Thinning- and tree-growth-caused changes in canopy cover and stand height and their estimation using low-density bitemporal airborne lidar measurements - a case study in hemi-boreal forests

被引：5

作者：

Arumae, Tauri ^{[1
,2
]}

Lang, Mait ^{[1
,3
]}

Laarmann, Diana ^{[1
]}

机构：

[1] Estonian Univ Life Sci, Forest Management Planning & Wood Proc Technol, Kreutzwaldi 5, EE-51014 Tartu, Estonia

[2] Estonian State Forest Management Ctr, Forest Survey Management Div, Tallinn, Laane Viru Coun, Estonia

[3] Univ Tartu, Fac Sci & Technol, Tartu Observ, Tartu, Tartu County, Estonia

来源：

EUROPEAN JOURNAL OF REMOTE SENSING | 2020年 / 53卷 / 01期

关键词：

Change detection; commercial thinning; forest management; forest height increment; canopy cover; repeated airborne laser scanning; SCOTS PINE; MULTITEMPORAL LIDAR; ABOVEGROUND BIOMASS; SITE INDEX; FIELD; INTENSITY; METRICS;

D O I：

10.1080/22797254.2020.1734969

中图分类号：

TP7 [遥感技术];

学科分类号：

081102 ; 0816 ; 081602 ; 083002 ; 1404 ;

摘要：

Repeated airborne laser scanning (ALS) measurements during leaf-on and leaf-off phenophases were studied. A 15 km x 15 km test site located in northern Estonia was used that included a reference set of stands, and 870 stands with thinning carried out before, between, and after two ALS flights. The decrease in ALS-based canopy cover estimate (CCALS) caused by thinning was similar for the leaf-off and leaf-on phenophases, and for different height thresholds. The point cloud height percentile (H-Px) values increased in almost all thinned stands, and the increase was present for the leaf-off and leaf-on phenophases. ALS point cloud metrics (skewness, kurtosis, mode, and canopy relief ratio) showed no response to thinning (p-value >0.05). Stand-dominating species had no significant influence onH(Px)increment orCC(ALS)change using the leaf-on data (p-value >0.05). The minimum height filter for pulse return selection had a substantial influence onH(Px)increment in stands thinned between the two ALS measurements. Ground points are usually excluded fromH(Px)calculation, but for stand-level analyses, their inclusion can provide additional information.

引用

页码：113 / 123

页数：11