生态学杂志2024，Vol.43Issue(3)：682-693,12.DOI:10.13292/j.1000-4890.202403.001
藏东南色季拉两种树线交错带及其不同生境的小气候特征
Microclimate characteristics of two treeline ecotones and their different habitats in Segera,southeast Tibet
摘要
Abstract
This work described the microclimate characteristics of Sygera alpine treeline ecotones,and provided basic data for further study of alpine treeline maintenance mechanisms.Based on the data of automatic weather sta-tions in two treeline ecotones(Abies georgei var.smithii treeline and Juniperus saltuaria treeline)and the observa-tions of temperature and humidity of air and soil in different habitats of both ecotones in the Sygera Mountain during 2018-2020,we analyzed the microclimatic characteristics of treeline ecotones and the variation characteristics of hydrothermal conditions of the three habitats(under forest,shrub,and forest gap).In both ecotones,mean tem-perature of the warmest month was 8.71-9.32 ℃.The mean temperature for the coldest month ranged from-7.23 to-9.08 ℃.The annual mean temperature was 0.55-0.88 ℃.The annual temperature difference was 15.95-18.40℃.The annual biological temperature was 2.79-3.33 ℃.The warm index was 9.15-12.94 ℃·month-1 and the cold index ranged from-60.22 to-64.98 ℃·month-1.The mean temperature and length of the growing season de-fined by air temperature were 7.45-8.31 ℃ and 106-136 days,while those defined by 10 cm soil temperature were 6.06-7.01 ℃ and 120-141 days,respectively.Air temperature and humidity in the different habitats of the two ecotones were similar,whereas soil temperature and moisture were highest in the forest gap,with large daily ampli-tude of soil temperature.Soil temperature in the forest was lower than that of the other habitats,with a"cool foot"effect.The growing season defined by soil temperature lagged behind that defined by air temperature by about one month.The average air temperature,average soil temperature,and soil water content of the forest gaps were higher.The freezing injury events in the forest gaps and shrubs were frequent,strong,and lasting.The differences in mi-croclimate characteristics among different habitats in the treeline ecotones of Sygera Mountain were mainly reflected in soil temperature,growing season temperature,and occurrence of freezing injury events in the growing season.关键词
色季拉山/树线交错带/气候指标/温度/生长季Key words
Sygera Mountain/treeline ecotone/climate indicator/temperature/growth season引用本文复制引用
陈文盛,丁慧慧,李江荣,付芳伟,李月瑶,肖思颖..藏东南色季拉两种树线交错带及其不同生境的小气候特征[J].生态学杂志,2024,43(3):682-693,12.基金项目
西藏自治区自然科学基金项目"藏东南林线微气候特征及其对天然更新的影响"(XZ208ZR G-16)、西藏林芝森林生态站辐射基准站与冻土自动监测系统建设(502219001)、西藏高原森林生态教育部重点实验室开放课题(XZA-JYBSYS-2021-Y10)和西藏自治区科技创新基地自主研究项目(XZ2022JR0007G)资助. （XZ208ZR G-16）
