Bulk Density Sampler for Deep Soil Profiles

1975 ◽  
Vol 39 (6) ◽  
pp. 1220-1223
Author(s):  
K. M. Holtzclaw ◽  
J. M. Rible ◽  
P. F. Pratt
Keyword(s):  
1972 ◽  
Vol 1 (1) ◽  
pp. 97-101 ◽  
Author(s):  
P. F. Pratt ◽  
W. W. Jones ◽  
V. E. Hunsaker

1986 ◽  
Vol 66 (4) ◽  
pp. 737-742
Author(s):  
J. A. MILLETTE ◽  
R. S. BROUGHTON

Monolith column construction and sampling procedures were described for organic soil profiles and used to measure the variation with depth of saturated hydraulic conductivity, bulk density and fiber content. The top 0.30 m of the organic soil was more permeable, had a greater bulk density and had a greater fiber content than the soil layer between 0.60 and 0.90 m from the soil surface. These columns can be used for correlations studies between physical properties and studies of the dynamic nature of the physical properties of organic soils. Key words: Saturated hydraulic conductivity, bulk density, fiber content, organic soil, monolith columns


Author(s):  
Diana Calderon ◽  
Fernando Lazares ◽  
Zenon Aguilar ◽  
Toru Sekiguchi ◽  
Shoichi Nakai
Keyword(s):  

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Malode K. R ◽  
Singh Akansha ◽  
Sharma C. K

A study was conducted in arid and semi-arid zones of Marathwada region of Maharashtra during 2011-12. Six soil profiles on different topographic condition were chosen at Nanded, Latur, Osmanabad and Beed districts of Marathwada region. These profiles were examined for soil site properties such as climate, depth, texture, structure and drainage. Physico-chemical properties such as pH, EC, Organic carbon, CEC, CaCO3 content, available micro nutrient contents, bulk density, hydraulic conductivity, sand, silt and clay were also studied,. Morphological analysis showed that surface structure was weak, and sub surface structure was sub angular to angular blocky. Soil color showed dark grayish brown to very dark gray in color. Drainage was moderately well in all soils except P4, P5 and P6, which were showed imperfect drained. Soils were clayey in texture the clay per cent ranged from 50.1 % to 62.1 %, sand ranged from 9.7 % to 21.6 % and silt varied from 25.1% to 32.9 %. The bulk density range from 1.27 to 1.56 Mg m-3. Hydraulic conductivity ranged from 0.1. to 5.3 cm hr-1. The pH ranges showed that soils were moderately to strongly alkaline in reaction. Organic carbon ranged from 1.95 to 10.04 g kg-1, calcium carbonate ranged from 2.8 to 19.0 % and CEC ranged from 38.2 to 78.2 cmol p(+) kg-1. Based on field morphology and laboratory characterizations, the soil of the study area classified to Vertisols of great group Haplusterts. The all soil profiles were classified as Typic Haplusterts at great group level except pedon P6 is Vertic Haplusterts. Soil profile when correlated with yield it was concluded that pedon P5 Typic Haplusterts belonging to order Vertisols were best soils for soybean growing that order.


Author(s):  
M.E. Wedderburn ◽  
W.J. Pengelly ◽  
M.A. Tucker

A novel, simple technique for screening plants using simulated hill soil protiles is described. Three large bins were constructed and a soil profile built up in each using layers of hill subsoil and topsoil compacted to field bulk density. 2100 ryegrass plants were transplanted at 5 cm spacing in each ot the three bins. This technique has enabled controlled manipulation of soil fertility, development of simulated pure ward conditions and identification of individual plants. It has been used successfully to screen the hill ryegrass collection held at Whatawhata Research Centre for response to nitrogen and drought. Keywords: hill soils, ryegrass. nitrogen, drought, plant screening, soil profiles


2020 ◽  
Author(s):  
Rui Xu ◽  
Xiaoxu Sun ◽  
Feng Han ◽  
Enzong Xiao ◽  
Baoqin Li ◽  
...  

Abstract BackgroundSoil microbes play critical roles in the biogeochemical cycling of antimony (Sb) and arsenic (As), and the effects of Sb and As contamination on soil microbiota have been well documented in surface soils (< 0.2 m). However, their effects in deep soils remain poorly understood. This study determined the depth-resolved effects of Sb and As contamination on the microbial adaptation throughout soil profiles (0–2 m) and compared contaminated soil samples to uncontaminated samples.Methods16S rRNA amplicon sequencing and shotgun metagenomic sequencing were employed to investigate the microbial community and their metabolism traits in soil profiles. Co-occurrence network analysis was used to present the pairwise interactions of microbes.ResultsAs soil depth increased, Acidobacteria (18.8%–44.7% from top to bottom, hereafter), Chloroflexi (8.7%–42.4%), Proteobacteria (11.4%–27.1%), and Thaumarchaeota (0.49%–20.17%) were the most variable phyla from surface to deep soil. A set of co-occurrence networks revealed an obvious changing pattern of microbial interactions as soil depth increased. The networks were loosely connected in the heavily contaminated surface soil but gradually recovered and were well connected in the less contaminated deep soil. Results suggested that individual species became more connected with other patterns to perform syntrophic functions in the less contaminated soil depth. Shotgun metagenomic sequencing results indicated that microbial metabolic potential also changed with soil depth. Genes encoding C metabolism pathways were negatively correlated with Sb and As concentrations. A set of arsenic-related genes was enriched by the high Sb and As contamination but reduced with soil depth. ConclusionsSoil depth-resolved characteristics are often many meters deep and their microbial diversity and community structures obviously change along their vertical soil profiles due to different nutrient contents and biomasses. The significance of this study is that it further reveals how the microbial communities and microbial physiological traits respond to different soil profiles contaminated by high concentrations of Sb and As.


2019 ◽  
Vol 39 (18) ◽  
Author(s):  
冯棋 FENG Qi ◽  
杨磊 YANG Lei ◽  
王晶 WANG Jing ◽  
石学圆 SHI Xueyuan ◽  
汪亚峰 WANG Yafeng

2020 ◽  
Vol 96 (11) ◽  
Author(s):  
Rui Xu ◽  
Xiaoxu Sun ◽  
Hanzhi Lin ◽  
Feng Han ◽  
Enzong Xiao ◽  
...  

ABSTRACT Antimony mining has resulted in considerable pollution to the soil environment. Although studies on antinomy contamination have been conducted, its effects on vertical soil profiles and depth-resolved microbial communities remain unknown. The current study selected three vertical soil profiles (0–2 m) from the world's largest antimony mining area to characterize the depth-resolved soil microbiota and investigate the effects of mining contamination on microbial adaptation. Results demonstrated that contaminated soil profiles showed distinct depth-resolved effects when compared to uncontaminated soil profiles. As soil depth increased, the concentrations of antimony and arsenic gradually declined in the contaminated soil profiles. Acidobacteria, Chloroflexi, Proteobacteria and Thaumarchaeota were the most variable phyla from surface to deep soil. The co-occurrence networks were loosely connected in surface soil, but obviously recovered and were well-connected in deep soil. The metagenomic results indicated that microbial metabolic potential also changed with soil depth. Genes encoding C metabolism pathways were negatively correlated with antimony and arsenic concentrations. Abundances of arsenic-related genes were enriched by severe contamination, but reduced with soil depth. Overall, soil depth-resolved characteristics are often many meters deep and such effects affected the indigenous microbial communities, as well as their metabolic potential due to different contaminants along vertical depths.


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