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Effects of Latitude,Longitude and Altitude on Angelica Growth and Early Bolting in Medicine Formation Period

QIU Dai-yu1,LIN Hai-ming1,CHEN Yuan1,LI Ying-dong2,GUO Feng-xia1(1.Agronomy College of Gansu Agricultural University,Gansu,Lanzhou Province 730070,China;2.Gansu College of Traditional Chinese Medicine,Gansu,Lanzhou Province 730000,China)  
Based on field investigations of growth and early bolting rate of biennial angelica cultivated in 31 ecoregions of 4 counties of Gansu Province,the effects of altitude,longitude and latitude on angelica growth and early bolting at medicine formation period were investigated to provide theoretic evidence for determining Angelica planting ecoregion properly.Results showed significant geographical effects on both early bolting and growth of Angelica.Heteromorphosis was classified into following rank order: bolting rateplant heightleaf numbers.Plant height,leaf numbers and bolting rate had significantly negative correlations with altitude and longitude.However,all were significantly positive for latitude correlations.Multiple regression analysis showed that plant height,leaves and bolting rate had significant linear regression relationships with altitude.Results showed altitude as the main ecological factor influencing angelica growth and early bolting.Both height and bolting rate of angelica plants decreased significantly in high altitude areas.
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