Abstract
Fine roots (FRs; <2 mm in diameter) might act as substantial pools of underground carbon and nutrients in the forest ecosystem. Since nutrient availability directly impacts plant growth, any changes in soil fertilization and subsequent changes in nutrients would alter the production of FRs. Here, we investigated the impact of fertilization with nitrogen (N) and phosphorus (P) [control, N (200 kg/ha/y), P (100 kg/ha/y), and N + P (200 kg N/ha/y + 100 kg P/ha/y)] on the FR production, biomass, turnover rate, N:P ratio in young (10-year) and nearly mature (40-year) Pinus tabulaeformis forest stands in the Loess Plateau in China. The production and biomass of FRs were evaluated using the ingrowth core and the soil core methods, respectively. The results showed that during the first growing season after N or P fertilization, neither the production, biomass nor the turnover rate of FRs responded significantly to the treatments. A substantial increase in the TN content was observed after fertilization with N, P, and N + P in the FR of the young forest stand, but not in the mature forest stand. The ratio of N:P in FRs increased after N addition but did not respond to P addition significantly in either the young or mature forest stands, indicating that FR N:P ratio was affected more by N availability than by P availability in P. tabulaeformis forests on the Loess Plateau.
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Claims 5
Claim · model-written summary
During the first growing season after N or P fertilization, fine root production, biomass and turnover rate did not respond significantly compared with control.
- Taxon
- Pinus tabulaeformis
Pinus tabuliformise0 - Organ / stage
- FRse1
- Treatment
- N or P fertilizatione1
- Outcome
- production, biomass nor the turnover rate of FRse1
- Direction
- no_changeinferrede1
- Comparator
- controle0
- Setting
- Loess Plateau in Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“[control, N (200 kg/ha/y), P (100 kg/ha/y), and N + P (200 kg N/ha/y + 100 kg P/ha/y)] on the FR production, biomass, turnover rate, N:P ratio in young (10-year) and nearly mature (40-year) Pinus tabulaeformis forest stands in the Loess Plateau in China”
e1“during the first growing season after N or P fertilization, neither the production, biomass nor the turnover rate of FRs responded significantly to the treatments”
Claim · model-written summary
Fertilization with N, P and N + P substantially increased fine root TN content in the young forest stand but not in the mature stand.
- Taxon
- Pinus tabulaeformisPinus tabuliformise0
- Organ / stage
- FRe2
- Treatment
- fertilization with N, P, and N + Pe2
- Outcome
- TN contente2
- Direction
- increasee2
- Qualifier
- but not in the mature forest stande2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“[control, N (200 kg/ha/y), P (100 kg/ha/y), and N + P (200 kg N/ha/y + 100 kg P/ha/y)] on the FR production, biomass, turnover rate, N:P ratio in young (10-year) and nearly mature (40-year) Pinus tabulaeformis forest stands in the Loess Plateau in China”
e2“A substantial increase in the TN content was observed after fertilization with N, P, and N + P in the FR of the young forest stand, but not in the mature forest stand”
Claim · model-written summary
N addition increased the N:P ratio in fine roots of Pinus tabulaeformis stands.
- Taxon
- Pinus tabulaeformisPinus tabuliformise0
- Organ / stage
- FRse3
- Treatment
- N additione3
- Outcome
- ratio of N:P in FRse3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“[control, N (200 kg/ha/y), P (100 kg/ha/y), and N + P (200 kg N/ha/y + 100 kg P/ha/y)] on the FR production, biomass, turnover rate, N:P ratio in young (10-year) and nearly mature (40-year) Pinus tabulaeformis forest stands in the Loess Plateau in China”
e3“The ratio of N:P in FRs increased after N addition but did not respond to P addition significantly in either the young or mature forest stands”
Claim · model-written summary
P addition did not significantly change the N:P ratio in fine roots of Pinus tabulaeformis stands.
- Taxon
- Pinus tabulaeformisPinus tabuliformise0
- Organ / stage
- FRse3
- Treatment
- P additione3
- Outcome
- ratio of N:P in FRse3
- Direction
- did not responde3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“[control, N (200 kg/ha/y), P (100 kg/ha/y), and N + P (200 kg N/ha/y + 100 kg P/ha/y)] on the FR production, biomass, turnover rate, N:P ratio in young (10-year) and nearly mature (40-year) Pinus tabulaeformis forest stands in the Loess Plateau in China”
e3“The ratio of N:P in FRs increased after N addition but did not respond to P addition significantly in either the young or mature forest stands”
Claim · model-written summary
FR N:P ratio was affected more by N availability than by P availability in P. tabulaeformis forests on the Loess Plateau.
- Taxon
- P. tabulaeformisPinus tabuliformise4
- Treatment
- N availabilitye4
- Outcome
- FR N:P ratioe4
- Comparator
- P availabilitye4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“indicating that FR N:P ratio was affected more by N availability than by P availability in P. tabulaeformis forests on the Loess Plateau”
The same questions in other papers
fertilization · yield · Pinus tabuliformis (southern Chinese pine)Positive and negative results
1 in the opposite direction
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.