Dynamics of soil labile organic carbon fractions and C-cycle enzyme activities under straw mulch in Chengdu Plain

Li, Sen; Zhang, Shirong; Pu, Yulin; Li, Ting; Xu, Xiaoxun; Jia, Yongxia; Deng, Ouping; Gong, Guoshu

doi:10.1016/j.still.2015.07.019

Cited by 136 publications

(71 citation statements)

References 57 publications

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“…Our study showed that the SOC concentration in the soil was significantly correlated with all of the labile carbon fractions and enzymatic activities, which has been observed in other studies (Xu et al, 2015;Li et al, 2016) and indicates that the labile organic carbon and C-cycle-related enzymatic activities were sensitive to SOC variations. Thinning reduced the SOC concentrations except for in October, which was partially consistent with our hypothesis, and the thinning effect was more pronounced in the upper soil layer than in the lower.…”

Section: Soil Organic Carbonsupporting

confidence: 88%

“…Similar results were also observed in the New Jersey Pine Barrens, where the cellulase and phenol oxidase activities decreased significantly after 1 year of thinning (Geng et al, 2012). Variations in the activities of the enzymes that degrade major soil organic matter components have been linked to shifts in decomposition rates and soil carbon storage, and the observed differences may indicate a reduction in the decomposition rates of soil organic matter and carbon cycling between the organic matter pools in the thinned sites (Xu et al, 2015;Li et al, 2016). One year fine root turnover experiments with litter bags at the same sites at the same time confirmed that the low and high intensity thinning significantly decreased fine root decomposition rates by 21% and 9%, respectively (Wang, 2013).…”

Section: Soil Enzyme Activitiessupporting

confidence: 68%

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Soil labile organic carbon and carbon-cycle enzyme activities under different thinning intensities in Chinese fir plantations

Chen

Wang

et al. 2016

Applied Soil Ecology

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Section: Soil Organic Carbonsupporting

confidence: 88%

Section: Soil Enzyme Activitiessupporting

confidence: 68%

Soil labile organic carbon and carbon-cycle enzyme activities under different thinning intensities in Chinese fir plantations

Chen

Wang

et al. 2016

Applied Soil Ecology

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“…Though POXC did not significantly differ among treatments at our study site, reduced-or no-tillage and/ or residue retention have been found to increase POXC in temperate and tropical agroecosystems (Awale et al 2013;Carbonell-Bojollo et al 2015;Culman et al 2012;López-Garrido et al 2014;Plaza-Bonilla et al 2014), even without increases in total SOC (e.g., Melero et al 2009). The positive correlation of POXC and C-cycling enzyme activities may reflect decomposition of OM by enzymes (Li et al 2016). POXC has been found to positively associate with C and N mineralization, microbial biomass (Culman et al 2012;Wade et al 2016), and maize and vegetable yields across a diversity of soils and climates (Culman et al 2013;Hurisso et al 2016).…”

Section: Poxc Response To Tillage and Residue Managementmentioning

confidence: 99%

Biochemical proxies indicate differences in soil C cycling induced by long-term tillage and residue management in a tropical agroecosystem

et al. 2017

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Background & aim A potential benefit of conservation agriculture (CA) is soil organic carbon (SOC) accrual, yet recent studies indicate limited or no i m p a c t o f C A o n t o t a l S O C i n tr o p i c a l agroecosystems. We evaluated biochemical indicators of soil C cycling after 9 years (18 seasons) of contrasting tillage with and without maize residue retention in western Kenya. Methods Potential activities of C-cycling enzymes (β-glucosidase, GLU; β-galactosidase, GAL; glucosaminidase, GLM; cellobiohydrolase, CEL), permanganate-oxidizable C (POXC), and soil organic matter (SOM) composition (by infrared spectroscopy) were measured.Results POXC tended to be greater under reduced tillage and residue retention, but did not significantly differ among treatments (≤ 2% of SOC). Despite no significant differences in SOC concentrations or stocks, activities of all 4 C-cycling enzymes responded strongly to tillage, and to a lesser extent to residue management. Activities of GLU, GAL, and GLM were greatest under the combination of reduced tillage and residue retention relative to other treatments. Reduced tillage produced an enrichment in carboxyl C = O (+6%) and decreased polysaccharide C-O (−3.5%) relative to conventional tillage irrespective of residue management. Conclusions Though enzyme activities and POXC are typically associated with SOC accrual, changes in soil C cycling at this site have not translated into significant differences in SOC after 9 years. Elevated enzyme activities may have offset potential SOC accumulation under CA. However, the ratio of C-cycling enzyme activities to SOC was higher under reduced tillage and residue retention relative to other treatments, indicating that stoichiometric scaling of SOC and enzyme activities does not explain absence of significant differences in SOC among tillage and residue managements. Potential factors that may explain the low SOC accrual rates in this tropical agroecosystem included the low, albeit realistic, levels of residue retention, nutrient limitations, and high temperatures favoring decomposition.

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“…Due to the large storage, small changes in SOC can greatly alter the CO 2 concentration of the atmosphere and result in global climate change (Ajami, Heidari, Khormali, Gorji, & Ayoubi, ; Fontaine et al, ; Li et al, ; Zhang, Dang, Zhang, & Cheng, ). Meanwhile, SOC change can be used as an indicator to evaluate variation in soil quality because SOC is tightly associated with the biogeochemical cycles of most major nutrients and provides energy and substrates for microbial activities (Li et al, ; Stevenson, Sarmah, Smernik, Hunter, & Fraser, ). A high SOC content can significantly improve soil quality and represents a substantial contribution via carbon sequestration that can reduce carbon emissions (Hati, Swarup, Dwivedi, Misra, & Bandyopadhyay, ; Lal, ).…”

Section: Introductionmentioning

confidence: 99%

“…With the rapid development of the economy and the rapid urbanization of the Chengdu megacity, many agricultural lands with rice–wheat/rapeseed rotation were began to utilize rice–vegetable rotations and afforested land to provide the vegetables and ornamental trees required for urban construction and development. Although recent studies have analysed the effects of straw mulch on changes in soil LOC in fields with traditional rice–wheat/rapeseed rotation in this region (Li et al, ; Tian, Lu, Fan, Li, & Kuzyakov, ), few studies have focussed on the effects of transformations of agricultural land use scenarios on the levels and distributions of TOC and its labile fractions throughout the soil profile. In this study, we used the method of space‐for‐time substitution to assess the effects of agricultural land use change on TOC and its labile fractions in the urban agricultural area of the Chengdu Plain.…”

Section: Introductionmentioning

confidence: 99%

Effects of agricultural land use change on organic carbon and its labile fractions in the soil profile in an urban agricultural area

Luo

Shen

et al. 2019

Land Degrad Dev

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The properties of soil organic carbon (SOC) required for carbon sequestration and nutrient availability are contradictory, and the changes in SOC caused by agricultural land use changes remain elusive. Data on the total soil organic carbon (TOC) and labile organic carbon, including easily oxidizable organic carbon (EOC), dissolved organic carbon (DOC), and microbial biomass carbon (MBC), of the soil profile were analysed for four typical agricultural land use scenarios in the Chengdu Plain, China. The impacts of agricultural land use changes on sequestration and nutrient availability of SOC were assessed in this urban agricultural area using the space‐for‐time substitution method. Conversion of land use from a traditional agricultural rotation (rice‐wheat/rapeseed rotation) to afforestation increased the MBC content and decreased the contents of EOC, DOC, and TOC due to the lower input of organic matter, improved aeration of the soil profile, and growth of aboveground biomass. Conversion of a traditional rotation to a rice–garlic rotation resulted in a significant increase in topsoil TOC, slight but insignificant decreases in subsoil TOC, and clear increases in labile organic carbon because of rice planting, rice straw mulch, and reasonable application of chemical fertilizers. In contrast, the conversion of a traditional rotation to a rice–leafy vegetable rotation decreased MBC due to the excessive use of chemical fertilizers that consequently increased EOC, DOC, and TOC. We conclude that afforestation on paddy soil has negative consequences for soil carbon sequestration and a rice–leafy vegetable rotation contributes to carbon sequestration but is detrimental to soil fertility. In addition, the MBC ratio in soil could be the optimal indicator for assessing SOC stability and soil fertility, and more attention should be paid to subsoil carbon changes.

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Dynamics of soil labile organic carbon fractions and C-cycle enzyme activities under straw mulch in Chengdu Plain

Cited by 136 publications

References 57 publications

Soil labile organic carbon and carbon-cycle enzyme activities under different thinning intensities in Chinese fir plantations

Soil labile organic carbon and carbon-cycle enzyme activities under different thinning intensities in Chinese fir plantations

Biochemical proxies indicate differences in soil C cycling induced by long-term tillage and residue management in a tropical agroecosystem

Effects of agricultural land use change on organic carbon and its labile fractions in the soil profile in an urban agricultural area

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