Analysis on Temporal and Spatial Patterns of Forest Fire Intensity in the Greater Xing'an Mountains Based on Landsat Images

doi:10.13466/j.cnki.lyzygl.2019.06.016

Abstract

Abstract:

Based on the landsat5 TM data and local fire record information of the Greater Xing'an mountains from 1988 to 2009,the continuous fire spot data were obtained under the envi5.3 platform,and the dNBR index of fire spot data was established.The results showed that the number of forest fires and over-fire area in the Greater Xing'an mountains area increased from 1988 to 2009.Before the implementation of the Natural Forest Protection Project(NFPP) in 1998,the forest fires in the area were primarily low-intensity fires.After 1998,however,the ratio of low-intensity fires decreased significantly(P<0.05) while the high intensity fires increased significantly(P<0.01).The mean maximum temperature was positively correlated with high severity fire(P<0.05) but significant negative correlation with low intensity fire(P<0.05),monthly mean wind speed and high intensity fire showed a significant negative correlation,(P<0.05),there was a significant positive correlation with low intensity fire(P<0.05).From the results of this research we speculated that the implementation of the NFPP is the main driving force of the changed of fire severity.

Key words: Greater Xing'an mountains, remote sensing, fire intensity, dNBR index, Natural Forest Protection Project

CLC Number:

YUAN Hao, CHEN Hongwei, QI Lin, FANG Lei, QIAO Zeyu, ZHAO Fuqiang. Analysis on Temporal and Spatial Patterns of Forest Fire Intensity in the Greater Xing'an Mountains Based on Landsat Images[J]. FOREST RESOURCES WANAGEMENT, 2019, (6): 91-96.

Figures/Tables 5

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气象数据	Mean±SD	样本数/个	与林火烈度相关性(r)
气象数据	Mean±SD	样本数/个	高烈度火	中烈度火	低烈度火
最低气温(℃)	-4.87±8.31	63	0.248^*	-0.091	-0.192
最高气温(℃)	28.81±6.11	63	0.290^*	0.035	-0.278^*
平均气温(℃)	11.26±6.85	63	0.305^*	-0.110	-0.237
最低气压(hPa)	946.58±12.27	63	0.033	0.098	-0.067
最高气压(hPa)	975.27±14.39	63	-0.126	0.064	0.090
平均气压(hPa)	962.87±13.13	63	-0.078	0.053	0.051
平均降水(mm)	57.09±47.59	63	0.081	-0.014	-0.068
降水量≥0.1mm日数(d)	10.78±4.41	63	0.002	-0.192	0.071
最大日降水量(mm)	18.56±12.70	63	0.062	0.032	-0.069
平均相对湿度(%)	62.41±11.08	63	0.196	-0.221	-0.096
平均风速(m/s)	2.40±0.60	63	-0.256^*	-0.126	0.281^*
最大风速(m/s)	10.81±1.84	63	-0.127	-0.115	0.160
日照时数(h)	247.42±38.07	63	0.201	0.179	-0.251^*
月日照百分率(%)	54.92±8.90	63	0.118	0.246	-0.201
平均水气压(hPa)	9.12±4.66	63	0.316^*	-0.134	-0.237