Defoliation and neighbouring legume plants accelerate leaf and root litter decomposition of Leymus chinensis dominating grasslands

Song, Xuxin; Cai, Jinting; Meng, Hui-Xian; Ding, Shuaishuai; Liu, Bai; Chang, Qing; Zhao, Xuan; Li, Zhiqiang; Wang, Deli

doi:10.1016/j.agee.2020.107074

Cited by 6 publications

(4 citation statements)

References 49 publications

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“…First, legume litter with low C‐to‐N ratios would decompose faster than litter of forbs and grasses (Epihov et al., 2017; Milcu et al., 2008). Second, the increase in the proportion of legume litter could further accelerate the decomposition rate of the whole litter layer on the ground (Kohmann et al., 2018; Song et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

Plant functional types regulate non‐additive responses of soil respiration to 5‐year warming and nitrogen addition in a semi‐arid grassland

et al. 2021

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1. How climate warming interacts with atmospheric nitrogen (N) deposition to affect carbon (C) release from soils remains largely elusive, posing a major challenge in projecting climate change-terrestrial C feedback.2. As part of a 5-year (2006-2010) field manipulative experiment, this study was designed to examine the effects of 24-hr continuous warming and N addition on soil respiration and explore the underlying mechanisms in a semi-arid grassland on the Mongolian Plateau, China.3. Across the 5 years and all plots, soil respiration was not changed under the continuous warming, but was decreased by 3.7% under the N addition. The suppression of soil respiration by N addition in the third year and later could be mainly due to the reductions in the forb-to-grass biomass ratios. Moreover, there were interactive effects between continuous warming and N addition on soil respiration.Continuous warming increased soil respiration by 5.8% in the ambient N plots, but reduced it by 6.3% in the enriched N plots. Soil respiration was unaffected by N addition in the ambient temperature plots yet decreased by 9.4% in the elevated temperature plots. Changes of soil moisture and the proportion of legume biomass in the community might be primarily responsible for the non-additive effects of continuous warming and N addition on soil respiration. 4. This study provides empirical evidence for the positive climate warming-soil C feedback in the ambient N condition. However, N deposition reverses the positive warming-soil C feedback into a negative feedback, leading to decreased C loss from soils under a warming climate. Incorporating our findings into C-cycling models could reduce the uncertainties of model projections for land C sink and global C cycling under multifactorial global change scenarios.

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Section: Discussionmentioning

confidence: 99%

Plant functional types regulate non‐additive responses of soil respiration to 5‐year warming and nitrogen addition in a semi‐arid grassland

et al. 2021

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“…A previous study confirmed that Cyanobacteria in the bare substrate biocrusts of mountain vegetation types in the northern Urals were specific to different plant communities [ 52 ], which suggests that our future research needs to pay more attention to the effects of different sand-fixing plant communities on Cyanobacteria. Another possibility is that the sand-fixing combination of two leguminous shrubs inputs functional litter to the soil [ 71 ], leading to a significantly higher leaf C, N, P, and K content and a higher N:P ratio than those of nonleguminous plants [ 25 ], which further leads to a higher soil bacterial diversity and increases the abundance of bacterial phyla, such as Actinobacteria, Proteobacteria, Chloroflexi, Acidobacteria, and Bacteroidetes, in the soil instead of Cyanobacteria. This result indicates that leguminous plants had a strong competitiveness in leaf functional traits and changed the quality and properties of the litter.…”

Section: Discussionmentioning

confidence: 99%

“…The N-fixing function of leguminous leaves provides the soil with rich litter C and N resources [12,15,50], thus driving bacterial diversity by promoting soil fertility, which supported the hypothesis of this study. The functional traits and symbiotic systems of legumes explained the excellent performance of leguminous shrubs in soil improvement [94]; for example, the litter production and quality of arboreal legumes (Gliricidia sepium) (Herrera et al, 2020) and decomposition rete [31,71] promoted soil nutrient cycling. The asymbiotic leaf N-fixation traits also contribute significantly to soil N and C accumulation by mediating litter properties [50].…”

Section: The Restoration Of Sandy Land With Leguminous Shrubs Could E...mentioning

confidence: 99%

High-Throughput Absolute Quantification Sequencing Reveals that a Combination of Leguminous Shrubs Is Effective in Driving Soil Bacterial Diversity During the Process of Desertification Reversal

et al. 2022

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Desertification leads to the extreme fragility of ecosystems and seriously threatens ecosystem functioning in desert areas. The planting of xerophytes, especially leguminous shrubs, is an effective and common means to reverse desertification. Soil microorganisms play a crucial role in nutrient cycling and energy flow in ecosystems. However, the effects of introducing leguminous shrubs on soil microbial diversity and the relevant mechanisms are not clear. Here, we employed the high-throughput absolute quantification 16S rRNA sequencing method to analyze the diversity of soil bacteria in sand-fixing areas of mixed shrublands with three combinations of shrubs, i.e., C. korshinskii × Corethrodendron scoparium (CaKCoS), C. korshinskii × Calligonum mongolicum (CaKCaM), and C. scoparium × C. mongolicum (CoSCaM), in the south of the Mu Us Sandy Land, China. This area suffered from moving dunes 20 years ago, but after introducing these shrubs to fix the dunes, the ecosystem was restored. Additionally, the effects of soil physicochemical properties on soil bacterial composition and diversity were analyzed with redundancy analysis (RDA) and structural equation modeling (SEM). It was found that the Shannon index of soil bacteria in CaKCoS was significantly higher than that in CaKCaM and CoSCaM, and the abundance of the dominant phyla, including Actinobacteria, Proteobacteria, Acidobacteria, Chloroflexi, Planctomycetes, Thaumarchaeota, Armatimonadetes, candidate_division_WPS-1, and Nitrospirae, increased significantly in CaKCoS and CaKCaM compared to that in CoSCaM. RDA showed that the majority of soil properties, such as total nitrogen (TN), available potassium (AK), N:P ratio, soil moisture (SM), and available phosphorus (AP), were important soil environmental factors affecting the abundance of the dominant phyla, and RDA1 and RDA2 accounted for 56.66% and 2.35% of the total variation, respectively. SEM showed that the soil bacterial α-diversity was positively affected by the soil organic carbon (SOC), N:P ratio, and total phosphorus (TP). Moreover, CaKCoS had higher SM, total carbon (TC), total potassium (TK), and AP than CaKCaM and CoSCaM. Collectively, these results highlight a conceptual framework in which the combination of leguminous shrubs can effectively drive soil bacterial diversity by improving soil physicochemical properties and maintaining ecosystem functioning during desertification reversal. Graphical Abstract

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“…Defoliation is the subject of much research (Rua et al, 2020;Song et al, 2020;Donovan et al, 2021;Sánchez-Cuesta et al, 2021;Wang et al, 2021;Yang et al, 2021). In maize with increasing defoliation at the ear initiation stage, the grain yield decreases (Iledun & Rufus, 2017).…”

Section: Introductionmentioning

confidence: 99%

Dual-purpose production of forage and seeds in maize by detopping and defoliation

Heidari

Amiriani

2022

Agron. Colomb.

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Maize is one of the most productive crops whose seeds are used in the poultry sector as one of the main ingredients in their diet. It is also important forage for ruminants as silage. The aim of this research was to assess the effect of defoliation and detopping on dual-purpose maize production in field (Kermanshah, Iran, Mediterranean climate conditions) and laboratory experiments. The study included a control (intact plant), removal of leaves at the top of the ear, removal of leaves under the ear, removal of all leaves, detopping stem removal at the top of the ear, and detopping including removal of leaves under the ear. In the laboratory experiment, germination traits were assessed in seeds obtained from the mother plants in the field experiment. The field and laboratory experiments were conducted with a randomized complete block design and completely randomized design. The data were analyzed using a general linear model. The removal of leaves under the ear produced an increased seed number per row compared to the removal of leaves at the top of the ear. Intact plants (control) and the plants defoliated under the ear had a higher 100-seed weight than other treatments. There was no difference between detopping and control plants in seed yield. Removal of leaves under the ear of mother plants produced a lower seed germination percentage (83%), radicle length (11.3 cm), and seed vigor than in other treatments. The results show that maize can be cultivated as a dual-purpose crop for forage and seed production.

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Defoliation and neighbouring legume plants accelerate leaf and root litter decomposition of Leymus chinensis dominating grasslands

Cited by 6 publications

References 49 publications

Plant functional types regulate non‐additive responses of soil respiration to 5‐year warming and nitrogen addition in a semi‐arid grassland

Plant functional types regulate non‐additive responses of soil respiration to 5‐year warming and nitrogen addition in a semi‐arid grassland

High-Throughput Absolute Quantification Sequencing Reveals that a Combination of Leguminous Shrubs Is Effective in Driving Soil Bacterial Diversity During the Process of Desertification Reversal

Dual-purpose production of forage and seeds in maize by detopping and defoliation

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