Due to the regulation of the river Volga flow, expanding of the territories intended for construction and development of agriculture wetlands Volga-Akhtuba floodplain are being significantly transformed and are losing...Due to the regulation of the river Volga flow, expanding of the territories intended for construction and development of agriculture wetlands Volga-Akhtuba floodplain are being significantly transformed and are losing many of their qualities. Non-regulated loads lead to the break of natural physical and chemical characteristics of water bodies, loss of biodiversity, degradation of structure and functions of biological communities and, as a result, to decreasing of potential ecosystem services. Restoration of the lost qualities of water ecosystems is a key factor in increasing sustainability of reclaimed landscapes and creating comfortable conditions for living of locals and their economic activity. On the territory of the biosphere reserve “Nature park” “Volga-Akhtuba floodplain” a number of model sites were defined in order for research projects and practical work on restoration of degraded landscapes to be executed. The widest range of the lost ecosystem qualities is being restored during work on Lake Zapornoye. Restoration of ecosystem functions is being implemented according to the main economic activities carried out in this area. Ecosystem services of the area are specified in accordance with its functional purpose. The existing landscape and ecology conditions have been studied and estimated to see if the planned ecosystem services can be provided. The project suggests the following activities: restoration of hydro-morphological characteristics, reconstruction of habitats for biodiversity and their ecosystem services, improvement to restore and preserve recreational qualities of landscape. The project includes the monitoring the effectiveness of restoration. Monitoring program is based on indices of environmental assessment.展开更多
Soil sediment samples of 10 layers with a spacing of 10 cm each were collected in different floodplain zones adjacent to Huolin River in the Xianghai Nature Reserve, and contents of total N, total P and organic matter...Soil sediment samples of 10 layers with a spacing of 10 cm each were collected in different floodplain zones adjacent to Huolin River in the Xianghai Nature Reserve, and contents of total N, total P and organic matters were analyzed. The results showed that contents of total N, total P and organic matters were generally decreasing with the increase of distance from sample locations to the river channel, and contents of the three items were generally higher in the upper soil layer than that in the lower soil layer. The content variations displayed how flooding functions influenced nutrient matter content variations in floodplain soils since the flood inundation frequencies of the sample locations varied. The correlation analysis displayed that there were remarkable relativities between total N, total P and organic matters within definite spatial distance from the Huolin River channel.展开更多
Allochthonous organic matter plays an important role in nutrient cycling and energy mobilization in freshwater ecosystems.However,the subsidies of this carbon source in floodplain ecosystems have not yet well understo...Allochthonous organic matter plays an important role in nutrient cycling and energy mobilization in freshwater ecosystems.However,the subsidies of this carbon source in floodplain ecosystems have not yet well understood.We used a Bayesian mixing model and stable isotopes(δ^(13)C and δ^(15)N) of primary food resources and dominant molluscs species,to estimate the relative importance of allochthonous carbon sources for consumers in a representative sub-lake of Poyang Lake during a prolonged dry season.Our study inferred that terrestrial-derived carbon from Carex spp.could be the primary contributor to snails and mussels in Dahuchi Lake.The mean percentage of allochthonous food resources accounted for 35%-50% of the C incorporated by these consumers.Seston was another important energy sources for benthic consumers.However,during the winter and low water-level period,benthic algae and submerged vegetation contributed less carbon to benthic consumers.Our data highlighted the importance of terrestrial organic carbon to benthic consumers in the wetlands of Poyang Lake during the prolonged dry period.Further,our results provided a perspective that linkages between terrestrial and aquatic ecosystems might be facilitated by wintering geese via their droppings.展开更多
笔者从黄河源区河漫滩湿地地理地形指标和土壤指标出发,分析和研究黄河源区河漫滩湿地退化过程中土壤变化特征。结果表明:黄河源区河漫滩湿地不同退化阶段土壤的酸碱值大于p H 7时,p H随退化程度加剧有明显减少;随着退化梯度的加剧,土...笔者从黄河源区河漫滩湿地地理地形指标和土壤指标出发,分析和研究黄河源区河漫滩湿地退化过程中土壤变化特征。结果表明:黄河源区河漫滩湿地不同退化阶段土壤的酸碱值大于p H 7时,p H随退化程度加剧有明显减少;随着退化梯度的加剧,土壤含水量减少,草土比也逐渐减小;黄河源区河漫滩湿地退化土壤为松砂土,黄河源区河漫滩湿地随着退化程度的加剧小于0.01 mm物理黏粒含量基本上呈现减少的趋势;黄河源区河漫滩湿地主要养分在垂直方向上都表现出上层高于下层的规律,土壤有机质和全氮随着湿地退化都呈现了逐渐减少的规律。多重比较的结果,全N、全K和有机质,在退化阶段5与阶段1、阶段2、阶段3和阶段4之间差异显著(P<0.05),阶段1、阶段2、阶段3和阶段4之间差异不显著;碱解N在退化阶段2与阶段5之间差异显著(P<0.05),阶段1、阶段3和阶段4之间差异不显著;全P、速效P和速效K在河漫滩湿地退化过程中差异虽未达到显著水平,但随着退化进展,速效P是呈现出减少趋势,全P和速效K呈现出增加趋势。展开更多
文摘Due to the regulation of the river Volga flow, expanding of the territories intended for construction and development of agriculture wetlands Volga-Akhtuba floodplain are being significantly transformed and are losing many of their qualities. Non-regulated loads lead to the break of natural physical and chemical characteristics of water bodies, loss of biodiversity, degradation of structure and functions of biological communities and, as a result, to decreasing of potential ecosystem services. Restoration of the lost qualities of water ecosystems is a key factor in increasing sustainability of reclaimed landscapes and creating comfortable conditions for living of locals and their economic activity. On the territory of the biosphere reserve “Nature park” “Volga-Akhtuba floodplain” a number of model sites were defined in order for research projects and practical work on restoration of degraded landscapes to be executed. The widest range of the lost ecosystem qualities is being restored during work on Lake Zapornoye. Restoration of ecosystem functions is being implemented according to the main economic activities carried out in this area. Ecosystem services of the area are specified in accordance with its functional purpose. The existing landscape and ecology conditions have been studied and estimated to see if the planned ecosystem services can be provided. The project suggests the following activities: restoration of hydro-morphological characteristics, reconstruction of habitats for biodiversity and their ecosystem services, improvement to restore and preserve recreational qualities of landscape. The project includes the monitoring the effectiveness of restoration. Monitoring program is based on indices of environmental assessment.
基金Key Project of Chinese Academy of Sciences, No.ZKHZ-3-06
文摘Soil sediment samples of 10 layers with a spacing of 10 cm each were collected in different floodplain zones adjacent to Huolin River in the Xianghai Nature Reserve, and contents of total N, total P and organic matters were analyzed. The results showed that contents of total N, total P and organic matters were generally decreasing with the increase of distance from sample locations to the river channel, and contents of the three items were generally higher in the upper soil layer than that in the lower soil layer. The content variations displayed how flooding functions influenced nutrient matter content variations in floodplain soils since the flood inundation frequencies of the sample locations varied. The correlation analysis displayed that there were remarkable relativities between total N, total P and organic matters within definite spatial distance from the Huolin River channel.
基金Supported by the National Natural Science Foundation of China(Nos.41471088,41301077)
文摘Allochthonous organic matter plays an important role in nutrient cycling and energy mobilization in freshwater ecosystems.However,the subsidies of this carbon source in floodplain ecosystems have not yet well understood.We used a Bayesian mixing model and stable isotopes(δ^(13)C and δ^(15)N) of primary food resources and dominant molluscs species,to estimate the relative importance of allochthonous carbon sources for consumers in a representative sub-lake of Poyang Lake during a prolonged dry season.Our study inferred that terrestrial-derived carbon from Carex spp.could be the primary contributor to snails and mussels in Dahuchi Lake.The mean percentage of allochthonous food resources accounted for 35%-50% of the C incorporated by these consumers.Seston was another important energy sources for benthic consumers.However,during the winter and low water-level period,benthic algae and submerged vegetation contributed less carbon to benthic consumers.Our data highlighted the importance of terrestrial organic carbon to benthic consumers in the wetlands of Poyang Lake during the prolonged dry period.Further,our results provided a perspective that linkages between terrestrial and aquatic ecosystems might be facilitated by wintering geese via their droppings.
文摘笔者从黄河源区河漫滩湿地地理地形指标和土壤指标出发,分析和研究黄河源区河漫滩湿地退化过程中土壤变化特征。结果表明:黄河源区河漫滩湿地不同退化阶段土壤的酸碱值大于p H 7时,p H随退化程度加剧有明显减少;随着退化梯度的加剧,土壤含水量减少,草土比也逐渐减小;黄河源区河漫滩湿地退化土壤为松砂土,黄河源区河漫滩湿地随着退化程度的加剧小于0.01 mm物理黏粒含量基本上呈现减少的趋势;黄河源区河漫滩湿地主要养分在垂直方向上都表现出上层高于下层的规律,土壤有机质和全氮随着湿地退化都呈现了逐渐减少的规律。多重比较的结果,全N、全K和有机质,在退化阶段5与阶段1、阶段2、阶段3和阶段4之间差异显著(P<0.05),阶段1、阶段2、阶段3和阶段4之间差异不显著;碱解N在退化阶段2与阶段5之间差异显著(P<0.05),阶段1、阶段3和阶段4之间差异不显著;全P、速效P和速效K在河漫滩湿地退化过程中差异虽未达到显著水平,但随着退化进展,速效P是呈现出减少趋势,全P和速效K呈现出增加趋势。
