作者
Muhammad Shahbaz, Yakov Kuzyakov, Muhammad Sanaullah, Felix Heitkamp, Vladimir Zelenev, Amit Kumar, Evgenia Blagodatskaya
发表日期
2017/4
期刊
Biology and Fertility of Soils
卷号
53
页码范围
287-301
出版商
Springer Berlin Heidelberg
简介
Crop residue quality and quantity have contrasting effects on soil organic matter (SOM) decomposition, but the mechanisms explaining such priming effect (PE) are still elusive. To reveal the role of residue quality and quantity in SOM priming, we applied two rates (5.4–10.8 g kg−1) of 13C-labeled wheat residues (separately: leaves, stems, roots) to soil and incubated for 120 days. To distinguish PE mechanisms, labeled C was traced in CO2 efflux and in microbial biomass and enzyme activities (involved in C, N, and P cycles) were measured during the incubation period. Regardless of residue type, PE intensity declined with increasing C additions. Roots were least mineralized but caused up to 60% higher PE compared to leaves or stems. During intensive residue mineralization (first 2–3 weeks), the low or negative PE resulted from pool substitution. Thereafter (15–60 days), a large decline in microbial …
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M Shahbaz, Y Kuzyakov, M Sanaullah, F Heitkamp… - Biology and Fertility of Soils, 2017