The shrinking and drying up of wetlands in arid and semiarid areas of China have been widely observed in the recent years,but there has been no consensus on whether the aggravation is caused by human activities or by ...The shrinking and drying up of wetlands in arid and semiarid areas of China have been widely observed in the recent years,but there has been no consensus on whether the aggravation is caused by human activities or by global climate warming.For a better understanding of the cause,this study investigates the dynamic changes of Baiyangdian Lake wetland over the last 40 years.It is shown that since the 1980s,Baiyangdian Lake has suffered from an insufficient water input and shrunk considerably.By using SPSS11.0,this study undertakes a detailed analysis on the significance of the effects of the possible driving factors for the degradation.It is identified that the North China Plain has been warming up significantly in recent years,which causes a significant reduction in the precipitation and inflow to the lake.Although human disturbances such as the irrigation and storage of water in reservoirs do not play a decisive role,they accelerate the degradation and their effects should be minimized.展开更多
明确水鸟生境分布和变化,对于维持湿地水鸟物种多样性,改善生态环境质量具有重要意义。白洋淀丰富多样的生境条件为水鸟觅食栖息提供了良好条件。2017年以来,白洋淀生态补水工作取得显著成效,水质由劣V类提升到全面Ⅲ类,水位稳定保持在...明确水鸟生境分布和变化,对于维持湿地水鸟物种多样性,改善生态环境质量具有重要意义。白洋淀丰富多样的生境条件为水鸟觅食栖息提供了良好条件。2017年以来,白洋淀生态补水工作取得显著成效,水质由劣V类提升到全面Ⅲ类,水位稳定保持在7 m左右,淀区面积由171 km 2恢复至275 km 2左右,水域面积不断扩大,水鸟多样性和数量持续增加。但白洋淀地形复杂,生境影响因素众多,不同补水条件下水鸟生境的空间异质性特征还缺乏定量研究。结合遥感和地理信息系统技术,建立生境适宜性指数(HSI)评价模型,量化分析了不同补水条件下白洋淀4—8月鹭类生境的时空变化。结果表明:白洋淀水位和鹭类适宜生境面积密切相关。4月份,鹭类中、高适宜生境面积随水位呈单峰型变化,在水位为7.21 m时达到最大,约为79.76 km 2;5—8月份,鹭类中、高适宜生境面积随水位降低而增大,当水位低于6.33 m时随水位降低而逐渐减少。补水入淀位置是影响鹭类适宜生境时空格局的主要原因。单一入淀口补水,如由小白河、白沟引河分别补水,对淀区北部烧车淀生境适宜性改善效果显著,由府河补水对西部藻苲淀生境适宜性提升明显;4月初水位越低则4—5月份中高适宜生境面积越大。多个入淀口补水,由瀑河、府河和白沟引河相机补水,对整个淀区生境适宜性的改善效果最为显著;4月初高水位比低水位更利于4—8月鹭类栖息。研究成果对于白洋淀夏候鸟种群监测和保护具有一定科学意义。展开更多
基金Under the auspices of the National Natural Science Foundation of China (No. 30570303)
文摘The shrinking and drying up of wetlands in arid and semiarid areas of China have been widely observed in the recent years,but there has been no consensus on whether the aggravation is caused by human activities or by global climate warming.For a better understanding of the cause,this study investigates the dynamic changes of Baiyangdian Lake wetland over the last 40 years.It is shown that since the 1980s,Baiyangdian Lake has suffered from an insufficient water input and shrunk considerably.By using SPSS11.0,this study undertakes a detailed analysis on the significance of the effects of the possible driving factors for the degradation.It is identified that the North China Plain has been warming up significantly in recent years,which causes a significant reduction in the precipitation and inflow to the lake.Although human disturbances such as the irrigation and storage of water in reservoirs do not play a decisive role,they accelerate the degradation and their effects should be minimized.
文摘明确水鸟生境分布和变化,对于维持湿地水鸟物种多样性,改善生态环境质量具有重要意义。白洋淀丰富多样的生境条件为水鸟觅食栖息提供了良好条件。2017年以来,白洋淀生态补水工作取得显著成效,水质由劣V类提升到全面Ⅲ类,水位稳定保持在7 m左右,淀区面积由171 km 2恢复至275 km 2左右,水域面积不断扩大,水鸟多样性和数量持续增加。但白洋淀地形复杂,生境影响因素众多,不同补水条件下水鸟生境的空间异质性特征还缺乏定量研究。结合遥感和地理信息系统技术,建立生境适宜性指数(HSI)评价模型,量化分析了不同补水条件下白洋淀4—8月鹭类生境的时空变化。结果表明:白洋淀水位和鹭类适宜生境面积密切相关。4月份,鹭类中、高适宜生境面积随水位呈单峰型变化,在水位为7.21 m时达到最大,约为79.76 km 2;5—8月份,鹭类中、高适宜生境面积随水位降低而增大,当水位低于6.33 m时随水位降低而逐渐减少。补水入淀位置是影响鹭类适宜生境时空格局的主要原因。单一入淀口补水,如由小白河、白沟引河分别补水,对淀区北部烧车淀生境适宜性改善效果显著,由府河补水对西部藻苲淀生境适宜性提升明显;4月初水位越低则4—5月份中高适宜生境面积越大。多个入淀口补水,由瀑河、府河和白沟引河相机补水,对整个淀区生境适宜性的改善效果最为显著;4月初高水位比低水位更利于4—8月鹭类栖息。研究成果对于白洋淀夏候鸟种群监测和保护具有一定科学意义。
