TITLE:
Temporal Dynamics of Standardized Precipitation Evapotranspiration Index and Its Influence to Summer Maize Yield from Kaifeng Region in He’nan Province
AUTHORS:
Kunyu Peng, Jianfeng Peng
KEYWORDS:
SPEI, Dry/Wet Periods, Maize Yield, Correlation Analysis, Kaifeng Region
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.5 No.12,
December
18,
2017
ABSTRACT: Many quantitative studies get more and more attention on drought occurrence and monitoring trends of drought change using different methods; however few studies involve correlation between drought and crop yield especially drought index. This study analyzed the climate change about annual mean SPEI-3, SPEI-6 and SPEI-12, of Kaifeng region in the period of 1961-2013. The SPEI-3 and SPEI-6 seasonal short timescales showed a decreasing tendency, especially rapidly a decline since 2004, and high-frequency alternate dry/wet periods occurred during 1961-2013. However, the annual timescale SPEI-12 showed almost no evidently rise/decline tendency but severity events of dry/wet episode aggravated in terms of duration and magnitude and remarkable low-frequency change. Correlation analysis results between maize yield from Kaifeng region and multi-month scale annual SPEI showed a high negative significant correlation with -0.689 (ρ ρ