西藏青稞富含赖氨酸、淀粉、β-葡聚糖和蛋白质等营养成分，其含量与高原生态气候因子密切相关。2013-2015连续两年从西藏各地收集47份青稞农家种，记录当地生态气候因子，测定营养成分含量，进行数据分析。通过二次多项式逐步回归分析表明：温度是影响青稞赖氨酸含量的核心要素；日照时数越长，积温数越大，有利于青稞淀粉的含量；月平均气温与日平均气温≥0℃积温或与日照时数互作，有利于青稞β-葡聚糖的含量，月平均气温与日平均气温≥10℃积温或与年降水量互作不利于β-葡聚糖含量；月平均气温和日照时数互作有利于青稞蛋白质含量，海拔高度同月平均气温、积温互作不利于蛋白质的含量。通过典型相关分析表明：综合影响西藏青稞粗蛋白、β-葡聚糖和赖氨酸含量的最优关键高原生态气候因子是海拔高度、年降水量和日平均气温≥10℃积温的变量组合；综合影响西藏青稞淀粉、赖氨酸含量的最优关键高原生态气候因子是日平均气温≥0℃积温、≥10℃积温和年降水量。%Tibet naked barley (Hordeum vulgare Linn.var.nudum Hook.f.)is rich in nutrients,such as starch, lysine,β-glucan and protein,which are closely related to the ecological and climatic conditions unique to the plateau region.Forty-seven samples of the native varieties of naked barley were collected from parts of Tibet for this investigation during 2013 - 201 5. Local conditions at the sampling sites were recorded.A quadratic polynomial stepwise regression analysis indicated that the temperature was crucial in affecting the lysine content in the grains. The starch content increased with the increasing sunshine and accumulated temperature.The interaction between the monthly and daily average temperatures,when they were greater than 0℃,and the sun exposure facilitated the formation ofβ-glucan.On the other hand,when the monthly and daily average temperatures were higher than 10℃and the annual precipitation was abundant,their interaction became detrimental to β-glucan formation.For the protein content,the monthly mean temperature along with sunshine time was found to be beneficial,but not when the altitude was a factor associated with the monthly average temperature or the accumulated temperature.The canonical correlation analysis showed that the combination of altitude,annual precipitation and the accumulated temperature,when the average daily temperature was more than 10℃,were critical on the protein,lysine and β-glucan contents in the naked barley.Whereas,the combination of the accumulated temperature,when the average daily temperature was more than 0℃ or 10℃,and the annual precipitation affected most greatly on the starch and lysine contents in the naked barley.
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