Underlying mechanism on source-sink carbon balance of grazed perennial grass during regrowth: Insights into optimal grazing regimes of restoration of degraded grasslands in a temperate steppe

Zhang, Zihe; Gong, Jirui; Li, Xiaobing; Ding, Yulong; Wang, Biao; Shi, Jiayu; Liu, Min; Yang, Bo

doi:10.1016/j.jenvman.2020.111439

Cited by 12 publications

(5 citation statements)

References 106 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The changes in biomass projective cover and density in gypseous and sandy rangelands decreased with increasing grazing intensity. Changes in rangeland phylogenetic indicators depending on the level of livestock grazing affect quality indicators (22).…”

Section: Resultsmentioning

confidence: 99%

“…Information about the importance of some plants in the desert regions of Uzbekistan is recorded in the works of local and foreign authors (16). Knowing the development trends of rangeland plants and their resistance to anthropogenic influences, it is possible to regulate livestock grazing thus keep rangeland ecosystems in a highly productive state (21,22). The aim of this study was to determine the changes the amount of photosynthetic pigments under different livestock grazing conditions of A. diffusa.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Changes of photosynthetic pigments of Artemisia diffusa under the influence of grazing stress of livestock grazing in Karnabchul semi-desert, Uzbekistan

et al. 2023

View full text Add to dashboard Cite

On the transformed natural rangelands of Karnabchul desert, the natural Artemisia diffusa studied four different grazing intensities the change in the amount of photosynthetic pigments (chlorophyll a, chlorophyll b, carotenoids). It was found that the amount of A. diffusa pigments also increased with increasing stress levels in livestock grazing. In general, different grazing intensities had a different impact on the morphological and physiological traits of plants, especially their photosynthetic pigments.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Changes of photosynthetic pigments of Artemisia diffusa under the influence of grazing stress of livestock grazing in Karnabchul semi-desert, Uzbekistan

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Sustainable grazing management is vital to conserve biodiversity and enhance the multiple ecosystem functions (Liu et al, 2019, 2022). Many published studies have shown inconsistent outcomes that the exclusion of grazing, compared to MtH grazing, increases ecosystem services (Qin et al, 2021; Zhang et al, 2021), reduces part of the ecosystem services (Xiang et al, 2021), or has no significant influence on ecosystem functions and service (Hao et al, 2021; Wang et al, 2021). Based on our in‐depth analyses, coupled with findings by other researchers, we summarize the following “speculative” mechanisms responsible for the outcomes of grazing activities on grassland ecosystem services: Grazing activity affects soil microbial biomass carbon—an essential component in soil C cycling.…”

Section: Discussionmentioning

confidence: 99%

“…However, the conclusions on the general tendency of grassland ecosystems in response to grazing activities were inconsistent, inconclusive, or even controversial. For example, studies showed that the exclusion of grazing increased ecosystem services (Qin et al, 2021; Zhang et al, 2021), decreased part of the ecosystem services (Xiang et al, 2021), or had no influence on the ecosystem functions and services (Hao et al, 2021; Wang et al, 2021). These inconsistent results are probably attributable to the complexity of plant–soil–microbe–environment interactions.…”

Section: Introductionmentioning

confidence: 99%

Plant biotype interacting grazing activity shapes grassland ecosystem functions

Wang,

Feng,

Sun

et al. 2023

Ecosphere

View full text Add to dashboard Cite

Grasslands play an essential role in maintaining the health of planet Earth, but many grasslands have lost their ecosystem services due to unsustainable management practices, such as overgrazing. Little is known about how grazing activity interacts with plant biotypes, impacting grassland ecosystem services. Here, we (1) assessed the relative performance of five plant biotypes in response to grazing activities and (2) determined the effectiveness of grazing exclusion in enhancing soil physiochemical properties in grasslands. The synthesis of 39,214 observations on plant‐, soil‐, and anthropogeny‐related factors from 88 published studies revealed that grazing exclusion increased aboveground plant biomass accumulation by 100.4% (±4.2 SE), belowground biomass by 70.2% (±25.7), total soil C content by 21.4% (±1.7), and soil organic carbon (SOC) concentration by 14.3% (±0.8), on average, as compared to moderate‐to‐heavy (MtH) grazing. Plant biotypes responded to grazing activities differently; alpine meadows increased total soil C content by 107.2%, alpine steppes increased SOC by 52.2%, but desert steppes decreased total C content by 21.8% under the grazing exclusion. All plant biotypes reduced soil bulk density by 6.4%–19.4% under grazing exclusion. Soil microbial community diversity responded to grazing activities inconsistently, ranging from an 18% decrease to a 26% increase in soil microbial diversity compared to MtH grazing. We conclude that selecting appropriate plant biotypes alongside improved grazing management will enhance grassland ecosystem functions and services as plant biotypes affect aboveground and belowground biomass and interface with soil physiochemical properties.

show abstract

“…cumulative GPP values at both paddocks suggest that there are compensatory mechanisms maintained similar CO2 assimilation at UG and GR. The regrowth of new leaves, which have greater stomatal conductance and photosynthetic capacity, associated with the higher penetration of solar radiation inside the canopy are the probable reasons for the higher carbon assimilation efficiency in grazed systems Zhang et al, 2021;Otieno et al, 2011). In addition, leaf regrowth contributed to maintaining T/ET at GR similar levels than the ones at UG in the end of the growing season (Fig.…”

Section: Cumulative Carbon and Water Fluxesmentioning

confidence: 98%

Partitioning evapotranspiration and carbon flux in a tallgrass prairie: effects of rainfall variability and grazing

Rocha¹

View full text Add to dashboard Cite

Partitioning evapotranspiration (ET) and carbon flux is key to understanding ecosystem responses to rainfall variability and management practices. In this study, we evaluated the effects of rainfall variability and grazing on carbon and water vapor fluxes in tallgrass prairies. In addition, a footprint model was used to assess the spatial representativeness of eddy covariance (EC) measurement and the influence of surface heterogeneity on energy balance closure (EBC). The research was conducted in two tallgrass prairie sites located in Kansas, U.S. The effects of rainfall variability on fluxes were evaluated during the 2017, 2018 and 2019 growing seasons. The impacts of grazing on fluxes were assessed during the 2003, 2004 and 2005 growing seasons. Carbon and water vapor fluxes were measured using the EC technique. Net ecosystem CO 2 exchange (NEE) partitioning into gross primary productivity (GPP) and ecosystem respiration (R eco ) was performed using the relationship between the air temperature and nighttime NEE data. ET partitioning into transpiration (T) and evaporation (E) was obtained using the concept of underlying water use efficiency (uWUE). To evaluate the uWUE approach, we compared daily E estimates obtained from the uWUE with E observations provided by microlysimeters (ML) during the 2018 growing season. EBC was poor during nighttime and stable atmospheric conditions, but was not affected by surface heterogeneity. The correlations between vertical wind velocity and scalars indicated that low-frequency processes affected EBC. The contribution of T to ET (T/ET) was lowest during the dry growing season (0.50) and higher during wet growing seasons (0.63 and 0.65). The relationship between uWUE approach and ML E measurements showed a Pearson correlation coefficient (r) of 0.42 and a root mean square error (RMSE) of 0.58 mm d -1 . Air temperature was the main environmental driver of T/ET during the wet growing seasons, while the subsurface soil moisture (0.45 m) was the main driver of T/ET during the dry growing season. Grazing did not affect GPP, but increased R eco (9.4%) and reduced NEE (11.9%). T/ET was reduced by grazing (7.0%), while ET increased by 3.3% due to the increase in E (26.6%). Our findings demonstrate that the precipitation variability not only has a direct impact on the ET components but also modulates the response of those components to other environmental drivers. In turn, grazing regime adopted in this tallgrass prairie impacts the carbon cycle more strongly than the water cycle. Keywords: Eddy covariance. Grasslands. Transpiration. Evaporation. Underlying water use efficiency.

show abstract

Underlying mechanism on source-sink carbon balance of grazed perennial grass during regrowth: Insights into optimal grazing regimes of restoration of degraded grasslands in a temperate steppe

Cited by 12 publications

References 106 publications

Changes of photosynthetic pigments of Artemisia diffusa under the influence of grazing stress of livestock grazing in Karnabchul semi-desert, Uzbekistan

Changes of photosynthetic pigments of Artemisia diffusa under the influence of grazing stress of livestock grazing in Karnabchul semi-desert, Uzbekistan

Plant biotype interacting grazing activity shapes grassland ecosystem functions

Partitioning evapotranspiration and carbon flux in a tallgrass prairie: effects of rainfall variability and grazing

Contact Info

Product

Resources

About