滇中高原火后更新森林植物和土壤水分含量的时空格局（英文）

编号 zgly0001675800

文献类型 期刊论文

文献题名 滇中高原火后更新森林植物和土壤水分含量的时空格局（英文）

作者 陈丽芳  窦群  张志明  沈泽昊 

作者单位 InstituteofEcology  CollegeofUrbanandEnvironmentalScience  theMOELaboratoryofEarthSurfaceProcesses  PekingUniversity  GraduateSchoolofLifeandEnvironmentalSciences  UniversityofTsukuba  CollegeofEcologyandEnvironment  YunnanUnive 

母体文献 Journal of Geographical Sciences 

年卷期 2019年07期

年份 2019 

分类号 S718.5  S714.2 

关键词 plantmoisturecontent  soilmoisturecontent  topography  season  soiltemperature  yearsincelastfire  droughtstress 

文摘内容 Plant moisture content(PMC) is used as an indicator of forest flammability, which is assumed to be affected by climate drought. However, the fire-induced drought stress on PMC and its spatial and temporal variations are unclear. Based on a parallel monitoring experiment from 2014 to 2015, this study compared the PMCs and soil moisture contents(SMC) at five post-fire sites in central Yunnan Plateau, Southwest China. The number of years since last fire(YSF), season, topographic position, plant species and tissue type(leaf and branch) were selected as causal factors of the variations in PMC and SMC. A whole year parallel monitoring and sampling in the post-fire communities of 1, 2, 5, 11 and 30 YSF indicated that drought stress in surface soils was the strongest in spring within the first 5 years after burning, and the SMC was regulated by topography, with 64.6% variation in soil moisture accounted for by YSF(25.7%), slope position(22.1%) and season(10.8%). The temporal variations of PMC and SMC differed at both interannual and seasonal scales, but the patterns were consistent across topographic positions. PMC differed significantly between leaves and branches, and among three growth-forms. The mean PMC was lower in broad-leaved evergreen species and higher in conifer species. Season and soil temperature were the primary determinants of PMC, accounting for 19.1% and 8.3% of variation in PMC, respectively. This indicated phenology-related growth rather than drought stress in soil as the primary driver of seasonal changes in PMC. The significant variations of PMC among growth forms and species revealed that seasonal soil temperature change and dominant species in forest communities are useful indicators of fire risk assessment in this region.