The Beijing Yeyahu Wetlands Autumn And Winter Bird Diversity Surveys And Habitat Selection Study

According to the investigation from October 2007 to March 2008,69 species of birds, belonging to 13 families,24 orders,45 genera,were recorded in Yeyahu Wetland of Beijing.Passing birds took up the most quantity,with 50 species around 72.5%;next is the resident birds with 14 species,winter birds with 12 species,and summer birds with 10 species.Among all of the recorded birds,1 species was of the first class of the national protected birds,9 species were of the second class of the national protected birds,4 species were of the first class of Beijing municipal protected birds,24 species were of the second class of Beijing municipal protected birds.9 species were the predominant species,8 the common species,and 52 the rare species.Swimming bird and wading bird which had close relationship with the wetland took the dominant position.Two habitat styles,Water area and wood land,possessed the highest G index and F index separately.As much as space distributing was concerned,close water area and Kangxi Grassland were detected to be the key regions.Based on the multi-satellite remote sensing image,square gridding lines at the interval of 100 meters were drawn within the area of bird investigation.Then,regarded all the intersections made by square gridding lines as the simulant samples equally existing on the area of bird investigation.Pointing out the real samples on the multi-satellite remote sensing image,if one real sample superposed one simulant sample endow this simulant sample with the quantity of birds number in that real sample;if one real sample failed to superpose one simulant sample eliminate the real sample as an ineffective sample;endowed with 0 of those simulant samples which never had endowed with quantity.Thereby,all simulant samples had endowed with quantity. Defined that simulant samples with the quantity≥15 were important samples and simulant samples with the quantity =0 were control samples,those with the quantity between 0 and 15 were eliminated.In this way there saved 118 important samples and 228 control samples.Through the support of 3S technology,16 factors were established firstly which were considered to be the factors of the habitat choice of winter birds in Yeyahu Wetland Nature Reserve.And then,through the method of Independent-Sample T Test and Pearson Chi-Square Test,10 factors of the 16 were proved to be the key variables.Lastly,through the method of Principal Component Analysis,5 components were confirmed to be the key components of the habitats selection of winter birds.Water and the adjacent environment,jamming,and systemic equilibrium should be emphasized.Finally,the author put forward proposals in the aspects of protecting water environment,eliminating jamming and raising the efficiency of management of the nature reserve.