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| Titel |
Reviews and syntheses: Soil resources and climate jointly drive variations in microbial biomass carbon and nitrogen in China's forest ecosystems |
| VerfasserIn |
Z. H. Zhou, C. K. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 22 ; Nr. 12, no. 22 (2015-11-26), S.6751-6760 |
| Datensatznummer |
250118179
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| Publikation (Nr.) |
 copernicus.org/bg-12-6751-2015.pdf |
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| Zusammenfassung |
| Microbial metabolism plays a key role in regulating the biogeochemical cycle
of forest ecosystems, but the mechanisms driving microbial growth are not
well understood. Here, we synthesized 689 measurements on soil microbial
biomass carbon (Cmic) and nitrogen (Nmic) and related parameters
from 207 independent studies published up to November 2014 across China's
forest ecosystems. Our objectives were to (1) examine patterns in
Cmic, Nmic, and microbial quotient (i.e., Cmic / Csoil and
Nmic / Nsoil rates) by climate zones and management regimes for
these forests; and (2) identify the factors driving the variability in the
Cmic, Nmic, and microbial quotient. There was a large variability in
Cmic (390.2 mg kg−1), Nmic (60.1 mg kg−1,
Cmic : Nmic ratio (8.25), Cmic / Csoil rate (1.92 %), and
Nmic / Nsoil rate (3.43 %) across China's forests. The natural
forests had significantly greater Cmic (514.1 mg kg−1 vs. 281.8 mg kg−1) and Nmic (82.6 mg kg−1 vs. 39.0 mg kg−1) than the
planted forests, but had less Cmic : Nmic ratio (7.3 vs. 9.2) and
Cmic / Csoil rate (1.7 % vs. 2.1 %). Soil resources and climate
together explained 24.4–40.7 % of these variations. The
Cmic : Nmic ratio declined slightly with Csoil : Nsoil ratio,
and changed with latitude, mean annual temperature and precipitation,
suggesting a plasticity of microbial carbon-nitrogen stoichiometry. The
Cmic / Csoil rate decreased with Csoil : Nsoil ratio,
whereas the Nmic / Nsoil rate increased with Csoil : Nsoil ratio; the former was influenced more by soil resources than by climate,
whereas the latter was influenced more by climate. These results suggest
that soil microbial assimilation of carbon and nitrogen are jointly driven
by soil resources and climate, but may be regulated by different mechanisms. |
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