Frequency of stover mulching but not amount regulates the decomposition pathways of soil micro-foodwebs in a no-tillage system

Kou, Xinchang; Ma, Ning; Zhang, Xiaoke; Xie, Hongfeng; Zhang, Xudong; Wu, Zhiyong; Liang, Wenju; Li, Qi; Ferris, H.

doi:10.1016/j.soilbio.2020.107789

Cited by 37 publications

(27 citation statements)

References 67 publications

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“…Nuestro estudio no muestra patrones coincidentes entre las abundancias de hongos y nematodos fungívoros y entre bacterias y nematodos bacterívoros. En ocasiones, se ha encontrado que los nematodos bacterívoros pueden reducir las abundancias de las poblaciones de bacterias (Neilson et al 2020), aunque, si hay recursos abundantes, las abundancias de bacterias y hongos y de nematodos bacterívoros y fungívoros pueden aparecer positivamente relacionados (Kou et al 2020). En ecosistemas antárticos el calentamiento del clima produjo un desacople entre las abundancias de bacterias y los nematodos que se alimentan de ellas (Knox et al 2017).…”

Section: Discussionunclassified

Efecto de la deposición de N y P atmosférico en la microfauna edáfica de sistemas de alta montaña de la red de Parques Nacionales

Moreno

Iglesias²,

Usero

et al. 2021

ECOS

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Los impulsores de Cambio Global con mayor impacto en los ecosistemas de alta montaña son los cambios climático y de uso del suelo y la deposición de nitrógeno (N). En España, un factor adicional es la deposición de fósforo (P) proveniente del polvo sahariano. La deposición atmosférica de N y P puede tener un gran impacto en el ciclado de nutrientes y en la biota edáfica. Durante tres años hemos simulado deposición atmosférica de N y P en cuatro ecosistemas alpinos de la red de Parques Nacionales siguiendo un gradiente latitudinal de aridez y analizado sus efectos sobre las comunidades de nematodos, hongos y bacterias. La microbiota redujo su presencia con la aridez, pero solo los hongos respondieron a la deposición de N. La abundancia de nematodos también disminuyó con la aridez, y, mientras que la deposición de N aumentó su biomasa debido al incremento de la abundancia de nematodos bacterívoros, el P incrementó la contribución porcentual de bacterívoros y fungívoros simplificando las redes tróficas edáficas. Los nematodos fungívoros fueron más sensibles que los bacterívoros a los desbalances estequiométricos y, en general, las comunidades de sistemas áridos se caracterizaron por una prevalencia del canal bacterívoro de descomposición de la materia orgánica y una menor importancia de la herbivoría subterránea. El incremento de la aridez, la deposición de N atmosférico y potencial aumento de la deposición de P sahariano podrían tener efectos a largo plazo en la composición y funciones ecosistémicas de las redes tróficas edáficas de alta montaña.

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Section: Discussionunclassified

Efecto de la deposición de N y P atmosférico en la microfauna edáfica de sistemas de alta montaña de la red de Parques Nacionales

Moreno

Iglesias²,

Usero

et al. 2021

ECOS

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“…Bacterial and fungal channels are, respectively, considered fast and slow decomposition pathways with regard to rates of mineralization and nutrient turnover (Chen et al, 2015; de Vries & Caruso, 2016; Fabian et al, 2017). The amount of nutrient being regulated by N fertilization application coordinated the nutrient decomposition channels and enhanced the trophic connection between soil microbes and nematodes (Kou et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…We analyzed the correlations between soil properties and soil microbial and nematode biomass carbon using the ‘Corrplot’ function in R studio software (version 3.1.2). In order to determine the effects of the management practices on soil nematode food web associations, Spearman's rank correlation matrix based on biomass carbon data of microorganisms and nematodes were depicted graphically through network analysis using the CYTOSCAPE software, version 3.7.1 (Kou et al, 2020; Morriën et al, 2017; Shannon et al, 2003).…”

Section: Methodsmentioning

confidence: 99%

Exploring N fertilizer reduction and organic material addition practices: An examination of their alleviating effect on the nematode food web in cropland

et al. 2020

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Excessive nitrogen (N) fertilization in croplands results in environmental problems, such as soil quality deterioration, water contamination, and biodiversity losses, which threaten the sustainable development of soil ecosystems. The soil nematode food web plays key roles in soil organic matter decomposition and nutrient cycling, and thus the sustainable development of cropland ecosystems. However, how the negative impact from the excessive N fertilization on the nematode food web is effectively alleviated remains uncertain. This study aimed to explore the effects of different N fertilization management practices (N fertilizer reduction or organic material addition) on alleviating the negative effects on the nematode food web in croplands. Four treatments/ management practices were examined: conventional fertilization (N control), N fertilizer reduction of 100% (N 0), N fertilizer reduction of 50% (N 1), and conventional fertilization with organic material addition (N +S). The results showed that the abundance of nematodes and microbial phospholipid fatty acids (PLFAs) both increased in the treatments of N 0 , N 1 , and N +S compared with N. Besides, N +S also increased the nematodes' biomass, diversity, and metabolic footprint, which correspondingly strengthened the nutrient turnover through the nematode food web. Overall, two management practices 1)N fertilizer reduction and 2) organic material addition, differ in the abiotic or biotic process in alleviating the negative effects of N fertilization on the nematode food web. The reducing N fertilization can directly alleviate the negative effect of fertilizer on soil acidification and then benefit for the growth of microorganisms and nematodes. The exogenous carbon input from organic material addition might promote carbon flowing and immobilization into nematode food web, and ultimately enhance the stability of soil food web.

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“…Generally, bacteria always use easily available nutrient resources and generate rapid nutrient cycling in the soil, whereas fungi typically decompose more difficult nutrients with slower cycling ( Thakur and Geisen, 2019 ). Stover mulching significantly affected the composition and function of soil biological communities because of the C/N ratio of stover and the decomposition rate under different tillage management, thereby affecting the accumulation of soil nitrogen ( Li et al, 2018 ; Martínez-García et al, 2018 ; Kou et al, 2020 ). A study showed that the decomposition efficiency of the primary decomposers and the composition of soil biological communities were both affected by the amount and frequency of stover cover ( Kou et al, 2020 ; Wang et al, 2020a , b ).…”

Section: Introductionmentioning

confidence: 99%

“…Stover mulching significantly affected the composition and function of soil biological communities because of the C/N ratio of stover and the decomposition rate under different tillage management, thereby affecting the accumulation of soil nitrogen ( Li et al, 2018 ; Martínez-García et al, 2018 ; Kou et al, 2020 ). A study showed that the decomposition efficiency of the primary decomposers and the composition of soil biological communities were both affected by the amount and frequency of stover cover ( Kou et al, 2020 ; Wang et al, 2020a , b ). The proper amount of stover mulching can increase the number of bacteria, whereas excessive mulching could inhibit the function of the microbial community ( Zhang et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of frequency and amount of stover mulching on soil nitrogen and the microbial functional guilds of the endosphere and rhizosphere

Song

Wang

Hou³

2022

Front. Microbiol.

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Stover mulching as a conservation and sustainable agricultural practice is beneficial for maintaining soil nitrogen (N) requirements and plant health. The microbial functional guilds of the root and rhizosphere are important factors in the soil nitrogen cycle. However, it is unclear how the frequency and amount of stover mulching influence microbial functional guilds in the root and rhizosphere. Therefore, we investigated the responses of the microbial functional guilds in the endosphere and rhizosphere to maize stover mulching amounts (0, 1/3, 2/3, and total stover mulching every year) and frequencies (once every 3 years and twice every 3 years) under 10-year no-till management. The bacterial functional guilds of nitrogen fixation, nitrification, and anaerobic nitrate oxidation displayed the significantly correlation with C/N, total nitrogen, NO3−, and NH4+. The fungal functional guilds of plant pathogens and saprotrophs showed significantly correlations with C/N, total nitrogen, and NO3−. Moreover, we found that bacterial guilds play a pivotal role in maintaining N requirements at the jointing stage, whereas root endophytic fungal guilds play a more important role than bacterial guilds in regulating plant health at the mature stage. The frequency and amount of stover mulching had significant effects on the microbial functional guilds in the root and rhizosphere. Our data suggest that stover mulch application twice every 3 years is the optimal mulching frequency because it yielded the lowest abundance of nitrifying and anaerobic nitrate-oxidising bacteria and the highest abundance of nitrogen-fixing bacteria at the jointing stage, as well as the lowest abundance of fungal plant pathogens in roots at the mature stage.

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Frequency of stover mulching but not amount regulates the decomposition pathways of soil micro-foodwebs in a no-tillage system

Cited by 37 publications

References 67 publications

Efecto de la deposición de N y P atmosférico en la microfauna edáfica de sistemas de alta montaña de la red de Parques Nacionales

Efecto de la deposición de N y P atmosférico en la microfauna edáfica de sistemas de alta montaña de la red de Parques Nacionales

Exploring N fertilizer reduction and organic material addition practices: An examination of their alleviating effect on the nematode food web in cropland

Effects of frequency and amount of stover mulching on soil nitrogen and the microbial functional guilds of the endosphere and rhizosphere

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