The distribution characteristics of nutrients and phytoplankton during the icebound season in Changchun

Samples were collected from the reach between the Hadawan and the Jamusi along the Songhua River to characterize the distribution and speciation of mercury in water and sediments during icebound season in December,2005,and total mercury and its speciation in sediments and water were determined.

The pollution features of the river are the organic pollution seriously in icebound season and most of the toxicants from the point-source.

Songhua River lies in frigid area,the period of ice sealed lasts for five months every year.

Through the analysis of comparative observational data,this paper gets the initial results that the evapo-ration capacity of evaporator E601with half depth in ice age,evaporator D20with depth of 50mm in ice age and non -ice age and evaporator E601have close re lative relations and the conversion factors are more stable.

So,the earth s movement in acceleration should coincide with the low temperature and ice age.

Professor Li Siguang is one of the most earliest scientists who discovered that there were not only glacial stages, but also interglacial stages in China.

This paper introduces the mean daily discharge test in glacial stage in Jingle Hydrological Station,analyzes on the test results,and advances some suggestions on how to calculate the discharge reasonably.

According to the authors new idea, 4 glacier activities in Neoproterozoic Era can be subdivided into four glacial stages and three interglacial stages.

The glaciation was developed in 4 glacial epochs.

ccording to the description of the glader remains and periglacial appearances which we first found in the Bashang area, northwestern of Hebei province, this paper divides the glacial epoches or epiglacial epoches from middle pleistocene to present.

According to the glacial remnants, two glacial epoches can be divided.