Effects of biotic and abiotic factors on soil organic carbon in semi-arid grassland

Tian, Fei; Zhang, Zhinan; Chang, Xiaofeng; Sun, Liqin; Wei, Xuehong; Wu, Gao‐Lin

doi:10.4067/s0718-95162016005000080

Cited by 14 publications

(12 citation statements)

References 29 publications

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“…Ultimately it seriously decreases food production. Drought is one of the major abiotic stress which causes low yield especially in arid and semi-arid regions of the world (Viscardi et al, 2016;Tian et al, 2016). Due to the climate change, severe droughts are expected in future.…”

Section: Introductionmentioning

confidence: 99%

Screening of sunflower (Helianthus annus L.) accessions under drought stress conditions, an experimental assay

Razzaq

Tahir

Sadaqat

et al. 2017

J. Soil Sci. Plant Nutr.

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Drought is the major abiotic stress that limits the crop production at drastic level. Screening of tolerant accessions from available germplasm is the basic step in plant breeding. Sunflower is becoming popular and major oilseed crop in world but unfortunately it is drought sensitive. Screening in field has uncertainties due to the uncontrolled conditions, interaction of biotic and abiotic stresses and variability in environmental factors. Response of the sixty sunflower accessions to drought stress at germination and seedling stage was examined by using polyethylene glycol (PEG-6000) as drought simulator under laboratory. Normal and drought stress treatments i.e. T 1 = zero (control), T 2 =-1.33 MPa and T 3 =-1.62 MPa were developed by dissolving 0, 15 g and 20 g Polyethylene Glycol (PEG-6000) in 100 mL distilled water and a completely randomized design with three replications were used. Promptness, germination, seedling height, fresh weight, dry weight and stress indexes were determined to evaluate the response of sunflower accessions under normal and PEG simulated drought stress treatments. Principal component analysis was used to select the drought tolerant and sensitive accessions. The accessions 017583, A-75, A-79, 017592, G-33, A-48, A-23, G-61, HBRS-1 and 017566 were selected as drought tolerant while, CM-621, 017577, HA-124, HA-133, HA-342 and HA-341 were as drought sensitive. This study may be helpful for the comparison of drought indexes in a controlled experimental assay and for the identification of drought tolerant sunflower cultivars to be used in further breeding programs.

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Section: Introductionmentioning

confidence: 99%

Screening of sunflower (Helianthus annus L.) accessions under drought stress conditions, an experimental assay

Razzaq

Tahir

Sadaqat

et al. 2017

J. Soil Sci. Plant Nutr.

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“…We hope that this information will be used by the decision-makers to promote the conservation of these ecosystems. Globally, better estimates of carbon stocks and dynamics are needed for improved understanding of the carbon balance and potential for climate change mitigation (Scharlemann et al, 2014), ecosystem services provided (Oso and Rajashekhar, 2017) and the relationship with other systems (Tian et al, 2016). Data on C accumulation in South American peatlands are scarce, therefore our results are useful for a complete picture of the global C cycle.…”

Section: Discussionmentioning

confidence: 98%

Update of recent rates of carbon accumulation in bogs of Northern Patagonia-Chile

León

Benítez-Mora

Oliván

2018

J. Soil Sci. Plant Nutr.

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Peatlands are one of the most important carbon cycle regulatory ecosystems, and are influenced by global climate change. However, studies of this kind of wetland are scarce in southern South America. In this study we performed a detailed analysis of recent accumulation rates of carbon (RERCA) in two types of Sphagnum peatland in Isla Grande de Chiloé (Chile) (42°-43°S and 75°-73°W). Monoliths of peat in continuous depths were analyzed and assigned ages using 210 Pb dating. The results showed a difference between the two types of peatland; the average rate for the anthropogenic peatland (107.34 ±113.9 g C m-2 yr-1) was superior to that of the natural peatland (78.33±77.1 g C m-2 yr-1). The surface profiles (30 cm) clearly revealed the recent rate of carbon accumulation for the past 100 years in Sphagnum peatlands of Northern Patagonia. The rate for the natural peatland is within the range found for ombrotrophic peatlands in the Northern Hemisphere. However, the rate estimated for the anthropogenic peatland was significantly greater than those reported in other parts of the world. Our results provide evidence of the importance of these unique ecosystems in the carbon accumulation process.

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“…Our results were therefore similar to a study showing that high R and increasing number of plants significantly improve organic C inputs (Sousa et al, ). Taken together, communities with high species diversity in arid areas tend to have more vegetation biomass (Tian et al, ). A large amount of litter on the soil surface and root biomass provide a suitable living environment for numerous soil bacteria, microbes, and enzymes, which in turn promotes the cycling of SOM (Paterson et al, ).…”

Section: Discussionmentioning

confidence: 99%

Vertical Distributions of Soil Organic Carbon and its Influencing Factors Under Different Land Use Types in the Desert Riparian Zone of Downstream Heihe River Basin, China

et al. 2018

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The amount of soil organic carbon (SOC) reflects the ability of ecosystem to sequester carbon (C). In the desert riparian zone of Heihe River basin, northwest China, that has been the subject of an ecological water conveyance since 2000, studies on SOC under different land use types remain scarce. Yet analyzing soil organic carbon content (SOCC) and its spatial distribution in the area is a key component when studying C cycle in this desert ecosystem. We therefore investigated the vertical distribution of SOC and its influencing factors using field study, and we found significant differences among different land use types and soil depths. The average SOCC and soil organic carbon density in the 0–100 cm soil layers were 23.31 g kg−1 and 6.08 kg m−2, respectively. SOCC and soil organic carbon density decreased in the following order: grassland (5.73 g kg−1) > forestland (5.03 g kg−1) > shrubland (4.79 g kg−1) > cropland (4.28 g kg−1) > Gobi desert (2.10 g kg−1). We also found that vegetation and soil properties jointly affected SOCC in this riparian arid zone, in addition to human disturbance, as indicated by a low stratification ratio in the grassland (1.575) and cropland (1.366). When natural vegetation was transformed into cropland, SOCC decreased with the removal of plant biomass and the increase of wind erosion. Consequently, conservation agricultural practices that consider preservation of soil organic matter (e.g., no‐tillage and intercropping with deep‐rooted leguminous perennial plants) should be introduced in order to prevent further degradation.

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Effects of biotic and abiotic factors on soil organic carbon in semi-arid grassland

Cited by 14 publications

References 29 publications

Screening of sunflower (Helianthus annus L.) accessions under drought stress conditions, an experimental assay

Screening of sunflower (Helianthus annus L.) accessions under drought stress conditions, an experimental assay

Update of recent rates of carbon accumulation in bogs of Northern Patagonia-Chile

Vertical Distributions of Soil Organic Carbon and its Influencing Factors Under Different Land Use Types in the Desert Riparian Zone of Downstream Heihe River Basin, China

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