Using the CENTURY model to assess the impact of land reclamation and management practices in oasis agriculture on the dynamics of soil organic carbon in the arid region of North-western China

Xu, Weizhou; Chen, Xi; Luo, Geping; Qing, Lin

doi:10.1016/j.ecocom.2010.11.003

Cited by 24 publications

(13 citation statements)

References 40 publications

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“…However, the obvious increase occurred at 0-20-, 20-40-and 40-200-cm depths in 80-and 100-year farmlands. The sequestration of SOC and TN in the topsoil was also observed in other oasis farmlands in northwest China (Su et al 2010;Li et al 2010;Xu et al 2011), but was contrary to the result observed by Lobe et al (2001) who found that prolonged arable cropping leads to severe SOC loss in dry regions with sandy soils in the South African Highveld, and reached equilibrium after 34 years, but the loss continued if the cropping was prolonged even after almost 100 years. Generally, ecosystem C sequestration is determined by the law of mass conservation and the availability of key nutrient elements, such as N or P (Hessen et al 2004;Kirkby et al 2011).…”

Section: The Changes In Soc and Tn Stocks Over 100 Years' Cultivationcontrasting

confidence: 52%

“…Land use changes may have significant positive or negative effects on soil quality (Mojiri et al 2011;Xu et al 2011). However, assessing soil quality is difficult, because unlike water and air quality for which standards have been established primarily by legislation, soil quality assessments are purpose oriented and site specific (Karlen et al 1994).…”

Section: Introductionmentioning

confidence: 99%

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Cultivation effects on the carbon and nitrogen dynamics at depth in oasis farmlands of the Southern Tarim Basin, China

Huang

Zeng

Lei

2014

Soil Science and Plant Nutrition

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The profile distribution of soil organic carbon (SOC) and total nitrogen (TN) are important indicators for predicting and simulating the effects of human activities on soil fertility and quality. However, most studies have focused on these changes in surface soil or the top 100 cm of short-term cultivated farmlands in arid regions. In the present study, farmlands cultivated for 0, 10, 15, 30, 80 and 100 years in the Cele oasis, at the southern margin of the Tarim Basin, were selected to examine cultivation effects on the vertical distribution of SOC and TN to 200 cm, and to try to find a rational approach to increase the SOC and TN stocks in cultivated farmland. The results showed that although SOC concentration and stock increased significantly at 0-20 cm along the chronosequence, the total SOC stock of the 0-200 cm layer was 13.8% lower in 30-year farmlands and 88.3% higher in 100-year farmlands than that in natural soil due to the corresponding decrease in 30-year farmlands and significant increase in 100-year farmlands at 40-200 cm depth. Cultivation also significantly increased TN concentration and stock at 0-20 cm, but the obvious increase of TN stock at 0-200 cm was only found in 100-year farmlands due to the slight change of TN stock at 40-200 cm except for 100-year farmlands. C and N stocks in the 40-200 cm layer of the cultivated farmlands contributed respectively 67.6 and 61.9% of the total SOC and TN stocks of 0-200 cm, further confirming the importance of C and N cycling in the deep layer. The continuous applications of N fertilizers combined with organic manures and irrigation with silt-laden river water contributed greatly to the increase of SOC and TN stocks. These results suggest that the oasis farmland has great potential capacity to accumulate SOC and TN only if long-term cultivation (> 30 years) and the enhancement of organic materials are implemented.

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Section: The Changes In Soc and Tn Stocks Over 100 Years' Cultivationcontrasting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Cultivation effects on the carbon and nitrogen dynamics at depth in oasis farmlands of the Southern Tarim Basin, China

Huang

Zeng

Lei

2014

Soil Science and Plant Nutrition

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“…Historically, herd farmers adopted a nomadic mode of grazing (Figure a), a practice that exerted little pressure on grasslands. From the 1950s to 1980s, large areas of grasslands were converted to cropland (Xu et al, ), which decreased the availability of grasslands for nomadic grazing (Su et al, ). Heavy grazing with high stocking rates severely degraded the remaining grasslands (Figure b) and accelerated the degradation (Figure c).…”

Section: Background Of Northern China Grasslandsmentioning

confidence: 99%

“…In China, about 390 million ha of grasslands (Wang et al, ) cover 41% of the total land area (Anonymous, ). Of which, about 84% (or 330 million ha) is suitable for grazing, but a significant proportion has been degraded due to overgrazing (Wu, Zhao, Yu, Luo, & Pan, ), reclamation to croplands (Xu, Chen, Luo, & Lin, ), and exploitation of by‐products or mineral resources (Dong & Yang, ). Degraded grasslands are characterized by diminished vegetation coverage and deteriorated soil structure and function and are vulnerable to erosion and desertification (Li, Zhao, Zhang, Zhang, & Shirato, ).…”

Section: Introductionmentioning

confidence: 99%

Grazing exclusion—An effective approach for naturally restoring degraded grasslands in Northern China

et al. 2018

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Nearly 90% of the 390 million ha of grasslands in northern China are degraded. ‘Grazing exclusion’ has been implemented as a nature‐based solution to rejuvenate degraded grasslands, but the effectiveness of the rejuvenation processes is uncertain. Here, we investigated the effects of grazing exclusion on aboveground plant community traits, soil physiochemical and biological properties, and the mechanisms responsible for enhanced grassland rejuvenation. A meta‐analysis across various studies was used to assess the effectiveness. On average, grazing exclusion improved vegetation coverage by 18.5 percentage points and increased aboveground biomass by 1.13 t ha−1 and root biomass by 1.27 t ha−1, which represent an increase of 84%, 246%, and 31%, respectively, compared with continuous grazing practices. Grazing exclusion reduced soil bulk density by 13.7% and increased soil water content by 68.9%. Grasslands under grazing exclusion increased soil organic carbon (SOC) in the 0‐ to 15‐cm depth by 3.95 (±0.35 Std err) t ha−1 and total soil N, available N, and total soil P in the 0‐ to 40‐cm depth by 2.39 (±0.14), 0.83 (±0.37), and 1.96 (±0.44) t ha−1, respectively, compared with continuous grazing; these values represent an increase of 31%, 25%, 23%, and 14%, respectively. Prolonging the duration (years) of grazing practices enlarged the differences in SOC and soil N content between grazing exclusion and continuous grazing. Grazing exclusion has improved plant community traits and enhanced soil physiochemical and biological properties of degraded grasslands, and thus, this ‘nature‐based’ approach can serve as an effective means to rejuvenate degraded grasslands.

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“…Others have used geographic information system (GIS)-based erosion models to identify carbon redistribution Avtar et al 2011). The Soil Water Assessment Tool (SWAT) has been used to simulate the transport processes of soil carbon; however, these models require a considerable number of ecophysiological and site parameters (Kemanian et al 2011;Xu et al 2011), and some parameters are rarely available.…”

mentioning

confidence: 99%

Assessment of the redistribution of soil carbon using a new index—a case study in the Haihe River Basin, North China

Chen

Zhou

et al. 2014

Environ Monit Assess

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Using the CENTURY model to assess the impact of land reclamation and management practices in oasis agriculture on the dynamics of soil organic carbon in the arid region of North-western China

Cited by 24 publications

References 40 publications

Cultivation effects on the carbon and nitrogen dynamics at depth in oasis farmlands of the Southern Tarim Basin, China

Cultivation effects on the carbon and nitrogen dynamics at depth in oasis farmlands of the Southern Tarim Basin, China

Grazing exclusion—An effective approach for naturally restoring degraded grasslands in Northern China

Assessment of the redistribution of soil carbon using a new index—a case study in the Haihe River Basin, North China

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