Effects of 11 years of conservation tillage on soil organic matter fractions in wheat monoculture in Loess Plateau of China

Chen, Haiqing; Hou, Ruixing; Gong, Yafeng; Li, Hongwen; Fan, Mingsheng; Kuzyakov, Yakov

doi:10.1016/j.still.2009.09.009

Cited by 329 publications

(219 citation statements)

References 60 publications

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“…However, a few studies have shown that conservation tillage enhances soil carbon sequestration, but these reports have described changes in microbial biomass and diversity in northern China that account for approximately 56 % of the Chinese land area, only using indirect techniques (Chen et al 2009;Wang et al 2008). These results do not clearly and accurately demonstrate how conservation tillage alters the soil microbial community.…”

Section: Introductionmentioning

confidence: 99%

Conservation tillage increases soil bacterial diversity in the dryland of northern China

Wang

Lü

Chen

et al. 2016

Agron. Sustain. Dev.

124

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Agricultural practices change soil's physical and chemical properties, therefore modifying soil microbial communities. Conservation tillage is widely used to improve the soil texture and nutrient status in the dryland regions of northern China. However, little is known about the influence of soil properties on microbes, in particular on the effect of conservation tillage on soil bacterial communities. Here, we studied the effect of a 5-year tillage treatment on soil properties and soil bacterial communities in the dryland regions of northern China using a high-throughput sequencing technology and quantitative PCR of 16S rRNA genes. We compared the changes in soil bacterial diversity, and composition was measured for conservation tillage, including zero plow or chisel plow, and for conventional tillage using plow. Our results show that conservation tillage increased the Simpson index by 378 % and exhibited significantly dissimilar polygenetic diversity, with r of 1, and taxonomic diversity, of r higher than 0.49, compared to conventional tillage. This finding demonstrates that conservation tillage modifies soil bacterial diversity. Chisel plow and zero tillage increase the abundance of the genus Bacillus, including 85 % of the phylum Firmicutes, and of Rhizobiales belonging to the Alphaproteobacteria. Overall conservation tillage increased the abundance of profitable functional bacteria species.

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Section: Introductionmentioning

confidence: 99%

Conservation tillage increases soil bacterial diversity in the dryland of northern China

Wang

Lü

Chen

et al. 2016

Agron. Sustain. Dev.

124

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“…Owing to their refractory properties, humic substances play a crucial role in soil carbon sequestration (Swift 2001). Soil aggregate stability is an important indicator of soil physical quality (Chen et al 2009). Formation and stabilization of soil aggregates generally facilitates soil carbon sequestration and provides physical protection for soil carbon (Cheng et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau

Cao

Yong

et al. 2016

J. Mt. Sci.

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Alpine grassland soils on Qinghai-Tibet Plateau store approximately 33.5 Pg of organic carbon (C) at 0-0.75 m depth and play an important role in the global carbon cycle. We investigated soil organic C (SOC), water-soluble organic C (WSOC), easily oxidizable organic C (EOC), humic C fractions, aggregate-associated C, aggregate stability, and humic acid (HA) composition along an east-west transect across Qinghai-Tibet Plateau, and explored their spatial patterns and controlling factors. The contents of SOC, WSOC, EOC, humic C fractions and aggregate-associated C, the proportions of macroaggregates (2-0.25) and micro-aggregates (0.25-0.053 mm), and the aggregate stability indices all increased in the order alpine desert < alpine steppe < alpine meadow. The alkyl C, O-alkyl C, and aliphatic C/aromatic C ratio of HA increased as alpine desert < alpine meadow < alpine steppe, and the trends were reverse for the aromatic C and HB/HI ratio. Mean annual precipitation and aboveground biomass were significantly correlated with the contents of SOC and its fractions, the proportions of macro-and microaggregates, and the aggregate stability indices along this transect. Among all these C fractions, SOC content and aggregate stability were more closely associated with humic C and silt and clay sized C in comparison with WSOC, EOC, and macro-and microaggregate C. The results suggested that alpine meadow soils containing higher SOC exhibited high soil aggregation and aggregate stability. Mean annual precipitation should be the main climate factor controlling the spatial patterns of SOC, soil aggregation, and aggregate stability in this region. The resistant and stable C fractions rather than labile C fractions are the major determinant of SOC stocks and aggregate stability. Keywords

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“…Indeed, low carbon density in croplands is related closely to conventional tillage (Al-Kaisi and Yin 2005). Available studies have shown that conventional tillage decreased soil organic carbon stocks and various labile carbon fractions (Chen et al 2009), and caused alterations of soil enzyme activities in wheat fields of the Loess Plateau of China (Jin et al 2009a). As the major process controlling carbon loss from the soil, SCE has been investigated widely globally.…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of soil CO₂ efflux in a conventional tilled wheat field of the Loess Plateau, China

Zhang¹,

Zhou²,

Lü³

et al. 2011

Ecological Research

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An automated chamber system was employed to measure the soil CO 2 efflux (SCE) in situ for 2 years in a conventional wheat field of the Loess Plateau, China under semi-arid conditions. The annual mean SCE values were 2.44 ± 2.52 lmol m À2 s À1 in 2006 and 2.37 ± 2.33 lmol m À2 s À1 in 2007. Distinct seasonality in the SCE was observed, with significant differences occurring among four periods divided by harvesting, tillage and sowing. In the period from tillage to sowing, the mean SCE values were 2.82 and 2.69 times the annual mean values in 2006 and 2007, respectively, and SCE accounted for 39% and 48% of the annual total within 14% and 18% of the days of the years. Although there were significant exponential correlations between the SCE and soil temperature, and significant linear correlations between the SCE and soil moisture for measurements conducted in the periods before tillage and after sowing each year, the SCE from tillage to sowing was significantly beyond the correlation curves. These findings indicated that seasonal variation in the SCE in a conventional field was controlled not only by soil temperature and moisture, but also by tillage practice. The confounding effects of climate and practice on SCE should be considered when developing ways to mitigate soil carbon loss in conventional cropland in semi-arid regions.

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Effects of 11 years of conservation tillage on soil organic matter fractions in wheat monoculture in Loess Plateau of China

Cited by 329 publications

References 60 publications

Conservation tillage increases soil bacterial diversity in the dryland of northern China

Conservation tillage increases soil bacterial diversity in the dryland of northern China

Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau

Seasonal dynamics of soil CO₂ efflux in a conventional tilled wheat field of the Loess Plateau, China

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Effects of 11 years of conservation tillage on soil organic matter fractions in wheat monoculture in Loess Plateau of China

Cited by 329 publications

References 60 publications

Conservation tillage increases soil bacterial diversity in the dryland of northern China

Conservation tillage increases soil bacterial diversity in the dryland of northern China

Soil organic carbon contents, aggregate stability, and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau

Seasonal dynamics of soil CO2 efflux in a conventional tilled wheat field of the Loess Plateau, China

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Seasonal dynamics of soil CO₂ efflux in a conventional tilled wheat field of the Loess Plateau, China