A Basal Area Increment-Based Approach of Site Productivity Evaluation for Multi-Aged and Mixed Forests
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area and Data
2.2. Basal Area Potential Productivity Index
- (i)
- Stability: BAPP is dependent on site type, stand type, and T. Thus, when these variables are quantified, BAPP can be determined.
- (ii)
- Maximization: BAPP reflects the maximum mean annual BAI of a particular site type, stand type, and T; therefore, the mean annual BAI of a stand is always less than or equal to BAPP. However, in theory, the mean annual BAI can be close, or even equal to BAPP for an appropriately managed stand.
Computational Conditions for BAPP
2.2.1. The GS&DIA Procedure
2.3. BARP
2.4. Stand Mean Height and Stand Basal Area Growth Models
3. Results
3.1. Parameter Estimation
3.2. BAPP Calculation
- (i)
- Equation (12) was used as a growth model, and its parameter estimates are given in Table 2;
- (ii)
- Equation (13) was used as a growth model, and its parameter estimates are listed in Table 2;
- (iii)
- Ten site groups denoted by were applied.
- (iv)
- The feasible range of ranged from 10 to 150 years.
- (v)
- A 50-year base age () was used.
- (vi)
- The feasible region of ranged from 30 to 3000.
3.3. BAPP Verification
3.4. Application of BAPP in Forest Management
4. Discussion
Supplementary Materials
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Stand Type | Variable | Max. | Min. | Mean | Std. |
---|---|---|---|---|---|
I | (m2 ha−1) | 61.19 | 0.21 | 20.87 | 10.30 |
1857.97 | 10.45 | 731.24 | 321.56 | ||
T (year) | 169 | 6 | 59 | 29 | |
H (m) | 21.51 | 5.04 | 13.51 | 2.71 | |
II | (m2 ha−1) | 55.47 | 0.07 | 18.93 | 9.15 |
1541.27 | 3.90 | 651.37 | 279.07 | ||
T (year) | 198 | 7 | 63 | 31 | |
H (m) | 24.24 | 4.11 | 15.08 | 2.81 |
Stand Type | Site Group | Equation (12) | Equation (13) | |||||
---|---|---|---|---|---|---|---|---|
I | 22.8815 | 0.0059 | 0.1818 | 57.3370 | 54.4206 | 5.4439 | 0.1843 | |
22.0010 | 0.0063 | 0.2216 | 68.0126 | 54.4206 | 5.4439 | 0.1843 | ||
21.5656 | 0.0067 | 0.2615 | 66.6466 | 54.4206 | 5.4439 | 0.1843 | ||
21.2149 | 0.0070 | 0.3013 | 72.8284 | 54.4206 | 5.4439 | 0.1843 | ||
20.8084 | 0.0074 | 0.3412 | 62.8744 | 54.4206 | 5.4439 | 0.1843 | ||
20.4139 | 0.0078 | 0.3810 | 60.2647 | 54.4206 | 5.4439 | 0.1843 | ||
19.9569 | 0.0082 | 0.4209 | 64.6764 | 54.4206 | 5.4439 | 0.1843 | ||
19.3855 | 0.0086 | 0.4607 | 67.7971 | 54.4206 | 5.4439 | 0.1843 | ||
18.6787 | 0.0090 | 0.5006 | 65.6484 | 54.4206 | 5.4439 | 0.1843 | ||
17.4138 | 0.0094 | 0.5404 | 65.4586 | 54.4206 | 5.4439 | 0.1843 | ||
II | 27.5375 | 0.0016 | 0.1253 | 70.1663 | 11.6575 | 5.1463 | 0.1919 | |
26.5008 | 0.0028 | 0.1767 | 83.1320 | 11.6575 | 5.1463 | 0.1919 | ||
25.4642 | 0.0040 | 0.2280 | 80.1126 | 11.6575 | 5.1463 | 0.1919 | ||
24.4275 | 0.0052 | 0.2794 | 83.9506 | 11.6575 | 5.1463 | 0.1919 | ||
23.3909 | 0.0064 | 0.3308 | 78.3488 | 11.6575 | 5.1463 | 0.1919 | ||
22.3542 | 0.0076 | 0.3822 | 76.4004 | 11.6575 | 5.1463 | 0.1919 | ||
21.3175 | 0.0088 | 0.4335 | 86.6588 | 11.6575 | 5.1463 | 0.1919 | ||
20.2809 | 0.0100 | 0.4849 | 73.0883 | 11.6575 | 5.1463 | 0.1919 | ||
19.2442 | 0.0113 | 0.5363 | 90.4887 | 11.6575 | 5.1463 | 0.1919 | ||
18.2075 | 0.0125 | 0.5877 | 74.8134 | 11.6575 | 5.1463 | 0.1919 |
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Fu, L.; Sharma, R.P.; Zhu, G.; Li, H.; Hong, L.; Guo, H.; Duan, G.; Shen, C.; Lei, Y.; Li, Y.; et al. A Basal Area Increment-Based Approach of Site Productivity Evaluation for Multi-Aged and Mixed Forests. Forests 2017, 8, 119. https://doi.org/10.3390/f8040119
Fu L, Sharma RP, Zhu G, Li H, Hong L, Guo H, Duan G, Shen C, Lei Y, Li Y, et al. A Basal Area Increment-Based Approach of Site Productivity Evaluation for Multi-Aged and Mixed Forests. Forests. 2017; 8(4):119. https://doi.org/10.3390/f8040119
Chicago/Turabian StyleFu, Liyong, Ram P. Sharma, Guangyu Zhu, Haikui Li, Lingxia Hong, Hong Guo, Guangshuang Duan, Chenchen Shen, Yuancai Lei, Yutang Li, and et al. 2017. "A Basal Area Increment-Based Approach of Site Productivity Evaluation for Multi-Aged and Mixed Forests" Forests 8, no. 4: 119. https://doi.org/10.3390/f8040119