利用遥感技术分析沧州市1990、2000、2010和2019年等4个年份中在5月和10月的坑塘水水面面积，通过典型坑塘定位监测、区域调查取样结合ArcGIS软件分析坑塘水水质周年的变化与空间分布特征，综合坑塘水水量水质时空变化特征和主要作物需水特征评估典型年份研究区坑塘水的灌溉保障能力。研究结果表明：沧州市坑塘水体的空间分布呈东多西少的格局，坑塘水体的含盐量亦呈现东高西低的趋势。从时间分布来看，近30年来坑塘蓄水量总体呈增长趋势。通过影响因素分析，明确降水与蒸发是影响研究区坑塘水体增长的主要驱动因子，距离渤海的远近与地形地势是影响坑塘水含盐量分布格局的主要因素。沧州市坑塘多年平均蓄水量达到6.02亿m3，典型年份沧州市坑塘水分别能保障6 807 km2的冬小麦拔节期灌溉与7 104 km2的冬灌面积。坑塘水作为农业灌溉水源对于缓解河北低平原区水资源短缺意义重大。

Hebei low plain (HLP) is one of the most important grain production bases in China.But,it is facing a shortage of freshwater resources problem from a long time.Ponds are important facilities for regulating and storing rainwater and flood resources in HLP area,and the utilization of pond water has attracted increasingly attention.With the continuous development in remote sensing technology,it is frequently applied to extract and analyse the water bodies such as ponds and wetlands,and it is main research means to study the temporal and spatial changes of pond water.However,there are few comprehensive studies on the quantity and quality of pond water at present.For HLP,the utilization value of unconventional pond water remains to be further studied. Cangzhou was taleen as a typical area of HLP.The quantity of the pond water in May and October of 1990,2000,2010,and 2019 in Cangzhou city were analyzed by the remote sensing technology,and the pond water was extracted using the MNDWI (modified normalized difference water index) method.Based on location monitoring of typical pond and regional sampling,the temporal and spatial variation characteristics of water quality of the ponds in Cangzhou were analyzed by ArcGIS software,the IDW（inverse distance weighted）was used to interpolate the salt content of pond water in the study area.The irrigation guarantee capacity of the pond water in the typical year was evaluated according to the variation characteristics of pond water quantity and quality and the irrigation water requirement characteristics of the main crop in the study area. Most of the water bodies in the ponds were distributed in the eastern region near the Bohai Sea and the northwest near Baiyangdian.The spatial distribution trend of pond water was more in the east and less in the west.From 1990 to 2019,the storage capacity of the pond water in the study area showed a growing trend,which was consistent with the changing trend of the local precipitation，but opposite to the changing trend of water surface evaporation.The salt mass concentration in pond water in eastern Cangzhou was more than 5 g/L,which was not suitable for agricultural irrigation.In the west and south of Cangzhou,the water quality (mass concentration) of ponds was less than 5 g/L,which could be used for agricultural irrigation.In the typical year of 2019,the amount of pond water that can be used for irrigation at the jointing stage and pre-winter of winter wheat was about 511 million m3 and about 533 million m3,respectively.It could guarantee an irrigation area with 6 807 km2 at the winter wheat jointing stage and 7 104 km2 pre-winter,respectively. The spatial distribution of pond water bodies in Cangzhou was roughly in the pattern of more in the east and less in the west.Meanwhile,the salt content of the pond water in the eastern region of the study area was higher than that in the western region.The distance from the Bohai Sea and topography were the main factors affecting the spatial distribution pattern of water quantity and quality of ponds in the study area.In recent 30 years,the water quantity of ponds has generally been increasing.Precipitation and evaporation were the major driving factors affecting the change of pond water quantity in the study area.The average annual water storage of ponds in Cangzhou city has reached 602 million m3.As an agricultural irrigation water source,pond water is of great significance to alleviate the water shortage in HLP area.