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1.
Ku Yuedong Yang Jianhong Fang Huaiying Xiao Wen Zhuang Jiangteng 《Journal of Material Cycles and Waste Management》2021,23(1):84-95
Journal of Material Cycles and Waste Management - The traditional construction and demolition waste (CDW) treatment process adopts the method of crushing and screening after mixing and combines the... 相似文献
2.
Effect of lime application on microbial community in acidic tea orchard soils
in comparison with those in wasteland and forest soils 总被引:1,自引:0,他引:1
Lime application is a conventional technology to control acidification in tea orchard soils. We investigated the e ect of lime
application on soil microbial community diversity in the soils of three tea orchards, wasteland and forest. The BIOLOG data showed
that both the average well color development of all carbon sources and the functional diversity index increased with the liming rate in
the tea orchards and the forest, but decreased in the wasteland. The phospholipid fatty acid (PLFA) analysis showed that the structural
diversity index of soil microbial community increased with the liming rate in all the tea orchards, the wasteland and the forest. Lime
application also increased the soil-bacterial PLFA content in all the soils. Soil fungal and actinomycete PLFAs in the tea orchards
showed an increasing trend from 0 to 3.2 g CaCO3/kg application and then a decreasing trend from 3.2 to 6.4 g CaCO3/kg application.
The principal component analysis of BIOLOG and PLFA data suggested that lime application had a significant e ect on soil microbial
community structure, and land use had a greater e ect on soil microbial community structure compared to lime application. 相似文献
3.
Nitrification potentials of Chinese tea orchard soils and their adjacent
wasteland and forest soils 总被引:1,自引:0,他引:1
To investigate the nitrifying activities of di erent soil types, soil samples collected from 8-, 50- and 90-year old tea orchards, the
adjacent wasteland, and 90-year old forest were measured for their nitrification potentials using the conventional soil incubation and the
liquid incubation method. Among di erent soil types, the nitrification potential of soil in tea orchards was higher than that of wasteland
and forest soils. The slurry shaken liquid incubation method was confirmed to be more accurate and have reliable results than the
soil incubation. Interestingly, experimental result revealed that the generally applied pH value of 7.2 for the liquid media was not the
optimal pH for these acid soils with a strong bu er capacity. This suggested that tea orchard soils may have nitrifiers requiring pHneutral
condition for the best activity. Our data also showed that treatment with the commonly used nitrogen fertilizer urea significantly
improved nitrification potential of the soils; such enhancement e ect was stronger on all of three tea orchard soils than on wasteland
and forest soils, and also stronger on the younger (8- and 50-year old) tea orchard soils than on the older one (90-year old). 相似文献
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5.
Ali Neelum Khan Sardar Khan Muhammad Amjad Waqas Muhammad Yao Huaiying 《Environmental science and pollution research international》2019,26(9):8808-8820
Environmental Science and Pollution Research - A comprehensive study was conducted to appraise the concentrations of 30 endocrine disrupting pesticides (EDPs) in soil and vegetable samples... 相似文献
6.
以铜锌冶炼厂附近的水稻土为例 ,研究了重金属复合污染对土壤微生物群落的影响 .结果表明 ,有效铜、锌、镉、铅与微生物生物量碳、微生物生物量氮、微生物商、微生物生物量氮 全氮均呈显著负相关 .重金属污染均能降低细菌、真菌和放线菌的数量 .用BIOLOG生态盘研究了重金属污染对微生物群落结构的影响 ,发现重金属污染明显影响了微生物群落结构 ,反映在典型变量 1(CV1)与重金属元素含量呈极显著正相关 ,因此认为典型变量 1是反映重金属污染程度的有效指标 .经逐步回归分析发现 ,有效铜是影响典型变量 1最主要的因素 . 相似文献
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8.
气提式内循环膜生物反应器试验研究 总被引:2,自引:0,他引:2
针对膜生物反应器存在的膜污染和能耗高的问题,结合气提式内循环和一体式膜生物反应器处理废水的工艺特点,提出圆柱形套筒气提式内循环膜生物反应器。试验结果表明,同等曝气强度和曝气方式下,气提式内循环膜生物反应器中氧传质系数(KLa)高于一般膜生物反应器;膜间水流流速是一般膜生物反应器的1.53~2.44倍,提高了膜面的水力冲刷作用,可减缓膜污染;对反应器膜过滤性能的考察,表明气提式内循环膜生物反应器较一般膜生物反应器有更好的膜过滤性能和抗污染能力。反应器中添加内循环,污泥活性有所下降,但对实际废水的去除效果影响不大,污泥活性较为稳定。 相似文献
9.
Effects of lead and cadmium nitrate on biomass and substrate utilization pattern of soil microbial communities 总被引:10,自引:0,他引:10
A study was conducted to evaluate the effects of different concentrations of lead (Pb) and cadmium (Cd) applied as their nitrates on soil microbial biomass carbon (C(mic)) and nitrogen (N(mic)), and substrate utilization pattern of soil microbial communities. The C(mic) and N(mic) contents were determined at 0, 14, 28, 42 and 56 days after heavy metal application (DAA). The results showed a significant decline in the C(mic) for all Pb and Cd amended soils from the start to 28 DAA. From 28 to 56 DAA, C(mic) contents changed non-significantly for all other treatments except for 600 mgkg(-1) Pb and 100 mgkg(-1) Cd in which it declined significantly from 42 to 56 DAA. The N(mic) contents also decreased significantly from start to 28 DAA for all other Pb and Cd treatments except for 200 mgkg(-1) Pb which did not show significant difference from the control. Control and 200 mgkg(-1) Pb had significantly lower soil microbial biomass C:N ratio as compared with other Pb treatments from 14 to 42 DAA, however at 56 DAA, only 1000 mgkg(-1) Pb showed significantly higher C:N ratio compared with other treatments. No significant difference in C:N ratio for all Cd treated soils was seen from start to 28 DAA, however from 42 to 56 DAA, 100 mgkg(-1) Pb showed significantly higher C:N ratio compared with other treatments. On 56 DAA, substrate utilization pattern of soil microbial communities was determined by inoculating Biolog ECO plates. The results indicated that Pb and Cd addition inhibited the functional activity of soil microbial communities as indicated by the intensity of average well color development (AWCD) during 168 h of incubation. Multivariate analysis of sole carbon source utilization pattern demonstrated that higher levels of heavy metal application had significantly affected soil microbial community structure. 相似文献
10.
不同相伴阴离子对镉污染红壤微生物区系及群落功能多样性的影响 总被引:8,自引:1,他引:8
通过外加醋酸镉和氯化镉的室内培养试验研究了不同相伴阴离子对镉污染红壤中微生物区系及群落功能多样性的影响 .结果表明 :在相同镉浓度下相伴OAc-对镉污染红壤的细菌、放线菌和真菌数量及微生物群落功能多样性的抑制作用大于相伴Cl-.统计分析显示 ,在供试红壤中OAc-与Cl-对其微生物区系及微生物群落代谢剖面 (AWCD值 )、Shannon指数的影响均达到显著差异 (P <0 0 5 ) ,且在红砂土上表现更为明显 .外加醋酸钾和氯化钾的培养试验结果表明 ,阳离子为钾时 ,相伴OAc-与Cl-对红壤微生物区系结构及群落功能多样性没有产生明显抑制作用 ,相伴OAc-甚至存在一定的刺激作用 .可见 ,相伴OAc-对镉污染红壤微生物的毒害作用大于相伴Cl-,其原因并非是阴离子本身的毒性效应 ,而镉的生物有效性变化可能是不同相伴阴离子镉盐导致毒性差异的原因之一 . 相似文献