In the coastal zone of Yellow River Delta, artificial dams,which were built as a protection against the sea, have important influence on the natural vegetation landscape and the gradient changes of soil properties. In this paper,we aim to research the influence of artificial dams on ecological characteristics of the study area with the support of remote sensing and GIS technology. First, we designed the field investigation program, then extracted coastline and artificial dams from remote sensing images, and finally researched changes of vegetation communities with distance from coastline, the influence of artificial dams on soil environment and the gradient patterns of soil properties under dam disturbance by statistical analysis and gradient analysis. We found that: (i) dam disturbance affected natural vegetation cover and accelerated the forward succession of natural vegetation communities in the coastal zone of Yellow River Delta; (ii) In the area with dams, the trends of the total nitrogen, available phosphorus and total salt in the distance gradient from the coastline were more influenced by dam disturbance. The dams built in different regions and at different times have different influences on soil properties; And (iii) total nitrogen was a linear increasing, but available phosphorus and total salt all showed a linear decrease. The change rates of these three factors in the north were higher than those in the south. After the dam built, the longer the time,the slower the trends of the gradient of this three factors. And the rates of change were lower with the growth over time. About 25 years after the dam built, the change rate was 0.003, and the trend of total nitrogen was almost stable. The results further explained the reasons of natural vegetation landscape heterogeneity on the distance gradient from the coastline. It also has some instructive significance for the restoration and protection of wetland landscape under the context of the development of Yellow River Delta.
FU Xin, LIU Gaohuan, HUANG Chong, LIU Qingsheng
. Analysis of Ecological Characteristics of Coastal Zone in Yellow River Delta under Dam Disturbance[J]. Journal of Geo-information Science, 2011
, 13(6)
: 797
-803
.
DOI: 10.3724/SP.J.1047.2011.00797
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