A study on the physico-chemical speciation of heavy metals in waters of rivers, and lakes in the Changjiang River Valley, China

GeoJournal ◽  
1996 ◽  
Vol 40 (1-2) ◽  
Author(s):  
Xibao Chen ◽  
Shen Zhang ◽  
Licheng Zhang ◽  
Yanxun Cheng
2011 ◽  
Vol 71-78 ◽  
pp. 3137-3141 ◽  
Author(s):  
Shi Gang Han

By using the sunshine time data from 260 meteorological observation stations in Changjiang river valley from 1960 to 2009, the features of sunshine time in this area are studied. The results show that the highest sunshine time place is Qinghai-Tibet Plateau which is located in the source of the Changjiang river, and the sunshine time is about 2200-3000 h.a-1. The lowest sunshine time place is Sichuan Basin , and the sunshine time is about 1000-1600 h.a-1. The place of middle sunshine time is the midstream and down stream of Changjiang river, and the sunshine time is about 2000 h.a-1. There is a trend of decreasing with the sunshine time in zone 1, and the value is 54.2 h.10a-1. The decreasing value of zone 2 is 38.3h.10a-1. There is a trend of “rise first, down after” with sunshine time in zone 3. There is obvious seasonal difference in sunshine duration,with bigger decreasing amplitude in summer and winter than that in autumn. The variation trend of sunshine time is not obvious in spring.


2016 ◽  
Vol 2 (91) ◽  
pp. 17-21
Author(s):  
S. H. Korsun ◽  
N. I. Dovbash

The aim of the study was to establish changes in the physico-chemical and agrochemical characteristics of gray forest large-clay loamy soil, depending on the contamination of ecotopes by heavy metals. Methods. Field, laboratory, mathematical and statistical. Results. The results of the study of the soil of areas with an over-dimensioned content of heavy metals and the transformation of agrochemical characteristics of gray forest soil in the cultivation of corn for grain. It was established that under conditions of systematic application of mineral fertilizers in agrocenoses, an increase in the lead concentration to 100 mg/kg, cadmium to 2,0, zinc to 50 mg/kg in gray forest soil did not result in a decrease in the amount available forms of nitrogen, phosphorus, potassium by plants, compared with the natural background. Concentration of lead in the amount of 1000 mg/kg, cadmium – 20, zinc – 500 mg/kg marked an increase in exchange and hydrolytic acidity and loss of humus.


2010 ◽  
Vol 30 (3) ◽  
pp. 1-6 ◽  
Author(s):  
Andong WANG ◽  
Shaoming PAN ◽  
Yongzhan ZHANG ◽  
Zhiyong LIU

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