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本文在野外调查的基础上 ,结合田间试验 ,用Shannon -Winener、Greerberg多样性指数和Pielal均匀度指数分析了西藏油菜的品种、表型、生境、垂直分布、地理分布的多样性。结果表明 :西藏油菜的品种多样性十分丰富 ,多样性指数和均匀度指数都较高 ,但不同生境、不同垂直高度及不同的地理范围存在着明显的差异。在海拔 35 0 0～ 42 0 0米的西藏中西部地区集中了西藏 93.81 %的油菜品种。在海拔 35 0 0米以下地区 ,随着海拔的升高 ,品种数量渐趋增多 ,在海拔 42 0 0米以上地区 ,随着海拔的升高 ,品种数量逐渐减少 ,表现出西藏油菜品种丰富的多样性和相对集中性。同时 ,提出西藏中西部地区可能是我国白菜型和芥菜型油菜起源地的观点。
Based on the field investigation and field experiments, the paper analyzed Shannon-Werner diversity, Greerberg diversity index and Pielal evenness index to analyze the variety, phenotype, habitat, vertical distribution and geographical distribution of Tibet rape. The results showed that: the variety of rapeseed in Tibet is very rich in diversity, diversity index and evenness index are high, but there are obvious differences in different habitats, different vertical altitudes and different geographic scope. 93.81% of the varieties of rapeseed in Tibet are concentrated in central and western Tibet at an altitude of 350 to 420 meters. In the area below 350 meters above sea level, the number of varieties increased with the elevation above sea level. With the elevation above 4200 meters, the number of varieties decreased gradually with the elevation above 3500 meters above sea level, showing the rich varieties of Tibet rape Diversity and relative concentration. At the same time, it is proposed that the central and western Tibet may be the origin of Chinese cabbage and B. juncea.