Carbon sequestration in the total and light fraction soil organic matter along a chronosequence in grazing exclosures in a semiarid degraded sandy site in China

Chen, YinPing; Li, Yuqiang; Awada, Tala; Han, Jianqiao; Luo, Yongqing

doi:10.3724/sp.j.1227.2012.00411

Cited by 11 publications

(8 citation statements)

References 29 publications

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“…In contrast to our expectation and the results of previous studies conducted in Ethiopia and similar environments (Mekuria et al, 2011;Chen et al, 2012;Nianpeng et al, 2012), the results of the present study did not show a clear trend in some soil properties (e.g, CEC and soil moisture) and SOM with exclosure age (Tables III and IV; Figure 2). This could indicate that the influence of exclosure age on soil properties and SOM is moderated by other factors related to management.…”

Section: Sitescontrasting

confidence: 99%

“…Chen et al . () suggested that exclosures have the capacity to increase soil C sequestration; however, decades will be required to detect the change in soil C. Reeder et al . () emphasize the importance of semiarid and arid ecosystems of including inorganic C in evaluating the impacts of exclosures on soil C, as long‐term studies required to detect change in SOC.…”

Section: Discussionmentioning

confidence: 99%

“…In this line, Zarekia et al (2012) indicated that in arid and semiarid climate condition, which is the case in our study site, detecting the effects of exclosures and rest rotation grazing systems on soil properties requires a longer time. Chen et al (2012) suggested that exclosures have the capacity to increase soil C sequestration; however, decades will be required to detect the change in soil C. Reeder et al (2004) emphasize the importance of semiarid and arid ecosystems of including inorganic C in evaluating the impacts of exclosures on soil C, as long-term studies required to detect change in SOC.…”

Section: Sitesmentioning

confidence: 99%

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Soil Restoration after seven Years of Exclosure Management in Northwestern Ethiopia

Mekuria

Langan

Noble³

et al. 2016

Land Degrad Dev

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Ecological restoration through exclosure establishment has become an increasingly important approach to reversing degraded ecosystems in rangelands worldwide. The present study was conducted in northwestern Ethiopia where policy programs are aiming to restore degraded lands. Changes in soil properties following establishing exclosures on communal grazing lands were investigated. A space-for-time substitution approach was used to monitor changes in soil properties after conversion of communal grazing lands to exclosures with ages of establishment ranging from 1 to 7 years. Significant differences in soil pH, exchangeable cations, cation exchange capacity, soil moisture content and bulk density were observed within exclosures and between exclosures and communal grazing land. Communal grazing land displayed significantly higher soil total nitrogen, phosphorus and potassium compared with exclosures. Exclosures did not display significantly higher soil organic matter content when compared with the communal grazing land. The results confirm that more than 7 years after the establishment of exclosures is required to detect significant improvements in most of the investigated soil properties. Prohibition of the practice of grass harvesting during the first 3 to 5 years following the establishment of exclosure, and decreasing the amount of grass harvest with exclosure age could support to increase easily decomposable organic inputs to the soil and improve soil properties in relatively short period of time.

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Section: Sitescontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Sitesmentioning

confidence: 99%

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Soil Restoration after seven Years of Exclosure Management in Northwestern Ethiopia

Mekuria

Langan

Noble³

et al. 2016

Land Degrad Dev

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“…Restoration of sandy land is critical for the development of local economy and ecology. During the process of sandy land restoration from mobile dune to sandy grassland, soil physical and chemical properties vary greatly (Li et al, 2006;Chen et al, 2012), which also is true for vegetation characteristics such as vegetation cover, species richness etc. (Zuo et al, 2012a).…”

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confidence: 99%

Artificial root exudates and soil organic carbon mineralization in a degraded sandy grassland in northern China

et al. 2014

Self Cite

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Plant root exudates contain various organic and inorganic components that include glucose, citric and oxalic acid. These components affect rhizosphere microbial and microfaunal activities, but the mechanisms are not fully known. Studies concerned from degraded grassland ecosystems with low soil carbon (C) contents are rare, in spite of the global distribution of grasslands in need of restoration. All these have a high potential for carbon sequestration, with a reduced carbon content due to overutilization. An exudate component that rapidly decomposes will increase soil respiration and CO 2 emission, while a component that reduces decomposition of native soil carbon can reduce CO 2 emission and actually help sequestering carbon in soil. Therefore, to investigate root exudate effects on rhizosphere activity, citric acid, glucose and oxalic acid (0.6 g C/kg dry soil) were added to soils from three biotopes (grassland, fixed dune and mobile dune) located in Naiman, Horqin Sandy Land, Inner Mongolia, China) and subjected to a 24-day incubation experiment together with a control. The soils were also analyzed for general soil properties. The results show that total respiration without exudate addition was highest in grassland soil, intermediate in fixed dune and lowest in mobile dune soil. However, the proportion of native soil carbon mineralized was highest in mobile dune soil, reflecting the low C/N ratio found there. The exudate effects on CO 2-C emissions and other variables differed somewhat between biotopes, but total respiration (including that from the added substrates) was significantly increased in all combinations compared with the control, except for oxalic acid addition to mobile dune soil, which reduced CO 2-C emissions from native soil carbon. A small but statistically significant increase in pH by the exudate additions in grassland and fixed dune soil was observed, but there was a major decrease from acid additions to mobile dune soil. In contrast, electrical conductivity decreased in grassland and fixed dune soil and increased in mobile dune. Thus, discrete components of root exudates affected soil environmental conditions differently, and responses to root exudates in soils with low carbon contents can differ from those in normal soils. The results indicate a potential for, e.g., acid root exudates to decrease decomposition rate of soil organic matter in low carbon soils, which is of interest for both soil restoration and carbon sequestration.

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“…Thus, changes in the total SOC contents due to the agricultural management occur slowly due to the high background C in soil (Blair et al, 1995). However, labile fractions tend to respond faster to the crop management changes and by driving crucial soil processes, such as nutrient cycling and biological activity, these fractions can significantly influence the quality of an agricultural land (Chen et al, 2012;Duval et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Role of Crop Rotations in the Dynamic of Soil Organic Matter Pools

Moreira¹,

Chiba²,

Maria³

et al. 2018

JAS

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Soil organic matter is considered a key attribute for a sustainable agricultural production and is influenced by the quantity and quality of the crop residue deposited on the soil surface. Therefore, different crop rotations could change the soil organic matter pools. The objectives of this study were to evaluate the soil carbon pools obtained by chemical and physical fractionation methods and the humification index under different crop rotations in a no-till system. We test the following hypothesis: a) the distribution of C and N among the soil organic matter fractions depends on plant species rotation schemes and; b) labile fractions are more sensitive to the input of crop residues and therefore, more suitable for evaluating the impact of different crop rotations in the soil organic matter quality. We evaluated four crop sequences (corn/corn/corn; corn/wheat/corn; soybean/wheat/corn and soybean/corn/corn) in a no-till system. A five-year reforested area was used as reference. We determined the total C and N contents, the mineral-associated C and N, the light fraction of C and N, the labile carbon extracted with KMnO 4 and the soil organic matter humification index. We found narrow differences between the crop rotation systems in the total C and N levels, the mineral-associated C and N fractions and the labile C extracted with KMnO 4 . The diversification of the agricultural system with soybean in crop rotation favored the accumulation of light fraction C and N in the soil that were more efficient to provide information about the changes in the soil organic matter quality.

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Carbon sequestration in the total and light fraction soil organic matter along a chronosequence in grazing exclosures in a semiarid degraded sandy site in China

Cited by 11 publications

References 29 publications

Soil Restoration after seven Years of Exclosure Management in Northwestern Ethiopia

Soil Restoration after seven Years of Exclosure Management in Northwestern Ethiopia

Artificial root exudates and soil organic carbon mineralization in a degraded sandy grassland in northern China

Role of Crop Rotations in the Dynamic of Soil Organic Matter Pools

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