Response and feedback of C mineralization to P availability driven by soil microorganisms

矿化(土壤科学) 土壤水分 化学 微生物 孵化 微生物种群生物学 土壤呼吸 营养物 环境化学 耕地 农学 动物科学 生态学 生物 细菌 生物化学 遗传学 有机化学 农业
作者
Zhongwang Jing,Ruirui Chen,Shiping Wei,Youzhi Feng,Jiabao Zhang,Xiangui Lin
出处
期刊:Soil Biology & Biochemistry [Elsevier BV]
卷期号:105: 111-120 被引量:98
标识
DOI:10.1016/j.soilbio.2016.11.014
摘要

Despite our current understanding of soil C and N interactions, less is known about the response and feedback of C mineralization to soil P availability driven by microorganisms. To better understand these interactions, soils with long-term P-sufficient NPK fertilization (available P: 13.4 mg kg−1) and P-deficient NK fertilization (available P: 0.96 mg kg−1) were incubated with and without glucose. CO2 emissions were monitored to characterize C mineralization during the incubation. The soil bacterial community structure, quantity and metabolic activity were evaluated using high-throughput sequencing, qPCR and microcalorimetric dynamics. Compared with P-sufficient soils, P-deficient soils had significantly lower basal respiration, but a significantly higher net mineralization of added glucose, probably due to higher energy cost of soil microorganisms. Glucose addition promoted microbial biomass and activity, particularly in P-deficient soils, and this improvement was maintained for at least 70 days. Shifts in bacterial community composition were induced by a predominance of several specific taxonomic groups, all of which were capable of solubilizing P in soils. P-deficiency decreases the retention of exogenous labile C into soil. Adding labile C to P-deficient soils may shift P from relatively unavailable soil-bound pools into microbial biomass pools through pool cycling. Our results indicated negative effects of P-deficiency on soil C retention, as well as positive effects of labile C on soil P availability in arable soils.
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