Effects of grazing and climate change on aboveground standing biomass and sheep live weight changes in the desert steppe in Inner Mongolia, China

A - Papers appearing in refereed journals

Wang, Y., Wang, Z., Wu, L., Li, H., Li, J., Zhu, A., Jin, Y. and Han, G. 2024. Effects of grazing and climate change on aboveground standing biomass and sheep live weight changes in the desert steppe in Inner Mongolia, China. Agricultural Systems. 217 (May), p. 103916. https://doi.org/10.1016/j.agsy.2024.103916

AuthorsWang, Y., Wang, Z., Wu, L., Li, H., Li, J., Zhu, A., Jin, Y. and Han, G.
Abstract

CONTEXT
The Stipa breviflora desert steppe ecosystem is fragile and sensitive to climate change and grazing disturbance. Previous studies have reported the effects of climate change and grazing on aboveground standing biomass of the plant community and sheep live weight, however, the interaction between climate change and grazing remains unclear. Process models have become ideal tools for the evaluation of the effects of grazing management practices under climate change.

OBJECTIVE
We used the Soil-Plant-Atmosphere Continuum System (SPACSYS) model to investigate aboveground standing biomass and the live weight of sheep in the desert steppe of Inner Mongolia under future climate change scenarios and different grazing management. The results will be used to inform adaptive management strategies.

METHODS
The grazing experiment consisted of four treatments: no grazing (0 sheep ha−1 half year−1), light stocking rate (0.91 sheep ha−1 half year−1), moderate stocking rate (1.82 sheep ha−1 half year−1), and high stocking rate (2.71 sheep ha−1 half year−1). We used observed data on soil temperature, soil volumetric water content, changes to sheep live weight, and aboveground standing biomass of plant community to provide parameterization and validation for the SPACSYS model. We then predicted aboveground standing biomass of the plant community and sheep live weight changes for different grazing management under three representative concentration pathways (RCP) scenarios (RCP 2.6, RCP 4.5, and RCP 8.5) from 2021 to 2100.

RESULTS AND CONCLUSIONS
Moderate and high stocking rates decreased aboveground standing biomass and sheep live weight changes more than the light stocking rate. A light stocking rate can maintain higher aboveground standing biomass and sheep live weight as well as meet production requirements. Therefore, a light stocking rate is a potentially effective management approach to improve food production security and combat global climate change in the desert steppe.

SIGNIFICANCE
The model can inform management strategies for grazing in the desert steppe under climate change, supporting efforts to maintain the stability of the steppe ecosystem and increase economic benefits, while also providing a theoretical basis for adaptive management in the desert steppe

KeywordsGrazing ; Climate change; SPACSYS model; Aboveground standing biomass; Sheep live weight
Year of Publication2024
JournalAgricultural Systems
Journal citation217 (May), p. 103916
Digital Object Identifier (DOI)https://doi.org/10.1016/j.agsy.2024.103916
Open accessPublished as non-open access
FunderNational Natural Science Foundation of China
Publisher's version
Output statusPublished
Publication dates
Online11 Mar 2024
Publication process dates
Accepted03 Mar 2024
PublisherElsevier Sci Ltd
ISSN0308-521X

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