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Two incubation experiments were conducted to evaluate differences in the microbial use of non-contaminated and heavy metal contaminated nettle (Urtica dioica L.) shoot residues in three soils subjected to heavy metal pollution (Zn, Pb, Cu, and Cd) by river sediments. The microbial use of shoot residues was monitored by changes in microbial biomass C, biomass N, biomass P, ergosterol, N mineralisation, CO(2) production and O(2) consumption rates. Microbial biomass C, N, and P were estimated by fumigation extraction. In the non-amended soils, the mean microbial biomass C to soil organic C ratio decreased from 2.3% in the low metal soil to 1.1% in the high metal soils. In the 42-d incubation experiment, the addition of 2% nettle residues resulted in markedly increased contents of microbial biomass P (+240%), biomass C (+270%), biomass N (+310%), and ergosterol (+360%). The relative increase in the four microbial properties was similar for the three soils and did not show any clear heavy metal effect. The contents of microbial biomass C, N and P and ergosterol contents declined approximately by 30% during the incubation as in the non-amended soils. The ratios microbial biomass C to N, microbial biomass C to P, and ergosterol to microbial biomass C remained constant at 5.2, 26, and 0.5%, respectively. In the 6-d incubation experiment, the respiratory quotient CO(2)/O(2) increased from 0.74 in the low metal soil to 1.58 in the high metal soil in the non-amended soils. In the treatments amended with 4% nettle residues, the respiratory quotient was constant at 1.13, without any effects of the three soils or the two nettle treatments. Contaminated nettle residues led generally to significantly lower N mineralisation, CO(2) production and O(2) consumption rates than non-contaminated nettle residues. However, the absolute differences were small. 相似文献
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Mehmood Khalid Mushtaq Sana Bao Yansong Saifullah Bibi Sadia Yaseen Muhammad Khan Muhammad Ajmal Abrar Muhammad Mohsin Ulhassan Zaid Fahad Shah Petropoulos George P. 《Environmental science and pollution research international》2022,29(35):52618-52634
Environmental Science and Pollution Research - As a result of extreme modifications in human activity during the COVID-19 pandemic, the status of air quality has recently been improved. This... 相似文献
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Riaz Umair Murtaza Ghulam Saifullah Farooq Muhammad Aziz Humera Qadir Ayesha Abdul Mehdi Shahzada Munawar Qazi Muhammad Akram 《Environmental science and pollution research international》2020,27(32):39742-39752
Environmental Science and Pollution Research - In the developing world, rapid urbanization and industrialization produces an enormous volume of wastes daily. This study was aimed to explore the... 相似文献
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Inhibitory effects of copper on marine dinoflagellates 总被引:1,自引:0,他引:1
S. M. Saifullah 《Marine Biology》1978,44(4):299-308
The effect of copper on three species of marine dinoflagellates [Scrippsiella faeroense (Paulsen) Balech et Soares, Prorocentrum micans Ehrenberg, Gymnodinium splendens Lebour] was studied. It inhibited the growth of all species and was lethal to one species in batch cultures. The effect was more pronounced in semicontinuous culture than in batch cultures. Chlorophyll concentrations and rate of uptake of radioactive carbon by cells of S. faeroense were affected in a manner similar to cell numbers. Copper inhibited growth of cells, most probably either by arresting cell division or by penetrating inside the cell and affecting metabolism. 相似文献
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Waleed Muhammad Ahmad Sajid Rashid Javed Muhammad Asif Samiullah Saifullah 《Environmental science and pollution research international》2020,27(32):39832-39840
Environmental Science and Pollution Research - This study explores the opportunities for irrigated agriculture in Khyber District of Former Federally Administered Tribal Area (FATA). Agriculture... 相似文献
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