Phytoremediation is a method of clearing up pollutants from environment by *** has the advantages of low cost,saving land resources and no secondary *** importantly,it does not destroy the ecological *** it has a brig...
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Phytoremediation is a method of clearing up pollutants from environment by *** has the advantages of low cost,saving land resources and no secondary *** importantly,it does not destroy the ecological *** it has a bright future for apply phytoremediation in cleaning the contaminated *** is a herbicide that is widely used in ***(Populus deltoids cv.I-69/55)and transgenic poplar(Populus deltoides × nigra,DN34)in pots were used to test if they remediate atrazine contaminated soil in a greenhouse in this *** degradation dynamic of atrazine was studied in different rhizosphere environment with GC method;the dynamic variation of microbe was investigated to elucidate the rhizosphere effects and mechanism of phytoremediation of Atrazine contaminated soil by transgenic poplar,in the process of *** main results were summarized as follows:1)There was no significant difference in atrazine(the applied concentration was 10 mg·kg-1 in the soil of pots)between the ordinary poplar rhizosphere soil and the non-rhizosphere *** transgenic poplar was able to clean up *** was significant difference in atrazine between the transgenic poplar rhizosphere soil and the non-rhizosphere soil.2)The bacteria in non-rhizosphere soil were significantly inhibited by 10 mg·kg-1 *** number of bacteria,fungi and actinomycosis in rhizosphere soil was more than that in non-rhizosphere *** number of bacteria in transgenic poplar rhizosphere soil remained stable,and was generally more than that in other rhizosphere *** number of actinomycosis was in an order:non-contaminated soil >rhizosphere soil contaminated with atrazine>non-rhizosphere soil contaminated with atrazine.
By using Julian Date methods,this paper studied the changes of forest fire occurring date during 1980～2006 in Inner Mongolia Daxing’anling forest region,as well as discussed the changes of fire season and forest fir...
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By using Julian Date methods,this paper studied the changes of forest fire occurring date during 1980～2006 in Inner Mongolia Daxing’anling forest region,as well as discussed the changes of fire season and forest fire regime under global *** results indicated that Julian Date of fires changed obviously,*** fires Julian Date in spring extended into summer markedly,and at the same time summer fires were mostly caused by lightning *** Julian Date of human-caused fires did not evidently *** recent some years,the forest fires occurred in summer actually exceeded the sum of fires occurred in spring and ***,the fire seasons are not only in spring and autumn,so long as the litter has not been covered by snow,forest fires possibly take *** the future,under a warmer climate,the authors’ suggestion for forest fire management departments is to adequately understand these forest fire regime changes and make adaptive policies,in order to reduce the damage induced by forest fires.
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