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    20 September 2009, Volume 7 Issue 3 Previous Issue    Next Issue
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    Bird Diversity in Nongjiang River Wetland Ecological Corridor and Its Surrounding in the Sanjiang Plain in Spring
    SHU Bao-Guang, LI Xiao-Min, JIANG Meng, WU Hai-Chao, YANG Yang
    2009, 7 (3):  191-196. 
    Abstract ( 2309 )   Save
    The middle of Nongjiang River is the ecological corridor connecting the two wetlands of Honghe National Nature Reserve and Sanjiang National Nature Reserve.The types and features of marsh wetlands in the corridor area are representative of the original landscapes of the Sanjiang Plian.By the field survey,the characteristic of bird diversity in Nongjiang River wetland ecological corridor and its surrounding was studied in the spring,2008.11 monitoring plots were chosen according to different bird habitats' types.68 species of spring birds,belonging to 14 families and 26 orders were recorded in the corridor.The results showed that the bird diversity was abundant in the corridor in spring and the index of Shannon-Winner was 1.466 9.Bird diversity index of the habitat of mire was the maximum(1.260 1),next was the habitat of water body(1.248 8),residential area(0.903 1),farmland(0.872 8),the habitat of forest was the minimum(0.871 6);the evenness index of water habitat(0.182 3)was the maxim um,next was then the farmland(0.164 6),forest(0.142 9)and mire(0.110 5),the index of residential area was the minimum(0).The area of mire and water body should be maintained to preserve the ecological function of Nongjiang River wetland corridor.
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    Breeding Habitat Suitability Evaluation of Red-crown Crane in Zhalong National Nature Reserve by the Method of Habitat Suitability Index
    WANG Zhi-Jiang, CHEN Zhi-Chao, HAO Cheng-Yuan
    2009, 7 (3):  197-201. 
    Abstract ( 2138 )   Save
    Red-crown crane(Grus japonensis) is a kind of rare water birds in the world.And the protection of the species has been attracting attentions worldwide.Due to habitat losses and deterioration,the species continued to decline in number.And we come to recognize that the habitats should be conserved to save the species.Zhalong National Nature Reserve(NNR) is a key-breeding place for the red-crown crane and other rare threatened and endangered water birds.In order to evaluate the breeding habitat quality,the method of habitat suitability index(HSI) was introduced in the study.As a method of habitat evaluation,HSI model has been widely used in the programming and evaluation of land management.In the paper,four major habitat factors for the red-crown crane were identified by field investigation,including disturbance,food,water regime and shelter in Zhanglong NNR.Although these four habitat variables have indirect relationship with vegetation types,disturbance degree,food richness,water depth and shelter condition can expressed by vegetation types in a way.And then 4 Aster images in 2003 were used to map the vegetation type in the study area with the Arcmap software,and then field investigations of vegetation type were conducted to verify and correct the interpreted vegetation map.Based on maps of detailed vegetation types in 2003,each habitat factor map was made from the vegetation maps by the tool of ArcGIS software.A HSI model was built reflecting habitat factors and human impacts based on GIS technology.In order to verify the built HSI1 and HSI model,After the collection of the data about the locations of each red-crown crane's nest recorded with the GPS in the same period(in 2003),the nests' locations were then changed into dot map(shape file).The dot map,called the input file,was overlaid by the HSI1 model map and HSI model map respectively to verify the accuracy of each model(including the built HSI1 and HSI model).The following conclusions were achieved that the acreage of suitable habitats for red-crown crane was 385 km2;the acreage of the less suitable habitats was 204 km2;and the acreage of unsuitable habitats was as high as 1 510 km2.The suitable habitats was distributed horizontally(or like a strip) in the study area and aggregated mainly in the core area of the reserve.The fragmentation of habitats was a very important one among all the factors related to the suitability of habitats,which play an important role on the red-crown crane's selection of habitats.The HSI model was proved right and effective in evaluating the habitat quality in the paper.
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    Landscape Pattern Change of Yancheng Coastal Wetland in Jiangsu
    DING Jing-Jing, WANG Lei, JI Yong-Hua, DING Yu-Hua, LI Rong-Jin
    2009, 7 (3):  202-207. 
    Abstract ( 2289 )   Save
    Three TM images obtained on 7 June 1992,26 May 2002 and 20 May 2006 respectively were interpreted as basic information sources.The landscape pattern change of Yancheng coastal wetland in recent 15 years was analyzed.In 1992,there was an area of 80 918 ha for natural wetlands,including bare beach covered 31 604 ha,taking up 28.32% of total area of coastal wetlands;22.65% Phragmites australis wetland,and 1.04% Imperata cylindrica wetland.As for artificial wetlands,the area of fish pools was 16 138 ha,which is 14.46% of total area of coastal wetlands;the farmland area was 10 293 ha;and the area of salt wetland was 3.82% of total area of coastal wetlands.In 2002,there was an area of 40 227 ha for natural wetlands,including Spartina wetland covered 13 989 ha,taking up 12.53% of total area of coastal wetlands;8.48% Suaeda salsa wetland and 0.92% Imperata cylindrica wetland.As for artificial wetlands,the area of fish pools was 48 264 ha,43.24% of total area of coastal wetlands;the farmland area was 18 540 ha;and the area of salt wetland was 4.11% of total area of coastal wetlands.In 2006,there was an area of 30 278 ha for natural wetland,including Phragmites australis wetland covered 9 217 ha,occupying 8.26% of total area of coastal wetlands;7.74% Spartina wetland and 0.77% Imperata cylindrica wetland.As for artificial wetlands,the area of fish pools was 53 717 ha,48.13% of total area of coastal wetlands;the farmland area was 23 041 ha;and 4.11% salt wetland.There was a significant drop on the area of natural wetland and a rapid rise on the area of artificial wetland from 1992 to 2006.The area of bare beach shrank mostly in the patches,decreasing 28 515 ha during 15 years.The areas of Phragmites australis wetland and Suaeda salsa wetland showed the same trend.The reclamation resulted in area of natural wetland decrease and area of artificial wetlands increase.About 37 579 ha fish-pool and 12 748 ha farmland had been reclaimed during 15 years.Wetland landscape change occurred in the transformation,from bare beach to fish-pool and Spartina wetland,from Phragmites australis wetland to fish-pool in the period of 1992-2002;and from Spartina wetland to fish-pool,from fish-pool to farmland,from Suaeda salsa wetland to Phragmites australis wetland in the period of 2002-2006.Wetland landscape change occurred in the following areas,Sheyang Estuary-Xinyang Port,Doulong Port-Chuandong Port and Chuanshui Port-Laoba Port from 1992 to 2006.In Sheyang Estuary-Xinyang Port,7 971.75 ha Phragmites australis wetland and Suaeda salsa wetland had been explored to fish-pools.In Doulong Port-Chuandong Port,12 687.93 ha bare beach to fish-pools,in Chuanshui Port-Laoba Port,5 400.18 ha Phragmites australis wetland to farmland.
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    Zinc and Copper Concentrations in Two Species of Intertidal Crabs from the Middle of the West Coast of Peninsular Malaysia
    Mohammad Mohd Ikram, Ahmad Ismail, Chee Kong Yap, Nor Azwady Abd Aziz
    2009, 7 (3):  218-229. 
    Abstract ( 1861 )   Save
    A study on Zn and Cu concentrations in 2 species of intertidal crabs,namely Uca annulipes and Dotilla myctiroides collected from the intertidal coastal area of Selangor(5 sites) and Negeri Sembilan(3 sites),west coast of Peninsular Malaysia,was carried out.The various localized sources of Zn and Cu discharges towards both the crab species were mentioned.A comparative study between the 2 crab species also revealed that the concentrations of Zn and Cu were significantly(P<0.05) higher in U.annulipes when compared to D.myctiroides.This difference was related to the organic matter percentage in the crabs' microhabitat sediments since metals can be associated with the organic matter of sediments in which they might ingest.Significantly(P<0.05) higher organic matter content was shown in U.annulipes sediments when compared to D.myctiroides sediments for all stations.The metal and size relationship in the crabs was also investigated.The relationships between Zn and Cu concentrations with body weight and carapace width of U.annulipes and D.myctiroides were significantly(P<0.01 and P<0.05) correlated although the pair wise was weak.
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    Preliminary Study on Cyanobacterial Bloom in Xiangxi Bay,Three Gorges Reservoir
    ZHANG Min, CA Qiang-Hua, WANG Lan, XU Yao-Yang, KONG Lian-Hui, TAN Lu
    2009, 7 (3):  230-236. 
    Abstract ( 2625 )   Save
    A large-area cyanobacterial bloom was observed for the first time in some bays of Three Gorges Reservoir(TGR) in June 2008,which indicated the deterioration of the aquatic ecosystem.Thick blooms covered most parts of Xiangxi Bay that is a classical bay of TGR on 20 June 2008.Fourteen sampling sites were monitored weekly from 6 June to 25 July 2008,to study the dynamics of the algal bloom in the bay.The whole process of this algal bloom and some influencing factors were analyzed in this paper.The results showed that the bloom broke out on about 9 June 2008;and reached the summit on 20 June and ended on 11 July,lasting for about a month.According to Carlson's Trophic State Index(TSI) criteria,Chl.a content is equal to 20 μg/L and TSI is 60 are the critical values of cyanobacterial predominance.In the present study,the intersection of Chl.a content is more than 20 μg/L and TSI is more than 60 were set as the threshold state of the cyanobacterial bloom.According to the criteria,the whole process of the bloom could be divided into 2 stages:9-25 June was the first stage and 3-11 July was the second stage.The zone of the algal bloom was mainly concentrated in the region about 20-30 km away from the river mouth,namely the middle-upper reaches of the bay.This indicated that suitable hydrodynamic conditions were necessary to the outbreak of the cyanobacterial bloom.Low phosphorus and high N/P were the main factors limiting the bloom.When phosphorus content decreased and N/P increased significantly,the growth of the cyanobacteria was suppressed.The results also preliminarily indicated that N/P within the range between 10:1 and 25:1 was more favorable to the growth of the cyanobacteria in this area.So,decreasing the input of the phosphorus is of great importance to prevent or control the algal blooms in Xiangxi Bay.
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