Thinning Effects on Stand Structure and Carbon Content of Secondary Forests
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Data Collection
2.3. Data Analysis
2.3.1. DBH Structure Analysis
2.3.2. Spatial Structure Analysis
2.3.3. Carbon Analysis
3. Results
3.1. Effects of Thinning on DBH Structure
3.2. Effects of Thinning on Spatial Structure
3.2.1. Effects of Thinning on Crown Area
3.2.2. Effects of Thinning on Spatial Structure Index
3.3. Relationship between Spatial Structure Parameters and Carbon Stock under Different Treatments
3.3.1. Relationship between Crown Area and Carbon Stock
3.3.2. Relationship between Spatial Structure Index and Carbon Stock
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Thinning Treatment | Elevation/m | Species | Diameter at Breast Height/cm | Tree Height/m | Stand Density/Plant·hm−2 | Canopy Density/% | ||||
---|---|---|---|---|---|---|---|---|---|---|
Max | Min | Average | Max | Min | Average | |||||
CK | 456.8~492.1 | 2A.m:2A.t:1P.a:1A.f:1F:1P.k:1P.L:1P.a-T-U-A.u | 40.7 | 5.1 | 16.4 | 21.9 | 4.3 | 11.6 | 958 | 0.90 |
LT | 504~509 | 3A.t:2A.f:1P.a:1A.m:1F:2P.k-P.L-T-U | 42.7 | 5.1 | 13.5 | 22.6 | 3.9 | 9.6 | 1183 | 0.92 |
MT | 487~540 | 3A.m:2A.t:2A.f:1P.a1P.p:1F-P.L-B-T | 35.1 | 5.2 | 16.4 | 20.8 | 4.3 | 11.5 | 895 | 0.81 |
HT | 468.2~499 | 3A.m:2A.t:2A.f:1P.a:1P.L:1T-U-P.p-A.u | 42.8 | 5.3 | 17.1 | 23.6 | 5.3 | 11.7 | 813 | 0.76 |
Parameter | Formulations | Specific Meanings | ||||
---|---|---|---|---|---|---|
W-index | = 0 Absolutely uniform | = 0.25 Uniform | = 0.5 Random | = 0.75 Nonuniform | = 1 Clumped | |
M-index | = 0 Zero degree | = 0.25 Weak degree | = 0.5 Moderate degree | = 0.75 Strong degree | = 1 Extremely strong degree | |
U-index | = 0 Advantage | = 0.25 Subadvantage | = 0.5 Moderate | = 0.75 Disadvantage | = 1 Absolute disadvantage | |
C-index | = 0 Extremely sparse | = 0.25 Sparse | = 0.5 Moderately dense | = 0.75 Relatively dense | = 1 Extremely dense |
Spatial Structure Index | Thinning Treatment | Number | Result | |
---|---|---|---|---|
r Value | p Value | |||
W-index | CK | 37 | 0.073 | 0.251 |
LT | 52 | 0.180 | 0.364 | |
MT | 46 | 0.441 | 0.000 | |
HT | 32 | 0.367 | 0.006 | |
M-index | CK | 37 | 0.096 | 0.268 |
LT | 52 | 0.379 | 0.000 | |
MT | 46 | 0.167 | 0.002 | |
HT | 32 | 0.198 | 0.006 | |
U-index | CK | 37 | −0.160 | 0.027 |
LT | 52 | −0.273 | 0.000 | |
MT | 46 | −0.194 | 0.002 | |
HT | 32 | −0.072 | 0.000 | |
C-index | CK | 37 | −0.190 | 0.001 |
LT | 52 | −0.056 | 0.000 | |
MT | 46 | −0.244 | 0.000 | |
HT | 32 | 0.272 | 0.006 |
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Wang, Z.; Li, Y.; Meng, Y.; Li, C.; Zhang, Z. Thinning Effects on Stand Structure and Carbon Content of Secondary Forests. Forests 2022, 13, 512. https://doi.org/10.3390/f13040512
Wang Z, Li Y, Meng Y, Li C, Zhang Z. Thinning Effects on Stand Structure and Carbon Content of Secondary Forests. Forests. 2022; 13(4):512. https://doi.org/10.3390/f13040512
Chicago/Turabian StyleWang, Zichun, Yaoxiang Li, Yongbin Meng, Chunxu Li, and Zheyu Zhang. 2022. "Thinning Effects on Stand Structure and Carbon Content of Secondary Forests" Forests 13, no. 4: 512. https://doi.org/10.3390/f13040512