Effects of stocking rate on the interannual patterns of ecosystem biomass and soil nitrogen mineralization in a meadow steppe of northeast China

Zhang, Yu; Zhao, Jinling; Xin, Xiaoping; Wang, Miao; Pan, Fengjuan; Yan, Ruirui; Li, Linghao

doi:10.1007/s11104-021-04901-4

Cited by 19 publications

(16 citation statements)

References 57 publications

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“…Thirdly, altered soil moisture by grazing may be another mechanism that regulates CH 4 uptake. Our longterm data showed that soil moisture was higher in most cases under various stocking rates of grazing than the no grazing (G0.00) treatment, although no linearly increasing trend of soil moisture with increasing stocking rate was found (Zhang et al 2021). Stocking-resultant increases in soil moisture were likely related in part to the corresponding decreases in ANPP which consumed less soil water.…”

Section: Discussionmentioning

confidence: 59%

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Effects of Livestock Grazing on Interannual Variation of Soil Methane Uptake in an Inner Mongolian Meadow Steppe

Yan¹,

Zhang²,

Chen³

et al. 2021

Preprint

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Background and aims. This study aimed at identifying the effects of livestock grazing on interannual variation in soil CH4 uptake and underlying mechanisms in a meadow steppe ecosystem. Methods. A multi-year grazing experiment subject to six stocking rates was conducted to quantify CH4 fluxes as well as the changes in driving factors: vegetation traits, soil physicochemical properties and climatic parameters. The closed static chamber technique and a gas chromatograph were used to measure methane fluxes. Multivariate regression analysis was performed to explore empirical relationships. Results. With increasing stocking rate, the multi-year mean CH4 uptake rate decreased in a sigmoid curve-shaped manner, with the threshold point appearing in the light grazing treatment. The interannual changes in soil CH4 uptake were highly dependent on stocking rate, with increasing, leveling and decreasing trends detected with increasing grazing intensity. Major factors affecting CH4 fluxes included vegetation traits, soil moisture, and soil nitrogen content, with the soil NH4+-N content assuming the most important role. However, predominant factors regulating interannual changes in CH4 uptake were rainfall, belowground biomass, and soil nitrogen regime. Conclusions. The steppe ecosystem acted as a CH4 sink, irrespective of stocking rate and year. However, light grazing can be the threshold grazing intensity in terms of both the CH4 uptake potential and primary production in this steppe ecosystem. Our findings have important implications for further understanding magnitudes and regulations of CH4 uptake in grassland soils worldwide.

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Section: Discussionmentioning

confidence: 59%

“…6). Our long-term data showed that the multi-year mean soil NH 4 + -N content had increased by all grazing treatments, particularly at the highest stocking rate (Zhang et al 2021). For some years, one-to two-fold increases in soil NH 4 + -N content were observed under the highest stocking rate compared to the reference unit (G0.00).…”

Section: Discussionmentioning

confidence: 65%

Effects of Livestock Grazing on Interannual Variation of Soil Methane Uptake in an Inner Mongolian Meadow Steppe

Yan¹,

Zhang²,

Chen³

et al. 2021

Preprint

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“…Previous studies have assessed the importance of grazing on soil N mineralization and cycling (Wu et al, 2011;Zhang et al, 2022), but results from the present study provide some new insights and further advancement. First, this study highlighted the specific impacts of grazing on N leaching in soil N cycling process in arid regions.…”

Section: Discussionmentioning

confidence: 85%

“…The prevailing low N availability in arid grassland is mainly because (1) N mineralization from organic forms is suppressed by higher aridity (Wang et al, 2014), (2) N availability has strong temporal and spatial variability during the growing seasons (S. Liu et al, 2021), and (3) large amount of N is being removed from the ecosystem, most of the sheep excrement is easily lost through volatilization and nitrate leaching (Graham et al, 2022). The rate of soil N mineralization and the overall amount of soil N significantly impact soil NH 4 + ‐N and NO 3 − ‐N that can be absorbed and used by aboveground vegetation, and therefore, these factors are important for determining soil N availability in grassland (Zhang et al, 2022). Many studies reported the effect of grazing on soil N process (Lang et al, 2021; Mosier et al, 2021; Zhou et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Grazing regulates soil N cycling of annual pastures by enhancing soil N turnover in arid climate condition

Guo,

Ning,

Lou

et al. 2023

Land Degrad Dev

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Nitrogen is the second limited factor in arid regions. Little information is available on soil N cycling and availability under grazing in arid regions, which is required to evaluate land‐use management with respect to soil N availability and dynamics. In 2011, we established a rotational grazing field experiment in arid grassland. We conducted experiments to explore the effects of herbivores grazing on soil net N mineralization and N processes via changes in soil temperature, moisture, pH, and microbial biomass nitrogen (MBN) in 2016 and 2017. Our results showed that grazing did not alter soil N mineralization because higher soil moisture and soil MBN under grazing had positive and negative effects on soil N mineralization, thereby balancing soil N mineralization. Plant N uptake at the grazing plots was, nevertheless, 23% higher than that at the non‐grazing plots. These demonstrated that grazing potentially improved soil inorganic N availability and alleviated soil N limitation in arid regions. Soil nitrification was main pathway of N transformation in arid regions. Grazing improved soil accumulation of NO3− content, resulting in environmental problems (such as N2O emission and N leaching); however, grazing had a little effect (~15% increase) on soil N leaching and (~7% decrease) on N2O emission. These N processes reflect important mechanisms of resilience and ecosystem stability under grazing in an N‐limited environment. Our results provide an important perspective for grassland management, aiming to maintain soil N supplying capacity in annual pasture sustainably. Overall, our study suggests that grazing is an effective management practice for the sustainable usage of local grasslands, as it improves soil physicochemical and biological properties, which, in turn, increases N supply.

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Stocking rate changed the magnitude of carbon sequestration and flow within the plant-soil system of a meadow steppe ecosystem

Jin

Yan

et al. 2021

Plant Soil

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Effects of stocking rate on the interannual patterns of ecosystem biomass and soil nitrogen mineralization in a meadow steppe of northeast China

Cited by 19 publications

References 57 publications

Effects of Livestock Grazing on Interannual Variation of Soil Methane Uptake in an Inner Mongolian Meadow Steppe

Effects of Livestock Grazing on Interannual Variation of Soil Methane Uptake in an Inner Mongolian Meadow Steppe

Grazing regulates soil N cycling of annual pastures by enhancing soil N turnover in arid climate condition

Stocking rate changed the magnitude of carbon sequestration and flow within the plant-soil system of a meadow steppe ecosystem

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