Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL088553 |
A physical agricultural drought index based on root zone water availability: Model development and application | |
Meixian Liu; Alexander Y. Sun | |
2020-11-02 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
英文摘要 | Physical agricultural drought indices generally use soil moisture to represent root‐zone water availability (RZWA). The uncertainty in root‐zone properties, especially in deep‐rooting regions, may lead to significant uncertainty in the results. This study adopted a conceptual model that requires no specific root‐zone properties to model the RZWA. A RZWA‐based drought index (AgDI) was then developed by standardizing the root‐zone water deficit. A comparison over 20 catchments with different terrain and vegetation demonstrated the effectiveness of AgDI in characterizing agricultural droughts, with the correlations between vegetation indices [Normalized difference vegetation index (NDVI) and gross primary productivity (GPP)] and AgDI (mean ~0.54) being significantly higher than those between the same vegetation indices and the Palmer Drought Severity Index (PDSI, ~0.22), Standardized Precipitation‐Evapotranspiration Index (SPEI, ~0.33), and Standardized Soil moisture Index (SSI, ~0.37). Compared to the SSI, the AgDI was not equally advantageous everywhere, but it generally showed better performance in deep‐rooting regions. |
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/301789 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Meixian Liu,Alexander Y. Sun. A physical agricultural drought index based on root zone water availability: Model development and application[J]. Geophysical Research Letters,2020. |
APA | Meixian Liu,&Alexander Y. Sun.(2020).A physical agricultural drought index based on root zone water availability: Model development and application.Geophysical Research Letters. |
MLA | Meixian Liu,et al."A physical agricultural drought index based on root zone water availability: Model development and application".Geophysical Research Letters (2020). |
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