Research on the Plot Survey and Load Estimation of National Forest Fuels

doi:10.13466/j.cnki.lyzygl.2022.06.001

Abstract

Abstract:

From the viewpoint of tediousness and professionalism of forest fuel load investigation,a stratified sampling system for the plot survey of forest fuel loads at national and provincial scale were developed based on five commonly used indicators,namely vegetation area,tree species,stand origin,age group and canopy density.Within each specific plot,the fuel loads of tree-layer can be estimated by using the data of individual tree survey combined with the algometric biomass model or the biomass expansion factor,while fuel loads of shrub-,herb-,litter- and humus-layer should be jointly estimated by the quadrat survey and the data of sample moisture content.This method has important guidance and reference significance for the survey and estimation of forest fuel loads at national or regional scale.

Key words: forest fuel, plot survey, estimation model, stratified sampling, fuel load

CLC Number:

S762.1

YANG Xueqing, SUN Zhichao, CHAI Zheng, QIU Yiwen, JIANG Chunying. Research on the Plot Survey and Load Estimation of National Forest Fuels[J]. FOREST RESOURCES WANAGEMENT, 2022, 0(6): 1-6.

Figures/Tables 3

Tab.1

Fig.1

Tab.2

References 11

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序号	调查因子	允许误差
1	样地号、地理范围、所属分区、样地面积及形状、地貌、地形、群落类型、优势树种、龄组、起源、土壤、干扰情况、经营措施、生长状况、枯立木分解状态、枯倒木的密度级、灌木优势种、建群草种名、枯落物类型、胸径≥8.0cm的活立木株数	无误
2	海拔	±10m
3	郁闭度	±0.1
4	平均树高、平均胸径、林分密度、灌木株数、枯倒木材积、草本盖度、灌木盖度、灌木鲜重	±10%
5	树种组成	1成
6	胸径<8.0cm的活立木株数、草本、枯落物载量	±5%
7	腐殖质载量	±10%
8	灌木平均冠幅	±0.1m
9	灌木平均地径	±0.1cm
10	灌木层优势植被平均高	≤1.5m,0.1m;>1.5m,±10%

序号	名称	内容	单位
1	优势种名	记录灌木层植被的优势种
2	平均高	记录灌木层优势层植被平均高	m
3	平均冠幅	丛状灌木冠幅平均值,冠幅大小为东西、南北的冠长平均	m
4	平均地径	记录灌木植株和未达到起测直径的乔木距地面10厘米距离处的平均直径	cm
5	株数/丛数	样方内灌木总株数(高度>30cm)或丛数	株/丛
6	平均盖度	灌木层垂直投影覆盖面积与样方面积的比例	%
7	样方灌木鲜重	称量样方内所有标准灌木地上部分鲜重	g
8	灌木样品鲜重	称量灌木样品的地上部分鲜重	g
9	灌木样品干重	称量灌木样品烘干重量	g
10	样地可燃物载量	基于样方鲜重、样方灌木数量和样品干鲜比数据,计算样方可燃物载量,换算成单位面积可燃物载量	t/hm²

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