scholarly journals Leaching of Colloidal Matter and Dissolved Organic Carbon from Surface Soil Columns during Multiple Irrigation Periods.

2002 ◽  
pp. 61-76
Author(s):  
Masaharu MOTOSHITA ◽  
Toshiko KOMATSU ◽  
Satoshi GESHO ◽  
Per MOLDRUP ◽  
Noriatsu OZAKI ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Surface Soil ◽  
Soil Columns ◽  
Colloidal Matter

Transport of organochlorine pesticides in soil columns enhanced by dissolved organic carbon

1997 ◽  
Vol 35 (7) ◽  
pp. 139-145 ◽  
Author(s):  
Jiann-Yuan Ding ◽  
Shian-Chee Wu
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Organochlorine Pesticides ◽  
Transport Model ◽  
Phase Model ◽  
Soil Columns ◽  
Two Phase ◽  
Three Phase ◽  
Phase Transport ◽  
Remediation Of Soil

The objective of this study is to quantify the effects of humic acid solution infiltration on the transport of organochlorine pesticides (OCPs) in soil columns using a three-phase transport model. From experimental results, it is found that the dissolved organic carbon enhances the transport of OCPs in the soil columns. In the OCPs-only column, the concentration profiles of OCPs can be simulated well using a two-phase transport model with numerical method or analytical solution. In the OCPs-DOC column, the migrations of aldrin, DDT and its daughter compounds are faster than those in the OCPs-only column. The simulation with the three-phase model is more accurate than that with the two-phase model. In addition, significant decrease of the fluid pore velocities of the OCPs-DOC column was found. When DOC leachate is applied for remediation of soil or groundwater pollution, the decrease of mean pore velocities will be a crucial affecting factor.

Effect of landuse on the composition of throughflow water immediately above clayey B horizons in the Warren Catchment, South Australia

1993 ◽  
Vol 33 (2) ◽  
pp. 239 ◽  
Author(s):  
R Naidu ◽  
DR Williamson ◽  
RW Fitzpatrick ◽  
IO Hollingsworth
Keyword(s):  
Electrical Conductivity ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Organic Compounds ◽  
South Australia ◽  
Total Dissolved Solids ◽  
Rate Of Change ◽  
Native Woodland ◽  
Colloidal Matter ◽  
Dissolved Organic Compounds

The effect of landuse on composition of throughflow water immediately above the clayey B horizons in duplex soils (mostly natric and/or sodic) in the Mount Lofty Ranges, South Australia, was investigated using simple lysimeters. During July-November 1991, the pH of the first flow immediately after rainstorm under pines, native woodland, and pasture, respectively, was 5.7, 6.0, and 6.4. At each of the sites, average pH over 4 months during July-November was 5.8-5.9. Both the electrical conductivity (EC) and the amounts of total dissolved solids (TDS) were 2-3 times higher under pine than at other sites. The rate of change in EC with respect to TDS varied considerably among the sites, possibly due to the large differences in the concentration of dissolved organic compounds. Although the pH of water was >5.5, both aluminium and iron were recorded, especially under pine, where there were also high levels of dissolved organic compounds. High levels of suspended colloidal matter were recorded in the water flowing under pine, and these levels were related to dissolved organic carbon.

scholarly journals Hydrologically transported dissolved organic carbon influences soil respiration in a tropical rainforest

2016 ◽  
Author(s):  
W.-J. Zhou ◽  
H.-Z. Lu ◽  
L.-Q. Sha ◽  
Y.-P. Zhang ◽  
D. A. Schaefer ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Respiration ◽  
Dissolved Organic Carbon ◽  
Soil Temperature ◽  
Soil Water ◽  
Tropical Rainforest ◽  
Surface Soil ◽  
Hydrological Processes ◽  
Doc Flux ◽  
Litter Leachate

Abstract. To better understand the role of the dissolved organic carbon (DOC) transported by hydrological processes in soil respiration in tropical rainforests, we measured: (1) the DOC flux in rainfall, throughfall, litter leachate, and surface soil water (0–20 cm), (2) the seasonality of δ13CDOC in each hydrological process, and δ13C in leaves, litter, and surface soil, and (3) soil respiration in a tropical rainforest in Xishuangbanna, southwest China. The results showed: the surface soil intercepted 94.4 ± 1.2 % of the annual litter leachate DOC flux and is a sink for DOC. The throughfall and litter leachate DOC fluxes amounted to 6.81 % and 7.23 % of the net ecosystem exchange, respectively, indicating that the DOC flux through hydrological processes is a key component of the carbon budget, and may be a key link between hydrological processes and soil respiration in the tropical rainforest. The difference in δ13C among the soil, soil water (at 0–20 cm), throughfall, and litter leachate indicated that DOC is transformed in the surface soil. The variability in soil respiration is more dependent on the hydrologically transported DOC flux than on the soil water content (at 0–20 cm), and is more sensitive to the soil water DOC flux (at 0–20 cm) than to the soil temperature, which suggests that soil respiration is more sensitive to the DOC flux in hydrological processes, especially the soil water DOC flux, than to soil temperature or soil moisture.

Dissolved organic carbon from European beech logs: Patterns of input to and retention by surface soil

Ecoscience ◽  
2012 ◽  
Vol 19 (4) ◽  
pp. 364-373 ◽  
Author(s):  
Tiemo Kahl ◽  
Martina Mund ◽  
Jürgen Bauhus ◽  
Ernst-Detlef Schulze
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Surface Soil ◽  
European Beech

scholarly journals Hydrologically transported dissolved organic carbon influences soil respiration in a tropical rainforest

2016 ◽  
Vol 13 (19) ◽  
pp. 5487-5497 ◽  
Author(s):  
Wen-Jun Zhou ◽  
Hua-Zheng Lu ◽  
Yi-Ping Zhang ◽  
Li-Qing Sha ◽  
Douglas Allen Schaefer ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Respiration ◽  
Dissolved Organic Carbon ◽  
Soil Temperature ◽  
Soil Water ◽  
Tropical Rainforest ◽  
Surface Soil ◽  
Hydrological Processes ◽  
Doc Flux ◽  
Litter Leachate

Abstract. To better understand the effect of dissolved organic carbon (DOC) transported by hydrological processes (rainfall, throughfall, litter leachate, and surface soil water; 0–20 cm) on soil respiration in tropical rainforests, we detected the DOC flux in rainfall, throughfall, litter leachate, and surface soil water (0–20 cm), compared the seasonality of δ13CDOC in each hydrological process, and δ13C in leaves, litter, and surface soil, and analysed the throughfall, litter leachate, and surface soil water (0–20 cm) effect on soil respiration in a tropical rainforest in Xishuangbanna, south-west China. Results showed that the surface soil intercepted 94.4 ± 1.2 % of the annual litter leachate DOC flux and is a sink for DOC. The throughfall and litter leachate DOC fluxes amounted to 6.81 and 7.23 % of the net ecosystem exchange respectively, indicating that the DOC flux through hydrological processes is an important component of the carbon budget, and may be an important link between hydrological processes and soil respiration in a tropical rainforest. Even the variability in soil respiration is more dependent on the hydrologically transported water than DOC flux insignificantly, soil temperature, and soil-water content (at 0–20 cm). The difference in δ13C between the soil, soil water (at 0–20 cm), throughfall, and litter leachate indicated that DOC is transformed in the surface soil and decreased the sensitivity indices of soil respiration of DOC flux to water flux, which suggests that soil respiration is more sensitive to the DOC flux in hydrological processes, especially the soil-water DOC flux, than to soil temperature or soil moisture.

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