Journal of Arid Land, Journal Year: 2023, Volume and Issue: 15(8), P. 887 - 900
Published: Aug. 1, 2023
Abstract In grassland ecosystems, the aerodynamic roughness ( Z 0 ) and frictional wind speed u *) contribute to impedance of canopy. Thus, they are often used in studies erosion evapotranspiration. However, effect grazing measures on canopy has received less analysis. this study, we monitored speeds at multiple heights grazed grazing-prohibited grasslands for 1 month 2021, determined transit 2.0 m height by comparing differences same both grasslands, divided these intervals m/s analyze relationship among , *, within The results showed that dividing into a positive logarithmic fit profile. After intervals, 0.1 V gradually decreased with increase exhibiting three distinct stages: sharp change zone, steady flat zone; while overall trend * increased first then . Dividing improved fitting between changed their functions grasslands. According computational fluid dynamic results, found number tall-stature plants more significant windproof capacity than height. study better understanding vegetation environments.
Language: Английский
Citations
5
Ambiente e Agua - An Interdisciplinary Journal of Applied Science, Journal Year: 2024, Volume and Issue: 19, P. 1 - 21
Published: March 5, 2024
This work evaluates the impact of different agricultural systems on humic fractions organic matter (SOM) and soil aggregation in a medium-textured subtropical region Brazil. Three managed areas reference area were evaluated: permanent pasture (PP), no-till (NT), no-till+Brachiaria (NT+B) native forest (NF). Deformed samples collected layers 0-0.05; 0.05-0.10; 0.10-0.20 0.20-0.40 m, unformed 0-0.05 0.05-0.10 m. After collection, total carbon (TOC) analysis, chemical fractioning SOM aggregate stability analysis performed. The PP presented highest TOC C-FA contents first three evaluated. In m layer, C-HUM NT+B 1.9 times higher than NT area, they 6.6 higher. obtained best structural indicators, especially WMD, GMD % macroaggregates. two using direct seeding percentage macroaggregates 37.28% superficial layer. management provided increases levels and, consequently, substances, besides formation more stable aggregates. system showed promise increasing at depth, even with short implementation period. increase substances by grasses contributes to aggregates improvement quality soils. Keywords: stability, fractions, climate change, substances.
Language: Английский
Citations
1
CATENA, Journal Year: 2024, Volume and Issue: 240, P. 108002 - 108002
Published: March 29, 2024
Language: Английский
Citations
1
Frontiers in Sustainable Food Systems, Journal Year: 2021, Volume and Issue: 5
Published: Dec. 1, 2021
Highly digestible forages are associated with an in vitro low-methane (CH 4 ) rumen fermentation profile and thus the possibility of reducing CH emissions from forage-based systems. We aimed to assess ruminal profile, including production, top stratum Kikuyu grass ( Cenchrus clandestinus - Hochst. ex Chiov harvested at different sward heights (10, 15, 20, 25, 30 cm). Herbage samples (incubating substrate) were analyzed for their chemical composition, organic matter digestibility (IVOMD), morphological components. In incubations performed under a randomized complete block design four independent runs each treatment. Gas production (GP), dry (IVDMD), total volatile fatty acid (VFA) concentration, acetate, propionate, butyrate proportions measured following 24 48 h incubation. had similar contents matter, neutral detergent fiber, crude protein all treatments. However, higher fiber (ADF) content taller than smaller tendency metabolizable energy (ME) IVOMD decrease as height increased found. Similarly, stem + sheath mass tended increase increasing height. Amongst nutrients, ME r = −0.65) IVDMD −0.64) negatively correlated p < 0.001) ADF was positively 0.73, 0.001). Both GP related both incubation times. Sward below cm display VFAs high propionate low trend toward lower methane per unit IVDMD. These findings important aid decision-making on optimal manage animal grazing opportunity reduce production.
Language: Английский
Citations
8
Agronomy, Journal Year: 2023, Volume and Issue: 13(6), P. 1574 - 1574
Published: June 9, 2023
Long-term grazing leads to soil degradation in Inner Mongolia grassland. Based on the Hulunbeier meadow steppe, variation characteristics of nitrogen content and storage layers between 0–40 cm, under six different intensities, response vegetation other physical chemical properties were studied. The main results as follows: (1) Moderate increased total (TN), soluble (STN) microbial biomass (MBN) contents, while heavy decreased MBN content. In year with more rain, nitrate (NO3−-N) storage, less rain ammonium (NH4+-N) (2) proportion cm components showed an upward trend opposite years rainfall increase intensity. Soil organic (SON) NO3−-N storages rainy years. (3) component contents correlated plant growth status, moisture (SM) bulk density (SBD), significantly negatively temperature (ST) pH (p < 0.05). affected by grazing, soil, vegetation, meteorological environmental factors. was conducive improvement capacity healthy development
Language: Английский
Citations
3
Agronomy, Journal Year: 2023, Volume and Issue: 13(3), P. 850 - 850
Published: March 14, 2023
Pastures are of central importance in food production and provide multiple ecosystem services. The objective this paper was to determine whether the intensification pasture-based animal systems, through practices such as fertilization improved pasture species, has a higher capacity short-term (five years) sequester carbon soil compared (1) natural grassland without anthropogenic interactions, (2) fertilized overseeded with exotic (3) annual pastures frequent disturbance. study assessed organic stock (OCS), total (TOC), particle size, porosity, density at different strata, well root system forage production. Forage dry matter (DM) varied significantly means ranging from 6615 13,000 kg ha–1 year–1 for (NG) permanent (PP), respectively. Improved (ING) NG presented diameter than PP (AP). systems influenced porosity density, ING showing lower densities porosities. OCS (0–100 cm) similar between (270 Mg ha–1), (255 (274 AP (256 ha–1). Over period five years, did not have significant impact on soils Brazilian subtropical highland.
Language: Английский
Citations
2
Grassland Research, Journal Year: 2023, Volume and Issue: 2(4), P. 279 - 288
Published: Nov. 2, 2023
Abstract Background Selective grazing creates stable patches of contrasting sward height, thereby providing different growth conditions for the grass above and below ground potentially affecting soil organic carbon (SOC) stocks. We hypothesized that presence leads to greater spatial variability in belowground biomass (BGB) SOC stocks than occurs between pastures managed under stocking intensities. Methods A long‐term experiment consisting three intensities was used this study. studied BGB, SOC, total nitrogen (N tot ) 0–15 cm depth. Shannon diversity plant species, bulk density, phosphorus, potassium, magnesium contents were considered. Results There no significant effects patch or intensity on N Short had a tall ( p < 0.05) plant‐available nutrients correlated positively with height 0.05). Conclusions conclude from current results previous studies higher species lower nutrient short‐patch areas together light competition tall‐patch might balance each other out respect BGB
Language: Английский
Citations
2
Authorea (Authorea), Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 1, 2024
Preferential flow plays an important role in the ecosystem. In order to understand influence of enclosure on root-soil structure preferential region, and difference between region matrix region. this paper, soil Caragana korshinskii shrub under or grazing measures Yanchi, Ningxia, China was selected as research object. The geometric distribution topological indexes (aggregates, macropores roots) were obtained by CT scanning three-dimensional image processing. results showed that enclosed natural grassland had highest staining area ratio (40.38%) depth (271 mm). aggregates artificial C. more uniform. Enclosure significantly reduced number density volume aggregates, roots (p<0.05). Compared with increased (p<0.05), average equivalent diameter decreased negatively affects macropores. Aggregates directly promote process, indirectly affect process through aggregates. Clarifying relationship enclosure, can provide a basis for vegetation restoration management arid semi-arid areas.
Language: Английский
Citations
0
Soil and Tillage Research, Journal Year: 2024, Volume and Issue: 247, P. 106344 - 106344
Published: Nov. 22, 2024
Language: Английский
Citations
0
PLoS ONE, Journal Year: 2022, Volume and Issue: 17(7), P. e0269716 - e0269716
Published: July 8, 2022
Understanding the grazing process and animal response to sward structures (e.g., height) is key setting targets for efficient management. We hypothesized that short-term intake rate (STIR) of dry matter (DM) digestible organic (OM) by dairy heifers maximized with Kikuyu grass ( Cenchrus clandestinus— Hochst. ex Chiov.) intermediate heights. The treatments consisted five pre-grazing heights (10, 15, 20, 25, 30 cm) randomly assigned two ten paddocks. experimental design included measurements each paddock at different periods times day. Three Holstein (440 ± 42 kg body weight) were used determine STIR, which was estimated using double-weighing technique correction insensible weight losses. bite mass (BM), (BR), structural characteristics, nutritional value herbage samples assessed. data analyzed mixed models a factorial arrangement heights, day, evaluation periods. height both STIRs approximately 20 cm. STIR DM 30% 15% lower than maximum in shortest tallest swards tested, respectively. In shorter cm, because BM decreased height, whereas those greater explained decrease bulk density volume. top stratum composed mainly highly leaf blades similar nutrient content across heights; therefore OM also Hence, optimal should be managed cm under rotational stocking systems maximize heifers.
Language: Английский
Citations
1