生态环境学报Issue(7)：1099-1104,6.
气候变化和种子萌发特性对轮叶马先蒿种群扩张的影响
Impacts of climatic changes as well as seed germination characteristics on the population expansion of Pedicularis verticillata
摘要
Abstract
Pedicularis verticillata is a kind of root hemiparasite, which has recently been expanding in Bayanbulak Grassland of Xinjiang, and reducing productivity of grassland. Hence, threatening the utilization and development of local animal husbandry industry. In this research, we focused on the patterns of climatic change in past 30 years and the effect of temperature on seed germination. We then analyzed the reasons for population expansion of P.verticillatain along the Bayanbulak Grassland. The results showed:1) during 1980 to 2010, the mean, maximum and minimum temperature was increased with the rate of 0.3 ℃ each 10 years. The rate of effective accumulate temperature in the growing season of P. verticillata increased by about 48.755 ℃ (10 a) and per annual increased at 61.469 ℃ (10 a). Precipitation was increased significantly during the growth stage of P. verticillata. It indicated that the climate in Bayanbulak Grassland was getting warmer and wetter. 2) Seed of P. verticillata has the phenomena of dormancy cycle, which is an adaptation to the changeful alpine climate. Germination rate was significantly increased with the rise in temperature. Seeds stored in root temperature germinated highest in 3/16 ℃ and 5/20 ℃, and the germination rate was more than 50%. After moist-chilling, seed germination rate of P. verticillata also improved with the increase in temperature, but only up to (44.44±2.94)%in 5/20 ℃. 3) The “warm-wet”trend may facilitate seed germination and dispersal, contributing to the population expansion of P. verticillata.关键词
马先蒿/根部半寄生植物/气候变化/种群扩张/萌发率Key words
Pedicularis/hemiparasitic plant/climate change/population expansion/germination rate分类
农业科技引用本文复制引用
隋晓琳,李爱荣,管开云..气候变化和种子萌发特性对轮叶马先蒿种群扩张的影响[J].生态环境学报,2013,(7):1099-1104,6.基金项目
国家自然科学基金项目（30970288）；云南省自然科学基金项目（2009CD114）；中国科学院青年创新促进会项目 （）
