The response of soil organic carbon and nitrogen 10years after returning cultivated alpine steppe to grassland by abandonment or reseeding

Shang, Zhanhuan; Cao, Jingjuan; Guo, Ruiying; Long, Ruijun; Deng, Bo

doi:10.1016/j.catena.2014.03.006

Cited by 49 publications

(34 citation statements)

References 45 publications

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“…Our results also revealed that the rate of SOC change was higher in the surface (0–10) than in the deeper soil (10–100) in RG5 (Figure a), which was similar to the results of previous research (Guo & Gifford ; Deng et al , ; Shang et al , ). The main reason can be attributed to the different C sequestration mechanisms in the surface and deeper soils.…”

Section: Discussionsupporting

confidence: 93%

Soil Organic Carbon and Inorganic Carbon Accumulation Along a 30‐year Grassland Restoration Chronosequence in Semi‐arid Regions (China)

Liu

Dang

Tian³

et al. 2016

Land Degrad Dev

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Carbon accumulation is an important research topic for grassland restoration. It is requisite to determine the dynamics of the soil carbon pools [soil organic carbon (SOC) and soil inorganic carbon (SIC)] for understanding regional carbon budgets. In this study, we chose a grassland restoration chronosequence (cropland, 0 years; grasslands restored for 5, 15 and 30 years, i.e. RG5, RG15 and RG30, respectively) to compare the SOC and SIC pools in different soil profiles. Our results showed that SOC stock in the 0‐ to 100‐cm soil layer showed an initial decrease in RG5 and then an increase to net C gains in RG15 and RG30. Because of a decrease in the SIC stock, the percentage of SOC stock in the total soil C pool increased across the chronosequence. The SIC stock decreased at a rate of 0·75 Mg hm−2 y−1. The change of SOC was higher in the surface (0–10 cm, 0·40 Mg hm−2 y−1) than in the deeper soil (10–100 cm, 0·33 Mg hm−2 y−1) in RG5. The accumulation of C commenced >5 years after cropland conversion. Although the SIC content decreased, the SIC stock still represented a larger percentage of the soil C pool. Moreover, the soil total carbon showed an increasing trend during grassland restoration. Our results indicated that the soil C sequestration featured an increase in SOC, offsetting the decrease in SIC at the depth of 0–100 cm in the restored grasslands. Therefore, we suggest that both SOC and SIC should be considered during grassland restoration in semi‐arid regions. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Discussionsupporting

confidence: 93%

Soil Organic Carbon and Inorganic Carbon Accumulation Along a 30‐year Grassland Restoration Chronosequence in Semi‐arid Regions (China)

Liu

Dang

Tian³

et al. 2016

Land Degrad Dev

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“…In this study, with plant biomass being harvested or removed, the total nitrogen content of the soil significantly declined, leading to a lower C:N ratio at both soil depths under grazing and cultivation treatments. A lower C:N ratio can accelerate the decomposition process [24], which indicated that more SOC was breaking down, leaving less SOC in grazing and cropland plots.…”

Section: Effects Of Grazing and Cultivation On Soc Stockmentioning

confidence: 99%

Differential Responses of Soil Microbial Community to Four-Decade Long Grazing and Cultivation in a Semi-Arid Grassland

et al. 2017

Sustainability

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Grazing and cultivation are two important management practices worldwide that can cause significant soil organic carbon (SOC) losses. However, it remains elusive how soil microbes have responded to soil carbon changes under these two practices. Based on a four-decade long field experiment, this study investigated the effects of grazing and cultivation on SOC stocks and microbial properties in the semi-arid grasslands of China. We hypothesize that grazing and cultivation would deplete SOC and depress microbial activities under both practices. However, our hypotheses were only partially supported. As compared with the adjacent indigenous grasslands, SOC and microbial biomass carbon (MBC) were decreased by 20% or more under grazing and cultivation, which is consistent with the reduction of fungi abundance by 40% and 71%, respectively. The abundance of bacteria and actinomycetes was decreased under grazing but increased under cultivation, which likely enhanced microbial diversity in cultivation. Invertase activity decreased under the two treatments, while urease activity increased under grazing. These results suggest that nitrogen fertilizer input during cultivation may preferentially favor bacterial growth, in spite of SOC loss, due to rapid decomposition, while overgrazing may deteriorate the nitrogen supply to belowground microbes, thus stimulating the microbial production of nitrogen acquisition enzymes. This decade-long study demonstrated differential soil microbial responses under grazing and cultivation and has important applications for better management practices in the grassland ecosystem.

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“…Previous studies indicated that plant composition, application of manure and reseeding could affect the stability of soil carbon and nitrogen as well as their decomposition rates (Meng et al, 2014;Shang et al, 2014). Moreover, the closed coupling of TN and TP with SOC levels was observed as increasing temperature and precipitation in a temperate grassland (Bai et al, 2010) and a degraded and restored alpine grassland (Dong et al, 2012;Li et al, 2014).…”

Section: Relationships Between Soc Tn and Tpmentioning

confidence: 97%

Effects of soil nutrients and climate factors on belowground biomass in an alpine meadow in the source region of the Yangtze-Yellow rivers, Tibetan Plateau of China

Wang

Sun

et al. 2016

J. Arid Land

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Improving our knowledge of the effects of environmental factors (e.g. soil conditions, precipitation and temperature) on belowground biomass in an alpine grassland is essential for understanding the consequences of carbon storage in this biome. The object of this study is to investigate the relative importance of soil nutrients and climate factors on belowground biomass in an alpine meadow in the source region of the Yangtze and Yellow rivers, Tibetan Plateau. Soil organic carbon (SOC), total nitrogen (TN) and total phosphorous (TP) contents and belowground biomass were measured at 22 sampling sites across an alpine meadow on the Tibetan Plateau. We analyzed the data by using the redundancy analysis to determine the main environmental factors affecting the belowground biomass and the contribution of each factor. The results showed that SOC, TN and TP were the main factors that influenced belowground biomass, and the contribution of SOC, TN and TP on biomass was in the range of 47.87%-72.06% at soil depths of 0-30 cm. Moreover, the combined contribution of annual mean temperature (AMT) and mean annual precipitation (MAP) on belowground biomass ranged from 0.92% to 4.10%. A potential mechanism for the differences in belowground biomass was caused by the variations in soil nitrogen and phosphorous, which were coupled with SOC. A significant correlation was observed between MAP and soil nutrients (SOC, TN and TP) at the soil depth of 0-10 cm (P<0.05). We concluded that precipitation is an important driving force in regulating ecosystem functioning as reflected in variations of soil nutrients (SOC, TN and TP) and dynamics of belowground biomass in alpine grassland ecosystems.Keywords: belowground biomass; soil organic carbon; soil nitrogen and phosphorus; climate factor; alpine meadow; Tibetan Plateau Citation: WANG Haiming, SUN Jian, LI Weipeng, WU Jianbo, CHEN Youjun, LIU Wenhui. 2016. Effects of soil nutrients and climate factors on belowground biomass in an alpine meadow in the source region of the Yangtze-Yellow rivers,

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The response of soil organic carbon and nitrogen 10years after returning cultivated alpine steppe to grassland by abandonment or reseeding

Cited by 49 publications

References 45 publications

Soil Organic Carbon and Inorganic Carbon Accumulation Along a 30‐year Grassland Restoration Chronosequence in Semi‐arid Regions (China)

Soil Organic Carbon and Inorganic Carbon Accumulation Along a 30‐year Grassland Restoration Chronosequence in Semi‐arid Regions (China)

Differential Responses of Soil Microbial Community to Four-Decade Long Grazing and Cultivation in a Semi-Arid Grassland

Effects of soil nutrients and climate factors on belowground biomass in an alpine meadow in the source region of the Yangtze-Yellow rivers, Tibetan Plateau of China

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