Li Lanhai

Plant algae method for arsenic removal from arsenic contaminated groundwater

Field studies were carried out in Urumqi River Basin in Northwest China. The study focused on experimentation on a plant algae method that was tested by taking various water chemistries into consideration. The results from a greenhouse experiment evaluated for four doses of P (0, 100, 200, and 300 μmol/L) using two ferns (30 and 60 day old) on 15 L of contaminated groundwater per plant revealed that the biomass of 30-day old ferns gained was higher than 60-day fern. As solution-P increased from 0 to 450 μmol/L, Phosphorus concentration in the fronds increased from 1.9 to 3.9 mg/kg and 1.95 to 4.0 mg/kg for 30-d and 60-d ferns respectively. This study showed that the plant algae method may be a good solution to maximize arsenic uptake in the short term under normal climatic conditions.

Study on productivity of epilithic algae in Urumqi River Basin in Northwest China

The primary objective of this study was to make a deep investigation on the concentration of chlorophyll a and ash-free dry mass (AFDM) estimates for algae growing on stones in Urumqi River located in an arid region of northwest China. The study was conducted on three sites. A highly improved method for measuring primary productivity in situ was used to estimate the primary production of algae growing on rocks (or algae epilithic) deposited in surface water. The results showed a low biomass with mean chlorophyll a content that was estimated at 5.9 mg/m 2 in the Urumqi River. Of the three sites studied, the mean gross primary productivity of periphyton was 394.89 mgC/m 2 day and AFDM 344.75 mg/m 2 . The

An assessment of the spatial distribution of Pentecost churches in an African urban environment: A case study of Lubumbashi City in the Democratic Republic of the Congo

This paper presents the results of the study undertaken at Lubumbashi City in D.R.Congo to determine the spatial distribution and evolution of Pentecost churches in Africa urban environment. It was shown that in Lubumbashi City the Pentecost Churches were grown from 112 churches in 1990 to 280 Churches in 2008. Four Church Community groups were identified which are 8th CEPAC (19 churches), 30th CEPECO (102 churches), 45th CEP (39 churches) and RESURGENCE CHURHCES (120 churches). The last cited knew a high proliferation and grew from 24 Churches to 120 Churches in the same period. The analysis of their spatial distribution by using the Distribution Model showed that the concentration of spatial distribution is R=0.416. The study of correlation between the number of Churches, the number of population and the area by using the formula of correlation coefficient shows that no correlation exists for their distribution. The need of money, accessibility and good environment were a basis of their proliferation. Finally we addressed the advices and proposed an appropriate method to all actors in order to establish a harmony in urban environment.

Study of impacts of floods on the water quality in an arid zone: the case of the Tarim River in Northwest China

This paper presents the results of the study undertaken at the Tarim River Basin in Northwest China to analyze impacts of flooding on water quality. It was shown that irregular rainfall was the cause of flash floods that affected many ecosystems and eroded soils. Simulation results and the existence of relationships between flood volume and flood peak allowed potential model application that included flood peak estimation. The analysis of water pollution through sample sediment was helped by spectroscopy techniques and it was found that the flood was the main cause of many chemical elements in water. The floods affected the quality of water in the Tarim River where it was slightly basic with pH = 8.1 before flooding and acidic with pH = 6.9 after flooding.

Erosion control verification: “Method of hole”

This study was undertaken to assess the erosion control verification. The intensity analysis using method of hole by capturing of water flow on mountainsides was a good indication for verification. It showed that the speed of this water was reduced from 1 hour in April 2007 to 7 hours 12 minutes in April 2008 in Rwanda where radical terraces were the main method for erosion control. In Xinjiang, the intensity of erosion varied between 7 hours 23 minutes and 10 hours 7 minutes from January to December 2009. Finally we proposed this strategy for all different parts of the whole world where erosion is still a big challenge to assess its intensity in order to preserve its consequences in the environment.

A Study of Retrieval Land Surface Temperature and Evapotranspiration in Response to LUCC Based on Remote Sensing Data in Sanggong River

The condition of land use/cover change (LUCC) is an important influence factor of the land surface temperature (LST) and the evapotranspiration (ET). Herein LST and ET were retrieved by Qin et al’s mono-window algorithm and SEBAL model, respectively, based on landsat TM/ETM+ data. The analysis of retrieval result indicated that the change of the land use/cover was remarkable during 9 years from 1990 to 1999 in the Sangong River in Fukang of Xinjiang province. The land use/cover characteristics mainly controlled the spatial distribution of the LST and ET. The distributions of LST and ET were all a single-apex model over different land use/cover. The frequency distribution characteristic of LST in 1999 was roughly consistent with those in 1990, but the change ranges of LST over different land use/cover in 1999 were large than those in 1990. ET has presented the same change characteristic, and the day ETs of 1999 over different land use/cover were larger than those of 1990.The results demonstrate that LST possessed evidently negative correlation with the ET for all land cover types.