Remote sensing estimation of plantation canopy closure based on 4-Scale model

HE Ping, YU Ying, FAN Wenyi, YANG Xiguang

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1) : 23-30.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1) : 23-30. DOI: 10.12302/j.issn.1000-2006.202108045

Remote sensing estimation of plantation canopy closure based on 4-Scale model

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Abstract

【Objective】 Canopy closure is important for forest management planning. To find methods and models for estimating canopy closure that are less affected by the region, with higher accuracy and better robustness, the study adopted a 4-Scale geometric-optical model to estimate the canopy closure of plantations. 【Method】 Wangyedian Forest Farm in Inner Mongolia and Gaofeng Forest Farm in Guangxi Autonomons Region were selected as the study areas. First, a parameter sensitivity analysis of the 4-Scale model was performed, and the canopy gap fraction Pvg_c (the gap fraction when the canopy was a rigid body) and Pvg (the gap fraction of the gaps in a crown were considered) under different sensitivity parameters were simulated. Then, a one-to-one correspondence database of Pvg_c, Pvg and the sensitivity parameters was established. Second, statistical relationship models between Pvg_c and Pvg and the sensitivity parameters were established based on the database. Then, Pvg_c and Pvg were estimated based on the sensitivity parameters, and the stand canopy closure was estimated. Finally, the canopy closure measured by the transects and the fish eye camera measurement method were used to test the canopy closure based on Pvg_c and Pvg respectively. 【Result】 The accuracy of plantation canopy closure estimated by Pvg_c and Pvg was 88.17% and 92.8%, respectively. Pvg_c had a higher correlation with the number of trees and crown radius. The R2 and RMSE values of the model are 0.814 and 0.043, respectively. The correlation between Pvg and LAI was high, and the R2 and RMSE of the model were 0.795 and 0.040, respectively. 【Conclusion】 Both Pvg_c and Pvg can be used to estimate canopy closure in plantations. Although Pvg has higher accuracy in estimating canopy closure, the estimated canopy closure is not the canopy closure defined in forestry. Canopy closure is defined as the ratio of the vertical projection area of the canopy when it is a rigid body. Therefore, the use of Pvg_c to estimate the canopy closure of plantations was more accurate. To obtain the number of trees and radius of the crown, Pvg_c was used to estimate the canopy closure of the plantation.

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4-Scale model / canopy closure / fisheye camera / transects / leaf area index (LAI)

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HE Ping , YU Ying , FAN Wenyi , et al. Remote sensing estimation of plantation canopy closure based on 4-Scale model[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2023, 47(1): 23-30 https://doi.org/10.12302/j.issn.1000-2006.202108045

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