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the relative position and role of a certain species within
the community (Li et al , 2000) , which is an impor2
tant index for identifying the hazard grade of birds at
the airport . Importance values were calculated accord2
ing to IV = (comparative number + comparative time +
comparative dimension + comparative weight ) / 4 ,
where ; comparative number = ( number of individual
birds of a species/ the largest number of individual
birds of any species ) ×100 ; comparative time =
(number of investigations for a bird species/ total num2
ber of investigations ) ×100 ; comparative dimension
= (total number of sample strips which a bird was ob2
served on/ total number of sample strips ) ×100 ; com2
parative weight = (estimated weight of all birds of a
single species/ the largest weight of all birds of any
species ) ×100. The bird weight was estimated accord2
ing to Zhao ( 1995 , 2001) . The average weight of
male and female birds was the final bird weight ; IV ≥
25 was defined as the most important bird , 15 ≤IV <
25 as highly important birds , 5 ≤IV < 15 as less im2
portant birds , and IV < 5 as the least important birds
within the community.
2 　Results and analysis
211 　The composition of bird species in the com2
munity
In spring , a total of 59 species and 32 576 individ2
uals , belonging to 10 orders and 26 families were
recorded in the sampling area of the airport . Of these
species , 20 are residents , accounting for 3319 % of
species , 24 are summer migrants , accounting for
4017 %of species , five are winter migrants , accounting
for 815 %of species and 10 are visitors , accounting for
1619 % of species. The seasons , statistics , densities ,
importance values , distribution coefficients and proba2
bilities of interactive encounter are shown in Tab . 1.
The distribution coeffients across the habitats
(Tab. 1) , showed that in spring there were two widely
distributed species , Pica pica and Passer montanus ,
accounting for 314 % of the total number of species.
There were also 15 mid2distribution species , including
Falco tinnunculus and Perdix dauuricae , accounting
for 2514 % of species , and 42 narrow distribution
species , including Accipiter nisus and Falco amuren2
sis , accounting for 7112 % of species. Therefore , the
narrowly distributed birds are the main birds at the air2
port . The average density of birds in spring was 1616 /
ha . The highest density species are Corvus dauuricus ,
Corvus corone and Passer montanus with densities of
1113 , 1155 and 1128/ ha respectively. The overall
probability of interactive encounter was 01516 and the
highest probability of interactive encounter was 01217
for jackdaws.
212 　The identif ication of the hazard grade of
birds
According to Tab. 1 , 15 species , including Falco
tinnunculus and Perdix dauuricae , were classified as
the most important species , 12 are highly important
species , including Accipiter nisus and Falco amuren2
sis , 20 are less important , including Coturnix japonica
and Charadrius veredus and 12 are the least important
bird species , including Charadrius dubius and Apus a2
pus . According to the importance values combined with
the distribution , density , probability of interactive en2
counter , group behavior , whether they fly around the
2 期　　　　　　　　　　　　李　新等: 呼和浩特白塔機場春季鳥類的鳥擊危險等級評估(英文) 163
Tab. 1 　The composition and hazard grade of the avian community of Baita Airport in spring
Species Distribution Quantity
Number of
individuals
Density
Transect
Quantity
Number of
Habitats
Observed in
Importance
Values
Distribution
Coefficient
( %)
Probability
of Interactive
Encounter
11Accipiter nisus
333 P 1 1 010005 1 1 181659 5125 0100003
21 Falco tinnunculus
3333 R 12 12 010061 10 9 381446 48150 0100037
31 Falco amurensis
3333 S 3 2 010015 2 2 161359 10150 0100009
41 Falco subbuteo
3333 S 4 2 010020 2 1 181345 6150 0100012
51 Perdix dauuricae
3333 R 54 13 010276 8 6 411972 34100 0100165
61 Coturnix japonica
333 R 1 1 010005 1 1 81625 5125 0100003
71 Phasianus colchicus
3333 R 20 7 010102 7 6 1121412 32175 0100061
81Vanellus cinereus
3333 S 7 5 010036 3 3 291255 15175 0100021
91 Charadrius dubius
33 S 2 1 010010 1 1 41837 5125 0100006
101 Charadrius veredus
3333 P 18 1 010092 1 1 81659 5125 0100055
111 Tringa ochropus
3333 P 1 1 010005 1 1 81816 5125 0100003
121Actitis hypoleucos
　
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