杭州湾北岸近岸海域N、P 降解系数的围隔实验研究

通过制作生态系围隔实验装置,采用模拟围隔实验的方法,测定N、P营养盐的降解系数.基于夏秋两季杭州湾北岸近岸海域的现场水样采集,测出杭州湾北岸近岸海域无机氮的生物降解系数在0.121~0.269 d-1范围内,均值为0.225 d-1,测得活性磷酸盐的降解系数在0.031~0.179 d-1,均值为0.08 d-1.考虑到实验室静态模拟环境与真实海区状况的差异,采用保守估计法和 Bosko 公式进行处理,最终计算得出的0.21 d-1和0.05 d-1可分别作为杭州湾北岸海域无机氮和活性磷酸盐的实际降解系数.     

时序InSAR技术在地球环境监测及其资源管理中的应用:以交城-清徐地区为例

利用ALOS-1（2007-2010）、Sentinel-1A（2017-2018）存档数据对山西交城-清徐地区的地面沉降进行监测。结合小基线和永久散射体技术优点，在增加时间采样密度的基础上利用二维线性回归分析得到研究区域的形变速率和时间序列。经同期GPS观测结果校核表明:交城-清徐地区持续发生地面沉降，但山区和平原区域形变的空间分布、量级不同，引起形变原因也不同。平原地带沉降空间分布受构造断裂控制，断裂带两侧呈现明显的差异性形变，且最大沉降速率为－200 mm/a，沉降的主要原因是地下水超采，但经治理后地面沉降灾害有所缓解，表现为沉降速率小于－30 mm/a。山区主要由于矿产资源的长期开采，沉降中心不断向南移动，最大形变速率为－462 mm/a。     

A new simple screening method for the detection of paralytic shellfish poisoning toxins

The current testing for paralytic shellfish poisoning(PSP) in shellfish is based on the mouse bioassay(MBA).To alleviate animal welfare concerns,we evaluated the utility of using sublethal indicators of toxicity as an alternative to measuring time to death.Live mice were injected with a PSP congener and the changes in neurotransmitter levels were measured 60,90,and 120 min after injection.Acetylcholine(ACh) was the most sensitive marker for PSP toxicity.The changes in neurotransmitter levels were most pronounced in the blood.Thus,measurement of Ach levels in the blood may serve as a sensitive predictor for PSP that would not require sacrifice of the mice.This method was relatively simple,sensitive(less than 1 μg/kg weight,equivalent to 20 ng/mL),low maintenance,and rapid(less than 60 min).