Seasonal patterns of soil respiration in three types of communities along grass-desert shrub transition in Inner Mongolia,China |
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Authors: | Zhao Jin Yuchun Qi Dong Yunshe Manfred Domroes |
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Institution: | Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101;
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment,
Chinese Academy of Sciences, Xi'an 710075;Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101;Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101;Institute of Geography, Mainz University, Mainz 55099, Germany |
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Abstract: | The seasonal dynamics of soil respiration in steppe (S. bungeana), desert shrub (A. ordosica),
and shrub-perennial (A. ordosica + C. komarovii) communities were investigated during the growth season
(May to October) in 2006; their environmental driving factors were also analyzed. In the three communities,
soil respiration showed similar characteristics in their growth seasons, with peak respiration values in
July and August owing to suitable temperature and soil moisture conditions during this period. Meanwhile,
changes in soil respiration were greatly influenced by temperatures and surface soil moistures. Soil water
content at a depth of 0 to 10 cm was identified as the key environmental factor affecting the variation in
soil respiration in the steppe. In contrast, in desert shrub and shrub-perennial communities, the dynamics
of soil respiration was significantly influenced by air temperature. Similarly, the various responses of
soil respiration to environmental factors may be attributed to the different soil textures and distribution
patterns of plant roots. In desert ecosystems, precipitation results in soil respiration pulses. Soil carbon
dioxide (CO2) effluxes greatly increased after rainfall rewetting in all of the ecosystems under study.
However, the precipitation pulse effect differed across the ecosystem. We propose that this may be a result
of a reverse effect from the soil texture. |
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Keywords: | soil respiration grass-desert shrub transition Stipa bungeana Artemisia ordosica Artemisia ordosica Cynanchum komarovii Ordos Plateau |
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