Resource of Dactylis glomerata in the transverse mountainous area in the southwest China
There is an abundant resource of Dactylis glomerata L.in the transverse mountainous area in the southwest of China, including two subspecies D.glomerata L subsp.Glomerata and D.glomerata subsp.H imalayensis, the former as tetraploid and the latter as diploid.D.glomerata subsp.H imalayensis distributes mainly in Qinghai‐Tibetan plateau and transverse mountainous area in the southwest China in Himalayas over N250 latitude with elevation between 1000m and 4500m, covering Tibetan autonomous region, Sichuan, Yunnan and Guizhou provinces.It is usually seen in the edge of forest and grassland in cold temperate and mid temperate zone with elevation between 1800m and 3500m.It can be found in all kinds of vegetations as associated species rather than a main or dominant species in the natural grassland.Considering the broad geographical distribution, natural distribution of D.glomerata subsp.H imalayensis is characterized by a continuum.However, discontinuous distribution of the species can be found, due to isolated evolution in part of the area because of the intricacy of landform and diversity of climate in the transverse mountains, in addition, the interruption of human activities that caused vegetation damage.D.glomerata L., generally speaking, is more widely distributed in southwest China with lower elevation from 800m to 3500m, compared with D.glomerata subsp.H imalayensis.D.glomerata L.is scattered in a small area with less regional dominance than D.glomerata subsp.H imalayensis, usually seen on the places with frequent human activities such as the side of road, grassland and cropping field, even performing as a dominant species in some areas.Sometimes the subspecies of D.are mixed together in the same area in the mid temperate and cold temperate zone with elevation from 1500m to 3500m.Yet, the concrete evidence has not been observed that the two subspecies are formed a transition by natural crossbreeding.
Dactylis glomerata L. resource transverse mountains .
Zhong Sheng Xue Shi-ming Huang Bizhi
Yunnan Beef Cattle and Pasture Research Center,Kunming 650212,China
国际会议
呼和浩特
英文
2008-06-29（万方平台首次上网日期，不代表论文的发表时间）