FOREST RESOURCES WANAGEMENT ›› 2020›› Issue (2): 126-134.doi: 10.13466/j.cnki.lyzygl.2020.02.019
• Scientific Research • Previous Articles Next Articles
WU Mingshan1(), Zhou Ruliang2, ZHANG Mingsha3, YE Jiangxia3(
)
Received:
2020-01-08
Revised:
2020-04-17
Online:
2020-04-28
Published:
2020-06-15
Contact:
YE Jiangxia
E-mail:wms616@163.com;yjx125@163.com
CLC Number:
WU Mingshan, Zhou Ruliang, ZHANG Mingsha, YE Jiangxia. A Dynamic Assessment of Forest Fire Risk on Stand Scale[J]. FOREST RESOURCES WANAGEMENT, 2020, (2): 126-134.
Tab.1
The weights of forest fire factors of national forest fire rating division standard
火险因子 | 级距 | 权重 |
---|---|---|
难燃类 | 0.04 | |
树种(组)燃烧类别 | 可燃类 | 0.10 |
易燃类 | 0.20 | |
< 0.6 | 0.03 | |
人口密度/(人/hm2) | 0.7~1.3 | 0.14 |
≥1.4 | 0.12 | |
≥53.0 | 0.04 | |
防火期月平均降水量/mm | 52.9~24.6 | 0.11 |
<24.5 | 0.23 | |
< 7.5 | 0.03 | |
防火期月平均气温/(℃) | 7.6~14.0 | 0.15 |
≥14.1 | 0.19 | |
< 1.7 | 0.02 | |
防火期月平均风速/(m/s) | 1.8~2.6 | 0.09 |
≥2.7 | 0.16 | |
<1.5 | 0.04 | |
路网密度/(m/hm2) | 1.6~2.5 | 0.08 |
≥2.6 | 0.05 |
Tab.3
Fire variables and fire risk indicators
火源可及性及火险指标 | 坡度及火险指标 | 坡向及火险指标 | 地表湿润度及火险指标 | |||||||
---|---|---|---|---|---|---|---|---|---|---|
火源可及性x1/m | 火险f(x1) | 坡度x2 | 火险f(x2) | 坡向x3 | 火险f(x3) | 湿润度x4 | 火险f(x4) | |||
<50 | 100 | ≥40 | 100 | 西南向 | 100 | ≥55 | 20 | |||
50~150 | 80 | 40~30 | 75 | 西北向 | 75 | 40~55 | 40 | |||
150~300 | 60 | 30~20 | 45 | 东北向 | 25 | 30~40 | 60 | |||
300~500 | 40 | 20~10 | 30 | 东南向 | 75 | 20~30 | 80 | |||
≥500 | 20 | <10 | 20 | 平地 | 50 | <20 | 100 |
Tab.4
Increase of indicators and fire risk in forest stand under tapping
枯立木增加量及火险增加量指标 | 凋落物增加量及火险增加量指标 | 松脂增加量及火险增加量指标 | 采脂人为活动增加量及火险增加量指标 | |||||||
---|---|---|---|---|---|---|---|---|---|---|
枯立木x5/% | 火险f(x5) | 凋落物x6/% | 火险f(x6) | 松脂x7/% | 火险f(x7) | 人为活动x8/% | 火险f(x8) | |||
<5 | 20 | <5 | 20 | <5 | 20 | <20 | 20 | |||
5~10 | 40 | 5~10 | 40 | 5~10 | 40 | 20~40 | 40 | |||
10~15 | 60 | 10~15 | 60 | 10~15 | 60 | 40~60 | 60 | |||
15~20 | 80 | 15~20 | 80 | 15~20 | 80 | 60~80 | 80 | |||
≥20 | 100 | ≥20 | 100 | ≥20 | 100 | ≥80 | 100 |
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