Oats hay supplementation to yak grazing alpine meadow improves carbon return to the soil of grassland ecosystem on the Qinghai-Tibet Plateau, China

Yang, Chengjian; Hou, Fujiang; Sun, Yi; Yuan, Hao; Liu, Y.; Zhang, Y.; Chang, Shenghua

doi:10.1016/j.gecco.2020.e01158

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…Grazing intensity affects grassland ecosystem stability and livestock productivity, and is critical for grazing management (Mipam et al, 2016;Yang et al, 2020). Actual livestock carrying capacity is approximately 1.6 times the theoretical capacity, and 80.93% of counties have overloaded grazing on the Tibetan Plateau (Fu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Actual livestock carrying capacity is approximately 1.6 times the theoretical capacity, and 80.93% of counties have overloaded grazing on the Tibetan Plateau (Fu et al, 2021). Soil organic matter is the dominant source of grassland nutrients; 95% and 50% of soil total nitrogen and phosphorus, respectively, is derived from organic matter mineralisation (Yang et al, 2020). The disappearance of high-quality pastures is mainly caused by the depletion of soil nutrients due to overgrazing (Gebregergs et al, 2019;Li et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Grazing disturbance significantly decreased soil organic carbon contents of alpine grasslands on the Tibetan Plateau

Yang

Zhang²,

et al. 2023

Front. Environ. Sci.

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Ecological security barriers on the Tibetan Plateau are threatened by climate change and human activities, such as grassland degradation and reduction of carbon fixation capacity. Understanding the influence of grazing on soil organic carbon (SOC) content and its regulating factors is important for improving the ecological barrier function of alpine grasslands. In this meta-analysis, we analysed the effects of grazing on SOC. The results indicate that grazing disturbance significantly reduced the SOC content by 13.93%, with an effect size of −0.15 ± 0.04 (p < 0.001). The effect of light grazing was not significant. The reduction range gradually increased with increasing grazing intensity. The effect of grazing activity on SOC content was driven mainly by pH and total nitrogen through a structural equation model. Future nitrogen deposition scenarios would significantly increase alpine meadow SOC on the Tibetan Plateau.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grazing disturbance significantly decreased soil organic carbon contents of alpine grasslands on the Tibetan Plateau

Yang

Zhang²,

et al. 2023

Front. Environ. Sci.

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“…Yak is an important ruminant animal in the plateau area of China, accounting for >90% of worldwide yak production ( 11 , 12 ). When a traditional grazing pattern is employed, yak weight varies seasonally, which affects animal productivity and the income of herdsmen ( 13 , 14 ). Nowadays, two modes are common; two-stage feeding (grazing in the warm season, shelter feeding in the cold season) and shelter fattening ( 12 , 15 ).…”

Section: Introductionmentioning

confidence: 99%

Dynamic changes in the yak rumen eukaryotic community and metabolome characteristics in response to feed type

Cui

Liu

et al. 2022

Front. Vet. Sci.

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With diversification of yak breeding, it is important to understand the effects of feed type on the rumen, especially microbiota and metabolites. Due to the unique characteristics of yak, research on rumen microbes and metabolites is limited. In this study, the effects of two diet types on rumen eukaryotic microflora and metabolites were evaluated using the Illumina MiSeq platform and liquid chromatography-mass spectrometry (LC-MS). All identified protozoa belonged to Trichostomatia. At the genus level, the relative abundance of Metadinium and Eudiplodinium were significantly (p < 0.05) higher in the roughage group than that of concentrate group, while the concentrate group harbored more Isotricha. Ascomycota, Basidiomycota, and Neocallimastigomycota were the main fungal phyla, and the Wallemia, Chordomyces, Chrysosporium, Cladosporium, Scopulariopsis, and Acremonium genera were significantly (p < 0.05) more abundant in the roughage group than the concentrate group, while the concentrate group harbored more Aspergillus, Neocallimastix, Thermoascus, and Cystofilobasidium (p < 0.05). Metabolomics analysis showed that feed type significantly affected the metabolites of rumen protein digestion and absorption (L-proline, L-phenylalanine, L-tryosine, L-leucine, L-tryptophan, and β-alanine), purine metabolism (hypoxanthine, xanthine, guanine, guanosine, adenosine, and adenine), and other metabolic pathway. Correlation analysis revealed extensive associations between differential microorganisms and important metabolites. The results provide a basis for comprehensively understanding the effects of feed types on rumen microorganisms and metabolites of yaks. The findings also provide a reference and new directions for future research.

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“…They number over 50 million animals and have vital importance to local livelihoods. They provide milk and meat for food and income for the Tibetan people on the plateau (Yang et al, 2020). In addition, Tibetan sheep are well adapted to the plateau's harsh conditions; thus, they utilize nitrogen (N) more efficiently than other sheep breeds, such as fine-wool sheep (Zhou et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Nutrient utilization of native herbage and oat forage as feed for Tibetan sheep (Ovis aries)

Abdelraheem

Guo

et al. 2022

Grassland Science

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Satisfying the animals feed demand from the forage supply by grasslands remains a major challenge in the grassland–livestock ecosystem. To provide an alternative forage sources, this study conducted two feeding trials in the summer of 2015 and 2016 to compare the nutritive value, digestibility and nutrients utilization of native pasture (NH) and oat forage (OT) fed to Tibetan sheep (Ovis aries). Twelve Tibetan sheep with a mean body weight of 39.11 ± 3.66 kg in 2015 and 27.97 ± 2.69 kg in 2016 were use in this study. The experiment was 2 (year: 2015 and 2016) by 2 (forage: NH and OT) factorial. Data on proximate analysis, fiber fraction and nutrients digestibility were collected and analyzed using general linear model. However, the crude protein (CP) and water‐soluble carbohydrates contents in OT were higher (P < .001) than those in NH by 7.81–8.93% and 46.40–47.05%, respectively. In contrast, the neutral detergent fiber (NDF) and acid detergent fiber contents were higher (P < .001) in NH by 14.28–15.78% and 15.62–18.00%, respectively. The dry matter digestibility coefficient in OT (0.82 in 2015 and 0.79 in 2016) was significantly higher than that in NH (0.68 in both years). In addition, the OT diet had higher (P < .001) organic matter, NDF and CP digestibilities. Animals fed OT retained significantly more nitrogen (2.66 g/day in 2015 and 1.93 g/day in 2016) than those fed NH (0.96 g/day in 2015 and 0.42 g/day in 2016). The digestible energy and metabolizable energy were higher (P < .001) in OT than in NH. Our data indicated that Tibetan sheep urinary N excretion increased by 0.726 g with increase of 1 g in the nitrogen intake. Conclusively, the OT had higher nutritive value than NH and could therefore use to satisfy livestock demand and reduce the grazing pressure on grasslands.

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Oats hay supplementation to yak grazing alpine meadow improves carbon return to the soil of grassland ecosystem on the Qinghai-Tibet Plateau, China

Cited by 7 publications

References 33 publications

Grazing disturbance significantly decreased soil organic carbon contents of alpine grasslands on the Tibetan Plateau

Grazing disturbance significantly decreased soil organic carbon contents of alpine grasslands on the Tibetan Plateau

Dynamic changes in the yak rumen eukaryotic community and metabolome characteristics in response to feed type

Nutrient utilization of native herbage and oat forage as feed for Tibetan sheep (Ovis aries)

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