广西喀斯特地区植被NPP对高低温气象灾害的响应

doi:10.19692/j.issn.1006-1126.20240110

摘要/Abstract

摘要： 高低温气象灾害对广西喀斯特地区石漠化治理和植被修复产生较大威胁。基于2000—2021年广西喀斯特地区植被净初级生产力指数（Net Primary Productivity,NPP）和气温资料,采用线性趋势法、GIS空间分析法和相关性分析法,分析广西喀斯特地区植被NPP变化趋势和高低温气象灾害对植被NPP的影响。结果表明,2000—2021年,研究区植被NPP增加趋势明显,增长速率为84.7 gC·m^-2/10a,增加区域面积占比为90.4%,东北和中部地区增加较明显。所有高温灾害指数,包括≥35 ℃日数、≥37 ℃日数、≥35 ℃积温、≥37 ℃积温和最高气温,对植被NPP均以弱负影响为主;低温灾害指数中,≤0 ℃积温和最低气温对植被NPP均以弱负影响为主,≤0 ℃日数以弱正影响为主。高温灾害对研究区中部植被NPP的负影响较强,低温灾害对植被NPP的负影响强度在不同指数间差异较大。高温灾害对各林种NPP的负影响强度和范围多大于低温灾害。发生高温灾害时,竹林NPP受其负影响的强度大于其他林种,桉树类NPP受其负影响的范围大于其他林种,平均面积占比约78.0%。发生低温灾害时,桉树类NPP受其负影响的强度大于其他林种,阔叶林NPP受其负影响的范围大于其他林种,平均面积占比约53.5%。

关键词: 喀斯特地区植被, NPP, 气象灾害, 高温, 低温, 广西

Abstract: High and low temperature meteorological disasters create significant menace for rocky desertification control and vegetation restoration in Guangxi karst areas. Based on vegetation NPP and temperature data from 2000 to 2021 in Guangxi karst areas, change trends of vegetation NPP and effects of high and low temperature meteorological disasters on vegetation NPP were analyzed by linear trend method, GIS spatial analysis method and correlation analysis method. Results showed that vegetation NPP increased significantly with growth rate of 84.7 gC·m^-2/10a and increasing area accounting for 90.4% from 2000 to 2021. Increasing trends were more obvious in northeast and center of study areas. All indexes of high temperature disasters had weakly negative effects on vegetation NPP, including ≥35 ℃ days, ≥37 ℃ days, ≥35 ℃ accumulated temperature, ≥37 ℃ accumulated temperature and maximum temperature. For indexes of low temperature disasters, ≤0 ℃ accumulated temperature and minimum temperature had weakly negative effects and ≤0 ℃ days had weakly positive effect on vegetation NPP. High temperature disasters had relatively strong negative effects on vegetation NPP in middle of study area, while low temperature disasters had different negative effects on vegetation NPP among different indexes. High temperature disasters had greater negative effects on vegetation NPP of different forest species than low temperature disasters in terms of intensity and range. When high temperature disasters occurred, negative effect intensity for bamboo forest NPP was greater than those for other forest species, and negative effect range for eucalypt forest NPP was greater than those for other forest species, with average area accounting for 78.0%. When low temperature disasters occurred, negative effect intensity for eucalypt forest NPP was greater than those for other forest species, and negative effect range for broad-leaved forest NPP was greater than those for other forest species, with average area accounting for 53.5%.

Key words: vegetation in karst area, net primary productivity, meteorological disaster, high temperature, low temperature, Guangxi

中图分类号:

S716

陈燕丽, 李明志, 谢映, 莫伟华, 罗永明. 广西喀斯特地区植被NPP对高低温气象灾害的响应[J]. 广西林业科学, 2024, 53(1): 71-79.

Chen Yanli, Li Mingzhi, Xie Ying, Mo Weihua, Luo Yongming. Responses of Vegetation NPP to High and Low Temperature Meteorological Disasters in Guangxi Karst Areas[J]. GUANGXI FORESTRY SCIENCE, 2024, 53(1): 71-79.

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