[Objective]The paper was to screen pesticide that could effectively control Latoia pastorlis （Butler）, and provide reference for its utilization in fields. [Method]The indoor control efficacy of 25% benzoylphenal ur...[Objective]The paper was to screen pesticide that could effectively control Latoia pastorlis （Butler）, and provide reference for its utilization in fields. [Method]The indoor control efficacy of 25% benzoylphenal urea, 30% trichlorfon, 16 000 IU/mg Bacillus thuringiensis and Beauveria bassiana on 2-3 instars larvae of L. pastorlis were determined, and the indoor toxicity of 25% benzoylphenal urea and crystal trichlorfon on shrimp was also tested. [Result]Four pesticides all had insecticidal effects on 2-3 instars larvae of L. pastorlis, of which 30% trichlorfon 800, 1 000 and 1 500 times and 25% benzoylphenal urea 800 times had the best control effect. Crystal trichlorfon with the concentrations of 0.500, 0.100, 0.010 mg/L and 25% benzoylphenal urea 8 000, 10 000, 15 000 times had little or no impact on shrimp, respectively.[Conclusion] 30% Trichlorfon was rapidly available with small impact on shrimp, which were suitable for emergency use or daily control of L. pastorlis. 25% Benzoylphenal urea and 16 000 IU/mg B. thuringiensis had relatively slow insecticidal effect, which was suitable for daily control of L. pastorlis.展开更多
This paper reports the absorption,accumulation,distribution and cycle of Cu,Pb,Zn,Cr and Ni in S.apetala+S.caseolaris,mangrove community at Futian Mangrove Nature Reserve of Shenzhen,The Cu,Pb,Zn,Cr and Ni contents in...This paper reports the absorption,accumulation,distribution and cycle of Cu,Pb,Zn,Cr and Ni in S.apetala+S.caseolaris,mangrove community at Futian Mangrove Nature Reserve of Shenzhen,The Cu,Pb,Zn,Cr and Ni contents in forest soil increase from bottom to surface layers,and the storage of the five heavy metals in the surface layer(depth0-30cm)is Zn>Pb>Ni>Cr>Cu.The concentration ability is S.caseolaris>S.apetala>K.candel.The existing accumulation of Cu,Pb,Zn,Cr and Ni in the community is 23019.63μg/m^2,23429.66μg/m^2.177870.42μg/m^2,6835.80μg/m^2,and 12995.22μg/m^2,respectively.The annual absorption is 6592.57μg/m^2,2664.80μg/m^2,23123.56μg/m^2,853.24μg/m^2,and 1990.95μg/m^2,respectively.The annual return is 3179.50μg/m^2,1300.65μg/m^2,7401.31μg/m^2,398.99μg/m^2,and 646.20μg/m^2 respectively.The annual net retention accumulation of Cu,Pb,Zn,Cr and Ni in the community is 3413.07μg/m^2,1364.15μg/m^2,15722.25μg/m^2,454.25μg/m^2,and 1344.75μg/m^2,respectively,The turn over periods of Cu,Pb,Zn,Cr and Ni are 8,19,15,18and 21 years,respectively.展开更多
基金Supported by Research Projects of Guangxi Academy of Forestry[GLKZ(2009)No.12]
文摘[Objective]The paper was to screen pesticide that could effectively control Latoia pastorlis （Butler）, and provide reference for its utilization in fields. [Method]The indoor control efficacy of 25% benzoylphenal urea, 30% trichlorfon, 16 000 IU/mg Bacillus thuringiensis and Beauveria bassiana on 2-3 instars larvae of L. pastorlis were determined, and the indoor toxicity of 25% benzoylphenal urea and crystal trichlorfon on shrimp was also tested. [Result]Four pesticides all had insecticidal effects on 2-3 instars larvae of L. pastorlis, of which 30% trichlorfon 800, 1 000 and 1 500 times and 25% benzoylphenal urea 800 times had the best control effect. Crystal trichlorfon with the concentrations of 0.500, 0.100, 0.010 mg/L and 25% benzoylphenal urea 8 000, 10 000, 15 000 times had little or no impact on shrimp, respectively.[Conclusion] 30% Trichlorfon was rapidly available with small impact on shrimp, which were suitable for emergency use or daily control of L. pastorlis. 25% Benzoylphenal urea and 16 000 IU/mg B. thuringiensis had relatively slow insecticidal effect, which was suitable for daily control of L. pastorlis.
文摘This paper reports the absorption,accumulation,distribution and cycle of Cu,Pb,Zn,Cr and Ni in S.apetala+S.caseolaris,mangrove community at Futian Mangrove Nature Reserve of Shenzhen,The Cu,Pb,Zn,Cr and Ni contents in forest soil increase from bottom to surface layers,and the storage of the five heavy metals in the surface layer(depth0-30cm)is Zn>Pb>Ni>Cr>Cu.The concentration ability is S.caseolaris>S.apetala>K.candel.The existing accumulation of Cu,Pb,Zn,Cr and Ni in the community is 23019.63μg/m^2,23429.66μg/m^2.177870.42μg/m^2,6835.80μg/m^2,and 12995.22μg/m^2,respectively.The annual absorption is 6592.57μg/m^2,2664.80μg/m^2,23123.56μg/m^2,853.24μg/m^2,and 1990.95μg/m^2,respectively.The annual return is 3179.50μg/m^2,1300.65μg/m^2,7401.31μg/m^2,398.99μg/m^2,and 646.20μg/m^2 respectively.The annual net retention accumulation of Cu,Pb,Zn,Cr and Ni in the community is 3413.07μg/m^2,1364.15μg/m^2,15722.25μg/m^2,454.25μg/m^2,and 1344.75μg/m^2,respectively,The turn over periods of Cu,Pb,Zn,Cr and Ni are 8,19,15,18and 21 years,respectively.
