Application of HJ-1 CCD data to analyze the growing-season variations of soil respiration in two irrigated cropland ecosystems

Soil respiration (R<sub>s</sub>) is a major CO<sub>2</sub> flux within terrestrial ecosystems. This study examine the feasibility of applying HJ-1 CCD data to analyze the growing-season variations of R<sub>s</sub> in two irrigated cropland ecosystems. At growing season time scale, crop biophysical parameters, such as leaf chlorophyll content (Chl<sub>leaf</sub>) and green leaf area index (GLAI), explained most R<sub>s</sub> variation in the maize and winter wheat fields. Among the selected vegetation indices from HJ-1 CCD data, enhanced vegetation index (EVI) and green chlorophyll index (CI<sub>green</sub>) showed stronger correlations with Chl<sub>leaf</sub> for maize or GLAI for winter wheat than normalized difference vegetation index (NDVI). Moreover, for both fields, the relationships between daily mean R<sub>s</sub> and either EVI or CI<sub>green</sub> was consistently stronger than the relationship between daily mean R<sub>s</sub> and NDVI.

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