TY - JOUR

T1 - Nutrients addition regulates temperature sensitivity of maize straw mineralization

AU - Auwal, Muhammad

AU - Singh, Bhupinder Pal

AU - Chen, Zhiyi

AU - Kumar, Amit

AU - Pan, Shaotong

AU - Luo, Yu

AU - Xu, Jianming

PY - 2021/8/1

Y1 - 2021/8/1

N2 - Purpose: The study aimed to determine the interactive effect of temperature with nutrients on maize residues decomposition in soil. Materials and methods: We conducted an incubation of 87 days by applying maize straw (δ13C value of −11.2‰) to soil (δ13C value of −26.3‰) with low (N0), medium (NM), and high (NH) level of nutrients addition, at two temperature levels of 5 °C (T-L) and 25 °C (T-H). We measured the cumulative CO2-C efflux, residues decomposition, temperature sensitivity (Q10), and extracellular enzyme activities. Results and discussion: Increased temperature significantly increased cumulative CO2 efflux and straw decomposition, with an enhanced rate of active (Ka) and slow (Ks) pools of soil and residues C. The mean values of Q10 ranged from 1.4 to 1.6 for the total CO2 efflux and 1.4 to 1.7 for maize straw decomposition. The outcome might be due to temperature-dependent microbial activation at 25 °C. The activities of β-glucosidase, α-glucosidase, cellobiohydrolase, and β-xylosidase enzymes were positively correlated with cumulative CO2 emissions at 25 °C suggesting microbial regulation on SOM decomposition. We found a U-shaped pattern of nutrients regulation on the temperature sensitivity of maize straw decomposition, with the lowest Q10 under NM. Conclusions: Our findings suggest that nutrients regulated the temperature effects on residue C decomposition by adjusting microbial activity (extracellular enzyme activities). Consequently, it may lead to soil C sequestration under the current climate change scenario.

AB - Purpose: The study aimed to determine the interactive effect of temperature with nutrients on maize residues decomposition in soil. Materials and methods: We conducted an incubation of 87 days by applying maize straw (δ13C value of −11.2‰) to soil (δ13C value of −26.3‰) with low (N0), medium (NM), and high (NH) level of nutrients addition, at two temperature levels of 5 °C (T-L) and 25 °C (T-H). We measured the cumulative CO2-C efflux, residues decomposition, temperature sensitivity (Q10), and extracellular enzyme activities. Results and discussion: Increased temperature significantly increased cumulative CO2 efflux and straw decomposition, with an enhanced rate of active (Ka) and slow (Ks) pools of soil and residues C. The mean values of Q10 ranged from 1.4 to 1.6 for the total CO2 efflux and 1.4 to 1.7 for maize straw decomposition. The outcome might be due to temperature-dependent microbial activation at 25 °C. The activities of β-glucosidase, α-glucosidase, cellobiohydrolase, and β-xylosidase enzymes were positively correlated with cumulative CO2 emissions at 25 °C suggesting microbial regulation on SOM decomposition. We found a U-shaped pattern of nutrients regulation on the temperature sensitivity of maize straw decomposition, with the lowest Q10 under NM. Conclusions: Our findings suggest that nutrients regulated the temperature effects on residue C decomposition by adjusting microbial activity (extracellular enzyme activities). Consequently, it may lead to soil C sequestration under the current climate change scenario.

KW - Extracellular enzyme activity

KW - Nutrient availability

KW - Q

KW - Soil CO efflux

KW - SOM decomposition

KW - Ecosystems Research

UR - http://www.scopus.com/inward/record.url?scp=85106499331&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/dd8e1a40-109a-3e4f-a605-001ecbb87503/

U2 - 10.1007/s11368-021-02960-9

DO - 10.1007/s11368-021-02960-9

M3 - Journal articles

AN - SCOPUS:85106499331

VL - 21

SP - 2778

EP - 2790

JO - Journal of Soils and Sediments

JF - Journal of Soils and Sediments

SN - 1439-0108

IS - 8

ER -