Changes in soil organic carbon and total nitrogen after 28 years grassland afforestation: effects of tree species, slope position, and soil order

Wei, Xiaorong; Shao, Mingan; Fu, Xiaoli; Horton, Robert

doi:10.1007/s11104-009-0243-3

Cited by 61 publications

(45 citation statements)

References 51 publications

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“…3 to 5. The decreasing trend in SOC stocks in the 0-to 100-cm layer in the present study was a natural phenomenon and in agreement with previous studies on the CLP (Han et al, 2010;Wei et al, 2010) and at other study sites with different vegetation (Omonode and Vyn, 2006). Little information about SOC below 100 cm is available for comparison.…”

Section: Depth Dependence Of Soil Organic Carbon Stockssupporting

confidence: 92%

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Wang

Han

Jing-bo

et al. 2015

Soil Science Soc of Amer J

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An accurate evaluation of soil organic C (SoC) stocks is important to C management and to understanding fully the role of soils in the C cycle. However, SoC stocks in deep soils and the factors that affect them have been largely ignored. We measured SoC stocks and other soil properties to a depth of 500 cm (n = 73) under three land uses in the Lao ye Man Qu watershed on the Chinese Loess Plateau. Similar patterns in the vertical distributions of SoC stocks were found under cropland, grassland, and shrubland. However, for the 0-to 200-cm soil layer, SoC stocks were significantly lower under shrubland than under either cropland or grassland. The SoC stocks under cropland, grassland, and shrubland in the 0-to 100-cm layer were 2.64 ± 0.67, 2.50 ± 0.69, and 1.99 ± 0.22 kg m −2 , respectively; in the 0-to 500-cm layer they were 8.34 ± 2.26, 8.37 ± 2.01, and 7.26 ± 1.00 kg m −2 , respectively. Significantly higher SoC stocks occurred in loamy than sandy soils (P < 0.01), and they were lower at the mid than at the upper and lower slope positions. However, SoC stocks were similar in sunlit and shaded soils. Pearson correlation analysis indicated that land use, soil texture, and soil water content significantly affected SoC stocks in each 100-cm soil layer to a depth of 500 cm. Effects of topographic features and pH varied with increasing depth. A considerable amount of SoC was stored in deep soils, indicating the SoC content dependence on time and depth. This information is essential for evaluating C fluxes, estimating C stocks, and for managing the C cycles in regions around the world with deep soils.

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Section: Depth Dependence Of Soil Organic Carbon Stockssupporting

confidence: 92%

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Wang

Han

Jing-bo

et al. 2015

Soil Science Soc of Amer J

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“…Pastures with grazing intensity strongly influenced soil organic carbon declines and/or increases after land conversion. If pastures are overgrazed, inputs from aboveground parts are reduced, and soil carbon stocks could have decreased (Murty et al 2002;Wei et al 2010). As expected, the difference is most pronounced in the top soil (0-20 cm) depth than in the lower soil depth (20-40 cm) for both soil organic matter and total nitrogen.…”

Section: Soil Organic Csupporting

confidence: 58%

Soil carbon and nitrogen losses following deforestation in Ethiopia

Berihu

Girmay

Sebhatleab

et al. 2016

Agron. Sustain. Dev.

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Ethiopia faces high risk of soil carbon depletion for nearly half of its total land mass largely due to forest clearing and continuous cultivation. Conversion of natural ecosystems to cultivated agriculture resulted in losses of between 20 and 50% of the soil C stocks in the first meter of the soil depth. Dry Afromontane forests of northern Ethiopia have faced vast exploitation, and almost all these forests have been converted to agricultural lands affecting the functionality and stability of agroecosystem. Here, we studied the effect of land use-land cover changes on soil organic C, total N, and soil C sequestration. Specifically, (a) we characterized major soils of the Desa'a Dry Afromontane forest, northern Ethiopia, and (b) we analyzed the organic C and total N contents of soils with varying land use-land cover types of the Desa'a Dry Afromontane forest. Results show that soil organic C (1.9%) and total N (0.3%) were higher for the middle landscape position than that observed for the upper and lower landscape positions. Soil organic C that ranged from 1.2 in farmland to 2.3% in dense forest also varied with land use-land cover types. Concentration of soil organic C was different among dense forest (2.3%), open forest (1.7%), grazing land (1.6%), and farmland (1.2%). Due to the effect of land use-land cover types, soil total N varied from 0.2% in the farmland to 0.3% in the dense forest. The soil organic C and total nitrogen of the top and lower layer soils were 2.0 and 1.5 and 0.2 and 0.3%, respectively. The soil organic C sequestration for dense forest was significantly higher (48.5 t ha ) than the lower soil layer. Thus, the top soil layers of dense forest at the middle landscape positions stored significant amount of soil organic carbon.

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“…The present results are consistent with the findings of Su and Zhao (2003), who reported higher SOC in stands of C. microphylla shrub than in active sand dunes. Wei et al (2010) compared the distribution of SOC and N in soils under canopies and in outer tree canopies in semi-arid areas and found that dry-climate, low-C soils had a potential for C sequestration after grassland to woodland conversion. Hu et al (2008) documented a significant potential for soil C sequestration with afforestation in Horqin sandy land, and revealed that Mongolian pine plantations in Horqin sandy land have a great potential to sequester C, which agreed with the present research.…”

Section: Soil Organic C and N Concentrationmentioning

confidence: 99%

Changes in soil organic carbon and nitrogen capacities of <i>Salix cheilophila</i> Schneid along a revegetation chronosequence in semi-arid degraded sandy land of the Gonghe Basin, Tibet Plateau

Jia

2014

Solid Earth

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Abstract. The Gonghe Basin is a sandified and desertified region of China, but the distribution of soil organic carbon (SOC) and total nitrogen (TN) along the cultivation chronosequence across this ecologically fragile region is not well understood. This study was carried out to understand the effects of restoration with Salix cheilophila for different periods of time (6, 11, 16, 21 years) to test whether it enhanced C and N storage. Soil samples, in four replications from seven depth increments (0-10, 10-20, 20-30, 30-50, 50-100, 100-150 and 150-200 cm), were collected in each stand. Soil bulk density, SOC, TN, aboveground biomass and root biomass were measured. Results indicated that changes occurred in both the upper and deeper soil layers with an increase in revegetation time. The 0-200 cm soil showed that the 6-year stand gained 3.89 Mg C ha −1 and 1.00 Mg N ha −1 , which accounted for 40.82 % of the original SOC and 11.06 % of the TN of the 0-year stand. The 11-year stand gained 7.82 Mg C ha −1 and 1.98 Mg N ha −1 in the 0-200 cm soil layers, accounting for 58.06 % of the SOC and 19.80 % of the TN of the 0-year stand. The 16-year stand gained 11.32 Mg C ha −1 and 3.30 Mg N ha −1 in the 0-200 cm soil layers, accounting for 66.71 % of the SOC and 21.98 % of the TN of the 0-year stand. The 21-year stand gained 13.05 Mg C ha −1 and 5.45 Mg N ha −1 from the same soil depth, accounting for 69.79 % of the SOC and 40.47 % of the TN compared with the 0-year stand. The extent of these changes depended on soil depth and plantation age. The results demonstrated that, as stand age increased, the storage of SOC and TN increased. These results further indicated that restoration with S. cheilophila has positive impacts on the Gonghe Basin and has increased the capacity of SOC sequestration and N storage. The shrub's role as carbon sink is compatible with system management and persistence. The findings are significant for assessing C and N sequestration accurately in semi-arid degraded high, cold sandy regions in the future.

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Changes in soil organic carbon and total nitrogen after 28 years grassland afforestation: effects of tree species, slope position, and soil order

Cited by 61 publications

References 51 publications

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Soil carbon and nitrogen losses following deforestation in Ethiopia

Changes in soil organic carbon and nitrogen capacities of <i>Salix cheilophila</i> Schneid along a revegetation chronosequence in semi-arid degraded sandy land of the Gonghe Basin, Tibet Plateau

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Changes in soil organic carbon and total nitrogen after 28 years grassland afforestation: effects of tree species, slope position, and soil order

Cited by 61 publications

References 51 publications

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Soil carbon and nitrogen losses following deforestation in Ethiopia

Changes in soil organic carbon and nitrogen capacities of &lt;i&gt;Salix cheilophila&lt;/i&gt; Schneid along a revegetation chronosequence in semi-arid degraded sandy land of the Gonghe Basin, Tibet Plateau

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Changes in soil organic carbon and nitrogen capacities of <i>Salix cheilophila</i> Schneid along a revegetation chronosequence in semi-arid degraded sandy land of the Gonghe Basin, Tibet Plateau