Abstract
Forest structure plays a very important role in the sustainable management of forest resources. Research established 20 plots. The plot area is 900 m2 (30 m × 30 m) for 4 forest types: IIA, IIB, IIIA1 and IIIA3. Results showed that average diameter of four stages is IIA: 11.25 cm; IIB: 12.81 cm; II: 1: 15.94 cm and IIIA3: 20.30 cm. The mixed linear model demonstrated that growth in both diameter and height between forest states was significantly different (P < 0.05). Weibull and J-shape functions can simulate well for 75% of experimental distributions. Path analysis showed that for all four states, direct influence (AHTT) had a greater absolute value than the indirect effect (AHGT). Principal component analysis diagrams showed that for all four types, the quality of forest trees was closely related to canopy width, total height and diameter at breast height. The difference in the quality of the trees between the four states was really significant, as the Sig value of the Chi-square test is 0.000 (less than 0.05). Stages IIA and IIB had mainly species of pioneer species, while IIIA1 and IIIA3 had more shade tolerant species. Stage IIIA3 had the highest level of species diversity.
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Claims 12
Claim · model-written summary
IIA mean diameter was 11.25 cm.
Verbatim
e0“average diameter of four stages is IIA: 11.25 cm; IIB: 12.81 cm; II: 1: 15.94 cm and IIIA3: 20.30 cm.”
t0“forest types”
Claim · model-written summary
IIB mean diameter was 12.81 cm.
Verbatim
e0“average diameter of four stages is IIA: 11.25 cm; IIB: 12.81 cm; II: 1: 15.94 cm and IIIA3: 20.30 cm.”
t0“forest types”
Claim · model-written summary
The third listed state had mean diameter of 15.94 cm.
Verbatim
e0“average diameter of four stages is IIA: 11.25 cm; IIB: 12.81 cm; II: 1: 15.94 cm and IIIA3: 20.30 cm.”
t0“forest types”
Claim · model-written summary
IIIA3 mean diameter was 20.30 cm.
Verbatim
e0“average diameter of four stages is IIA: 11.25 cm; IIB: 12.81 cm; II: 1: 15.94 cm and IIIA3: 20.30 cm.”
t0“forest types”
Claim · model-written summary
Diameter and height growth differed significantly between states.
Verbatim
e0“growth in both diameter and height between forest states was significantly different (P < 0.05).”
t0“forest types”
Claim · model-written summary
Weibull and J-shape functions fit 75% of distributions well.
Verbatim
e0“Weibull and J-shape functions can simulate well for 75% of experimental distributions.”
t0“forest types”
Claim · model-written summary
Direct influence exceeded indirect effect in absolute value.
Verbatim
e0“direct influence (AHTT) had a greater absolute value than the indirect effect (AHGT).”
t0“forest types”
Claim · model-written summary
Tree quality related to canopy width, height and breast-height diameter.
Not reportedDirection
Verbatim
e0“the quality of forest trees was closely related to canopy width, total height and diameter at breast height.”
Claim · model-written summary
Tree quality differed significantly among four states.
Verbatim
e0“The difference in the quality of the trees between the four states was really significant, as the Sig value of the Chi-square test is 0.000 (less than 0.05).”
t0“forest types”
Claim · model-written summary
IIA and IIB mainly contained pioneer species.
Verbatim
e0“Stages IIA and IIB had mainly species of pioneer species”
t0“forest types”
Claim · model-written summary
IIIA1 and IIIA3 had more shade tolerant species.
Verbatim
e0“IIIA1 and IIIA3 had more shade tolerant species.”
t0“forest types”
Claim · model-written summary
IIIA3 had highest species diversity.
Verbatim
e0“Stage IIIA3 had the highest level of species diversity.”
t0“forest types”