Temporal variation of soil organic matter content and potential determinants in Tibet, China

Dai, Fuqiang; Su, Zhengan; Liu, Shuzhen; Liu, Gangcai

doi:10.1016/j.catena.2011.01.015

Cited by 33 publications

(21 citation statements)

References 50 publications

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“…The average annual precipitation is less than 1000 mm in most areas of Tibet; annual precipitation rates can reach up to 2817 mm in the east and drop down to approximately 70 mm in the west (Dai et al. ).…”

Section: Methodsmentioning

confidence: 99%

Carbon, nitrogen, and phosphorus storage in alpine grassland ecosystems of Tibet: effects of grazing exclusion

Lü

Yan

Sun

et al. 2015

Ecology and Evolution

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In recent decades, alpine grasslands have been seriously degraded on the Tibetan Plateau and grazing exclusion by fencing has been widely adopted to restore degraded grasslands since 2004. To elucidate how alpine grasslands carbon (C), nitrogen (N), and phosphorus (P) storage responds to this management strategy, three types of alpine grassland in nine counties in Tibet were selected to investigate C, N, and P storage in the environment by comparing free grazing (FG) and grazing exclusion (GE) treatments, which had run for 6–8 years. The results revealed that there were no significant differences in total ecosystem C, N, and P storage, as well as the C, N, and P stored in both total biomass and soil (0–30 cm) fractions between FG and GE grasslands. However, precipitation played a key role in controlling C, N, and P storage and distribution. With grazing exclusion, C and N stored in aboveground biomass significantly increased by 5.7 g m−2 and 0.1 g m−2, respectively, whereas the C and P stored in the soil surface layer (0–15 cm) significantly decreased by 862.9 g m−2 and 13.6 g m−2, respectively. Furthermore, the storage of the aboveground biomass C, N, and P was positively correlated with vegetation cover and negatively correlated with the biodiversity index, including Pielou evenness index, Shannon–Wiener diversity index, and Simpson dominance index. The storage of soil surface layer C, N, and P was positively correlated with soil silt content and negatively correlated with soil sand content. Our results demonstrated that grazing exclusion had no impact on total C, N, and P storage, as well as C, N, and P in both total biomass and soil (0–30 cm) fractions in the alpine grassland ecosystem. However, grazing exclusion could result in increased aboveground biomass C and N pools and decreased soil surface layer (0–15 cm) C and P pools.

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Section: Methodsmentioning

confidence: 99%

Carbon, nitrogen, and phosphorus storage in alpine grassland ecosystems of Tibet: effects of grazing exclusion

Lü

Yan

Sun

et al. 2015

Ecology and Evolution

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“…Due to geographical conditions and atmospheric circulation, the average annual temperature is rather low with a large diurnal range, and the temperature varies from 18 to −4 • C and decreases gradually from the southeast to the northwest. The average annual precipitation is less than 1000 mm in most areas of Tibet, reaching 2817 mm in the east and decreasing to approximately 70 mm in the west (Dai et al, 2011).…”

Section: Study Areamentioning

confidence: 99%

Short-term grazing exclusion has no impact on soil properties and nutrients of degraded alpine grassland in Tibet, China

et al. 2015

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Abstract. Since the 1980s, alpine grasslands have been seriously degraded on the Tibetan Plateau. Grazing exclusion by fencing has been widely adopted to restore degraded grasslands. To clarify the effect of grazing exclusion on soil quality, we investigated soil properties and nutrients by comparing free-grazing (FG) and grazing exclusion (GE) grasslands in Tibet. Soil properties -including soil bulk density, pH, particle size distributions, and proportion of aggregatesshowed no significant difference between FG and GE plots.

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“…Furthermore, organic compounds found in soil allow relatively stable reservoirs to be formed that limit CO 2 losses to the atmosphere [10,11]. Soil organic carbon content can vary based on edaphic and morphosedimentological conditions, in particular in riverbanks with different hydrological, sedimentological and topographical conditions [12][13][14][15]. Sediment transported by currents during freshets, for instance, can modify soil carbon content and result in soil depletion or enrichment [16,17].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Floods on Organic Carbon Concentrations in Alluvial Soils along Hydrological Gradients Using a Digital Elevation Model (DEM)

Saint-Laurent

Paradis

Drouin

et al. 2016

Water

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This study examines the spatial distribution of the organic carbon found in alluvial soils affected by successive floods. In flood zones, very little is known of the processes associated with the development of soils subjected to frequent flooding, in particular with respect to the accumulation of litter and organic carbon concentrations. The aim of this study is to better understand the distribution of organic carbon based on various hydrological gradients associated with flood recurrence. A digital elevation model was developed from LIDAR data to assess the microtopography of the site, and further delineate floodplains and no-flood zones. Various soil properties were considered in addition to organic carbon, such as pH, soil bulk density, litter, drainage, and topographic levels (elevation). The results show that the soils in the frequent-flood zones (FFz, recurrence of 0-20 years) have significantly less total organic carbon than the soils in the no-flood zones (NFz) and the moderate flood zones (MFz,. Average values obtained for the surface horizons (0-20 cm) vary by 1.74%˘0.85% (FFz), 3.34%˘1.09% (MFz) and 3.54%˘1.77% (NFz), respectively. The absence of ground litter in the frequent flood zones helps decrease the input of organic matter in the surface horizons and progressively results in soil depletion.

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Temporal variation of soil organic matter content and potential determinants in Tibet, China

Cited by 33 publications

References 50 publications

Carbon, nitrogen, and phosphorus storage in alpine grassland ecosystems of Tibet: effects of grazing exclusion

Carbon, nitrogen, and phosphorus storage in alpine grassland ecosystems of Tibet: effects of grazing exclusion

Short-term grazing exclusion has no impact on soil properties and nutrients of degraded alpine grassland in Tibet, China

Impacts of Floods on Organic Carbon Concentrations in Alluvial Soils along Hydrological Gradients Using a Digital Elevation Model (DEM)

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