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| Titel |
Temporal variations of soil respiration in a moso bamboo (Phyllostachys pubescens) forest in central Taiwan |
| VerfasserIn |
I-Fang Hsieh, Tomonori Kume, Po-Ju Ke, Ya-Nan Wang, Chih-Yuan Hung |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073540
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| Zusammenfassung |
| Understanding soil respiration (Rs) in moso bamboo stands is crucial for accessing potential
impact of bamboo invasion on terrestrial carbon cycle in Asian regions. We aimed to evaluate
the seasonal and diurnal variations of Rs in a moso bamboo (Phyllostachys pubescens)
forest in central Taiwan with their abiotic drivers. We selected a 200m2 plot in a
conservatively managed moso bamboo stand in Natinal Taiwan University Forest,
central Taiwan. The 20 measuring locations were set in a 200m2 plot, in which we
inserted a 5-cm collar for Rs measurement. Rs rates were measured from April
2012 to February 2013 by using a closed dynamic chamber system. Once a month,
we observed the Rs averaged over the 20 locations and the diurnal variation at 2
locations with soil temperature (Ts) and soil volumetric water contents (SWC)
measurements. Over 10-month observation, results showed the highest Rs and the most
significant spatial variations in Rs in the summer seasons with maximum Rs averaged
over 20 locations of 4 - 8.36 μmol m-2s-1. Seasonal variations of the Rs were
considerably corresponded to both Ts and SWC with different patterns. The relationship
between Rs and Ts can be described with the exponential Q10 function, in which a
comparatively higher Q10 value of 6.45 was estimated than that of previous averages
(= 2 to 3). The Rs-SWC relationship shows that soil respiration increased with
increases in SWC of below 45%, while the Rs declined with increases in SWC
of over 45%. Also, Rs occasionally showed distinctive diurnal variations. In the
measurement campaign of June, we found the maximum Rs rate exceed twice the
minimum rate (from 3.43 to 9.91 μmol m-2s-1). Ts variation is likely to explain the
diurnal variation of Rs rather than SWC. Based on the trenching and root exclusion
methods, we also quantified partitioning Rs into autotrophic and heterotrophic
sources. Further, we discussed characteristics of Rs in the moso bamboo forest by
comparing with those of previous literatures in other types of forested ecosystems. |
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