JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (1): 189-196.doi: 10.12302/j.issn.1000-2006.202005008
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WANG Lujun1(), CAI Chunju1,2,*(), TANG Xiaolu3, FAN Shaohui1
Received:
2020-05-07
Accepted:
2020-06-25
Online:
2021-01-30
Published:
2021-02-01
Contact:
CAI Chunju
E-mail:wuatang@icbr.ac.cn;caicj@icbr.ac.cn
CLC Number:
WANG Lujun, CAI Chunju, TANG Xiaolu, FAN Shaohui. Aboveground biomass allocation patterns and model construction of Bambusa rigida[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2021, 45(1): 189-196.
Table 1
Site conditions and stand status"
编号 No. | 海拔/m altitude | 坡度/(°) slope | 坡向 aspect | 丛密度/ (丛·hm-2) clump density | 丛株数 quantity | 平均株高/m mean plant height | 平均胸径/cm mean DBH |
---|---|---|---|---|---|---|---|
1 | 300 | 30 | 阳坡 | 907 | 7.6 | 12.03±1.89 | 4.83±0.73 |
2 | 312 | 35 | 阳坡 | 852 | 8.3 | 11.78±2.01 | 4.89±0.79 |
3 | 333 | 33 | 阳坡 | 1 500 | 7.0 | 12.35±2.45 | 4.85±0.75 |
4 | 290 | 28 | 阳坡 | 1 425 | 7.2 | 12.30±2.35 | 4.85±0.73 |
5 | 325 | 29 | 阳坡 | 852 | 7.5 | 12.55±2.20 | 4.90±0.83 |
Table 4
Comparisons of evaluation indexes of different independent variables"
自变量 independent variable | 单株single bamboo | 秆 stalk | 枝 branch | 叶 leaf |
---|---|---|---|---|
D | 0.845~0.950 | 0.834~0.945 | 0.750~0.832 | 0.567~0.724 |
D2 | 0.843~0.924 | 0.837~0.917 | 0.657~0.760 | 0.570~0.646 |
DH | 0.818~0.973 | 0.807~0.975 | 0.701~0.821 | 0.546~0.714 |
D2H | 0.660~0.971 | 0.647~0.971 | 0.574~0.831 | 0.480~0.722 |
Table 5
The biomass model of single bamboo and various organs aboveground"
竹龄/a bamboo age | 器官 organ | 函数类型 model type | 自变量 independent variable | 方程 fitting equation | R2 | RMSE/kg | MAE/kg |
---|---|---|---|---|---|---|---|
全竹龄 whole age classes | 单株 | 幂函数 | DH | W=0.11 4(DH)1.411 1 | 0.973** | 0.177 | 0.136 |
单株 | 幂函数 | D | W=0.107 0D2.334 1 | 0.950** | 0.240 | 0.185 | |
竹秆 | 幂函数 | DH | W=0.007 6(DH)1.489 1 | 0.975** | 0.180 | 0.141 | |
竹秆 | 幂函数 | D | W=0.081 1D2.450 0 | 0.946** | 0.264 | 0.202 | |
竹枝 | 幂函数 | D | W=0.015 2D-4.188 5 | 0.832** | 0.355 | 0.266 | |
竹叶 | 幂函数 | D | W=0.008 8D1.545 7 | 0.724** | 0.429 | 0.355 | |
1 | 单株 | 幂函数 | D2H | W=0.032 9D2H0.846 7 | 0.954** | 0.233 | 0.180 |
单株 | 幂函数 | D | W=0.114 8D2.308 3 | 0.945** | 0.253 | 0.199 | |
竹秆 | 幂函数 | D2H | W=0.021 1D2H0.909 1 | 0.965** | 0.217 | 0.174 | |
竹秆 | 幂函数 | D | W=0.081 8D2.467 1 | 0.948** | 0.264 | 0.203 | |
竹枝 | 幂函数 | D | W=0.014 5D1.827 2 | 0.833** | 0.368 | 0.273 | |
竹叶 | 幂函数 | D | W=0.007 9D1.654 3 | 0.769** | 0.408 | 0.331 | |
2 | 单株 | 多项式 | D2H | W=0.199 5+0.016 2D2H+ 0.000 004(D2H2) | 0.955** | 0.583 | 0.422 |
单株 | 幂函数 | D2 | W=2.334 4D0.120 0 | 0.944** | 0.181 | 0.138 | |
竹秆 | 多项式 | D2H | W=0.191 6+0.012 9D2H+ 0.000 000 2(D2H)2 | 0.964** | 0.456 | 0.322 | |
竹秆 | 幂函数 | D2 | W=2.415 1D0.088 9 | 0.938** | 0.198 | 0.153 | |
竹枝 | 幂函数 | D | W=0.016 7D2.183 | 0.774** | 0.365 | 0.290 | |
竹叶 | 多项式 | DH | W=0.115 8+0.003 9DH+ 0.000 08(DH)2 | 0.863** | 0.056 | 0.043 | |
竹叶 | 幂函数 | D | W=2.438D0.004 8 | 0.807** | 0.370 | 0.298 | |
3 | 单株 | 幂函数 | DH | W=0.027 6DH1.258 7 | 0.951** | 0.220 | 0.153 |
单株 | 幂函数 | D | W=0.124 3D2.366 3 | 0.932** | 0.259 | 0.169 | |
竹秆 | 幂函数 | DH | W=0.017 5DH1.320 2 | 0.964** | 0.196 | 0.137 | |
竹秆 | 幂函数 | D | W=0.056D2.475 5 | 0.940** | 0.253 | 0.178 | |
竹枝 | 幂函数 | D | W=0.349 6D1.786 2 | 0.814** | 0.353 | 0.294 | |
竹叶 | 指数函数 | D | W=0.009 1e0.629 1D | 0.791** | 0.472 | 0.387 |
Table 6
Comparison of the fitting effect between whole age classes and different age classes"
竹龄 bamboo age | 器官organ | R2 | RMSE/kg | MAE/kg |
---|---|---|---|---|
全竹龄 whole age | 单株single bamboo | 0.660~0.973 | 0.177~0.627 | 0.136~0.484 |
竹秆stalk | 0.647~0.975 | 0.180~0.673 | 0.141~0.518 | |
竹枝branch | 0.574~0.832 | 0.057~0.565 | 0.043~0.411 | |
竹叶leaf | 0.480~0.724 | 0.033~0.588 | 0.026~0.492 | |
不同竹龄 different age | 单株single bamboo | 0.654~0.955 | 0.233~0.769 | 0.180~0.589 |
竹秆stalk | 0.644~0.965 | 0.217~0.688 | 0.169~0.544 | |
竹枝branch | 0.633~0.833 | 0.173~0.601 | 0.133~0.440 | |
竹叶leaf | 0.535~0.863 | 0.027~0.444 | 0.021~0.295 |
Table 7
Biomass allocation situation of stand in different age classes"
竹龄/a bamboo age | 立竹密度/ (株·hm-2) quantity | 林分生物量/(t·hm-2) biomass | |||
---|---|---|---|---|---|
秆 stalk | 枝 branch | 叶 leaf | 总生物量 total biomass | ||
1 | 2 930±456 b | 11.408±2.274 b (91.61、33.68) | 0.740±0.167 b (5.94、19.71) | 0.305±0.064 c (2.45、22.10) | 12.560±2.505 b (100、31.92) |
2 | 3 641±580 a | 15.658±5.602 a (85.13、46.23) | 2.017±0.721 a (10.97、53.69) | 0.717±0.256 a (3.90、51.96) | 18.407±6.580 a (100、47.15) |
3 | 1 681±334 c | 6.805±1.552 c (83.36、20.09) | 1.000±0.354 c (12.25、26.62) | 0.358±0.154 b (4.39、25.94) | 8.163±2.450 c (100、20.93) |
总量 | 8 252±1 488 | 33.871±8.353 (86.83、100) | 3.757±0.909 (9.63、100) | 1.380±0.332 (3.54、100) | 39.008±9.593 (100、100) |
Table 8
Biomass allocation situation of stand in different diameter classes"
径级/cm diameter | 竹林密度/ (株·hm-2) density | 平均株高/m mean height | 林分生物量/(t·hm-2) stand biomass | |||
---|---|---|---|---|---|---|
秆 stalk | 枝 branch | 叶 leaf | 总生物量 total biomass | |||
1.6~2.5 | 111±47 e | 6.40 e | 0.047±0.024 d (80.73 b、0.14 d) | 0.008±0.003 c (14.04 a、0.21 c) | 0.003±0.001 c (2.74 b、0.22 c) | 0.058±0.028 c (100、0.15 c) |
2.6~3.5 | 314±88 d | 10.08±2.35 d | 0.442±0.118 c (85.75 a、1.30 c) | 0.054±0.017 c (10.29 b、1.44 c) | 0.021±0.005 c (3.95 a、1.52 c) | 0.517±0.140 c (100、1.33 c) |
3.6~4.5 | 1 948±616 b | 12.21±2.89 c | 5.402±1.830 b (86.19 a、15.95 b) | 0.635±0.212 b (10.15 b、16.90 b) | 0.228±0.074 b (3.65 a、16.52 b) | 6.265±2.116 b (100、16.06 b) |
4.6~5.5 | 4 589±1 742 a | 13.73±3.44 b | 21.265±6.237 a (87.10 a、62.78 a) | 2.311±0.708 a 9.45 b、61.51 a | 0.844±0.254 a (3.45 a、61.16 a) | 24.420±7.195 a (100、62.60 a) |
5.6~6.5 | 1 081±333 c | 15.07±4.10 a | 6.715±2.209 b (86.61 a、19.83 b) | 0.749±0.233 b (9.73 b、19.94 b) | 0.284±0.099 b (3.66 a、20.58 b) | 7.748±2.537 b (100、19.86 b) |
总量 | 8 043±1 827 | 12.02±3.12 | 33.871±8.353 (86.83、100) | 3.757±0.909 (9.63、100) | 1.380±0.332 (3.54、100) | 39.008±9.593 (100、100) |
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