TY - JOUR
T1 - The impact of agricultural land use on the linkages between soil microbial communities and agroecosystem functioning is depth-dependent
AU - Cao, Wenchao
AU - Zou, Yukun
AU - Li, Gang
AU - Shan, Ying
AU - Wang, Jinchuang
AU - Singh, Brajesh Kumar
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2025/2/28
Y1 - 2025/2/28
N2 - Soil carbon (C) and nitrogen (N) mineralization rates are critical indicators of ecosystem functioning in agricultural land. However, the effects of agricultural land use on the interactions between soil C and N mineralization at different soil depths, especially in tropical regions, are poorly understood. Here, a longan orchard (LO) was converted to a conventional tea plantation (CTP) and an organic tea plantation (OTP) in the tropical region of China, and the responses of fungal and bacterial communities to these changes were assessed. The characteristics of the microbial communities, enzyme activities, and N and C mineralization rates were evaluated in response to the changes in land use. It was found that LO and OTP had faster N and C mineralization rates than CTP in surface soil. However, in subsurface soil, LO and OTP showed a faster C mineralization rate and a slower N mineralization rate than CTP. Structural equation modeling revealed that pH and C/N were the most crucial factors affecting N and C mineralization rates in surface soil. In contrast,soil bacterial and fungal community structures were the principal drivers of both the C and N mineralization in subsurface soil. Although soil C and net N mineralization were positively correlated in surface soil, this was not seen in subsurface soil. Collectively, this study demonstrated that differential drivers and their effects on the interactions between soil C and N mineralization at different soil depths should be considered for more accurate prediction of soil C and N dynamics under land-use changes.
AB - Soil carbon (C) and nitrogen (N) mineralization rates are critical indicators of ecosystem functioning in agricultural land. However, the effects of agricultural land use on the interactions between soil C and N mineralization at different soil depths, especially in tropical regions, are poorly understood. Here, a longan orchard (LO) was converted to a conventional tea plantation (CTP) and an organic tea plantation (OTP) in the tropical region of China, and the responses of fungal and bacterial communities to these changes were assessed. The characteristics of the microbial communities, enzyme activities, and N and C mineralization rates were evaluated in response to the changes in land use. It was found that LO and OTP had faster N and C mineralization rates than CTP in surface soil. However, in subsurface soil, LO and OTP showed a faster C mineralization rate and a slower N mineralization rate than CTP. Structural equation modeling revealed that pH and C/N were the most crucial factors affecting N and C mineralization rates in surface soil. In contrast,soil bacterial and fungal community structures were the principal drivers of both the C and N mineralization in subsurface soil. Although soil C and net N mineralization were positively correlated in surface soil, this was not seen in subsurface soil. Collectively, this study demonstrated that differential drivers and their effects on the interactions between soil C and N mineralization at different soil depths should be considered for more accurate prediction of soil C and N dynamics under land-use changes.
KW - C mineralization
KW - Deep soil
KW - Extracellular enzyme activities
KW - Net N mineralization
KW - Soil microorganisms
KW - Soil organic carbon
UR - http://www.scopus.com/inward/record.url?scp=85206667151&partnerID=8YFLogxK
U2 - 10.1016/j.agee.2024.109330
DO - 10.1016/j.agee.2024.109330
M3 - Article
AN - SCOPUS:85206667151
SN - 0167-8809
VL - 379
JO - Agriculture , Ecosystems and Environment
JF - Agriculture , Ecosystems and Environment
M1 - 109330
ER -