| By using shelters to simulate 30% rainfall reduction(R-30%), normal rainfall(CK) and 30% rainfall increase(R+30%), we studied the changes of soil relative available water content, LAI, NDVI, biomass and yield for winter wheat within two growing seasons in Loess Plateau in China from 2016 to 2018. The results showed that the soil relative available water content declined rapidly; the NDVI decreased significantly; the LAI and biomass growth rate slowed down significantly, and wheat spike and 1 000-grain weight decreased significantly under R-30% treatment, in comparison with the CK treatment, in the normal precipitation of 2016-2017. Under R+30% treatment, LAI and biomass of winter wheat remained a steady growth advantage. Finally, the yield of winter wheat under R+30%, CK and R-30% treatments was 4.66, 3.12 and 2.43 t·hm-2, respectively. There were significant differences among all treatments. However, in wet year of 2017-2018, there was no significant changes in the soil relative available water content, LAI, canopy NDVI, biomass, yield and its components under different treatments. The yield of winter wheat under R+30%, CK and R-30% treatments were 3.70, 3.39 and 3.14 t·hm-2, respectively. Therefore, in normal precipitation year(530.2 mm precipitation), increasing precipitation by 30% can increase the yield of winter wheat by 44.2%, and decreasing precipitation by 30% can reduce the yield of winter wheat by 28.4%. In the wet years(713.9 mm precipitation), increasing 30% or decreasing 30% precipitation has no significant effect on growth and yield of winter wheat. |
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