关键词: 塔克拉玛干沙漠腹地, 土壤微生物, 土壤因子, 咸水灌溉

Abstract: Calliptamus italicus is a predominant pest on Xinjiang grassland. In this paper, GS-MS and olfactometer were applied to study the selection mechanisms of C. italicus on its host plants Artemisia frigida, Seriphidium santolinum, Medicago falccata, and Melilotus officinali. The results showed that terpenoid and alcoholic compounds were the main volatile substances in the four host plants. The terpenoid content in A. frigida, S. santolinum, M. falccata, and M. officinal was 51.76%, 9.00%, 20.52%, and 19.46%, and the alcoholic compounds content was 1.74%, 20.26%, 16.80% and 33.48%, respectively. Different host plants had different attraction effect on C. italicus, with the attraction rate of A. frigida, S. santolinum, M. falccata, and M. officinali being 56.00%, 36.12%, 30.47%, and 10.00%, respectively. Statistical analysis indicated that the host plant biomass eaten by C. italicus was negatively correlated with the flavone content in host plants (r=-0.601). C. italicus preferred A. frigida, in which, the flavone content was the lowest, and repelled M. officinali, in which, the flavone content was the highest. It was suggested that the terpenoid in host plants had obvious attraction effect to C. italicus, while the alcoholic compounds and flavone contents had obvious repellent effect.

Key words: Hinterland of Takilimakan Desert, Soil microorganisms, Soil factors, Irrigating by salt water