scholarly journals Seasonal Wetness, Soil Organic Carbon, and Fire Influence Soil Hydrological Properties and Water Repellency in a Sagebrush‐Steppe Ecosystem

2018 ◽  
Vol 54 (10) ◽  
pp. 8514-8527
Author(s):  
David G. Chandler ◽  
Yang Cheng ◽  
Mark S. Seyfried ◽  
Matthew D. Madsen ◽  
Chris E. Johnson ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Water Repellency ◽  
Sagebrush Steppe ◽  
Steppe Ecosystem

Conservation tillage positively influences soil organic carbon through earthworm excrement physical structure stability in a Chinese Mollisoil

2020 ◽  
Author(s):  
Xuewen Chen ◽  
Aizhen Liang ◽  
Donghui Wu ◽  
Shuxia Jia ◽  
Yan Zhang
Keyword(s):  
Tensile Strength ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Surface Area ◽  
Conservation Tillage ◽  
Water Repellency ◽  
Physical Structure ◽  
Structure Stability ◽  
Pore Surface ◽  
Pore Surface Area

<p>Identifying the relationship between earthworm activity and soil organic carbon is vital for both planning and performing farming operations. Numerous studies have emphasized that earthworms affect soil organic carbon greatly. However, the extent of this effect is still somewhat vague, and very little is known, not to mention the role of earthworm excrement. The objective for this study is to determine the effect of earthworm excrement on soil organic carbon following different tillage practices based on physical structure stability parameters. Both no tillage (NT) and ridge tillage (RT) led to significant total pore surface area, permeability, fluid conductivity, water resistance index and tensile strength increment than moldboard plow (MP) (p<0.05), whereas water repellency significant decrement (p<0.05). Similar to soil organic carbon, NT and RT significantly increase organic carbon in earthworm excrement than MP (p<0.05). A significant positive correlation (p<0.05) was found between organic carbon in earthworm excrement and total pore surface area, water repellency, tensile strength, respectively. This finding demonstrates that conservation tillage increase organic carbon in earthworm excrement through physical structure stability namely aggregation effect of earthworm excrement on soil water movement and gas diffusion, potentially important for the soil organic carbon increment.</p>

Contributions of soil organic carbon to soil water repellency persistence: Characterization and modelling

Geoderma ◽  
2021 ◽  
Vol 401 ◽  
pp. 115312
Author(s):  
Zihuan Fu ◽  
Wei Hu ◽  
Michael H. Beare ◽  
Karin Müller ◽  
Dirk Wallace ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Water ◽  
Water Repellency ◽  
Soil Water Repellency

Long-term cropping and fertilization influences soil organic carbon, soil water repellency, and soil hydrophobicity

2020 ◽  
Vol 100 (3) ◽  
pp. 234-244
Author(s):  
J.J. Miller ◽  
M.L. Owen ◽  
X.M. Yang ◽  
C.F. Drury ◽  
W.D. Reynolds ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Water ◽  
Perennial Grass ◽  
Water Repellency ◽  
Kentucky Bluegrass ◽  
Soil Water Repellency ◽  
Loam Soil ◽  
Soil Hydrophobicity

Long-term (58 yr) cropping and fertilization effects on soil water repellency were determined for a clay loam soil in southwestern Ontario, Canada by measuring soil organic carbon (SOC), soil water repellency index (RI), and soil hydrophobicity (SH). The 12 treatments (non-replicated) included fertilized and non-fertilized legume-based crop rotation (ROT) with four phases (corn–oat–alfalfa–alfalfa), continuous corn (CC), and continuous Kentucky bluegrass (KBG). We hypothesized that SOC, RI, and SH would be greater for each phase of the ROT versus CC, KBG versus CC and ROT, and fertilized versus non-fertilized treatments. Surface (0–10 cm) soil samples were collected in the spring of 2017. Laboratory measurements were conducted to determine SOC, RI (ratio of soil sorptivity to ethanol and water), and SH (ratio of hydrophobic CH– to hydrophilic CO– functional groups). Mean SOC and SH were greater (P ≤ 0.05) for each phase of the ROT versus CC (33% to 2.4 times), KBG versus CC (3.2–6 times) and each phase of ROT (2.2–2.8 times), and fertilized versus non-fertilized rotation oats and KBG (15%–30%). Mean RI was greater for KBG versus CC (4.8 times) and KBG versus each phase of the ROT (3.0–5.5 times) under fertilization only, greater for fertilized versus non-fertilized KBG (6.8 times), but similar for each phase of ROT versus CC. In general, legume-based rotations, perennial grass, and fertilizer enhanced SOC and SH, and to a lesser extent soil RI.

Influence of continuous application of feedlot manure and legacy treatments on soil organic carbon, soil hydrophobicity, and soil water repellency

2021 ◽  
pp. 1-13
Author(s):  
J.J. Miller ◽  
M.L. Owen ◽  
X. Hao ◽  
X.M. Yang ◽  
C.F. Drury ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Water ◽  
Agricultural Soils ◽  
Water Repellency ◽  
Exponential Model ◽  
Application Rate ◽  
Soil Water Repellency ◽  
Continuous Application ◽  
Soil Hydrophobicity

Continuous or discontinued manure applications to agricultural soils may impact soil organic carbon (SOC) and water balances because of manure carbon inputs and the potential for manure-induced soil hydrophobicity (SH) and soil water repellency (SWR). A laboratory study was conducted using a long-term (44 yr) field experiment on a clay loam soil to determine the effect of application rate of feedlot manure under dryland (0, 30, 60, and 120 Mg·ha−1 wet weight) and irrigation (0, 60, 120, and 180 Mg·ha−1) on SOC, SH, and SWR. In addition, we compared the effect of 44 yr of continuous annual manure applications (C44) to legacy treatments which had discontinued applications for 14 (D14) or 30 yr (D30). Laboratory measurements were conducted on air-dried and sieved (<2 mm) soil to determine SOC, SH using Fourier transform infrared spectroscopy, and SWR using the repellency index (RI) method. Mean RI values for all treatments ranged from 2.20 to 13.0, indicating subcritical (RI > 1.95) SWR. Manure application rate had a significant (P ≤ 0.05) and positive effect on SOC and SH, and both followed an exponential model. In contrast, RI had a negative response to the application rate under dryland and had no response under irrigation. Overall, positive responses of SOC and SH to application rate supported our hypothesis, but it was not supported for RI. The hypothesis of greater SOC, SH, and RI for continuous versus discontinued treatments was also supported for SOC and SH but not for RI.

Shrub Size Modulates Resource Heterogeneity in a Sagebrush-Steppe Ecosystem

2020 ◽  
Vol 80 (1) ◽  
pp. 28
Author(s):  
Lin Liu ◽  
Kari E. Veblen ◽  
Thomas A. Monaco
Keyword(s):  
Sagebrush Steppe ◽  
Resource Heterogeneity ◽  
Steppe Ecosystem
Sign in / Sign up

Export Citation Format

Share Document