Effects of enclosure and grazing on carbon and water fluxes of sandy grassland

Sun, David; Li, Yulin; Zhao, Xueyong; Zuo, Xiaoan; Mao, Wei

doi:10.17521/cjpe.2015.0054

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6). This result is consistent with data from a northern temperate grassland in Canada (Flanagan et al, 2002) and a tallgrass prairie in the United States (Suyker et al, 2003). Annual herbaceous plants are vulnerable to decreased precipitation which decreases their productivity by reducing stomatal conductance and leaf area while simultaneously increasing the soil water deficit (Ford et al, 2008).…”

Section: Effects Of Precipitation On Carbon Fluxessupporting

confidence: 89%

“…In semiarid ecosystems such as our study site, summer precipitation supplies the majority of the annual precipitation and soil moisture for most of the annual plant growth (Emmerich and Verdugo, 2008;Sun et al, 2015). Our results showed that NEE was dominated by the total summer precipitation and by SWC at depths of 40 and 50 cm.…”

Section: Effects Of Environmental Factors On Seasonal Carbon Fluxesmentioning

confidence: 68%

“…6), this would have decreased carbon sequestration by the ecosystem. Previous studies showed that annual species such as the vegetation in our study area can be extremely vulnerable to drought (Jongen et al, 2011;Sun et al, 2015;Liu et al, 2016a). Drought was the main source of inter-annual variation in previous research on terrestrial carbon seques-tration as it decreases GPP and increases NEE (Webb et al, 1978;Sala et al, 1988;Ciais et al, 2005).…”

Section: Comparison With Other Arid and Semiarid Ecosystemsmentioning

confidence: 73%

See 2 more Smart Citations

Variations in diurnal and seasonal net ecosystem carbon dioxide exchange in a semiarid sandy grassland ecosystem in China's Horqin Sandy Land

Niu

Yun

et al. 2020

Biogeosciences

View full text Add to dashboard Cite

Abstract. Grasslands are major terrestrial ecosystems in arid and semiarid regions, and they play important roles in the regional carbon dioxide (CO2) balance and cycles. Sandy grasslands are sensitive to climate change, yet the magnitudes, patterns, and environmental controls of their CO2 flows are poorly understood for some regions (e.g., China's Horqin Sandy Land). Here, we report the results from continuous year-round CO2 flux measurements for 5 years from a sandy grassland in China's Horqin Sandy Land. The grassland was a net CO2 source at an annual scale with a mean annual net ecosystem CO2 exchange (NEE) of 49 ± 8 gCm-2yr-1 for the years for which a complete dataset was available (2015, 2016, and 2018). Annual precipitation had the strongest effect on annual NEE; grassland carbon sequestration increased with the increasing precipitation since NEE depended on annual precipitation. In the spring, NEE decreased (i.e., C sequestration increased) with increasing magnitude of effective precipitation pulses, total monthly precipitation, and soil temperature (Tsoil). In the summer, NEE was dominated by the total seasonal precipitation and high precipitation pulses (> 20 mm). In the autumn, NEE increased (i.e., C sequestration decreased) with increasing effective precipitation pulses, Tsoil, and near-surface soil water content (SWC) but decreased with increased SWC deeper in the soil. In the winter, NEE decreased with increasing Tsoil and SWC. The sandy grassland was a net annual CO2 source because drought decreased carbon sequestration by the annual plants. Long-term observations will be necessary to reveal the true source or sink intensity and its response to environmental and biological factors.

show abstract

Section: Effects Of Precipitation On Carbon Fluxessupporting

confidence: 89%

Section: Effects Of Environmental Factors On Seasonal Carbon Fluxesmentioning

confidence: 68%