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Distribution and Migration of Heavy Metals in Undisturbed Forest Soils:A High Resolution Sampling Method 被引量:13
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作者 RUAN Xin-Ling ZHANG Gan-Lin +1 位作者 NI Liu-Jian HE Yue 《Pedosphere》 SCIE CAS CSCD 2008年第3期386-393,共8页
The vertical distribution and migration of Cu,Zn,Pb,and Cd in two forest soil profiles near an industrial emission source were investigated using a high resolution sampling method together with reference element Ti.On... The vertical distribution and migration of Cu,Zn,Pb,and Cd in two forest soil profiles near an industrial emission source were investigated using a high resolution sampling method together with reference element Ti.One-meter soil profile was sectioned horizontally at 2 cm intervals in the first 40 cm,5 cm intervals in the next 40 cm,and 10 cm intervals in the last 20 cm.The migration distance and rate of heavy metals in the soil profiles were calculated according to their relative concentrations in the profiles,as calibrated by the reference element Ti.The enrichment of heavy metals appeared in the uppermost layer of the forest soil,and the soil heavy metal concentrations decreased down the profile until reaching their background values.The calculated average migration rates of Cd,Cu,Pb,and Zn were 0.70,0.33,0.37,and 0.76 cm year-1,respectively,which were comparable to other methods.A simulation model was proposed,which could well describe the distribution of Cu,Zn,Pb,and Cd in natural forest soils. 展开更多
关键词 DISTRIBUTION heavy metals high resolution sampling method migration rate
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Soil Properties in Coniferous Forest Stands Along a Fly Ash Deposition Gradient in Eastern Germany 被引量:5
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作者 S. KLOSE F. MAKESCHIN 《Pedosphere》 SCIE CAS CSCD 2005年第6期681-694,共14页
Physical, chemical, and microbial properties of forest soils subjected to long-term fly ash depositions were analyzed in spruce (Picea abies (L.) Karst.) stands of eastern Germany on three forest sites along an emissi... Physical, chemical, and microbial properties of forest soils subjected to long-term fly ash depositions were analyzed in spruce (Picea abies (L.) Karst.) stands of eastern Germany on three forest sites along an emission gradient of 3 (high input), 6, and 15 km (low input) downwind of a coal-fired power plant. Past emissions resulted in an atypical high mass of mineral fly ash constituents in the organic horizons at the high input site of 128 t ha-1 compared to 58 t ha-1 at the low input site. Magnetic susceptibility measurements proved that the high mineral content of the forest floor was a result of fly ash accumulation in these forest stands. Fly ash deposition in the organic horizons at Site I versus III significantly increased the pH values, effective cation exchange capacity, base saturation and, with exception of the L horizon, concentrations of mobile heavy metals Cd, Cr, and Ni, while stocks of organic C generally decreased. A principal component analysis showed that organic C content and base status mainly controlled soil microbial biomass and microbial respiration rates at these sites, while pH and mobile fractions of Cd, Cr, and Ni governed enzyme activities. Additionally, it was hypothesized that long-term fly ash emissions would eventually destabilize forest ecosystems. Therefore, the results of this study could become a useful tool for risk assessment in forest ecosystems that were subjected to past emissions from coal-fired power plants. 展开更多
关键词 coniferous forests fly ash deposition magnetic susceptibility microbial biomass mobile heavy metal fraction
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红色三兄弟
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作者 史研 《福建党史月刊》 2008年第12期43-43,共1页
1929年,闽粤赣三省之敌对闽西进行“会剿”。为粉碎敌人的阴谋,暴动后的才溪进行第一次“扩红”,年轻人纷纷报名。
关键词 林金堂 林金森 林金香 革命烈士
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