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Temperature, Moisture, Hyperspectral Vegetation Indexes, and Leaf Traits Regulated Soil Respiration in Different Crop Planting Fields

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Abstract

The purpose of the study was to investigate how the regulatory factors (i.e., temperature, moisture, vegetation indexes, and leaf traits) of soil respiration differed in the different croplands. A field study including 2019 soybean, maize, and sweet potato and 2020 peanut, pea, and sesame growing seasons was performed. The soil respiration, soil temperature, moisture, hyperspectral vegetation indexes, leaf area index (LAI), and chlorophyll content (SPAD value) were measured. The seasonal cumulative soil respiration was 0.523 ± 0.040, 0.383 ± 0.029, 0.358 ± 0.018, 0.561 ± 0.010, 0.570 ± 0.017, and 0.586 ± 0.028 kg C m−2 in the soybean, maize, sweet potato, peanut, pea, and sesame croplands, respectively. Soil respiration was significantly (P < 0.05) lower in the maize and sweet potato croplands than in the soybean cropland in 2019, but the effects between croplands were not significant (P > 0.05) in 2020. The main regulatory factors of soil respiration were temperature, normalized difference vegetation index (NDVI), difference vegetation index (DVI), and SPAD value in the soybean and maize croplands, while they were temperature, NDVI, photochemical reflectance index (PRI), and LAI in the sweet potato, peanut, pea, and sesame croplands. A model based on soil temperature, hyperspectral vegetation indexes, and LAI (or SPAD value) explained 77.2‒89.1% of the variation in soil respiration in the soybean, maize, peanut, pea, and sesame croplands. This study demonstrated the potential applicability of vegetation indexes, LAI, and SPAD value in estimating soil respiration in different croplands at a large scale.

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Funding

The study was funded by the National Natural Science Foundation of China (NSFC 41775151).

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Correspondence to Shutao Chen.

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The authors declare no competing interests.

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Yao, X., Chen, S., Ding, S. et al. Temperature, Moisture, Hyperspectral Vegetation Indexes, and Leaf Traits Regulated Soil Respiration in Different Crop Planting Fields. J Soil Sci Plant Nutr 21, 3203–3220 (2021). https://doi.org/10.1007/s42729-021-00600-2

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  • DOI: https://doi.org/10.1007/s42729-021-00600-2

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