ISSN 1067-4136, Russian Journal of Ecology, 2016, Vol. 47, No. 1, pp. 107–113. © Pleiades Publishing, Ltd., 2016.
Interpreting soil CO
Transport and Production
in Oasis Cotton Field, Central Asia
, Feng-xia Shi
, and Ibrahim Mohamed
College of Environmental Science and Tourism, NanYang Normal University, Nan Yang 473000
State Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, CAS
Urumqi 830011, China
Soil Science Department, Faculty of Agriculture, Benha University, Moshtohor, Toukh, Kalyoubia 13736, Egypt
Received February 2, 2015
Abstract—In order to explore soil profile CO
transport and production, values of vertical soil profile CO
concentration, moisture and temperature were measured continuously during whole cotton growing season
in oasis cotton field of Aksu National Experimental Station of Oasis Farmland Ecosystem, central Asia.
Simultaneously, soil CO
efflux was measured by chamber system to assess the deducing result by Fick’s first
law. In our experiment, soil CO
effluxes were determined by two related intimately methods. Soil CO
releasing at 0–20 cm depth was calculated by gas transport equation and was found to be closely related to soil
efflux. However, mean values of soil CO
production at 0–20 cm depth were less than those of soil CO
efflux during the whole cotton growing season. Moreover, there were some negative values of CO
at 0–20 cm depth found during the experimental period.
Keywords: efflux, production, CO
oasis cotton field, Aksu National Experimental Station of Oasis Farmland
A better understanding of the global carbon cycle is
necessary to study global climate changes and their
effects on our future environment. Soils are consid-
ered as an important compound in the global carbon
cycle (Houghton et al., 1995; Schimel, 1995). Soils
contain more carbon amounts compared with live bio-
mass (Eswaran et al., 1993) and the release of CO
from soils can be a major flux of C to the atmosphere
(Schlesinger and Andrews, 2000).
efflux results from the combination of
production by autotrophic (root and mycorrhiza)
and heterotrophic (decomposers) activities (Hanson
et al., 2000), and then can transfer by diffusion
through the porous medium in the soil. Over the last
decade, many studies focus on CO
efflux at the soil
surface. Some studies show that the controlling factors
production and transport in soils are different
(Hamada and Tanaka, 2001; Jassal et al., 2004).
Therefore, quantifying of CO
releasing and move-
ment and their governing factors are essential for
understanding soil biological processes that affect the
climate change. Farmland ecosystem is frequently
affected by human activities of human and can be eas-
ier managed than other ecosystems.
Exploration of CO
production and transport
mechanisms can improve the management of soil sur-
effluxes in farmland.
Variation of CO
concentrations in the soil can
reflect both CO
production and transport.
So, it is useful to explore the mechanism affecting
production and transport in soil by measuring
soil profile CO
concentration at different depths.
In this study, CO
concentrations at different
depths of the soil profile, CO
efflux at soil surface,
and factors influencing CO
production and transport
were simultaneously measured in an oasis cotton field,
The basic hypothesis of our study is that the mea-
efflux at soil surface cannot thoroughly
reflect the variation of CO
production and soil respi-
ration in the soil, especially in arid areas.
The objective of this study is to investigate soil CO
production and transport and their main controlling
factors at different depths of soil profile.
The article is published in the original.