Variation Analysis on Kernel Oil Content and Its Fatty Acid Composition in 31 Superior Amygdalus pedunculata Individuals from Mu Us Desert Composition Analysis of Amygdalus pedunculata Pall.Seed from Different Regions Studies on Drought Resistance of Different Regional Amygdalus pedunculata Pall. Leaf Anatomical Structures of Different Regional Amygdalus pedunculata Pall.and Their Drought Resistance Analysis Morphological Diversity and Correlativity Analysis of Nut Traits of Amygdalus pedunculata