خيارات البحث
النتائج 1 - 8 من 8
Metal uptake from contaminated soils by some plant species - radish, lettuce, dill
2013
Stapkevica, M., University of Latvia, Riga (Latvia) | Vincevica-Gaile, Z., University of Latvia, Riga (Latvia) | Klavins, M., University of Latvia, Riga (Latvia)
Plants are components of ecosystem that transfer elements from abiotic to biotic environments. Several elements, such as As, Cd, Hg, Pb, can be considered as food chain contaminants. Simultaneously, some essential micronutrients (e.g., Cu, Cr, Ni, Zn) at high concentrations may become toxic to both, plants and animals. To secure the aim to describe the uptake of metals by food crop species such vegetables, as radish Raphanus sativus L., leafy lettuce Lactuca sativa L. and dill Anethum graveolens L., were grown in soils of various grading composition and type. There were five soil types selected. A part of soils was contaminated with copper sulphate solution at different target concentrations, while another part was contaminated with mixture of metal (Pb, Cd, Cu, Zn) compounds. In half of treated soil samples the solution of humic substances was added. Harvested vegetables were dried, and after wet digestion with nitric acid quantitative analysis of metal concentrations was performed by use of atomic absorption spectrometry. The highest concentration of copper was detected in vegetable samples grown in soils with less organics, thereby indicating the importance of soil organic matter to metal transfer routes and accumulation rates in plants. Analysis of lettuce grown in soils contaminated with the mixture of metal compounds revealed that zinc was a metal absorbed more intensively, but metal uptake and accumulation was less intensive from peat if compared with other soils.
اظهر المزيد [+] اقل [-]Ecological and socio-economic impacts of modified shifting cultivation in Northeast India
2001
Tiwari, B.K. (North Eastern Univ., Shillong 793014 (India). Centre for Environmental Studies)
Shifting cultivation practices of the Hanunuo Mangyans [ethnic groups]: Mindoro Island, Philippines
2001
Castro, N.T. (Philippines Univ. Diliman, Diliman, Quezon City (Philippines). Dept. of Anthropology)
Role of fallow in household livelihood strategies
2001
Burgers, P. (International Center for Research in Agroforestry, Jl. Cifor, Situ Gede, Sindang Barang, P.O. Box 161, Bogor 6001 (Indonesia))
Role of Homo sapiens in the forests
2001
Rice, D. (Kalahan Educational Foundation, Inc. Imuyan, Santa Fe, Nueva Viscaya (Philippines))
Managing alder for improved shifting cultivation in Nagaland, India
2001
Darlong, V.T. (Ministry of Environment and Forests, N.E. Regional Office, Upland Road Shiltong 793003 (India))
Biological rejuvenation of jhumland soils
2001
Prasad, K.G. (Institute of Rain and Moist Deciduous Forests Research, Van Vihar, P.O. Box 136, Jorhat 785001, Assam (India))
Crop-animal systems in the hilly regions of Lao PDR
2001
Roder, W. | Phengchanh, S. | Keoboulapha, B. | Maniphone, S.
