Distinguishing Phyllostachys edulis Age Based on Laser Scanning Intensity

Fig. 4. Laser intensity of trunks with different ages (data followed by different capital letters represents difference less than 0.05 significance level between trunks, lowercase letters represent difference less than 0.05 significance level in trunks). (a) 1-year old trunks; (b) 2-year old trunks; (c) 3-year old trunks; (d) 4-year old trunks

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Fig. 5. Relationship between laser intensity and trunks with different ages

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Table 1. Original and corrected intensity of 1-year bamboo

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Table 1. Original and corrected intensity of 1-year bamboo

Trunk		1	2	3	4	5	6	7	8	9	10
Mean	Original	0.19550	0.20057	0.20004	0.20082	0.19290	0.19367	0.18817	0.18959	0.18539	0.18744
	Corrected	0.20029	0.20051	0.20041	0.20377	0.19545	0.19410	0.18857	0.18963	0.18488	0.18549
STD	Original	0.00751	0.01009	0.00433	0.00970	0.00773	0.01273	0.00943	0.01427	0.00918	0.01255
	Corrected	0.00409	0.00600	0.00241	0.00626	0.00311	0.01117	0.00713	0.01200	0.00723	0.01120
R /m	Min	0.98312	0.91759	0.90735	0.91809	1.00426	1.14075	1.32969	1.57238	1.59021	2.12243
	Max	3.84223	3.83117	3.82360	3.81774	3.82995	3.84632	3.87853	3.91175	3.96568	4.02894
cosθ	Min	0.93120	0.95788	0.99776	0.97301	0.88408	0.77073	0.65525	0.54901	0.50898	0.41366
	Max	0.99349	0.99695	0.99920	1.00000	0.99965	0.99624	0.98982	0.98261	0.97320	0.96050
P_s /m^-2	Min	0.06730	0.06792	0.06835	0.06861	0.06815	0.06734	0.06580	0.06422	0.06188	0.05917
	Max	0.96345	1.13766	1.21193	1.15437	0.87660	0.59227	0.37060	0.22206	0.20128	0.09183

Table 2. Significance analysis of laser intensity in trunks with different ages
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Table 2. Significance analysis of laser intensity in trunks with different ages
Source Sum of squaresof type III d_f Meansquare F p
Age 0.008 3 0.003 34.265 0
Trunk 0.003 9 0 4.123 0
Age×Trunk 0.001 27 0 0.640 0.914
Error 0.013 160 0
Total 8.225 200

Table 3. Significance analysis of laser intensity in trunks and between trunks with different ages

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Table 3. Significance analysis of laser intensity in trunks and between trunks with different ages

Source	1-year		2-year		3-year		4-year
Source	f	p	f	p	f	p	f	p
Between-trunks	8.701	<0.001	9.098	<0.001	4.608	<0.001	1.283	0.253
In-trunks	4.680	0.011	8.216	<0.001	1.095	0.338	0.380	0.685
Between-trunks×in-trunks	0.169	1.000	0.122	1.000	0.070	1.000	0.160	1.000

Table 4. Parameters and r2 for fitting laser intensity of trunks with different ages
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Table 4. Parameters and r2 for fitting laser intensity of trunks with different ages
Parameter and r² 1-year 2-year 3-year 4-year
K₀ -0.0001 -0.0006 -0.0003 -0.0001
K₁ -0.0080 0.0061 0.0019 0.0002
K₂ 0.2026 0.1870 0.2056 0.2153
r² 0.9280 0.9655 0.9892 0.9577

Table 5. Results of distinguishing bamboo age
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Table 5. Results of distinguishing bamboo age
Age Number ofmeasuredbamboos Number ofaccuratelydistinguishedbamboos Accuracy /%
1 10 9 90
2 10 8 80
3 10 10 100
4 10 10 100

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Cai Yue, Xu Wenbing, Liang Dan, Deng Susu, Li Chong. Distinguishing Phyllostachys edulis Age Based on Laser Scanning Intensity[J]. Chinese Journal of Lasers, 2018, 45(1): 110003

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