Rapid urbanization is a global phenomenon that has altered many ecosystems and created ecological risks. Landscape risk (LER) reflects the extent to which are threatened by human activities environmental change. LER can be also employed effectively monitor assess quality. A large number of studies have been conducted explore in basin from perspective Land Use Cover (LUCC). Ecological issues such as land degradation seriously hindered sustainable development Yellow River Basin (YRB). Based on...

Hydrologic condition is a major driving force for wetland ecosystems. The influence of water regimes on vegetation distribution growing interest as wetlands are increasingly disturbed by climate change and intensive human activities. However, at large spatial scales, the linkage between remains poorly understood. In this study, communities in Poyang Lake were classified from remote sensing imagery. Water characterized inundation duration (IDU), depth (IDE), frequency simulated using...

Seasonal variations in local catchments and connected rivers lead to complex hydrological behaviours river-lake systems. Poyang Lake is a seasonally dynamic lake with frequent low levels spring autumn, which may be triggered by the catchment Yangtze River. Based on two typical years, hydrodynamic model combined long term observations was applied quantify spatiotemporal impacts of River autumn water Lake. As first attempt, this study explored spatial differences influences. Simulation results...

Arid zone lakes function as indicators of watershed ecology and environment, significantly influencing regional social development. In Ebinur Lake, a fuzzy water–land boundary hinders lake area extraction using remote sensing. Furthermore, unquantifiable anthropogenic–natural factors make it difficult to explore the drivers change. Utilizing Google Earth Engine (GEE), this study employs Landsat series, Sentinel 2, MOD09GA/MYD09GA data extract water Lake by applying indices such NDWI, MNDWI,...

Objective: Many maternal factors during pregnancy have been suggested to influence the physical development of offspring, while overall effects haven’t comprehensively evaluated. We aim revise Cardiovascular Health (CVH) metrics for pregnant women, a composite health indicator recommended and updated by American Heart Association in 2022, explore its association with growth status within age 2 years based on birth cohort. Methods: Pregnant women 20-28 weeks gestation were recruited...

Abstract: Pandemic-prevention-themed literature emerged as a sort of "hasty work" (急就章) in combating the COVID-19 pandemic. Within this context, folk art and represent form soft mobilization within rural communities, which can be regarded narrative strategy through assimilation internalization rigid policies. Conversely, those expressions denoting have lost their original critical ironic connotations. This loss intrinsic character (失格) serves to obscure reality potentially trivialize gravity...

Variations in a lake area constitute an important indicator of the modifications hydrology. This paper explores inter-annual variations Poyang Lake during dry seasons occurring within 1961 to 2010 period and further quantifies severity dryness recently endured 2000s. A physically based hydrodynamic model established relation between level. The was calculated using observed water Results indicated average 1,015 km2. There considerable variation minimum that varied from 702.8 km2 1,259.7...

In this work, the kiwifruit branch, a kind of agricultural waste, was reused as raw material to prepare biochar adsorbent for removal Pb(II) from aqueous solution. Then pristine (BC) further modified form acid–alkali (OBC) and chitosan (CBC) enhance adsorption efficiency toward Pb(II). Characterization experiments with SEM, FTIR XRD suggested that surface functional groups crystallization degree OBC CBC were all increased in comparison BC. Batch sorption showed that, compared BC, capacity by...

鄱阳湖属大风区,风场作为仅次于流域五河倾泻和长江顶托作用的另一重要驱动力,或在某些时刻影响局部区域的水流结构,进而影响局部水体中泥沙、污染物、营养盐等物质的输移和扩散.基于鄱阳湖二维水动力数学模型,模拟定常风场条件下的鄱阳湖流场分布及环流形式,并与无风条件下的水流时空结构进行对比.结果表明:3.03m/s的NE向和SSW向定常风对湖泊水位影响微弱;对流速的影响主要集中在7月中旬至9月底的湖相期;其影响区域主要分布在湖区中部大湖面偏西岸及东部湖湾,约占湖泊最大水面积的16%;上述区域出现明显环流,环流结构具有时空异质性特点,环流区流速普遍增至无风时的两倍以上;NE向和SSW向风场产生的环流位置相近,方向相反.相比于以往鄱阳湖水动力研究中对风场的忽略,本次研究揭示了定常风场对鄱阳湖的重点影响区域、影响程度及影响形式,可为泥沙及污染物输移模拟中对风场条件的处理及可能带来的误差与误差的空间分布提供重要依据.;Lake Poyang is a strongly wind-affected region. The wind stress, as the secondary driver...

Thinning plays a vital role in controlling stand density of plantation forests to get quality wood and more ecological function. However, the specific effects thinning on forest biomass connected with age are usually overlooked especially semi-arid regions. Here, we examined individual tree growth chronosequence 20-, 30-, 40-, 50-year-old Chinese pine (Pinus tabulaeformis) plantations Loess Plateau, China. We found that under different managements, both mean diameter at breast height (DBH)...

基于2010年鄱阳湖最新地形，构建精细的鄱阳湖二维水动力数学模型，相同网格下构建1998年地形，分别模拟不同地形条件下2006年枯水年水位、流量时空分布，分析地形变化对水位、流量的影响，阐释地形影响的时空差异. 结果表明：相比1998年，2010年地形由于北部入江通道的下切，相同的2006年水文条件下，水位普遍降低；水位越低，上下游水面坡降越大，受地形影响越明显；低水位最大降幅1~2 m，而高水位最大不超过0.4 m，分别对应湖口9 m以下、15 m以上水位；地形对水位的影响程度都昌 >星子 >棠荫 >康山；都昌至湖口段水头差降低了2 m，水面坡度变缓，棠荫至都昌段水面坡度变陡，康山至湖口水头差基本不变；全年出湖总流量增加了6%；地形变化影响最显著为河道区，影响范围可波及大部分湖区，局部地形的变化使得子湖水面积也存在一定差异. 本研究首次基于水动力模拟量化了鄱阳湖地形变化对水位的影响程度和范围，结果可为水资源管理、江湖关系演变分析、湿地生态环境保护等提供科学参考.;A fine 2D hydrodynamic model of Lake Poyang was used to...

Food security is crucial to world peace. Economic development has posed a great threat the protection of cultivated land. Considering 20 cities in lower Yellow River (AALYR) as study area, this explored spatial evolution land pressure (CLP) and economic from 1998 2018, revealing spatiotemporal coupling characteristics CLP index development. The main results are follows: we discerned that have an obvious consistency during 1998-2018. showed pattern overall stability, well local changes. Most...

Poyang lake floodplains are hydrologically complex and dynamic systems which exhibit dramatic intra-annual wetting drying. The flow regime of the Yangtze River was previously known to play an important role in affecting Lake its extremely productive (river–lake relationship). recent severe declines recessions closely linked changed river–lake relationship, resulting significant hydrological, ecological, economic problems. This study aims examine spatiotemporal heterogeneity floodplain...

In the context of urban expansion and climate change, world is under pressure from multiple ecological risks. Key protection areas play a pivotal role in preserving stability promoting development. Due to its unique geographical conditions, Yellow River basin has been facing huge risk pressure. affected area Lower (AALYR) as an agricultural hub, gradually become key factor restricting development cities agriculture. Taking AALYR example, landscape assessment (LERA) system established based...

This study models emissions quantities and neighboring exposure concentrations of six airborne pollutants, including PM10, PM2.5, crystalline silica, arsenic, uranium, barium, which resulted from the disposal Marcellus shale drill cuttings waste during 2011–2017 period. Using these predicted exposures, this evaluates current setback distances required in Pennsylvania facilities. For potential residents living at perimeter distance, 274 m (900 ft), a rate 612.4 metric tons per day landfills...

在复杂湖泊水动力环境作用下,换水周期和传输时间变化直接影响着污染物的迁移和转化.本文运用数值模拟方法,定量研究了季节水情动态下鄱阳湖换水周期和示踪剂传输时间的空间分布.结果表明,不同季节下鄱阳湖换水周期均具有较高的空间异质性,贯穿整个湖区的主河道换水周期约<10 d,大多湖湾区的换水周期则长达300多天.尽管不同季节下换水周期空间分布格局几乎相似,但受鄱阳湖水动力场的季节变化影响,夏、秋季的换水周期要明显大于春、冬季.基于换水周期频率分布曲线的统计表明,80%的鄱阳湖区的换水周期约<30 d,其余湖区换水周期为几十天至几百天,表明鄱阳湖应该更加确切地描述为一个快速换水和慢速换水同时共存的湖泊系统.鄱阳湖示踪剂传输时间介于4~32 d,夏、秋季的传输时间(11~32 d)约为春、冬季(4~8 d)的4倍,主要与鄱阳湖季节性水情特征及示踪剂的迁移路径有关.本文所获取的换水周期和示踪剂传输时间的时空分布信息可为今后鄱阳湖水质、水环境和生态系统管理和维护等方面提供重要科学参考.;Many physical, chemical and biological processes that...