中文摘要：

目的：研究甘肃岷县不同海拔对当归光合产物积累和分配格局的影响,为扩大当归适宜生态区提供理论参考。方法：采用田间试验,研究2 300 m～2 800 m海拔范围内不同梯度下当归光合产物积累规律和分配格局。结果：9月25日前,光合产物积累总量随海拔升高而降低,依次为176 g/株、166 g/株和128 g/株,且低海拔和中海拔显著高于高海拔（P〈0.05）,9月25日后,中海拔分别比低海拔和高海拔高13.9%和11.1%,差异显著（P〈0.05）;当归光合产物积累速率也存在明显海拔效应,高海拔（46.7%）和中海拔（43.7%）间无显著差异,但均显著高于低海拔（33.1%）;干物质向根中分配比例超过30%的时间不同,高海拔较其他2个海拔提前10 d,并且后期分配比例（约54%）高于其他2个海拔（49.8%～50.9%）,这为采收期当归产量形成奠定基础;药材产量从高到底依次为：中海拔（28.4 g/plant）、高海拔（26.6 g/plant）和低海拔（21.8 g/plant）,中海拔和高海拔分别比低海拔高30.2%和22.2%,差异显著（P〈0.05）,这与光合产物积累速率结果一致。结论：海拔通过改变光合产物分配格局和干物质积累速率而影响产量形成,故适当升高种植海拔有利于光合产物向根分配,进而提高当归药材产量,这为产区扩大当归适宜生态区提供理论参考。

英文摘要：

Objective： To study the effect of altitudes on the photosynthate accumulation and distribation pathern of Angelic sinensis in Gansu province and provide theontical for its expanding ecological planting region.Methods： Used field test to study the photosynthate accumulation and distribution pattern of Angelic sinensis on three different altitudinal gradients from 2 300 m to 2 800 m.Results：Before September 25,total photosynthate accumulation were decreased with the increasing of elevation,which amaunt was 176 g/plant,166 g/plant and 128 g/plant,respectively.The total photosynthate of low-altitude and middle-altitude were significantly higher than that of high-altitude（P0.05）.After September 25,middle-altitude was significantly higher than the other two altitudes（P0.05）,respectively,by 13.9% and 11.1%.The photosynthate accumulation rate existed the altitude effects,there was no significant difference between high-altitude（46.7%）and middle-altitude（43.7%）,but they were even significantly higher than that of low-altitude（33.1%）.The root distribution proportion（30%） existed the difference,that of high-altitude was 10 days earlier than the other two altitudes,and later that of high-altitude（about 54%） was higher than the other two altitudes（49.8%～50.9%）,it laid the foundation for yield formation.Yield of Angelic sinensis was as follows： middle-altitude（28.4 g/ plant）,high-altitude（26.6 g/plant） and low-altitude（21.8 g/plant）.Yield of Angelic sinensis middle-altitude and high-altitude were higher than that of low-altitude,respectively,by 30.2 %and 22.2%,and it had a significant difference（P0.05）,this result was consistent with the photosynthate accumulation rate.Conclusion： Altitudinal gradients affect yield formation of Angelic sinensis by changing the photosynthat distribution pattern and dry matter accumulation rate.So by appropriately increasing altitude,the root distribution proportion and yield are improved,this provides theoretical reference for expandin