兴安落叶松过伐林水汽浓度与δ^(18)O变化特征及其对气象因子的响应  

Variation Characteristics of Water Vapor Concentration andδ^(18)O and Its Response to Meteorological Factors in Over-cutting Forest of Larix gmelinii

作　　者：张泽 张秋良[1] 菅亚男 贺晓辉 黄明儒 阿拉木斯 刘喆 关蕾 ZHANG Ze;ZHANG Qiuliang;JIAN Yanan;HE Xiaohui;HUANG Mingru;Alamusi;Liu Zhe;Guan Lei(Forestry College of Inner Mongolia Agricultural University,Hohhot 010019,China;Ordos Ecological Culture Museum,Inner Mongolia,Ordos 017000,China)

机构地区：[1]内蒙古农业大学林学院,内蒙古呼和浩特010019 [2]鄂尔多斯市生态文化博物馆,内蒙古鄂尔多斯017000

出　　处：《内蒙古林业科技》2023年第2期6-11,28,共7页Journal of Inner Mongolia Forestry Science and Technology

基　　金：国家自然科学基金(C030602)。

摘　　要：本研究揭示了兴安落叶松(Larix gmelinii)过伐林不同垂直高度水汽浓度及其氧同位素比值(δ^(18)O)生长季变化特征以及水汽浓度对气象因子的响应特征,为深入探讨兴安落叶松过伐林水交换过程及其机理提供了理论依据。通过使用氢氧稳定同位素技术廓线系统对兴安落叶松过伐林4个垂直高度水汽浓度及其氧同位素进行高频原位观测,同步观测空气温度、相对湿度、太阳辐射、风速、降水量、土壤温度、土壤含水率、饱和蒸汽压差等主要气象因子,采用通径分析法分析气象因子对水汽浓度的影响。结果表明:(1)在不同生长季中,水汽浓度和δ^(18)O都呈单峰型变化趋势。二者最高日均峰值都出现在6—7月,最低日均峰值都出现在10月,二者之间呈极显著正相关关系(P<0.001)。(2)水汽浓度的变化受土壤温度、空气温度、相对湿度、太阳辐射、风速、土壤含水率等气象因子的影响。5 cm土壤温度是控制不同高度水汽浓度变化的主要因子(0.910<PC<0.917)。空气温度对不同高度水汽浓度整体表现为促进作用,风速对不同高度水浓度整体表现为抑制作用。This paper revealed the variation characteristics of growing season for water vapor concentration and itsδ^(18)O at different vertical heights of over-cutting forest of Larix gmelinii and the response of water vapor concentration to meteorological factors,which provided the theoretical basis for the water exchange process and its mechanism in over-cutting forest of Larix gmelinii.High-frequency in-situ observations of water vapor concentration and its oxygen isotopes were carried out at four vertical heights in over-cutting forest of Larix gmelinii using the hydrogen-oxygen stable isotope technique profile system,and these main meteorological factors were simultaneously observed,such as air temperature,relative humidity,solar radiation,wind speed,precipitation,soil temperature,soil water content and saturation vapour pressure.The effect of meteorological factors on water vapor concentration was analyzed by use of path analysis.The results showed that:(1)Both water vapor concentration andδ^(18)O showed a unimodal trend in different growing seasons.The highest daily peaks of water vapor concentration andδ^(18)O were observed from Jun to July and the lowest daily peaks were observed in October,and there was a significantly positive correlation(P<0.001)between them.(2)The variation of water vapor concentration was influenced by meteorological factors,such as Ts,Ta,RH,SR,WS and SWC.Soil temperature at 5 cm was the main factor for controlling water vapor concentration at different heights(0.910<PC<0.917).Air temperature had a direct effect on the overall promotion of water vapor concentration at different heights,while wind speed had a direct effect on the overall suppression of water vapor concentration at different heights.

关 键 词：兴安落叶松 过伐林 水汽浓度 δ^(18)O 环境因子 

分 类 号：S791.222[农业科学—林木遗传育种]