四川木里县木里河与水洛河流域鸟类资源变化调查

将2004年4~12月对木里县木里河、水洛河流域的鸟类调查结果与1928年美国博物学家约瑟夫.洛克(Joseph F Rock)在该区域内的鸟类调查记录比较,结果表明:①2004年调查的种类为123种,少于1928年调查记录139种,而且2004年调查的时间更长;②2004年调查鸟类群落的多样性指数和均匀度都小于1928年;③2004年调查鸟类的优势种有5种,常见种12种,主要为农耕-民居生境鸟类,1928年没有优势种,常见种有35种,主要为森林-灌丛生境鸟类;④鸟类区系构成没有产生大的变化。优势类群变化的主要原因是海拔3000m以下森林和灌丛生境受到干扰,蜕变为农耕地-民居生境,该区域的生境与1928年相比,已受到了破坏。

Avifauna Changes of Muli River Valley and Shuiluo River Valley in Muli County, Sichuan

Data on the avian fauna at the Muli River valley and Shuiluo River valley in Muli County,Sichuan were collcted from April to December 2004.The results of comparing our data with the data on avifauna in the same area collected by American naturalist Joseph F.Rock in 1928 shows that: 1) Although our investigation time was longer,only 123 species of birds were observed in 2004,less than Rock's 139 species in 1928.2) The species diversity and evenness of birds community were lower in 2004 than those in 1928.3) Our data suggested five species were dominant,twelve species were common. Most of the birds were house-farmland types.In contrast 35 species of common birds and no dominant species found by Rock,and almost all of the species of birds were shrub-forest types.4) No changes of avifauna had occurred during the last 76 years.Dominance of some species of birds might result from anthropological disturbances,which had changed shrub-forest habitat into house-farmland habitat below the elevation of 3000 m.Habitats in this area for birds had been damaged in 2004 compared with those in 1928.