The nest-site selection of red-crowned crane in Zhalong nature reserve after burning and irrigating

After a big fire from August to October of 2001,50% of the core zone in Zhalong Nature Reserve was burned;In the early March of 2002,the reserve was burned again.From the middle of April 2002,300 000 000 m3 of water was continuously irrigated to wetland.To determine the impact on nest-site selection of Red-crowned crane by the burning and water flooding,a research on the nest-site positioning and selection of Red-crowned crane was conducted in Zhalong Nature Reserve by GPS and factor measurement.The results show that(1)the most important factors on Red-crowned crane nest-site selection are the taller(t=3.429 75) surplus reeds(t=29.320 15) and lakeside(t=4.205 08).(2)Vegetation type also is the important factor of the nest-site selection,the most preference cover type is reed-marsh(66.67%).(3)The distance to burned area(t=2.208 46) also restricts the nest-site selection of Red-crowned crane,but the Red-crowned cranes possibly build nests in burned area.(4)The water depth under the nest(t=2.310 98),the distance to human disturbance area(t=1.082 84),vegetation coverage (t=0.265 43)have close relation to nest-site selection of Red-crowned crane.