Changes in nitrogen resorption of trembling aspen (Populus tremuloides) with stand development

Yuan, Zhengqiang; Chen, Han Y. H.

doi:10.1007/s11104-009-0036-8

Cited by 38 publications

(25 citation statements)

References 64 publications

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“…In our chronosequence, the N:P ratio in forest floor, with three replicates and dry combustion method for N and acid hydrolysis for P (Shrestha & Chen 2010), increased from 3-year-old to 11-year-old stands and gradually levelled off thereafter. When the green-leaf N:P ratios were considered (Yuan & Chen 2010a), we found the values of green-leaf N:P ratios of trembling aspen (Populus tremuloides) in 11, 29, 94 and 142-old stands declined in older stands (Fig. 4).…”

Section: Discussionmentioning

confidence: 93%

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Fine root dynamics with stand development in the boreal forest

Yuan

Chen

2012

Functional Ecology

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Summary1. Despite greater importance of below ground in influencing terrestrial carbon and nutrient cycling than above ground, how below-ground biomass, production, turnover and mortality change with stand development remains poorly understood. 2. Here, we used a postfire boreal forest chronosequence that spanned over 200 years (3, 11, 29, 94, 142 and 205 years since fire) to study how the dynamics of fine roots ( 2 mm in diameter) vary with stand age. We collected 756 sequential cores and 270 ingrowth cores, each separated to layers and live/dead, resulting in a total of 5076 fine root samples to quantify fine root biomass, production, mortality and turnover rates. 3. With stand development, fine root biomass increased from 3 to 94-year-old, and declined thereafter, whereas necromass increased to 142-year-old and levelled off at 205-year-old. Fine root production and turnover increased from 3 to 11-year-old stands, and declined thereafter. Fine root mortality increased from 3 to 142-year-old stands. 4. Our study, the first to show four simultaneous stand age-dependent below-ground attributes, indicated that fine roots in young stands turn over faster than in old stands based on the estimates from both sequential and ingrowth cores. Despite some similarities among the studied attributes, the peaks they reached were not the same. Our results suggest that fine root dynamics are influenced by changes in species composition and soil properties associated with stand development in the boreal forest, especially the increase in forest floor nitrogen: phosphorus ratios as stand age increases.

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Section: Discussionmentioning

confidence: 93%

“…Values are mean ± 1 SE ( n = 3). Data of forest floor from Shrestha & Chen () and of green leaves from Yuan & Chen ().…”

Section: Discussionmentioning

confidence: 99%

Fine root dynamics with stand development in the boreal forest

Yuan

Chen

2012

Functional Ecology

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“…Furthermore, both soil fertility and stand age may play roles in plant NuRE [12]. Studies have revealed negative correlations between NRE and PRE with stand age [78][79][80]. We note that many physiological changes occur with plant age that are not completely understood [76].…”

Section: Response Of Nure and Growth To Elevation And Forest Managemementioning

confidence: 87%

The C:N:P Stoichiometry of Planted and Natural Larix principis-rupprechtii Stands along Altitudinal Gradients on the Loess Plateau, China

Zhang

Chen

et al. 2020

Forests

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Carbon:nitrogen:phosphorus (C:N:P) stoichiometry plays a critical role in nutrient cycling, biodiversity, and ecosystem functionality. However, our understanding of the responses of C:N:P stoichiometry to elevation and forest management remains elusive. Here we sampled 18 Larix principis-rupprechtii sites along altitudinal gradients (1700-2300 m) on Guandishan Mountain in the Loess Plateau, China. We determined the leaf, litter, and soil C N P contents and C:N:P stoichiometric ratios, as well as nutrient resorption efficiency (NuRE), and diameter at breast height (DBH) increments in both planted and natural stands, and then tested the impacts of elevation and stand origin on these parameters’ management. We found different C:N:P stoichiometry between natural and planted forests. The results revealed that: soil C, N, and N:P ratios, litter C:P and N:P ratios, leaf C:N and N:P ratios increased significantly; however, soil C:N ratios, litter P, leaf N and P, nitrogen resorption efficiency (NRE), and DBH increments decreased significantly with elevation in the planted forests. Soil C,N and N:P ratios, litter C, as well as C:N and C:P ratios increased significantly with elevation in natural forests. The soil N, P and N:P ratios, litter C:P and N:P ratios, leaf C, C:P and N:P ratios, nitrogen resorption efficiency (NRE), phosphorus resorption efficiency (PRE), and DBH increments were, on average, higher in the planted, rather than natural forests. Our results indicated that there was an enhancing P-limitation in both the planted and natural forests, and the plantations were more restricted by P. Moreover, compared to natural forests, plantations converged toward a higher conservative N- and P-use strategy by enhancing resorption efficiencies of internal nutrient cycling and a higher annual growth rate.

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“…tabulaeformis . Chronosequence previously proved effective for assessing the changes in soil physicochemical properties (An, Huang, & Zheng, ; Jangid, Whitman, Condron, Turner, & Williams, ; Williams, Jangid, Shanmugam, & Whitman, ; Yuan & Chen, ; Yuan & Chen, ) and microbial community composition (Albornoz et al, ; Li et al, ; Zhang, Liu, Xue, & Wang, ) in revegetation. We selected four different stands (10, 25, 40, and 60 years old) based on archives of the local forest service.…”

Section: Methodsmentioning

confidence: 99%

Changes in rhizosphere bacterial and fungal community composition with vegetation restoration in planted forests

et al. 2019

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Soil microbial communities affect nutrient cycling and ecosystem functioning. However, the variations in microbial diversity and community composition within degraded landscapes remain unclear. Using high-throughput sequencing of bacterial 16S ribosomal RNA genes and internal transcribed spacer fungal sequences, we investigated the rhizosphere microbial diversity and community of coniferous Pinus tabulaeformis Carr. forests in degraded lands across a chronosequence that spanned over 60 years (10, 25, 40, and 60 years since restoration, four forest stands). We found significant differences in soil bacterial and fungal communities among stand ages. Actinobacteria, Proteobacteria, and Acidobacteria dominated the rhizosphere, whereas Basidiomycota, Ascomycota, and Zygomycota prevailed as fungal components.With stand development, bacterial diversity decreased, but fungal diversity increased.Nonmetric multidimensional scaling analysis separated bacterial community clusters well by stands. Fungal community clusters of 25-and 60-year-old stands overlapped.The dominant bacteria Acidobacteria showed the highest relative abundance at the 40-year-old stands. Soil microbial communities correlated significantly with the macro-nutrients (soil organic carbon, total nitrogen, and total phosphorous). Additionally, the relative abundance of Acidobacteria at the phylum level correlated positively with soil total phosphorous; Deltaproteobacteria at the class level correlated positively with soil organic carbon and total nitrogen. Thus, restoring vegetation in degraded temperate forests enhanced some macronutrients and influenced microbial communities. Our results revealed that restoring vegetation in degraded lands decreased the diversity of bacterial communities over time. In contrast, the soil fungal diversity increased after restoration, and fungal communities in the 25-and 60-year-old forest stands overlapped on degraded soils.

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Changes in nitrogen resorption of trembling aspen (Populus tremuloides) with stand development

Cited by 38 publications

References 64 publications

Fine root dynamics with stand development in the boreal forest

Fine root dynamics with stand development in the boreal forest

The C:N:P Stoichiometry of Planted and Natural Larix principis-rupprechtii Stands along Altitudinal Gradients on the Loess Plateau, China

Changes in rhizosphere bacterial and fungal community composition with vegetation restoration in planted forests

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