Root exudates with low C/N ratios accelerate CO 2 emissions from paddy soil

2022 ◽  
Author(s):  
Guan Cai ◽  
Muhammad Shahbaz ◽  
Tida Ge ◽  
Yajun Hu ◽  
Baozhen Li ◽  
...  
Keyword(s):  
Root Exudates ◽  
Paddy Soil

Effects of different stoichiometric ratios on mineralisation of root exudates and its priming effect in paddy soil

2020 ◽  
Vol 743 ◽  
pp. 140808
Author(s):  
Linsen Du ◽  
Zhenke Zhu ◽  
Yanting Qi ◽  
Dongsheng Zou ◽  
Guolin Zhang ◽  
...  
Keyword(s):  
Root Exudates ◽  
Paddy Soil ◽  
Priming Effect ◽  
Stoichiometric Ratios

scholarly journals Different root exudates C/N ratios accelerate CO2 emission from paddy soil

2021 ◽  
Author(s):  
Guan Cai ◽  
Muhammad Shahbaz ◽  
Tida Ge ◽  
yajun Hu ◽  
Baozhen Li ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Root Exudates ◽  
Paddy Soil ◽  
Co2 Emission ◽  
Extracellular Enzymes ◽  
High Energy ◽  
Organic N ◽  
C Mineralization ◽  
Organic C ◽  
Stoichiometric Ratios

Root exudates can greatly modify microbial activity and soil organic matter (SOM) mineralization. However, the mechanism of root exudation and its stoichiometric ratio of C/N controlling upon paddy soil C mineralization are poorly understand. In this study, we used a mixture of glucose, oxalic acid, and alanine as root exudate mimics, employing three C/N stoichiometric ratios (CN6, CN10, and CN80) to explore the underlying mechanisms involved in C mineralization. The input of root exudates enhanced CO2 emission by 1.8–2.3-fold than that of the control. Artificial root exudates with low C/N ratios (CN6 and CN10) increased the metabolic quotient (qCO2) by 12% over those obtained at higher stoichiometric ratios (CN80 and C-only), suggesting a relatively high energy demand for microorganisms to acquire organic N from SOM by increasing N-hydrolase production. The stoichiometric ratios of enzymes (β-1,4-glucosidase to β-1,4-N-acetyl glucosaminidase) promoting organic C degradation compared to those involved in organic N degradation showed a significant positive correlation with qCO2; the stoichiometric ratios of microbial biomass (MBC/MBN) were positively correlated with carbon use efficiency. This suggests that root exudates with higher C/N ratios entail an undersupply of N for microorganisms, triggering the release of N-degrading extracellular enzymes. This in turn decreases SOM mineralization, implying the C/N ratio of root exudates to be a controlling factor. Our findings show that the C/N stoichiometry of root exudates controls C mineralization by the specific response of the microbial biomass through the release of C- and N-releasing extracellular enzymes to adjust for the microbial C/N ratio.

Effect of long-term fertilization on archaeal community structure in cal-careous purplish paddy soil

2011 ◽  
Vol 19 (3) ◽  
pp. 369-376
Author(s):  
Gu Yunfu ◽  
Zhang Xiaoping ◽  
Tu Shihua ◽  
Lindström Kristina
Keyword(s):  
Community Structure ◽  
Paddy Soil ◽  
Archaeal Community

Diversity of Microbial Community of Paddy Soil Types in Double-Rice Crop-ping System

2010 ◽  
Vol 36 (5) ◽  
pp. 826-832
Author(s):  
Chuan-Deng YI ◽  
Li-Hong WANG ◽  
Xiao-Ping XIAO ◽  
Guang-Li YANG ◽  
Yue-Gao HU ◽  
...  
Keyword(s):  
Microbial Community ◽  
Paddy Soil ◽  
Rice Crop ◽  
Soil Types ◽  
Double Rice

Influence of Long-term Fertilizations on Nutrients and Fungal Communities in Typical Paddy Soil of South China

2017 ◽  
Vol 43 (2) ◽  
pp. 286 ◽  
Author(s):  
Dan-Mei CHEN ◽  
Ling YUAN ◽  
Jian-Guo HUANG ◽  
Jian-Hua JI ◽  
Hong-Qian HOU ◽  
...  
Keyword(s):  
South China ◽  
Paddy Soil ◽  
Fungal Communities

Effect of microelement deficiency on root exudates of ginseng

2009 ◽  
Vol 17 (1) ◽  
pp. 64-69
Author(s):  
Yong LI ◽  
Xiao-Fang HUANG ◽  
Wan-Long DING
Keyword(s):  
Root Exudates

Critical Coagulation Concentration of Paddy Soil Clays in Sodium–Ferrous Iron Electrolyte

2004 ◽  
Vol 68 (3) ◽  
pp. 789 ◽  
Author(s):  
Atinut Saejiew ◽  
Olivier Grunberger ◽  
Somsri Arunin ◽  
Fabienne Favre ◽  
Daniel Tessier ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Ferrous Iron ◽  
Critical Coagulation Concentration ◽  
Soil Clays
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