There are 101 species of vascular plants in the vegetations , which belong to 77 generas and 31 families 在濕地植被的區(qū)系組成中,共有維管植物101種,隸屬于31科77屬。
The hygrophyte , the hydrophyte and the mesophyte play an important role in the floristic elements . north temperate type ( 29 generas ) is account for dominant position in the floristic geographical elements of genera 在各類(lèi)植物區(qū)系地理成分中,北溫帶分布屬( 29屬)具有明顯優(yōu)勢(shì),說(shuō)明該地區(qū)濕地植物區(qū)系具有明顯的溫帶特征。
During this time both the monthly average algae density and lasting time increased year after year . the main algae forming algae bloom was cyanophyta and the dominant generas were microcystis . the accumulation of nutrients ( such as total nitrogen and total phosphorus ) with high concentration , high temperature of water and strong sunshine caused the algae bloom 結(jié)果表明,水溫較高的夏秋季(一般為7 9月)是天津市城市供水水源的藻類(lèi)高發(fā)期;近幾年,高藻期含藻量呈逐年增加趨勢(shì),持續(xù)時(shí)間呈逐年延長(zhǎng)趨勢(shì);高藻期水源水以藍(lán)藻為主,所占藻類(lèi)總數(shù)最高和最低比例分別為91和70 ,其中的優(yōu)勢(shì)屬為微囊藻屬;水源水中高含量的氮、磷等營(yíng)養(yǎng)鹽是藻類(lèi)高發(fā)的內(nèi)在因素,水溫、光照等是外在誘發(fā)因素。