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苏州太湖湖滨带芦苇湿地鸟类群落研究
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摘要
自2010年6月到2011年5月,对苏州太湖国家湿地公园及周边区域的湖滨带芦苇湿地,逐月进行了为期一年的鸟类调查,分析了湖滨带芦苇湿地鸟类群落结构的特征,对人工芦苇湿地和原生芦苇湿地鸟类群落进行了对比,探讨了冬季芦苇收割对鸟类群落的影响。主要研究结果如下:
     1、全年共记录到鸟类50种,隶属11目28科,雀形目鸟类有29种,数量上占绝对优势,占总数量的77.74%。留鸟和夏候鸟共33种,占总数量的66%。地理区系间差异不大,体现出南北过渡的特征。鸟类物种数和密度全年的变化趋势较为一致,最低值分别出现在1月和2月,之后开始种类和密度持续增长,5月种类达到全年最大30种,6月密度达到全年最大为14.74只/ha,至9月份为种类和密度的回落期,10、11、12月鸟种数和密度基本稳定。春季鸟类物种数、多样性、均匀度明显高于其他季节。
     2、人工、原生芦苇湿地分别记录到鸟类39种、36种,共有物种25种,相似性系数为0.625,属于中等相似。人工芦苇湿地雀形目鸟类相对较多,原生芦苇湿地非雀形目水鸟类相对较多。居留型上差异不大,都体现为留鸟>夏侯鸟>冬候鸟>旅鸟的特征。各月鸟类物种数比较发现,冬季和春季人工芦苇湿地>原生芦苇湿地;夏季和秋季原生芦苇湿地>人工芦苇湿地。各月鸟类密度对比发现,2月至5月人工芦苇湿地>原生芦苇湿地;6月至1月原生芦苇湿地>人工芦苇湿地。两种生境鸟类群落在秋季相似性系数最高为0.593,春季最低相似性系数为0.487。春夏季原生芦苇湿地多样性高,人工芦苇湿地在秋冬季多样性高。
     3、在时间尺度上将芦苇收割划分为收割前、收割当月、收割次月来研究收割对鸟类群影响的即时效应。结果显示,物种数在收割当月下降明显,有10种鸟类消失,而在收割次月比割前新增了6种鸟类。收割导致了鸟类密度的大量下降,收割当月和次月均超过50%。相似性系数显示:收割当月与收割次月最高为0.647、收割次月与收割前最低为0.423。多样性指数为收割次月>收割前>收割当月;均匀性指数为收割次月>收割当月>收割前。收割后的3月至7月为芦苇生长期,高度在生长后期(5月~7月)增长快速,密度在生长前期(3月~5月)增长快速;芦苇密度在6月后基本稳定,芦苇高度在7月还略有增长。人工芦苇湿地芦苇高度要大于原生芦苇湿地,但芦苇密度低,对两地生长期芦苇高度和密度进行t检验发现差异不显著(p>0.05),鸟类群落差异可能和其他因素关系更大。
     4、在空间尺度上,对收割前芦苇生境中鸟类的空间利用情况进行了调查。水平空间上,分为芦苇-陆地、苇丛内、芦苇-水域、苇荡明水面四种。鸟类种类在芦苇-水域、芦苇-陆地区域较多,分别占到总种数的60%和50%,苇丛内、芦苇-陆地区域鸟类的数量较多,分别占到总数量的44.30%和30.70%。垂直空间上,将芦苇植被分为上中下三层。鸟类种类在芦苇植被的下层最多占总种数的70%,数量在芦苇植被的下层和中层居多,分别占53.84%和34.75%。通过观察到的行为记录,发现和芦苇关系较为密切的鸟类有13种。当地芦苇整体收割的方式对鸟类密度、冬候鸟越冬、特化种觅食影响很大。基于对鸟类群落和种群的保护,芦苇收割可以采取适当保留水域和陆地边缘的芦苇带或仅收割芦苇植被中上层的方式。
During June.2010and May.2011,in the Suzhou taihu lake national wetland park and thelakeside reed wetland,we studied the avian community structures.The characteristics of aviancommunities were analyzed and communities characteristic were compared between artificialreed wetland and natural reed wetland. Moreover, the impact of avian communities brought bythe reed reap was analyzed too. The main results conveyed as follows:
     1. Fifty bird species were recorded during the investigation and belonged to11order28families while29Passeriformes species were counted and comprised77.74%of the overallspecies with dominant numbers. Of all the species Resident bird and summer visitor comprisedabout66%with33species. The dynamic law of the avian density and species remained stableduring the year, the density and species reached its bottoms in January and February, then bounceback, the avian species reached its peak30in May and the avian density reached its peak14.74/ha in June. When it came to September, the density and species began to decline. October,November and December the avian density and species remain stable. The avian species,diversity and evenness exhibit obvious abundance in spring compared with other seasonsespecially winter, which showed lowest abundance in avian community.
     2. There were39and36kinds of bird species in artificial reed wetland and natural reedwetland respectively, from which25species were recorded in both habitats. The similaritycoefficient was0.625showing medium spatial heterogeneity. Passeriformes were frequentlyobserved in artificial reed wetland but seldom observed in natural reed wetland. However, thenumber of winter visitors, summer visitors, residents and migrant birds were not changeddynamically during the year. Avian species that recorded in artificial reed wetland were moreabundant than that of natural reed wetland in spring and winter but the opposite satiation wasobserved in summer and autumn. Contrast bird density of each month, from February to May, theartificial reed wetland>native reed wetland; from June to January native reed wetland in>artificial reed wetland. The two different reed habitats both had highest similarity coefficient of0.593in autumn and reached lowest similarity coefficient0.487in spring. The biodiversity ofnatural reed wetland was abundant in spring and summer, while the biodiversity of artificial reedwetland was abundant in autumn and winter.
     3. Investigation results were compared under three different temporal patterns, the monthbefore reed cutting, the reed cutting month, and the month after, in order to find the influence ofavian community due to reed cutting. This comparison revealed that ten avian speciesdisappeared in the cutting month but six more avian species were observed the month after.Passeriformes species were more sensitive towards reed cutting which rapidly decreased theavian community by50%. The highest similarity coefficient of the reed cutting month and afterwas0.647while the lowest similarity coefficient turned out to be0.423. The dynamic law of diversity index: the month after cutting>the month before> the cutting month, as well asevenness index: the month after cutting> the cutting month> the month before. After the cutting,new reeds began to grow in March. Reed height of rapid growth in May-July, the density of rapidgrowth in the March-May; reed density remained stable in June, reed height in July, continues togrow. The height of reed, artificial reed wetland greater than the native reed wetland, but reeddensity is low. T test found no significant difference (p>0.05).
     4. Spatial scales of avian community were different. Horizontal scale was divided into fourtypes: reed to land area, reed-inside area, reed to water area, water inside reed area. Avian specieswere distributed mostly in reed to water area and reed to land area which counted for60%and50%respectively. The avian numbers were mainly counted in reed-inside area and reed to landarea which counted for44.30%and30.70%. In vertical scale dimension reed vegetation weredivided into top, middle and bottom layer. The avian species in bottom layer comprised most ofthe vertical scale which counted as70%. The avian numbers were identified mainly in the middleand bottom layer of reed vegetation which counted for53.84%and34.75%respectively.According to the avian behavior recorded, we found that13avian species were closely relatedwith the reed vegetation. The reed cutting events in local area had brought a huge impact on theavian community, especially affected the avian density, winter visitor overwintering, and theforaging of specialized species. Based on the avian conservation principle, we recommended thatreed cutting action should adopted the methods conveyed as follows: proper retention of thewater area and reed area near waterside or just reap the top and middle layer of the reedvegetation.
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