MANIPULATION OF BACTERIA, FUNGI AND PROTOZOA BY BIOCIDES IN LODGEPOLE PINE FOREST SOIL MICROCOSMS: EFFECTS ON ORGANISM INTERACTIONS AND NITROGEN MINERALIZATION

1986 ◽  
Vol 66 (2) ◽  
pp. 261-272 ◽  
Author(s):  
E. R. INGHAM ◽  
C. CAMBARDELLA ◽  
D. C. COLEMAN
Keyword(s):  
Forest Soil ◽  
N Mineralization ◽  
Lodgepole Pine ◽  
Mineral Soil ◽  
Pine Forest ◽  
Inorganic N ◽  
Bacterial Populations ◽  
Fungal Populations ◽  
Pine Forest Soil ◽  
Bacteria And Fungi

Biocides were applied singly and in combination to determine their effect on target and nontarget microorganisms in mineral soil from a lodgepole pine forest and to determine microbial interaction effects on N mineralization. Soil was sterilized and reinoculated with field populations of bacteria, fungi and protozoa. Streptomycin (a bactericide), fungizone (a saprophytic fungicide), chloroform (reduces protozoa and a portion of the bacteria and fungi), a combination of cygon (an acaricide), carbofuran (an insecticide-nematicide) and chloroform and a combination of streptomycin and fungizone were used. Reduction of bacteria produced the same decreases in N immobilization and increases in soil inorganic N in forest soil as observed previously in grassland soil. Further, reduction of fungi decreased N mineralization. Chloroform reduced protozoa to below detection limits, reduced bacterial populations 2- to 10-fold, but only reduced fungal populations by twofold. Despite reductions in both bacteria and fungi, NH+4-N increased similarly to streptomycin treatments where only bacteria were reduced. When fungal populations increased after a reduction in bacterial populations, inorganic N concentrations increased. However, when fungal populations were reduced, bacterial populations did not increase, suggesting that bacteria do not compete with fungi for substrates. Key words: Microbial ecology, N mineralization, streptomycin, amphotericin B, chloroform, pesticide effects, lodgepole pine soil

Layer of organic pine forest soil on top of chlorophenol-contaminated mineral soil enhances contaminant degradation

2012 ◽  
Vol 20 (3) ◽  
pp. 1737-1745 ◽  
Author(s):  
Aki Sinkkonen ◽  
Sari Kauppi ◽  
Suvi Simpanen ◽  
Anna-Lea Rantalainen ◽  
Rauni Strömmer ◽  
...  
Keyword(s):  
Forest Soil ◽  
Mineral Soil ◽  
Pine Forest ◽  
Contaminant Degradation ◽  
Pine Forest Soil

The effect of fire on nutrients in a pine forest soil

1987 ◽  
Vol 104 (2) ◽  
pp. 269-274 ◽  
Author(s):  
P. Kutiel ◽  
Z. Naveh
Keyword(s):  
Forest Soil ◽  
Pine Forest ◽  
Pine Forest Soil

Effects of potassium azide on soil microbial populations and soil enzymatic activities

1975 ◽  
Vol 21 (4) ◽  
pp. 565-570 ◽  
Author(s):  
W. D. Kelley ◽  
R. Rodriguez-Kabana
Keyword(s):  
Soil Enzyme ◽  
Soil Microflora ◽  
Microbial Populations ◽  
Bacterial Populations ◽  
Soil Microbial ◽  
Fungal Populations ◽  
Potassium Azide ◽  
Time Changes ◽  
Bacteria And Fungi ◽  
Microbial Numbers

Preplant applications of potassium azide (KN3) to pine nursery beds were evaluated for effect on the soil microflora and on soil enzyme activity where either plastic-sealing or water-sealing techniques were used. Two weeks after incorporation of azide (0–224 kg/ha), soil samplings revealed reduced populations of bacteria and fungi and a corresponding decline in invertase and amylase activities. These effects were proportionate to the amount of azide used and were more pronounced in plastic-sealed plots. Phosphatase activity was little affected. Five weeks after azide application, bacterial populations were higher in treated plots than in controls. Greater numbers of bacteria were recorded from plastic-sealed plots and highest populations coincided with plots receiving the highest rates of azide, regardless of the sealing technique. Fungal populations at this sampling were generally less in treated plots than in the controls, but were higher under plastic seal. At this time, changes in invertase and amylase activities did not correspond to increased microbial numbers. Sixteen weeks after applications of KN3, bacterial populations in treated plots did not differ significantly from controls, but remained higher in plastic-sealed than water-sealed plots. Fungal populations under plastic seal had changed little and remained significantly lower in treated water-sealed plots than in controls. The earlier recorded reduction in invertase and amylase activities was still evident at the final sampling.

scholarly journals Presence and distribution of insect-associated and entomopathogenic fungi in a temperate pine forest soil: An integrated approach

2019 ◽  
Vol 123 (12) ◽  
pp. 864-874 ◽  
Author(s):  
Noland R. Deaver ◽  
Cedar Hesse ◽  
Cheryl R. Kuske ◽  
Andrea Porras-Alfaro
Keyword(s):  
Forest Soil ◽  
Entomopathogenic Fungi ◽  
Integrated Approach ◽  
Pine Forest ◽  
Pine Forest Soil

Micromonospora maoerensis sp. nov., isolated from a Chinese pine forest soil

2013 ◽  
Vol 105 (3) ◽  
pp. 451-459 ◽  
Author(s):  
Chuang Li ◽  
Chongxi Liu ◽  
Junwei Zhao ◽  
Yuejing Zhang ◽  
Ruixia Gao ◽  
...  
Keyword(s):  
Forest Soil ◽  
Pine Forest ◽  
Chinese Pine ◽  
Pine Forest Soil ◽  
Chinese Pine Forest

Variation with slope aspect in effects of temperature on nitrogen mineralization and nitrification in mineral soil of mixed hardwood forests

2015 ◽  
Vol 45 (7) ◽  
pp. 958-962 ◽  
Author(s):  
Frank S. Gilliam ◽  
Julia E. Galloway ◽  
Jacob S. Sarmiento
Keyword(s):  
N Mineralization ◽  
Incubation Temperature ◽  
Global Climate ◽  
Mineral Soil ◽  
Slope Aspect ◽  
Net N Mineralization ◽  
Inorganic N ◽  
N Dynamics ◽  
Net Nitrification ◽  
Effects Of Temperature

This study examined the effects of temperature on soil nitrogen (N) dynamics and variation with slope aspect (northeast (NE) versus southwest (SW)) at two forested sites in West Virginia — Beech Fork Lake (BFL) and Fernow Experimental Forest (FEF) — with similar soil and overstory characteristics but with different latitudes and elevations. Previous work on mineral soil from both sites had shown sharp differences in microbial communities between SW slopes and NE slopes. Mineral soil was sampled from three and eight plots per aspect at FEF and BFL, respectively. Inorganic N was extracted from samples, which were then divided into polyethylene bags for 7-day incubations at 4 °C, 15 °C, 25 °C, and 35 °C. Following incubation, soils were extracted and analyzed for inorganic N. Net N mineralization varied significantly between aspects and temperatures but did not vary between sites; net nitrification varied significantly between aspects, temperatures, and sites. Net N mineralization increased with incubation temperature at all aspects and sites. Net nitrification rates increased with incubation temperature for BFL soils; however, maximum net nitrification rates occurred at 20–25 °C for FEF soils. Net nitrification was essentially undetectable for SW soils at either site. Results underline the complexities of the N cycle in temperate forest ecosystems, representing challenges in predicting alterations in soil N dynamics under conditions of global climate change.

scholarly journals Drivers of Plot-Scale Variability of CH4 Consumption in a Well-Aerated Pine Forest Soil

Forests ◽  
2017 ◽  
Vol 8 (6) ◽  
pp. 193 ◽  
Author(s):  
Martin Maier ◽  
Sinikka Paulus ◽  
Clara Nicolai ◽  
Kenton Stutz ◽  
Philipp Nauer
Keyword(s):  
Forest Soil ◽  
Pine Forest ◽  
Pine Forest Soil
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