Setting monitoring transect in the middle and shallow water area(altitude 156-172 m) in Three Gorges reservoir hydro-fluctuation belt to research the changing characteristics of the contents of N, P,K,pH and organic m...Setting monitoring transect in the middle and shallow water area(altitude 156-172 m) in Three Gorges reservoir hydro-fluctuation belt to research the changing characteristics of the contents of N, P,K,pH and organic matter of the soil which experienced the influence of fluctuation the first time. The results showed that by the influence of water level fluctuating,contents of soil N,P,K,pH and organic matter had reduced in different soil layers in hydro-fluctuation belt.The available N decreased by 41.53%-59.87%,available P decreased by 5.26%- 36.76%,available K decreased by 3.55%-45.56%, total N decreased by 9.52%-40.00%,total P had no change generally,total K had decreased a little, content of organic material decreased by 7.62%- 37.83%%,pH value turned to neutral,changed by 1.73%-9.58%.展开更多
By applying ARC/INFO (NT version) of the GIS software package , we extracted the existing geographicaldistribution ofHaloxylon dominated desertvegetationandproduced athematicmap ofgeographical distribution of theexist...By applying ARC/INFO (NT version) of the GIS software package , we extracted the existing geographicaldistribution ofHaloxylon dominated desertvegetationandproduced athematicmap ofgeographical distribution of theexisting Haloxylon dominated desert vegetation based on the newly published Vegetation Atlas of China;we defined the adaptiveparameter range ofgeographical and climate ofHaloxylon dominated desert vegetation to generate the potential geographical distribution map of Haloxylon dominated desert vegetation with thesupport of GREEN software. We then sliced and compared the existing and thepotential distribution maps. The results show that the potential geographical distribution areas of Haloxylon ammodendron and Haloxylon persicum dominated desert vegetation accord with the existing distribution areas in the administration division, and the topographic types in both the distribution areas are similar. However, the borders of different directions ofthe potential H. ammodendron dominated desert vegetation distribution has surpassed 0.4° to 5.9° of the existing borders. The borders of different directions of the potential H. persicum dominated desert vegetation has surpassed 0.9° to 3.3° of the existing borders. In China, the existing geographical distributionalarea ofH. ammodendron dominated desertvegetation accounts for 9.1% of the potential one in China and the proportion of the existing H. persicum dominated desert vegetation distribution area to the potential areais 34.1%. The result of comparison of the potential and the existing distribution areaof Haloxylon dominated desert vegetation can provide important scientific basisfor the recovery, reconstruction and introduction of Haloxylon dominated desertvegetation.展开更多
文摘Setting monitoring transect in the middle and shallow water area(altitude 156-172 m) in Three Gorges reservoir hydro-fluctuation belt to research the changing characteristics of the contents of N, P,K,pH and organic matter of the soil which experienced the influence of fluctuation the first time. The results showed that by the influence of water level fluctuating,contents of soil N,P,K,pH and organic matter had reduced in different soil layers in hydro-fluctuation belt.The available N decreased by 41.53%-59.87%,available P decreased by 5.26%- 36.76%,available K decreased by 3.55%-45.56%, total N decreased by 9.52%-40.00%,total P had no change generally,total K had decreased a little, content of organic material decreased by 7.62%- 37.83%%,pH value turned to neutral,changed by 1.73%-9.58%.
基金The study was supported by a project of Department of Wildlife Protection, State Forestry Administration (No.2002-1)and a project of national science fund (90211006)
文摘By applying ARC/INFO (NT version) of the GIS software package , we extracted the existing geographicaldistribution ofHaloxylon dominated desertvegetationandproduced athematicmap ofgeographical distribution of theexisting Haloxylon dominated desert vegetation based on the newly published Vegetation Atlas of China;we defined the adaptiveparameter range ofgeographical and climate ofHaloxylon dominated desert vegetation to generate the potential geographical distribution map of Haloxylon dominated desert vegetation with thesupport of GREEN software. We then sliced and compared the existing and thepotential distribution maps. The results show that the potential geographical distribution areas of Haloxylon ammodendron and Haloxylon persicum dominated desert vegetation accord with the existing distribution areas in the administration division, and the topographic types in both the distribution areas are similar. However, the borders of different directions ofthe potential H. ammodendron dominated desert vegetation distribution has surpassed 0.4° to 5.9° of the existing borders. The borders of different directions of the potential H. persicum dominated desert vegetation has surpassed 0.9° to 3.3° of the existing borders. In China, the existing geographical distributionalarea ofH. ammodendron dominated desertvegetation accounts for 9.1% of the potential one in China and the proportion of the existing H. persicum dominated desert vegetation distribution area to the potential areais 34.1%. The result of comparison of the potential and the existing distribution areaof Haloxylon dominated desert vegetation can provide important scientific basisfor the recovery, reconstruction and introduction of Haloxylon dominated desertvegetation.
