Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | DOI10.1088/1748-9326/abc64d |
Understanding spatial variability of forage production in California grasslands: delineating climate, topography and soil controls | |
Han Liu; Yufang Jin; Leslie M Roche; Anthony T O’Geen; Randy A Dahlgren | |
2021-01-13 | |
发表期刊 | Environmental Research Letters
![]() |
出版年 | 2021/01/13 |
英文摘要 | Rangelands are a key global resource, providing a broad range of ecological services and economic benefits. California's predominantly annual rangelands cover ~12% of the state's land area, and the forage production is highly heterogeneous, making balancing economic (grazing), conservation (habitat) and environmental (erosion/water quality) objectives a big challenge. Herein, we examined how climate and environmental factors regulate annual grassland forage production spatially across the state and among four ecoregions using machine learning models. We estimated annual forage production at 30 m resolution over a 14 year period (2004–2017) using satellite images and data fusion techniques. Our satellite-based estimation agreed well with independent field measurements, with a R2 of 0.83 and RMSE of 682 kg ha−1. Forage production (14 year average) showed large spatial variability (2940 ± 934 kg ha-1 yr-1; CV = 35%) across the study area. The gradient boosted regression tree with 11 feature variables explained 67% of the variability in forage production across the state. Precipitation amount, especially in November (germination) and April (rapid growth), was found as the dominant driver for spatial variation in forage production, especially in drier ecoregions and during drier years. Seasonal distribution of precipitation and minimum air temperature showed a relatively stronger control on forage production in wetter regions and during wet years. Additionally, solar energy became more important in wetter ecoregions. Drought reduced forage production from the long-term mean, i.e. a 33% ± 19% decrease in production (2397 ± 926 kg ha-1yr-1; CV = 38%) resulting from a 29% ± 5% decrease in precipitation. The machine learning based spatial analysis using 'big data' provided insights on impacts of climate and environmental factors on forage production variation at various scales. This study demonstrates a cost-effective approach for rapid mapping and assessment of annual forage production with the potential for near real-time application. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/311306 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Han Liu,Yufang Jin,Leslie M Roche,et al. Understanding spatial variability of forage production in California grasslands: delineating climate, topography and soil controls[J]. Environmental Research Letters,2021. |
APA | Han Liu,Yufang Jin,Leslie M Roche,Anthony T O’Geen,&Randy A Dahlgren.(2021).Understanding spatial variability of forage production in California grasslands: delineating climate, topography and soil controls.Environmental Research Letters. |
MLA | Han Liu,et al."Understanding spatial variability of forage production in California grasslands: delineating climate, topography and soil controls".Environmental Research Letters (2021). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论