A method for data downscaling in estimations of food-provisioning service in a mountainous region
2019
Li, Yuxiang | Duan, Xingwu | Li, Ya | Li, Yawen | Pan, Xi
The food provisioning service (FPS) represented by grain yield is strongly affected by the slope and soil and water conservation (SWC) measures in a mountainous region. Current FPS assessment methods mainly depend on regional census statistical data and do not take the local variability in slope and SWC measures into consideration, which may lead to errors. Based on field monitoring, this study qualified the relationship between slopes, SWC measures, and crop yield, and proposed a data downscaling method (DDM) to estimate FPS in a mountainous region. The results showed that corn yield per hectare (CYPH) was negatively related to slope; a one-degree increase in slope resulted in a 267 kg∙ha-1 decrease in CYPH on farmland without SWC measures (FWOM) and a 336 kg∙ha-1 decrease in farmland with SWC measures (FWM). Although FWOM accounted for 52.47% of the total farmland in the study area, it only provided 29.86% of FPS. FWM on a slope < 15° was the key area for providing FPS, which indicated that the traditional FPS assessment method (using the census statistical data) was inaccurate compared with DDM. DDM can help to improve the accuracy of ecosystem services assessment and trade-off analyses, and thus contribute to more targeted land use planning in a mountainous region.
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