Abstract
This study explored the spatiotemporal variability of rangeland NPP in response to drought in Chaharmahal and Bakhtiari province, Iran, from 2000 to 2016 using the Carnegie Ames Stanford Application (CASA) model and Standardized Palmer Drought Index (SPDI). The spatial distribution of NPP and Light Use Efficiency(LUE) values, especially during dry years, indicated a larger dwindling rate for annual NPP and LUE in poor and very poor conditions compared to fair and good rangelands. During the nine-year drought period (2008–2016), NPP decreased across all rangelands, with the highest average of 5.14 g C/(m2.a) and maximum of 6.42 g C/(m2.a) in annual grass-annual forb and the lowest of 0.95 g C/(m2.a) in the Daphne-Astragalus type. The correlation between SPDI and NPP varied from R2 > 0.85 (p 0.01) among the rangeland types. The highest and the lowest sensitivity to drought were observed in the annual plants and shrublands, respectively.
Published Version
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