2019-2020年上海地区空气质量变化特征及气象影响因素分析

利用2019-2020年上海地区6种空气污染物小时浓度和逐日空气质量分指数(IAQI)的监测资料,统计分析了上海地区空气质量变化特征及其气象因素的影响.结果表明,2020年上海地区空气质量优良率达86.9％,空气质量状况优于2019年.上海地区AQI具有冬季最差,秋季最好的季节特征,最主要的污染物已由过去的PM2.5转...     

践行“三个代表” 深扎为民服务的思想根子

读了《仗义执言，为了心中那杆平衡的天平》通讯和周明厅长的批示后，做为一名基层国土资源管理人员我感受颇深。结合多年的工作实践，今天我粗浅的谈论一下自己的看法和认识。     

试论我国数字电路读图的现状和应用

本文从介绍国内数字电路读图方法的入手,着重介绍了它的现状和实际应用。     

涡旋初始化对T639模式热带气旋路径预报影响的数值试验

为了探讨涡旋初始化对T639L60模式热带气旋路径预报的影响程度,以1002号台风康森为个例进行数值试验,结果表明:在涡旋初始化中采用新的初始涡旋形成技术,能减小TC路径预报误差;从初始涡旋形成方案中通过改变七级风半径、涡旋外围尺度半径大小参数和有无进行涡旋强度调整方案进行敏感性试验,得到TC路径的预报对TC涡旋外围半径和TC强度较敏感,其路径会因涡旋外围半径大小和其强度的不同而有所差异。     

江苏小庙洪牡蛎礁大型底栖动物多样性及群落结构

基于2011年春季的生态调查资料,报道了江苏小庙洪自然潮间带牡蛎礁大型底栖动物的多样性及其群落结构。通过16SrDNA基因序列分析发现,在小庙洪牡蛎礁内分布有3种牡蛎(熊本牡蛎Crassostrea sikamea、近江牡蛎C.ariakensis和密鳞牡蛎Ostrea denselamellosa),其中分布于潮间带区的造礁活体牡蛎为熊本牡蛎,其平均密度和生物量分别为(2199±363)ind/m2和(12361±1645)g/m2。在该牡蛎礁内记录到定居性大型底栖动物(不包括3种牡蛎)共计43科66种,礁体大型底栖动物的总栖息密度和生物量分别达到(2830±182)ind/m2和(499.59±35.41)g/m2,显著高于邻近的软相潮间带泥(沙)质滩涂[密度(102±29)ind/m2;生物量(53.10±22.80)g/m2]和潮下带泥滩[密度(140±60)ind/m2;生物量(43.23±22.37)g/m2](P<0.001)。     

Stable isotopes in aquatic food web of an artificial lagoon in the Hangzhou Bay, China

Stable isotope values, δ¹³C and δ¹⁵N, were determined for four primary producers and 19 dominant consumers in a small artificial lagoon located in Hangzhou Bay. Based on these results the major pathways for energy flow and trophic structure of the artificial lagoon ecosystem were characterized. The mean δ¹³C values for the 19 consumers ranged from −22.99‰ to −14.24‰. Apart from so-iny mullet Liza haematocheila, the other 18 consumers had intermediate δ¹³C values between those of epibenthic microalgae and particulate organic matter (POM). The results of a multiple source linear mixing model (IsoSource model) indicated that 50% or more of the organic carbon in the tissues of most consumers was derived from epibenthic microalgae. This indicated that these primary producers were the main food source fueling the lagoon food web. The mean δ¹⁵N values for the 19 consumers varied between 4.93‰ and 12.97‰ and indicated four trophic levels in the lagoon. Four macroinvertebrates and zooplankton represented the primary consumers, whilst the other 14 consumers occupied the secondary and tertiary consumer levels. The 19 consumers were divided into three trophic guilds (detritivores/suspension feeders, omnivores and carnivores).     

南黄海昨晨地震 本市近期内不会发生破坏性地震

据上海市地震局地震台网测定,昨天晨4点25分42秒,在东经121.5°度,北纬32.4°度的南黄海海域,发生里氏4.7级地震.本市虹口、杨浦、吴凇、宝山、崇明等十多个区、县均有不同程度的震感.据地震局领导同志介绍,上海在短时期内没有明显的迹象表明有发生破坏性地震的可能.据地震局综合各方面资料后判断,自