Claim · model-written summary
Late-stage (18-30 months) high N addition decreased the average decomposition rate of order 1-2 fine roots by 58.35%.
- Taxon
- Pinus massoniana
Pinus massonianat0 - Organ / stage
- order 1–2e1
- Treatment
- high N additione0
- Outcome
- average decomposition ratese1
- Direction
- decreasede1
- Value
- 58.35%e1
- Qualifier
- late stage of decomposition (18−30 months)e0
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pinus massoniana”
e0“In the late stage of decomposition (18−30 months), high N addition”
e1“the average decomposition rates of order 1–2, order 3–4, order 5–6 fine roots were decreased by 58.35%, 35.43% and 47.56% respectively”
Title
Lijun Wang; Yafei Shen; Ruimei Cheng; et al. Frontiers in Plant Science 2022. doi:10.3389/fpls.2022.1048153
Other claims from this paper (16)
- Intervention effect Early-stage (0-18 months) N addition at all concentrations increased the average decomposition rate of order 1-2 fine roots of Pinus massoniana by 13.54%.
- Intervention effect Early-stage (0-18 months) N addition at all concentrations increased the average decomposition rate of order 3-4 fine roots by 6.15%.
- Intervention effect Early-stage (0-18 months) N addition at all concentrations increased the average decomposition rate of order 5-6 fine roots by 7.96%.
- Intervention effect Late-stage (18-30 months) high N addition decreased the average decomposition rate of order 3-4 fine roots by 35.43%.
- Intervention effect Late-stage (18-30 months) high N addition decreased the average decomposition rate of order 5-6 fine roots by 47.56%.
- Intervention effect In the early stage, N addition promoted the release of lignin, carbon and nitrogen from decomposing fine roots.
- Intervention effect In the early stage, N addition promoted the release of phosphorus from decomposing fine roots.
- Intervention effect In the late stage, high N addition inhibited the release of lignin, carbon and nitrogen from decomposing fine roots.
- Intervention effect In the late stage, high N addition inhibited the activities of the lignin-degrading enzymes peroxidase and polyphenol oxidase.
- Association The decomposition constant k was significantly correlated with the initial chemical quality of the fine roots and with lignin-degrading enzyme activities.
- Association Higher-order (order 3-4 and 5-6) fine roots decomposed faster than lower-order (order 1-2) fine roots.
- Mechanism The faster decomposition of higher-order fine roots is attributed to higher initial cellulose, starch, sugar and C concentrations, higher C/N, C/P and lignin/N ratios and lower N and P concentrations.
- Intervention effect Low N addition (30 kg N ha-1 year-1) decreased soil organic matter content.
- Intervention effect High N addition (90 kg N ha-1 year-1) had the opposite effect on soil organic matter content to low N.
- Intervention effect All the N treatments reduced soil pH and total P content.
- Mechanism The authors suggest that increased N deposition may lead to soil acidification.