Of Lake National Nature Reserve Of Adlai Was In Charge Of Adlai Was In Charge In The West Bank Of Lake Big Coat (buteo Hemilasius) Nest Site Selection

From March to July,2010and2011, the nest structure and nest-site selection of the UplandBuzzard (Buteo hemilasius) was investigated in West bank of Dalai Lake in Dalai Lake NaturalReserve，Inner Mongolia. Field observation found that the earliest activity of Upland Buzzardappeard on around March25；egg-laying began in the middle and late April and the breedingended at about the beginning of July. By the direct observation and plot sampling method in thefield，we positioned thirty nests, measured twenty ecological factors of this thirty samples. TheCluster Analysis based on the Euclidean distance and the distribution frequency statistics wereused to assess all twenty ecological factors. The nests are rough and no fixed shape, use the hardwooden structure to build the external outline and fixation firstly, then use bacillus, newspapersor even fishing nets and shabby clothes to filled internal in order to maintain the temperature.Through a rough measurement, the Upland Buzzard’s nest is characterized in that—the outer diameter is94.7±4.2cm while the inner diameter24.8±1.5cm; nest deep is14.0±0.9cm and nest height is46.1±2.7cm.The results of ecological factors analysis indicated that in West bank of Dalai Lake，Upland Buzzard’snests are mainly centralized distributed in the lake bank or blisters near the cliff；nesting sites are mainlymiddle or higher slope position；the gradient ranged from15°～45°on sunny slopes and semi-sunny slopes；the nest-sites have high-level concealment, the density of herbaceous is higher than5strains／m2；averagehigh of vegetation is higher than30cm; distance of nests to cliff upper is between2～5m; the distance towater resource is within100m; distance to settlements is more than1Km；distance to the prairie path is morethan0.5km while has no special requirements of species richness.The principal components analysis shows that there are three most important factors ofUpland Buzzard nest-site selection as follows, the covert factors (including nest-site area plantcharacteristics and topographic features), food factors and human interference factors. In themain compositions, Average high of vegetation, distance to water, distance to settlements andnest height have the relative coefficient absolute value.Through this research on nest-siteselection, we try to provide scientific basis for Upland Buzzard field protection, thus we cancarry out targeted protection of the breeding habitat for Upland Buzzard in Dalai Lake NaturalReserve, in order to improve the reproductive success rate and expand the population of UplandBuzzard, at the same time make a contribution to maintain the ecological balance in west bank ofDalai Lake.