundamental Research Funds for the Central Universities (ZD2013020)

Corresponding Authors: XU Bingcheng     E-mail:
Cite this article:

HUANG Jin, GAO Zhijuan, CHEN Ji, ZHANG He, XU Bingcheng. Diurnal and seasonal variations of soil respiration rate under different row-spacing in a Panicum virgatum L. field on semi-arid Loess Plateau of China. Journal of Arid Land, 2016, 8(3): 341-349.

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