Microbial necromass under global change and implications for soil organic matter

环境科学 土壤有机质 土壤碳 有机质 营养物 氮气循环 微生物 环境化学 全球变化 氮气 全球变暖 碳循环 农学 生态系统 化学 气候变化 土壤科学 生态学 土壤水分 细菌 生物 有机化学 遗传学
作者
Junxi Hu,Meilin Du,Jun Chen,Liehua Tie,Shixing Zhou,Kate M. Buckeridge,Johannes H. C. Cornelissen,Congde Huang,Yakov Kuzyakov
出处
期刊:Global Change Biology [Wiley]
卷期号:29 (12): 3503-3515 被引量:29
标识
DOI:10.1111/gcb.16676
摘要

Abstract Microbial necromass is an important source and component of soil organic matter (SOM), especially within the most stable pools. Global change factors such as anthropogenic nitrogen (N), phosphorus (P), and potassium (K) inputs, climate warming, elevated atmospheric carbon dioxide (eCO 2 ), and periodic precipitation reduction (drought) strongly affect soil microorganisms and consequently, influence microbial necromass formation. The impacts of these global change factors on microbial necromass are poorly understood despite their critical role in the cycling and sequestration of soil carbon (C) and nutrients. Here, we conducted a meta‐analysis to reveal general patterns of the effects of nutrient addition, warming, eCO 2 , and drought on amino sugars (biomarkers of microbial necromass) in soils under croplands, forests, and grasslands. Nitrogen addition combined with P and K increased the content of fungal (+21%), bacterial (+22%), and total amino sugars (+9%), consequently leading to increased SOM formation. Nitrogen addition alone increased solely bacterial necromass (+10%) because the decrease of N limitation stimulated bacterial more than fungal growth. Warming increased bacterial necromass, because bacteria have competitive advantages at high temperatures compared to fungi. Other global change factors (P and NP addition, eCO 2 , and drought) had minor effects on microbial necromass because of: (i) compensation of the impacts by opposite processes, and (ii) the short duration of experiments compared to the slow microbial necromass turnover. Future studies should focus on: (i) the stronger response of bacterial necromass to N addition and warming compared to that of fungi, and (ii) the increased microbial necromass contribution to SOM accumulation and stability under NPK fertilization, and thereby for negative feedback to climate warming.
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