Nitrogen deposition and increased precipitation interact to affect fine root production and biomass in a temperate forest: Implications for carbon cycling

Li, Xiaowei; Zhang, Chenlu; Zhang, Beibei; Wu, Di; Zhu, Dandan; Zhang, Wei; Ye, Qing; Yan, Junhua; Fu, Juemin; Fang, Chengliang; Ha, Denglong; Fu, Shenglei

doi:10.1016/j.scitotenv.2020.144497

Cited by 58 publications

(26 citation statements)

References 77 publications

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“…Changing land use, however, presents us with a problem because it can dramatically alter the albedo and exacerbate climate change, accelerate rates of soil degradation and erosion, and cause loss of biodiversity. Soil erosion is one of the most prominent environmental impacts associated with land use change, and has resulted in extensive loss of productivity and ecosystem services at the global scale (Green et al, 2005;Montgomery, 2007;Ramankutty et al, 2008;Foley et al, 2011;Ercoli et al, 2020;Li et al, 2021). The associated decline in habitat quality and fragmentation caused by development has a wide range of deleterious impacts on soil conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Land Use Change on Gully Erosion Density in the Black Soil Region of Northeast China From 1965 to 2015: A Case Study of the Kedong County

Zhu

et al. 2021

Front. Environ. Sci.

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Kedong County is typical of the black soil region of northeast China in being highly susceptible to accelerated soil erosion by gullying. Using data sourced from Corona satellite imagery for 1965, SPOT5 for 2005 and GF-1 for 2015, the spatial distribution of gullies in the research area was mapped. Land use data for 1965, 2005, and 2015 were obtained from the topographic map of 1954, and from Landsat images for 2005 and 2015. Over the last 50 years, the extent of gully erosion in the study area has increased markedly, most notably on cultivated land, while gully density rose from 2,756.16 m2/km2 to 14,294.19 m2/km2. Cultivating land on slopes, especially on slopes greater than ∼4°, may rapidly aggravate gully erosion. The greatest increases in gully density occurred in situations when cultivated land and other/degraded land were transformed, which gully erosion density increased by 49,526.69 m2/km2. Other/degraded land is the most vulnerable land in the study area, with the highest gully erosion density. In these cases, gully density initially increases and, although the “Grain for Green” project has been implemented, gully erosion density has not always declined in the recent past.

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Section: Introductionmentioning

confidence: 99%

Effect of Land Use Change on Gully Erosion Density in the Black Soil Region of Northeast China From 1965 to 2015: A Case Study of the Kedong County

Zhu

et al. 2021

Front. Environ. Sci.

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“…We used the ingrowth core method to measure fine root growth and to obtain an estimate of annual fine root production (Neill, 1992; Hertel et␣al ., 2013; Rodtassana & Tanner, 2018; Li et␣al ., 2020). Each ingrowth core was 2.4 cm in diameter and 10 cm tall and consisted of soil contained in a high‐density polyethylene net cylinder with a 2 mm mesh.…”

Section: Methodsmentioning

confidence: 99%

“…We used the sequential soil‐coring method to estimate fine root biomass (Ostonen et␣al ., 2005; Valverde‐Barrantes et␣al ., 2015; Li et␣al ., 2020). During the fifth and sixth years of N addition, that is, from May 2017 to March 2019, fine root samples (< 2 mm) were collected every 2 months; as a result, fine roots were sampled a total of 12 times.…”

Section: Methodsmentioning

confidence: 99%

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Canopy and understory nitrogen addition have different effects on fine root dynamics in a temperate forest: implications for soil carbon storage

Zhang

et al. 2021

New Phytologist

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Elucidating the effects of atmospheric nitrogen (N) deposition on fine root dynamics and the potential underlying mechanisms is required to understand the changes in belowground and aboveground carbon storage. However, research on these effects in forests has mostly involved direct understory addition of N and has ignored canopy interception and processing of N.Here, we conducted a field experiment comparing the effects of canopy addition of N (CAN) with those of understory addition of N (UAN) at three N-addition rates (0, 25 and 50 kg N ha -1 yr -1 ) on fine root dynamics in a temperate deciduous forest.Fine root production and biomass were significantly higher with CAN than with UAN. At the same N-addition rate, increases in fine root production with CAN were at least two-fold greater than with UAN. At the high N-addition rate and relative to the control, fine root biomass was significantly increased by CAN (by 23.5%) but was significantly decreased by UAN (by 12.2%).Our results indicate that traditional UAN may underestimate the responses of fine root dynamics to atmospheric N deposition in forest ecosystems. Canopy N processes should be considered for more realistic assessments of the effects of atmospheric N deposition in forests.

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“…Such effects are normally assessed via the comparison of soil organic matter (SOM) decomposition rate in the presence or absence of living roots (Cheng and Kuzyakov, 2005;Kuzyakov, 2010;Dijkstra et al, 2021), which is termed rhizosphere priming effect (RPE) (Kuzyakov, 2002;Cheng et al, 2014). Nitrogen (N) is widely regarded as the key limiting nutrient for plant growth in terrestrial ecosystems (Lebauer and Treseder, 2008;Frank and Groffman, 2009;Li et al, 2021), and soil N cycling is complicated, involving many simultaneously occurring transformation processes (Holz et al, 2016). Given the method challenges in measuring soil gross N mineralization rate (N min ) (Murphy et al, 2003), there is much less attention about rhizosphere effects on soil gross N min compared to those on soil C mineralization rate (C min ) (Kuzyakov, 2002;Booth et al, 2005;Zhu et al, 2014;Yin et al, 2018;Sun et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The rhizosphere effect on soil gross nitrogen mineralization: A meta-analysis

2021

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Rhizosphere effects play crucial roles in determining soil carbon (C) and nitrogen (N) cycling. However, the rhizosphere effect on soil gross nitrogen (N) mineralization (N min ) has not been quantitatively assessed on the global scale. Here we performed a meta-analysis of compiled data from 24 publications and 37 species to synthesize the rhizosphere effect on soil gross N min and its influencing factors. We found that the rhizosphere effect significantly enhanced soil gross N min by 81% on average. Such rhizosphere effect was significantly higher in woody species than in nonwoody species, and higher in ECM (ectomycorrhizal) associated species than in AM (arbuscular mycorrhizal) associated species. Moreover, the variations of the rhizosphere effect on soil gross N min were correlated with those on soil C mineralization, phenol oxidase activity and root biomass rather than with other plant (growth form and mycorrhizal association) and climatic (mean annual temperature and precipitation) factors. These results support the 'microbial activation' and 'microbial N mining' hypotheses of rhizosphere effects and indicate the coupling of soil C and gross N mineralization in the rhizosphere. Overall, these findings provide novel insights into the rhizosphere effect on soil gross N min among plant growth forms and mycorrhizal associations, and improve our mechanistic understanding of soil N dynamics in the rhizosphere.

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Nitrogen deposition and increased precipitation interact to affect fine root production and biomass in a temperate forest: Implications for carbon cycling

Cited by 58 publications

References 77 publications

Effect of Land Use Change on Gully Erosion Density in the Black Soil Region of Northeast China From 1965 to 2015: A Case Study of the Kedong County

Effect of Land Use Change on Gully Erosion Density in the Black Soil Region of Northeast China From 1965 to 2015: A Case Study of the Kedong County

Canopy and understory nitrogen addition have different effects on fine root dynamics in a temperate forest: implications for soil carbon storage

The rhizosphere effect on soil gross nitrogen mineralization: A meta-analysis

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