Fine Root Dynamics in Three Forest Types with Different Origins in a Subalpine Region of the Eastern Qinghai-Tibetan Plateau
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Site
2.2. Sampling Design
2.3. Sequential Soil Coring
2.4. Stand Characteristics and Aboveground Biomass
2.5. Soil Characteristics
2.6. Data Analysis
3. Results
3.1. Comparison of Fine Roots among Forest Types
3.2. Seasonal Dynamics of Fine Root Biomass and Necromass
3.3. Vertical Distribution of Fine Roots
3.4. Relationships between Fine Root Dynamics and Soil N Availability
3.5. Relationships between Fine Root Dynamics and Aboveground Biomass
4. Discussion
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameters | MF | NF | PF |
---|---|---|---|
Origin | Artificial + natural | Natural | Artificial |
Average age (year) | ~28 | ~30 | ~30 |
Altitude (m) | 2983~3046 | 2971~3029 | 2913~2955 |
Slope | Southeast | Southeast | Southeast |
Stand height (m) | 6.07 ± 0.39 b | 10.19 ± 0.96 a | 8.28 ± 0.33 a |
Stand DBH (cm) | 9.02 ± 0.37 b | 9.50 ± 0.26 b | 11.40 ± 0.38 a |
Stand density (stem ha−1) | 2266.67 ± 134.11 a | 2083.33 ± 151.61 a | 1433.33 ± 88.19 b |
Stand basal area (m2 ha−1) | 14.41 ± 0.52 a | 14.67 ± 0.41 a | 14.65 ± 0.84 a |
Aboveground biomass (kg m−2) | 6.75 ± 0.12 a | 7.02 ± 0.13 a | 7.28 ± 0.18 a |
Dominant tree species 1 | Picea asperata Mast. (51.42) | Abies faxoniana Rehd. et Wils (36.54) | Picea asperata Mast. (100) |
Betula albo-sinensis Burk. (23.47) | Betula albo-sinensis Burk. (28.09) | ||
Cerasus duclouxii (Koehne) Yu et Li (11.64) | Sorbus koehneana Schneid. (10.50) | ||
Sorbus koehneana Schneid. (5.35) | Cerasus duclouxii (Koehne) Yu et Li (8.53) | ||
Acer L. (5.02) | Betula utilis D. Don (6.11) | ||
Acer L. (5.56) | |||
Tree species diversity | 0.75 ± 0.06 a | 0.91 ± 0.04 a | 0 |
Soil C content (g kg−1) | |||
0–10 cm | 47.54 ± 6.89 a | 48.28 ± 7.84 a | 33.80 ± 7.59 a |
10–20 cm | 25.84 ± 3.56 a | 43.92 ± 5.07 a | 26.93 ± 5.70 a |
20–30 cm | 16.60 ± 2.67 a | 42.06 ± 8.74 a | 25.10 ± 5.29 a |
Soil N content (g kg−1) | |||
0–10 cm | 3.02 ± 0.53 a | 2.73 ± 0.25 a | 1.95 ± 0.66 a |
10–20 cm | 1.51 ± 0.30 a | 2.38 ± 0.18 a | 1.30 ± 0.45 a |
20–30 cm | 0.78 ± 0.16 a | 2.25 ± 0.36 a | 1.30 ± 0.53 a |
C:N ratio | |||
0–10 cm | 15.99 ± 0.66 a | 17.60 ± 1.80 a | 18.85 ± 2.34 a |
10–20 cm | 17.51 ± 1.00 a | 18.48 ± 1.72 a | 22.61 ± 2.86 a |
20–30 cm | 21.86 ± 1.22 a | 18.53 ± 1.71 a | 22.28 ± 3.75 a |
Trend | Live | ||
---|---|---|---|
Increase | Decrease | ||
Dead | ∆Blive < ∆Bdead | ∆Blive > ∆Bdead | |
Increase | P = ∆Blive + ∆Bdead | P = ∆Blive + ∆Bdead | P = 0 |
Decrease | P = ∆Blive | P = 0 |
Source | d.f. | FRB | FRN | FRB:FRN | FRP | FRT |
---|---|---|---|---|---|---|
Type | 2 | 96.42 *** | 61.69 *** | 21.17 *** | 37.25 *** | 59.56 *** |
Depth | 2 | 417.04 *** | 217.87 *** | 11.14 ** | 699.38 *** | 68.43 *** |
Type × Depth | 4 | 66.55 *** | 14.78 *** | 3.43 * | 54.20 *** | 1.15 NS |
Fine Root Dynamics | Ammonium | Nitrate | Inorganic N |
---|---|---|---|
Fine root biomass | −0.96 ** | 0.07 | −0.91 ** |
Fine root production | −0.88 ** | 0.04 | −0.86 ** |
Fine root turnover rate | 0.88 ** | −0.16 | 0.80 ** |
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Liu, S.; Luo, D.; Yang, H.; Shi, Z.; Liu, Q.; Zhang, L.; Kang, Y. Fine Root Dynamics in Three Forest Types with Different Origins in a Subalpine Region of the Eastern Qinghai-Tibetan Plateau. Forests 2018, 9, 517. https://doi.org/10.3390/f9090517
Liu S, Luo D, Yang H, Shi Z, Liu Q, Zhang L, Kang Y. Fine Root Dynamics in Three Forest Types with Different Origins in a Subalpine Region of the Eastern Qinghai-Tibetan Plateau. Forests. 2018; 9(9):517. https://doi.org/10.3390/f9090517
Chicago/Turabian StyleLiu, Shun, Da Luo, Hongguo Yang, Zuomin Shi, Qianli Liu, Li Zhang, and Ying Kang. 2018. "Fine Root Dynamics in Three Forest Types with Different Origins in a Subalpine Region of the Eastern Qinghai-Tibetan Plateau" Forests 9, no. 9: 517. https://doi.org/10.3390/f9090517