Fine-root distribution, production, decomposition, and effect on soil organic carbon of three revegetation shrub species in northwest China

Lai, Zongrui; Zhang, Yuqing; Liu, Jiabin; Wu, Bin; Qin, Shugao; Fa, Keyu

doi:10.1016/j.foreco.2015.04.025

Cited by 81 publications

(71 citation statements)

References 53 publications

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“…In this study, mass residual ratio was 15%–47% after the first 120 days of decomposition for the four sandy shrubs; whereas the ratio was 0.5%–3% during the period from 120 to 360 days. Similarly, mass residual ratio was 15%–25% after the first 150 days of fine‐root decomposition for A. ordosica , S. psammophila, and H. mongolicum planted in the Mu Us Desert, whereas the value remained at only 5%–10% during the following period of 2 years (Lai et al, ). Therefore, the long‐term effect of fine‐root decomposition on the environment was poorly reflected and would be difficult to be predicted accurately based on the short‐term decomposition process, which indicated that the range of decomposition periods should be arranged more rationally in further studies.…”

Section: Discussionmentioning

confidence: 93%

“…Typical species for vegetation restoration in the Gonghe basin are Salix cheilophila , Salix psammophila , Caragana intermedia , and Caragana korshinskii , which play a significant role in water–soil conservation, as windbreaks and for sand fixation (Yu et al, ). Many investigations have focused on factors affecting belowground or aboveground litter decomposition and change in nutrients, including for Sabina vulgaris , Artemisia ordosica , Caragana microphylla , Salix gordejevii , Artemisia halodendron , Salix psammophila, and Hedysarum mongolicum , within Mu Us Sandy Land and Horqin Sandy Land (Lai et al, ; Qin, Hu, Wang, Na, & Zhang, ; Qu et al, ). However, few studies have been conducted on fine‐root decomposition in the Gonghe basin at high altitude and low temperature.…”

Section: Introductionmentioning

confidence: 99%

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Fine‐root decomposition characteristics of four typical shrubs in sandy areas of an arid and semiarid alpine region in western China

Jia

et al. 2019

Ecology and Evolution

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Background and aims Research into the variability of fine‐root decomposition and nutrient cycling processes in arid and semiarid ecosystems is highly significant not only for investigations of regional and global carbon and nitrogen cycling but also for offering a theoretical basis for vegetation restoration and reconstruction. In particular, information is limited on fine‐root decomposition processes and nutrient releasing characteristics in the high‐altitude Qinghai Gonghe basin, which has different tree species and variable fine‐root diameters. Materials and methods Four types of Salicaceae and Caragana shrubs were selected at the Qinghai Gonghe desert ecosystem research station. The litterbag method was adopted to measure decomposition rates of fine‐roots with three diameter classes (1–2 mm, 0.5–1 mm, and 0–0.5 mm). Chemical analysis was performed to determine nutrient (C, N, P, and K) concentrations of fine‐root, and nutrient release rates were compared among fine‐roots with different diameters during different decomposition periods. The differences in mass residual ratio and nutrient release rate among different diameter classes were studied with one‐way ANOVA. Results Fine‐root decomposition rates were in the order Caragana intermedia > Caragana korshinskii > Salix psammophila > Salix cheilophila . Fine‐root decomposition showed a trend of “fast‐slow‐fast” variation, and decomposition rate increased as the diameter of fine‐roots increased, irrespective of tree species. During the decomposition process, the nutrients C, N, and P of fine‐root were in a release state for the four shrubs with different fine‐root diameters, and the corresponding release rates of Caragana shrubs were higher than those of Salicaceae shrubs. Release rates of nutrients C and N accelerated as fine‐root diameter increased, whereas release rates of nutrients P and K had no observed relation with fine‐root diameter. Fine‐root decomposition ratio was significantly correlated with initial values of N, P, C/N, C/P, and N/P of fine‐root. Fine‐root mass loss ratio was significantly correlated with initial concentration of soil nutrient K, and the correlation was positive for fine‐roots with diameters of 0–0.5 mm and 0.5–1 mm; however, no other significant correlation was observed between fine‐root mass loss ratio and initial soil environmental factors within this study. Conclusions Our study showed that tree species and fine‐root diameter strongly affected decomposition rates, whereas diameter class exerted little effect on nutrient release rates.

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Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Fine‐root decomposition characteristics of four typical shrubs in sandy areas of an arid and semiarid alpine region in western China

Jia

et al. 2019

Ecology and Evolution

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“…Qi et al, 2002;Chen and Duan, 2009;Zhang and Hou, 2012;Liu et al, 2015;Lai et al, 2016). The mass fraction of the resistant SOM pool (M hum ) was set to 40-50 % of the total SOM, following work of Lai et al (2016). The vertical distribution of the SOM pools was described following Shi et al (2013).…”

Section: Parameterization Of Soil C and N Poolsmentioning

confidence: 99%

“…The total root biomass was then calculated as proportional to the aboveground biomass using a root-shoot ratio of 0.47 (M R = 0.47M S ; Xiao et al, 2005). The vertical profile of root biomass was parameterized as decreasing exponentially with depth, using the depth profile reported by Lai et al (2016). In the horizontal direction, root biomass was set to decrease linearly with the distance from the centre of a shrub crown (Zhang et al, 2008).…”

Section: Parameterization Of Soil C and N Poolsmentioning

confidence: 99%

“…Based on the above settings, the specific decomposition rate of debris was estimated from the litterbag experiment done by Lai et al (2016), which showed a 16 % decrease in the mass of fine-root litter during a 7-month period in 2013 at the Yanchi site. The photodegradation coefficient (k p ) was set to 0.23 yr −1 , which was the mass-loss rate reported by Austin and Vivanco (2006).…”

Section: Parameterization Of Soil C and N Poolsmentioning

confidence: 99%

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Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity

et al. 2018

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Abstract. We used process-based modelling to investigate the roles of carbon-flux (C-flux) components and plantinterspace heterogeneities in regulating soil CO 2 exchanges (F S ) in a dryland ecosystem with sparse vegetation. To simulate the diurnal and seasonal dynamics of F S , the modelling considered simultaneously the CO 2 production, transport and surface exchanges (e.g. biocrust photosynthesis, respiration and photodegradation). The model was parameterized and validated with multivariate data measured during the years 2013-2014 in a semiarid shrubland ecosystem in Yanchi, northwestern China. The model simulation showed that soil rewetting could enhance CO 2 dissolution and delay the emission of CO 2 produced from rooting zone. In addition, an ineligible fraction of respired CO 2 might be removed from soil volumes under respiration chambers by lateral water flows and root uptakes. During rewetting, the lichen-crusted soil could shift temporally from net CO 2 source to sink due to the activated photosynthesis of biocrust but the restricted CO 2 emissions from subsoil. The presence of plant cover could decrease the root-zone CO 2 production and biocrust C sequestration but increase the temperature sensitivities of these fluxes. On the other hand, the sensitivities of root-zone emissions to water content were lower under canopy, which may be due to the advection of water flows from the interspace to canopy. To conclude, the complexity and plant-interspace heterogeneities of soil C processes should be carefully considered to extrapolate findings from chamber to ecosystem scales and to predict the ecosystem responses to climate change and extreme climatic events. Our model can serve as a useful tool to simulate the soil CO 2 efflux dynamics in dryland ecosystems.

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Effects of Hedysarum leguminous plants on soil bacterial communities in the Mu Us Desert, northwest China

Zhou

Ding

et al. 2020

Ecology and Evolution

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This study assessed the influence of rhizocompartment types (i.e., root, rhizosphere soil, root‐zone soil, and intershrub bulk soil) on the diversity of soil microbial communities under desert leguminous plant shrubs. Moreover, the influence and variations of soil physicochemical factors in interactions among leguminous plants, soil, and microbes were investigated. Both 16S rRNA high‐throughput genome sequencing and conventional soil physicochemical index determination were used to characterize both the bacterial diversity and soil physicochemical properties in the rhizocompartments of two Hedysarum species ( Hedysarum mongolicum and Hedysarum scoparium ) in the Mu Us Desert of China. All nutrient indices (except total phosphorus and available phosphorus) in rhizosphere soil were uniformly higher than those in both root‐zone soil and intershrub bulk soil ( p < .05). The bacterial community diversity in the root, undershrub soil (i.e., rhizosphere and root zone), and intershrub bulk soil also showed significant differences ( p < .05). The bacterial community in the root is mainly composed of Proteobacteria, Actinobacteria, Bacteroidetes, Tenericutes, and Chloroflexi, among which bacteria of the Proteobacteria genus are dominant. Root endophyte and rhizosphere soil microbiomes were mainly influenced by soil nutrients, while bacterial communities in root‐zone soil and intershrub bulk soil were mainly influenced by soil pH and NH 4 + ‐N. The rhizocompartment types of desert leguminous plants impose a significant influence on the diversity of soil microbial communities. According to these findings, nitrogen‐fixing rhizobia can co‐exist with nonsymbiotic endophytes in the roots of desert leguminous plants. Moreover, plants have a hierarchical filtering and enriching effect on beneficial microbes in soil via rhizocompartments. Soil physicochemical factors have a significant influence on both the structure and composition of microbial communities in various rhizocompartments, which is derived from the interactions among leguminous plants, soil, and microbes.

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Fine-root distribution, production, decomposition, and effect on soil organic carbon of three revegetation shrub species in northwest China

Cited by 81 publications

References 53 publications

Fine‐root decomposition characteristics of four typical shrubs in sandy areas of an arid and semiarid alpine region in western China

Fine‐root decomposition characteristics of four typical shrubs in sandy areas of an arid and semiarid alpine region in western China

Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity

Effects of Hedysarum leguminous plants on soil bacterial communities in the Mu Us Desert, northwest China

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Fine-root distribution, production, decomposition, and effect on soil organic carbon of three revegetation shrub species in northwest China

Cited by 81 publications

References 53 publications

Fine‐root decomposition characteristics of four typical shrubs in sandy areas of an arid and semiarid alpine region in western China

Fine‐root decomposition characteristics of four typical shrubs in sandy areas of an arid and semiarid alpine region in western China

Modelling the diurnal and seasonal dynamics of soil CO&lt;sub&gt;2&lt;/sub&gt; exchange in a semiarid ecosystem with high plant–interspace heterogeneity

Effects of Hedysarum leguminous plants on soil bacterial communities in the Mu Us Desert, northwest China

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Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity