β-glucan content spatial distribution characteristics of cultivated barley in Qinghai-Tibet Plateau were investigated based on the data measured from 83 sampling sites. The results showed that β-glucan content exhibited a macrocosm pattern of spatial distribution along the horizontal direction in Qinghai-Tibet Plateau, with staggered patches of different values. Two regions of higher β-glucan content were observed with centers of Guide and Tongde in Qinghai Province and Xiahe and Hezuo in Gansu Province (northeast), and Jiangzi, Bailang, Xietongmen, Shigatse, Lazi, Kangma, Gongga and Qushui in Tibet (southwest). Along the vertical direction, β-glucan content distribution pattern appeared with double peak curves. There were two high value zones between the altitudes from 2700 m to 3000 m and from 3600 m to 3900 m, with average β-glucan content value of (5.7±1.7)% and (4.6±1.1)%, respectively. Influencing factors of β-glucan content with importance value index more than 40.0% were as follows: grain color ＞ ear density ＞ average relative humidity in September ＞ soil available N content ＞ soil available K content ＞ average diurnal temperature range in June ＞ ≥10 ℃ accumulated temperature ＞ average annual temperature ＞ soil available P content ＞ average diurnal temperature range in September.
采用83个样点数据,研究了青藏高原栽培大麦β-葡聚糖含量的分布特征.结果表明: 在地理水平方向上,青藏高原栽培大麦β-葡聚糖含量总体呈现出斑块状交错分布的格局,并形成了以青海贵德、同德,甘肃夏河、合作为中心的青藏高原东北部和以西藏江孜、白朗、谢通门、日喀则、拉孜、康马、贡嘎、曲水为中心的青藏高原西南部等两个栽培大麦β-葡聚糖含量高值区;在地理垂直方向上,栽培大麦β-葡聚糖含量呈现出双峰曲线分布格局,在海拔2700～3000 m和3600～3900 m形成2个高峰区,这2个高峰区栽培大麦β-葡聚糖含量的平均值分别为(5.7±1.7)%和(4.6±1.1)%;对栽培大麦β-葡聚糖含量影响重要值指数在40.0%以上的因子依次是籽粒颜色>穗密度>9月平均相对湿度>土壤速效氮含量>土壤速效钾含量>6月平均气温日较差>≥10 ℃积温>年均气温>土壤速效磷含量>9月平均气温日较差.
Keywords: Qinghai-Tibet Plateau; cultivated barley; distribution characteristics; β-glucan.