| 基于卫星遥感的潮滩植被、高程、潮沟空间关系探讨-以崇明东滩为例 |
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| 引用本文： | 郑宗生,周云轩,田波,丁献文.基于卫星遥感的潮滩植被、高程、潮沟空间关系探讨-以崇明东滩为例[J].海洋学报(英文版),2016,35(4):26-34. |
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| 作者姓名： | 郑宗生 周云轩 田波 丁献文 |
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| 作者单位： | 华东师范大学河口海岸学国家重点实验室, 上海 200062;上海海洋大学国际海洋研究中心, 上海 201306,华东师范大学河口海岸学国家重点实验室, 上海 200062,华东师范大学河口海岸学国家重点实验室, 上海 200062,上海海洋大学国际海洋研究中心, 上海 201306 |
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| 基金项目： | Program Strategic Scientific Alliances between China and the Netherlands under contract No.2008DFB90240; Open Research Fund Program for State Key Laboratory of Estuarine and Coastal Research under contract No.SKLEC201207; Open Research Fund Program for Shandong Province Key Laboratory of Marine Ecology Environment and Disaster Prevention under contract No.2012011. |
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| 摘 要： | The analysis of vegetation-environment relationships has always been a study hotspot in ecology. A number of biotic, hydrologic and edaphic factors have great influence on the distribution of macrophytes within salt marsh.Since the exotic species Spartina alterniflora(S. alterniflora) was introduced in 1995, a rapid expansion has occurred at Chongming Dongtan Nature Reserve(CDNR) in the Changjiang(Yangtze) River Estuary, China.Several important vegetation-environment factors including soil elevation, tidal channels density(TCD),vegetation classification and fractional vegetation cover(FVC) were extracted by remote sensing method combined with field measurement. To ignore the details in interaction between biological and physical process,the relationship between them was discussed at a large scale of the whole saltmarsh. The results showed that Scirpus mariqueter(S. mariqueter) can endure the greatest elevation variance with 0.33 m throughout the marsh in CDNR. But it is dominant in the area less than 2.5 m with the occurrence frequency reaching 98%. S. alterniflora has usually been found on the most elevated soils higher than 3.5 m but has a narrow spatial distribution. The rapid decrease of S. mariqueter can be explained by stronger competitive capacity of S. alterniflora on the high tidal flat. FVC increases with elevation which shows significant correlation with elevation(r=0.30, p0.001). But the frequency distribution of FVC indicates that vegetation is not well developed on both elevated banks near tidal channels from the whole scale mainly due to tidal channel lateral swing and human activities. The significant negative correlation(r=–0.20, p0.001) was found between FVC and TCD, which shows vegetation is restricted to grow in higher TCD area corresponding to lower elevation mainly occupied by S. mariqueter communities. The maximum occurrence frequency of this species reaches to 97% at the salt marsh with TCD more than 8 m/m2.
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| 关 键 词： | 遥感 植被分布 地理分布 盐沼 环境因子 |
| 收稿时间： | 2014/10/9 0:00:00 |
| 修稿时间： | 1/8/2015 12:00:00 AM |
The spatial relationship between salt marsh vegetation patterns, soil elevation and tidal channels using remote sensing at Chongming Dongtan Nature Reserve, China |
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| ZHENG Zongsheng,ZHOU Yunxuan,TIAN Bo and DING Xianwen.The spatial relationship between salt marsh vegetation patterns, soil elevation and tidal channels using remote sensing at Chongming Dongtan Nature Reserve, China[J].Acta Oceanologica Sinica,2016,35(4):26-34. |
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| Authors: | ZHENG Zongsheng ZHOU Yunxuan TIAN Bo and DING Xianwen |
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| Institution: | 1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;International Center for Marine Studies, Shanghai Ocean University, Shanghai 201306, China2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China3.International Center for Marine Studies, Shanghai Ocean University, Shanghai 201306, China |
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| Abstract: | The analysis of vegetation-environment relationships has always been a study hotspot in ecology. A number of biotic, hydrologic and edaphic factors have great influence on the distribution of macrophytes within salt marsh. Since the exotic species Spartina alterniflora(S. alterniflora) was introduced in 1995, a rapid expansion has occurred at Chongming Dongtan Nature Reserve(CDNR) in the Changjiang(Yangtze) River Estuary, China. Several important vegetation-environment factors including soil elevation, tidal channels density(TCD), vegetation classification and fractional vegetation cover(FVC) were extracted by remote sensing method combined with field measurement. To ignore the details in interaction between biological and physical process, the relationship between them was discussed at a large scale of the whole saltmarsh. The results showed that Scirpus mariqueter(S. mariqueter) can endure the greatest elevation variance with 0.33 m throughout the marsh in CDNR. But it is dominant in the area less than 2.5 m with the occurrence frequency reaching 98%. S. alterniflora has usually been found on the most elevated soils higher than 3.5 m but has a narrow spatial distribution. The rapid decrease of S. mariqueter can be explained by stronger competitive capacity of S. alterniflora on the high tidal flat. FVC increases with elevation which shows significant correlation with elevation(r=0.30, p<0.001). But the frequency distribution of FVC indicates that vegetation is not well developed on both elevated banks near tidal channels from the whole scale mainly due to tidal channel lateral swing and human activities. The significant negative correlation(r=-0.20, p<0.001) was found between FVC and TCD, which shows vegetation is restricted to grow in higher TCD area corresponding to lower elevation mainly occupied by S. mariqueter communities. The maximum occurrence frequency of this species reaches to 97% at the salt marsh with TCD more than 8 m/m2. |
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| Keywords: | remote sensing vegetation patterns Chongming Dongtan Nature Reserve salt marshes environmental factors |
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