Abstract:

Maijishan scenic area ,Gansu province is an important component of biological diversity and representatives of the western ecotone of Qingling range. Walnut (Juglans regia L.) in Maijishan scenic area is native and has a long cultivation history. The seventeen walnut trees selected in Maijishan scenic area were empolyed to study the nut quality of the area comparing with seven walnut trees selected in Taishan and two cultivars. It was showed that the nut of walnut in Maijishan scenic area was smaller than that in Taishan. The average nut weight of walnut in Maijishan scenic area and in Taishan were 9.98g and 22.49g respectively. The average of nut weight，thickness of shell ，horizontal diameter and horizontal diameter of suture of walnut in Taishan were higher than that of walnut in Maijishan significantly at P＜0.01, the average of vertical diameter of walnut in Taishan was higher than that of walnut in Maijishan significantly at P＜0.05，but the kernel ratio was lower than that of walnut in Maijishan significantly at P＜0.01. There was no significant difference in the average content of fat and protein of walnut between in Maijishan and in Taishan , but there were differences in the content of fat and protein among walnut trees selected in Maijishan and Taishan significantly at P＜0.01. The content of fat of Maijishan elite tree GS-17 was the highest (70.24%), the content of protien of Maijishan elite tree GS-12 was 20.31%.There were no significant differences in composition of fatty acids and amino acids of walnut trees selected in Maijishan and Taishan , but the composition of essential amino acids of all selected walnut trees was higher than that was published by the USDA National Nutrition Database. This research laid scientific basis for the useing of walnut resources in Maijishan scenic area .