Tao S, Liu W X, Chen Y J, Xu F L, Dawson R W, Li B G, Cao J, Wang X J, Hu J Y, Fang J Y
Department of Urban and Environmental Sciences, Laboratory for Earth Surface Processes, Peking University, Beijing 100871, PR China.
Environ Pollut. 2004 May;129(1):5-12. doi: 10.1016/j.envpol.2003.10.001.
Major factors influencing the root-induced copper fractionation changes within the rhizosphere of maize, wheat, pea, and soybean seedlings were evaluated using a contaminated calcareous soil. The effects of acidification, alkalization, and introduction of root exudates were investigated by addition of acid, alkaline and root exudates from solution cultures, prior to incubation and copper fractionation. Raw and sterilized soils were compared for changes of copper fractionation in the rhizosphere using rhizoboxes with maize, wheat, pea and soybean seedlings. The results indicated that the general trend in considerable changes was similar among the plant species studied. The rhizosphere experienced a depletion of carbonate associated and organic bound copper along with an accumulation of exchangeable and Fe-Mn oxide bound copper. The resulting significant influence of root exudates on copper fractionation appears to have been produced through complexation rather than acidification or alkalization. The increase in exchangeable copper in rhizosphere was strengthened by microorganisms.
使用受污染的石灰性土壤评估了影响玉米、小麦、豌豆和大豆幼苗根际中根诱导的铜分馏变化的主要因素。在培养和铜分馏之前，通过添加来自溶液培养物的酸、碱和根系分泌物，研究了酸化、碱化和根系分泌物引入的影响。使用装有玉米、小麦、豌豆和大豆幼苗的根箱，比较了原状土壤和灭菌土壤根际中铜分馏的变化。结果表明，在所研究的植物物种中，相当大变化的总体趋势相似。根际中与碳酸盐结合和有机结合的铜减少，同时可交换的和铁锰氧化物结合的铜积累。根系分泌物对铜分馏产生的显著影响似乎是通过络合而不是酸化或碱化产生的。根际中可交换铜的增加因微生物而增强。
