Abstract
Climate change profoundly impacts agriculture system by changing variables such as rainfall, temperature, evapotranspiration,
soil water content, and water availability. Henan provinece is ranked top among other provincs in China for agricultural
production especially the winter wheat. As far, Climate change is affecting agricultural procedures greatly. Therefore, this
study was aimed to investigate the variability of climatic extremes and trends of climatic parameters in Dongwan watershed,
China. Twelve temperature (max. & min.) and ten precipitation extreme indices were calculated using the RClimDex toolkit.
Nonparametric Mann-Kendall trend test and Sen's slope (Q) estimator methods were applied to detect climate change trends
and their magnitudes. Inverse distance weighting (IDW) technique was used to patterned the spatial variations in climatic
variables. It was observed that the temperature increase showed a significant increase, especially the hot indices. Precipitation
indices were not substantial but for few stations and few indexes. In the trend analysis, it was found that the extreme max. The
temperature increased significantly during the study period. All through 1998-2014, the maximum temperature has amplified
by 1.1°C as compared to 1979-1997. Similarly, precipitation also has increased by 46 mm in the second time step compared
to the first. The change in temperature and precipitation may affect the crop water requirement, crop yield, and water
availability in the Dongwan river watershed, impacting the Luhun, Sanmenxia, Guxian, and Xiaolangdi reservoir operation
downstream
Muhammad Shafeeque, Muhammad Mannan Afzal, Li Qiaoling , Haseeb Akbar , Fazli Hameed , Yingchi Mao , Zhijia Li, Akhtar Ali. (2021) TRENDS OF PRECIPITATION AND TEMPERATURE EXTREMES AND CLIMATE VARIABILITY OVER DONGWAN WATERSHED, HENAN, CHINA, Pakistan Journal of Agricultural Sciences, Volume 58, Issue 1.
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