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Improved grazing management may increase soil carbon sequestration in temperate steppe.

Chen W, Huang D, Liu N, Zhang Y, Badgery WB, Wang X, Shen Y - Sci Rep (2015)

Bottom Line: While deferred grazing (RHM and RMH) sequestered less soil carbon compared to MMM, they showed higher standing root mass, maintained a more desirable pasture composition, and had better ability to retain soil N.Constant high grazing pressure (HHH) caused diminished above- and belowground plant production, more soil N losses and an unfavorable microbial environment and had reduced carbon input.Overall, the soil carbon sequestration in the temperate grassland is affected by the grazing regime that is applied, and grazing can be altered to improve soil carbon sequestration in the temperate steppe.

View Article: PubMed Central - PubMed

Affiliation: Department of Grassland Science, College of Animal Science and Technology, China Agricultural University, West Road 2 Yuan Ming Yuan, Beijing 100193, P.R. China.

ABSTRACT
Different grazing strategies impact grassland plant production and may also regulate the soil carbon formation. For a site in semiarid temperate steppe, we studied the effect of combinations of rest, high and moderate grazing pressure over three stages of the growing season, on the process involved in soil carbon sequestration. Results show that constant moderate grazing (MMM) exhibited the highest root production and turnover accumulating the most soil carbon. While deferred grazing (RHM and RMH) sequestered less soil carbon compared to MMM, they showed higher standing root mass, maintained a more desirable pasture composition, and had better ability to retain soil N. Constant high grazing pressure (HHH) caused diminished above- and belowground plant production, more soil N losses and an unfavorable microbial environment and had reduced carbon input. Reducing grazing pressure in the last grazing stage (HHM) still had a negative impact on soil carbon. Regression analyses show that adjusting stocking rate to ~5SE/ha with ~40% vegetation utilization rate can get the most carbon accrual. Overall, the soil carbon sequestration in the temperate grassland is affected by the grazing regime that is applied, and grazing can be altered to improve soil carbon sequestration in the temperate steppe.

No MeSH data available.


Related in: MedlinePlus

Changes induced by grazing regimes in soil microbial community structure expressed as relative abundance of fungi (a) bacteria (b) and fungi:bacteria ratio (c) from a typical steppe. Solid symbols with different lowercase letters indicate significant differences (P < 0.05) in the abundance of corresponding microbial group. Values are mean ± SE. Sap saprophytic fungi, AM arbuscular mycorrhiza, G( + ) Gram-positive bacteria, G( − ) Gram-negative bacteria, Actino actinomycetes bacteria.
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f7: Changes induced by grazing regimes in soil microbial community structure expressed as relative abundance of fungi (a) bacteria (b) and fungi:bacteria ratio (c) from a typical steppe. Solid symbols with different lowercase letters indicate significant differences (P < 0.05) in the abundance of corresponding microbial group. Values are mean ± SE. Sap saprophytic fungi, AM arbuscular mycorrhiza, G( + ) Gram-positive bacteria, G( − ) Gram-negative bacteria, Actino actinomycetes bacteria.

Mentions: Grazing changed the relative abundance of the microbial functional groups (Fig. 7a–c). The relative abundance of Arbuscular mycorrhiza was significantly lower in HHH, HHM and MMM than in the two deferred grazing regimes (Duncan’s multiple-range tests, p < 0.05; Fig. 7a). The Gram ( + ) bacteria, which had the highest abundance in the microbial community, showed significantly higher abundance levels in HHH and HHM than RMH and RHM (p < 0.05), but exhibited no difference when compared with MMM (p > 0.05; Fig. 7b). The fungi:bacteria ratios (F:B) observed in HHH, HHM and MMM were lower than those in RHM and RMH (p < 0.05; Fig. 7c).


Improved grazing management may increase soil carbon sequestration in temperate steppe.

Chen W, Huang D, Liu N, Zhang Y, Badgery WB, Wang X, Shen Y - Sci Rep (2015)

Changes induced by grazing regimes in soil microbial community structure expressed as relative abundance of fungi (a) bacteria (b) and fungi:bacteria ratio (c) from a typical steppe. Solid symbols with different lowercase letters indicate significant differences (P < 0.05) in the abundance of corresponding microbial group. Values are mean ± SE. Sap saprophytic fungi, AM arbuscular mycorrhiza, G( + ) Gram-positive bacteria, G( − ) Gram-negative bacteria, Actino actinomycetes bacteria.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4490272&req=5

f7: Changes induced by grazing regimes in soil microbial community structure expressed as relative abundance of fungi (a) bacteria (b) and fungi:bacteria ratio (c) from a typical steppe. Solid symbols with different lowercase letters indicate significant differences (P < 0.05) in the abundance of corresponding microbial group. Values are mean ± SE. Sap saprophytic fungi, AM arbuscular mycorrhiza, G( + ) Gram-positive bacteria, G( − ) Gram-negative bacteria, Actino actinomycetes bacteria.
Mentions: Grazing changed the relative abundance of the microbial functional groups (Fig. 7a–c). The relative abundance of Arbuscular mycorrhiza was significantly lower in HHH, HHM and MMM than in the two deferred grazing regimes (Duncan’s multiple-range tests, p < 0.05; Fig. 7a). The Gram ( + ) bacteria, which had the highest abundance in the microbial community, showed significantly higher abundance levels in HHH and HHM than RMH and RHM (p < 0.05), but exhibited no difference when compared with MMM (p > 0.05; Fig. 7b). The fungi:bacteria ratios (F:B) observed in HHH, HHM and MMM were lower than those in RHM and RMH (p < 0.05; Fig. 7c).

Bottom Line: While deferred grazing (RHM and RMH) sequestered less soil carbon compared to MMM, they showed higher standing root mass, maintained a more desirable pasture composition, and had better ability to retain soil N.Constant high grazing pressure (HHH) caused diminished above- and belowground plant production, more soil N losses and an unfavorable microbial environment and had reduced carbon input.Overall, the soil carbon sequestration in the temperate grassland is affected by the grazing regime that is applied, and grazing can be altered to improve soil carbon sequestration in the temperate steppe.

View Article: PubMed Central - PubMed

Affiliation: Department of Grassland Science, College of Animal Science and Technology, China Agricultural University, West Road 2 Yuan Ming Yuan, Beijing 100193, P.R. China.

ABSTRACT
Different grazing strategies impact grassland plant production and may also regulate the soil carbon formation. For a site in semiarid temperate steppe, we studied the effect of combinations of rest, high and moderate grazing pressure over three stages of the growing season, on the process involved in soil carbon sequestration. Results show that constant moderate grazing (MMM) exhibited the highest root production and turnover accumulating the most soil carbon. While deferred grazing (RHM and RMH) sequestered less soil carbon compared to MMM, they showed higher standing root mass, maintained a more desirable pasture composition, and had better ability to retain soil N. Constant high grazing pressure (HHH) caused diminished above- and belowground plant production, more soil N losses and an unfavorable microbial environment and had reduced carbon input. Reducing grazing pressure in the last grazing stage (HHM) still had a negative impact on soil carbon. Regression analyses show that adjusting stocking rate to ~5SE/ha with ~40% vegetation utilization rate can get the most carbon accrual. Overall, the soil carbon sequestration in the temperate grassland is affected by the grazing regime that is applied, and grazing can be altered to improve soil carbon sequestration in the temperate steppe.

No MeSH data available.


Related in: MedlinePlus