细化搜索
结果 1-7 的 7
Watershed-scale assessment of oil palm cultivation impact on water quality and nutrient fluxes: A case study in Sumatra (Indonesia) 全文
2015
Comte I. | Colin F. | Grünberger O. | Whalen J. | Widodo R.H. | Caliman J.P.
High fertilizer input is necessary to sustain high yields in oil palm agroecosystems, but it may endanger neighboring aquatic ecosystems when excess nutrients are transported to waterways. In this study, the hydrochemical dynamics of groundwater and streams under baseflow conditions were evaluated with bi-monthly measurements for 1 year on 16 watersheds. Hydrochemical measurements were related to the spatial distribution of soil and fertilization practices across a landscape of 100 km2, dominated by oil palm cultivation, in Central Sumatra, Indonesia. The low nutrient concentrations recorded in streams throughout the landscape indicated that the mature oil palm plantations in this study did not contribute to eutrophication of aquatic ecosystems. This was ascribed to high nutrient uptake by oil palm, a rational fertilizer program, and dilution of nutrient concentrations due to heavy rainfall in the study area. Soil type controlled dissolved inorganic N and total P fluxes, with greater losses of N and P from loamy-sand uplands than loamy lowlands. Organic fertilization helped to reduce nutrient fluxes compared to mineral fertilizers. However, when K inputs exceeded the oil palm requirement threshold, high K export occurred during periods when groundwater had a short residence time. For higher nutrient use efficiency in the long term, the field-scale fertilizer management should be complemented with a landscape-scale strategy of fertilizer applications that accounts for soil variability. (Résumé d'auteur)
显示更多 [+] 显示较少 [-]Modelling of natural organic matter transport processes in groundwater
1993
Mas-Pla, J. | Yeh, T.C.J. | McCarthy, J.F. | Williams, T.M. (Department of Geology, Autonomous University of Barcelona, Bellaterra (Spain))
[Measurement and modelling of evaporation from a forest area [SVAT modelling, TDR, Time Domain Reflectometry]]
1995
Schelde, K.
The relationship between foliar injury, nitrogen metabolism, and growth parameters in ozonated soybeans
1990
Smith, G. | Neyra, C. | Brennan, E. (Department of Plant Pathology, New Jersey Agricultural Experiment Station, New Brunswick, NJ 08903 (USA))
The effect of liming and Mg-fertilization on uptake, transport and final use of calcium and magnesium in conifers
1993
Guelpen, M. (Freiburg Univ. (Germany). Inst. fuer Forstbotanik und Baumphysiologie) | Tuerk, S. | Fink, S.
Immunohistochemical localization of metallothionein in plant tissues
1991
Chongpraditnun, P. (Tokyo Univ. (Japan). Dept. of Agricultural Chemistry) | Suzuki, K. | Kawaharada, U. | Nakajima, K. | Chino, M.
[Anthrogogenic air pollutants as stress factors of terrestric ecosystems and ways to reduce their damaging effects. Sub programme: effects of lower influences of gaseous pollutants on Norway spruce clones studied in open-top-chambers and in the field]
1990
Debus, R. | Euteneuer-Macher, T.
