Abstract
Total ecosystem respiration (TER) is the major contributor to atmospheric carbon inputs. Investigating the characteristics of cropland TER is essential for understanding the global carbon balance. To better understand the seasonal dynamics of eddy covariance system-based TER and chamber-based soil respiration (SR), as well as their controlling factors, we conducted an in-depth analysis of two-year summer maize and winter wheat rotation systems from June 2020 to June 2022 in the Guanzhong Plain combined with nonlinear regression and Person correlation. The average TER values of the summer maize and winter wheat growing seasons were 1164.0 and 672.7 \( \text{g C }{\text{m}}^{\text{-2}}\), respectively; in addition, the SR/TER ratios were 0.58 and 0.84, respectively. The average determination coefficients of the exponential curves of SR and soil temperature at the 10-cm depth (\( {\text{T}}_{\text{s10}}\)) over the summer maize and winter wheat growing seasons were 0.45 and 0.73, respectively; whereas the temperature sensitivities of SR (\( {\text{Q}}_{\text{10}}\)) were 2.56 and 2.05, respectively. Air temperature (\( {\text{T}}_{\text{air}}\text{),} {\text{T}}_{\text{s10}}\), and leaf area index (LAI) were the dominant controlling factors of TER in winter wheat growing seasons, while the dominant factor in summer maize seasons of TER was LAI. Moreover, \( {\text{T}}_{\text{air}}\) and \( {\text{T}}_{\text{s10}}\) were the main factors affecting the SR of the winter wheat growing seasons, followed by the LAI. Results showed a significant negative correlation between SR and LAI in the summer maize growing seasons (p < 0.01). This study provides theoretical support for an in-depth understanding of the mechanisms controlling carbon emissions from croplands in the Guanzhong Plain.
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Acknowledgements
This study was funded by the National Natural Science Foundation of China (Grant nos. 51879223, 52179046, and 42105119). We would like to thank MogoEdit (http://www.mogoedit.com/) for providing assistance during the preparation of this manuscript.
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Peng, X., Liu, X., Zhang, Q. et al. The Controlling Effects of Leaf Area Index on Soil Respiration and Total Ecosystem Respiration Over Summer Maize/Winter Wheat Cropland in the Guanzhong Plain, China. J Soil Sci Plant Nutr (2024). https://doi.org/10.1007/s42729-024-01697-x
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DOI: https://doi.org/10.1007/s42729-024-01697-x