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国际森林土壤研讨会课件2015-10-26 fuzhou biao zhu宣讲培训.pptx

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Rhizosphere priming effects in response to soil temperature and moisture dynamics
Biao Zhu (朱彪) – Peking University
. Huang, A. Concilio, . Cheng – UC Santa Cruz
C. Pries, C. Castanha, . Curtis, . Torn – LBNL
Outline
Rhizosphere priming effect
Growth chamber exp 1: soil warming
Greenhouse exp 2: soil drying-wetting
Field exp 1: warming and altered rainfall
Field exp 2: whole-profile soil warming
Summary
Rhizosphere priming effect (RPE)
Kuzyakov 2002, JPNSS
RPE is important for SOM position
35 observations from 13 studies
Zhu & Cheng 2011, GCB
Outline
Rhizosphere priming
Growth chamber exp 1: soil warming
Greenhouse exp 2: soil drying-wetting
Field exp 1: warming and altered rainfall
Field exp 2: whole-profile soil warming
Summary
RPE led to higher Q10 of SOM position
Zhu and Cheng, 2011, GCB
Sunflower and soybean, A sandy loam (Alfisol)
51-57 days, vegetative and flowering stage, - oC warming
No-plant control, constant moisture (25%)
Sunflower, constant moisture (25%)
Sunflower, severe drying-wetting (8-25%)
Soybean, constant moisture (25%)
Soybean, moderate drying-wetting (16-25%)
The continuous 13C-labeling greenhouse ([CO2] = 400ppm, δ13C = -18‰) at UCSC (Cheng and Dijkstra, 2007)

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