Soil organic C and total N as well as microbial biomass C and N affect aggregate stability in a chronosequence of Chinese fir plantations

Mei, Ling; Tang, Lili; Ye, Shaoming; Wang, Shengqiang

doi:10.1016/j.ejsobi.2021.103347

Cited by 28 publications

(16 citation statements)

References 44 publications

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“…Microbes are one of the vital biological parts of soils ( Song et al, 2020 ); meanwhile, they can provide more important information involved in variations in soil microenvironment than physicochemical characteristics ( Blagodatskaya and Kuzyakov, 2013 ; Escalas et al, 2019 ). Our findings demonstrated that successive walnut planting was beneficial for microbial growth (as indicated by the contents of total PLFAs) in the 0–40 cm soil layers ( Figure 2 ), which were confirmed by the findings of the other studies that long-term Chinese fir plantations (26-year) and citrus orchard plantations (40-year) also promoted microbial growth in Guangxi and Jiangxi Province, China, respectively ( Mao et al, 2021 ; Zheng et al, 2022 ). The likely reasons were that the orchard soils contained more ‘food’ (e.g., C and nutrients; Table 1 ; Supplementary Table S1 ) and showed better ‘microsites’ (e.g., high soil porosity; Supplementary Table S3 ) due to the continuous organic inputs (e.g., organic fertilizers and crop residues, etc.…”

Section: Discussionsupporting

confidence: 89%

Successive walnut plantations alter soil carbon quantity and quality by modifying microbial communities and enzyme activities

et al. 2022

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Knowledge of the spatial–temporal variations of soil organic carbon (SOC) quantity and quality and its microbial regulation mechanisms is essential for long-term SOC sequestration in agroecosystems; nevertheless, this information is lacking in the process of walnut plantations. Here, we used the modified Walkley-Black method, phospholipid fatty acid analysis, and micro-plate enzyme technique to analyze the evolution of SOC stocks and quality/lability as well as microbial communities and enzyme activities at different soil depths in walnut plantations with a chronosequence of 0-, 7-, 14-, and 21-years in the Eastern Taihang Mountains, China. The results indicated that long-term walnut plantations (14-and 21-years) enhanced SOC stocks, improved SOC quality/lability (as indicated by the lability index), and promoted microbial growth and activities (i.e., hydrolase and oxidase activities) in the 0–40 cm soil layers. Besides, these above-mentioned SOC-and microbial-related indices (except for oxidase activities) decreased with increasing soil depths, while oxidase activities were higher in deeper soils (40–60 cm) than in other soils (0–40 cm). The partial least squares path model also revealed that walnut plantation ages and soil depths had positive and negative effects on microbial attributes (e.g., enzyme activities, fungal and bacterial communities), respectively. Meanwhile, the SOC stocks were closely related to the fungal community; meanwhile, the bacterial community affected SOC quality/liability by regulating enzyme activities. Comprehensively, long-term walnut plantations were conducive to increasing SOC stocks and quality through altering microbial communities and activities in the East Taihang Mountains in Hebei, China.

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Section: Discussionsupporting

confidence: 89%

Successive walnut plantations alter soil carbon quantity and quality by modifying microbial communities and enzyme activities

et al. 2022

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“…Regardless of the stand type, there were significant differences in OC and TN contents associated with different aggregate sizes, which is shown in Table 2. In this research, OC and TN contents were mainly concentrated in microaggregates (Figure 3), conforming to the results by Mao et al (2021) and Tang and Wang (2022) that microaggregates have larger specific surface areas, causing the adsorption to nutrients to improve. Similarly, our findings detected that soil OC and TN contents with sized aggregates displayed a similar distribution pattern (Figure 4).…”

Section: Aggregate-associated Oc Tn and Tp Contentssupporting

confidence: 89%

“…Likewise, soil aggregate stability exhibited a markedly positive correlation with soil TN and TP contents, TP stocks and C/N ratio (Figure 8). Soil C/N ratio (0-20 cm depth) and TN content (20-40 cm depth) are the mainly key factors of the variation in soil aggregate stability of the three stands, but such result was different from Mao et al (2021) finding that the contents of OC and TN can markedly influence on soil aggregate stability during the successive planting of Chinese fir. Such results might be attributed to the higher soil C/N ratio, which could reduce the degree of humification to increase the retention of OM.…”

Section: Soil Aggregate Stability As Influenced By Ecological Stoichi...contrasting

confidence: 67%

Variations in soil aggregate stability and aggregate-associated C-N-P stoichiometry by stand type in Chinese fir

Zhang

Jiang

et al. 2022

Preprint

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Research on the variations in soil aggregate stability and ecological stoichiometry at aggregate scales by stand type is of great significance to investigating the distribution, limitation, balance, and cycling of chemical elements. We measured the variations in soil aggregate stability, organic carbon (OC), total nitrogen (TN), and total phosphorus (TP) contents and stocks, in addition to their stoichiometric ratios by stand type (mixed stands of Chinese fir and Mytilaria laosensis and Chinese fir and Michelia macclurei and pure stand of Chinese fir), and aggregate size (<0.25, 0.25-1, 1-2, and >2 mm) in soil profile (0-20 and 20-40 cm) in Guangxi, China. Soil OC and TN contents and C/N, C/P and N/P ratios were more distributed in aggregates of <0.25 mm in the three stands; in contrast, soil OC, TN, and TP stocks were more obvious in aggregates of >2 mm. In comparison to the pure stand, the mixed stands showed significantly higher levels of soil aggregate stability, aggregate-associated OC and TN contents with stocks, TP content, C/N and C/P ratios. The C/N ratio, TN and TP contents, and TP stocks were the key factors in the stand types affecting the stability of soil aggregate changes. Hence, constructing mixed stands and applying appropriate amounts of N and P fertilization can improve soil fertility and promote degraded soil restoration.

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“…As we know, the soil C/N ratio can effectively indicate soil OM availability, and the decreasing soil C/N ratio is coupled with increasing soil OM availability (Ostrowska & Porębska, 2015). According to our previous studies (Mao et al, 2021), soil C/N ratio decreased as aggregate size increased in CFPs of various ages, and the coarse macro-aggregates presented the lowest soil C/N ratio, which showed that soil OMs in coarse macro-aggregates were younger and more unstable relative to those in other aggregates. Namely, the coarse macro-aggregates contained OMs that presented the highest availability.…”

Section: Resultsmentioning

confidence: 95%

“…Meanwhile, Rongshui County served as the primary producing region of Chinese fir in Guangxi. Information on this experiment location was detailed in our previous research (Mao et al, 2021). Climate is mostly subtropic monsoon climate, the annual average precipitation is 1824.8 mm and the annual average temperature is 18.8 C. Hills and low mountains constitute the landform, the gradient is 18-23 and the elevation is 500-900 m.…”

Section: Experiments Locationmentioning

confidence: 99%

Stoichiometric characteristics of medium‐ and micro‐elements (Ca, Mg, Fe, and Mn) in soil aggregates as affected by stand age in Chinese fir plantations

et al. 2022

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In order to understand the fertility of soil comprehensively in Chinese fir plantations, the stoichiometric characteristics of soil nutrient elements should be paid more attention to. Despite the broad investigation of the stoichiometry regarding soil C, N, P, and K, the stoichiometry regarding soil Ca, Mg, Fe, and Mn remains unclear.Therefore, this research aimed at exploring how the medium-and micro-element (Ca 2+ , Mg 2+ , Fe 2+ , and Mn 2+ ) contents, stocks, and their stoichiometric ratios (Ca 2+ / Mg 2+ and Fe 2+ /Mn 2+ ) in soil aggregates varied with Chinese fir-planting age (3, 9, 17, and 26 years) in the soil profile (0-40 cm). Our results showed that the stand age affected the stoichiometric characteristics of soil medium-and micro-elements in Chinese fir plantations, but such effects at the soil depth of 0-30 cm were more obvious compared with those at the 30-40 cm. At the soil depth of 0-30 cm, soil Fe 2+ and Mn 2+ were gradually accumulated over time, whereas soil Ca 2+ and Mg 2+ were susceptible to leaching and fir up taking. In the process of Chinese fir planting, decreasing soil Ca 2+ and Mg 2+ , especially the Ca 2+ (as demonstrated by decreasing soil Ca 2+ /Mg 2+ ratio), could cause soil acidification. And then, soil acidification could lead to more Fe 2+ and Mn 2+ released by accelerated mineral collapse, especially the Fe 2+ (as demonstrated by increasing soil Fe 2+ /Mn 2+ ratio). Overall, the present research advances knowledge of soil nutrient dynamics in Chinese fir plantations and provides supplementary information for the ecological stoichiometry of soil in the terrestrial ecosystem elsewhere in the world.

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Soil organic C and total N as well as microbial biomass C and N affect aggregate stability in a chronosequence of Chinese fir plantations

Cited by 28 publications

References 44 publications

Successive walnut plantations alter soil carbon quantity and quality by modifying microbial communities and enzyme activities

Successive walnut plantations alter soil carbon quantity and quality by modifying microbial communities and enzyme activities

Variations in soil aggregate stability and aggregate-associated C-N-P stoichiometry by stand type in Chinese fir

Stoichiometric characteristics of medium‐ and micro‐elements (Ca, Mg, Fe, and Mn) in soil aggregates as affected by stand age in Chinese fir plantations

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