Tillage frequency affects microbial metabolic activity and short-term changes in CO2 fluxes within 1 week in karst ecosystems

Xiao, Dan; Ye, Yingying; Xiao, Shuangshuang; Zhang, Wei; He, Xingyuan; Liu, Na; Xu, Zhihong; Wang, Kelin

doi:10.1007/s11368-019-02396-2

Cited by 5 publications

(2 citation statements)

References 73 publications

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“…At different soil depths, δ 13 C values at the oasis farmlands with 6-a and 10-a reclamation year were significantly positive compared to other oasis farmlands (Fig. 3); this finding may have been related to the improvements in microbial activity and fecundity caused by soil environmental changes that occur during the tillage process, as these improvements are conducive to the degradation of refractory substances in crops (Wynn et al, 2006;Brunn et al, 2014;Xiao et al, 2019;Sokol et al, 2022). However, δ 13 C showed a significant negative tendency at the oasis farmlands with 18-a and 30-a reclamation year (Fig.…”

Section: Effect Of Oasification On Soil δ 13 C and β Valuementioning

confidence: 93%

Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land

2023

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Soil organic carbon (SOC) and its stable isotope composition reflect key information about the carbon cycle in ecosystems. Studies of carbon fractions in oasis continuous cotton-cropped fields can elucidate the SOC stability mechanism under the action of the human-land relationship during the oasification of arid land, which is critical for understanding the carbon dynamics of terrestrial ecosystems in arid lands under global climate change. In this study, we investigated the Alar Reclamation Area on the northern edge of the Tarim Basin, Xinjiang Uygur Autonomous Region of China, in 2020. In original desert and oasis farmlands with different reclamation years, including 6, 10, 18, and 30 a, and different soil depths (0-20, 20-40, 40-60 cm), we analyzed the variations in SOC, very liable carbon (CVL), liable carbon (CL), less liable carbon (CLL), and non-liable carbon (CNL) using the method of spatial series. The differences in the stable carbon isotope ratio (δ 13 C) and beta (β) values reflecting the organic carbon decomposition rate were also determined during oasification. Through redundancy analysis, we derived and discussed the relationships among SOC, carbon fractions, δ 13 C, and other soil physicochemical properties, such as the soil water content (SWC), bulk density (BD), pH, total salt (TS), total nitrogen (TN), available phosphorus (AP), and available potassium (AK). The results showed that there were significant differences in SOC and carbon fractions of oasis farmlands with different reclamation years, and the highest SOC was observed at the oasis farmland with 30-a reclamation year. CVL, CL, CLL, and CNL showed significant changes among oasis farmlands with different reclamation years, and CVL had the largest variation range (0.40-4.92 g/kg) and accounted for the largest proportion in the organic carbon pool. The proportion of CNL in the organic carbon pool of the topsoil (0-20 cm) gradually increased. δ 13 C varied from -25.61‰ to -22.58‰, with the topsoil showing the most positive value at the oasis farmland with 10-a reclamation year; while the β value was the lowest at the oasis farmland with 6-a reclamation year and then increased significantly. Based on the redundancy analysis results, the soil physicochemical properties, such as TN, AP, AK, and pH, were significantly correlated with CL, and TN and AP were positively correlated with CVL. However, δ 13 C was not significantly influenced by soil physicochemical properties. Our analysis advances the understanding of SOC dynamics during oasification, revealing the risk of soil carbon loss and its contribution to terrestrial carbon accumulation in arid lands, which could be useful for the sustainable development of regional carbon resources and ecological protection in arid ecosystem.

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Section: Effect Of Oasification On Soil δ 13 C and β Valuementioning

confidence: 93%

Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land

2023

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“…This may indicate that tillage managements exerted larger influence on microbial metabolic activity in large size macroaggregates. Xiao et al [32] reported that tillage disturbance increases microbial metabolic activity and increased MBC content. This may be caused by the releasing of POC in macroaggregates.…”

Section: Effects Of Tillage On Soil Organic Carbon and Labile Carbon Fractionsmentioning

confidence: 99%

Dynamics of Soil Organic Carbon and Labile Carbon Fractions in Soil Aggregates Affected by Different Tillage Managements

et al. 2021

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Our study aimed to provide a scientific basis for an appropriate tillage management of wheat-maize rotation system, which is beneficial to the sustainable development of agriculture in the fluvo-aquic soil areas in China. Four tillage treatments were investigated after maize harvest, including rotary tillage with straw returning (RT), deep ploughing with straw returning (DP), subsoiling with straw returning (SS), and no tillage with straw mulching (NT). We evaluated soil organic carbon (SOC), dissolved organic carbon (DOC), permanganate oxidizable carbon (POXC), microbial biomass carbon (MBC), and particulate organic carbon (POC) in bulk soil and soil aggregates with five particle sizes (>5 mm, 5–2 mm, 2–1 mm, 1–0.25 mm, and <0.25 mm) under different tillage managements. Results showed that compared with RT treatment, NT treatment not only increased soil aggregate stability, but also enhanced SOC, DOC, and POC contents, especially those in large size macroaggregates. DP treatment also showed positive effects on soil aggregate stability and labile carbon fractions (DOC and POXC). Consequently, we suggest that no tillage or deep ploughing, rather than rotary tillage, could be better tillage management considering carbon storage. Meanwhile, we implied that mass fractal dimension (Dm) and POXC could be effective indicators of soil quality, as affected by tillage managements.

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Lithologic control of soil C:N:P stoichiometry across a climatic gradient in southwest China

et al. 2023

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Tillage frequency affects microbial metabolic activity and short-term changes in CO2 fluxes within 1 week in karst ecosystems

Cited by 5 publications

References 73 publications

Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land

Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land

Dynamics of Soil Organic Carbon and Labile Carbon Fractions in Soil Aggregates Affected by Different Tillage Managements

Lithologic control of soil C:N:P stoichiometry across a climatic gradient in southwest China

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