| During April to June in 2006, in the hilly area, south of Henan Province (Que Shan country), four Ardeidae birds′(Ardeola bacchus, Egretta garzetta, Bubulcs ibis and Nycticorax nycticorax) nidification habitat and nest～like structure were investigationIn allusion to the general characteristics of ardeidae birds nest,10 categories ecological factors,number of trees, tree high, tree diameter at breast height, crown high, crown radius, the number of shrubs, bushes cover, aspect, slope gradient,slope location,were select. First,to compared the difference of average about ecological factors which were selected by ardeidae birds. Used the same t～test method of two samples, to study the four ardeidae birds categories selective various to environmental factors, drew the following conclusions:1.In secondary forest, the tree height, tree crown high, crown radius, trees diameter at breast height and the slope location have strong effect for Ardeola bacchus, and have reached prominent levels (P <0.01), tend to choose a tall, larger crown tree,bulky trees and lower slope to inhabit; There is a weak selective of the number of trees and shrubs, shrub cover, aspect and slope. did not reach prominent levels (P> 0.05); In the artificial coniferous forest, the tree height, tree crown, tree diameter at breast height, the number of shrubs, bushes cover, aspect, slope gradient and slope location have strong effect for Ardeola bacchus, and have reached prominent levels (P <0.01), tend to choose tall and large trees, smaller shrubs, Sunny and lower slope as the Habitat;But there are not obvious selectivity to the number of tree crown radius, not reached prominent levels (P> 0.05)。2.In secondary forest, the tree height, the height of tree crown, crown radius, diameter and the slope location have strong effect for Egretta garzetta, when they nidificate,have reached mighty prominent levels (P <0.01), tend to choose tall,crown larger trees and on the lower slope .The number of trees, shrubs and the number of cover, slope and the slope, and other factors not obvious choice, did not reach prominent levels (P> 0.05);In artificial coniferous forest, the number, height, crown height and diameter of tree,shrub cover and the geographical factor (slope, slope gradient and slope position) strong effect for Egretta garzetta when they nidificate, have reached a very prominent Level (P <0.01), tend to choose a few of trees and a single tall tree, shrub cover better, eutropic, glacis and lower as the habitat.3.In secondary forest, the slope location have strong effect for Egretta garzetta, when they nidificate,to achieve a prominent level (P <0.01). All the of nidification habitat on the low sople. Others factors (the number of trees, tree height, tree crown, crown radius, diameter tree, shrub amount, shrub cover, aspect and the slope)is less to be selected;In artificial coniferous forest, the crown radius of this factor had no obvious selectivity, did not reach prominent levels (P> 0.05), and there is a little selective about aspect (0.01 0.05)。On the basis of to understand the selection of nidification habitat about four. A further research about nests in a spatial distribution of the Ardeidae birds′was study. the different kind of nest Ardeidae in the horizontal and vertical distribution was analysis,and contrast to tree canopy. To study the relative relations about nest in the canopy and the spatial distribution of, Ardeidae birds′. draw the following conclusions。1. In secondary forest,compare to coniferous forest,the Ardeola bacchus prefer to the higher tree. And generally its nest have a far tree distance between trunk from the nest than in the artificial coniferous forest;And, it is selective for branch of trees. In secondary forest,the nest all most on the four grade branches. But in the artificial coniferous forest,the nest all most in the two to three branches;In the natural secondary forest, Ardeola bacchus nests are mainly located in the Quercus variablis, compared to the tree canopy, in the horizontal direction,the nests are mainly located in the in the internal and central of tree canopy;In the vertical direction, their nests are mainly located in the upper part of the tree crown. In artificial coniferous forest, the main nesting of Pinus tabulae formis, the relative position are in middle the,horizontal direction, vertical relative position in the upper and middle part of the tree crown.2.In the natural secondary forest,The hight of Egretta garzettaˊ s nest between the 10 ~ 13 m, In artificial coniferous forest,it is 5 ~ 10 m. It is different,the nest on branches of the trees in the two forest communities. In secondary forests,it is five to eight branches. And in the artificial coniferous forest are mainly located in truck. In secondary forests, mainly nest are in the Quercus variablis, the specific location,most of them are in the middle,in the horizontal direction,and upper,on the vertical direction of tree canopy;In artificial coniferous forest, mainly in Pinus tabulae formis, he specific location,most of them are in the middle,in the horizontal direction,and upper or middle,on the vertical direction of tree canopy. 3.In the natural secondary forest, The hight of Bubulcs ibisˊ s nest between the 8 ~ 12 m,. the average distence from nest to tree trunk is 80 cm, that is three to seven branches;In artificial coniferous forest, its nest average high is 8 ~ 11 m mainly , most of the nests are close to the tree truck. In the natural secondary forest, the Bubulcs ibisˊ s nest have no obvious requirements fou trees spiece, In the horizontal direction,they nest in the tree canopy within, no one in the outside In a vertical direction,was mainly located in the upper crown, no one in the bottom of tree canopy In artificial coniferous forest, all the nests are built in Pinus tabulae formis, t In the horizontal direction,they nest in the tree canopy within,In a vertical direction,was mainly located in the upper crown.4. Most of the Nycticorax nycticoraxˊ s nest are in high and tall tree (9 ~ 11 m). The average height of nest is 8.7±1.1m, And the average distance is 0.5±0.5m from nest to the tree trunk. Most of the Nycticorax nycticoraxˊ s nest are buring in the Pinus tabulae formis, In the horizontal direction,they nest in the tree canopy within. In a vertical direction,was mainly located in the upper crown.
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