文献类型：期刊文献

中文题名：川西亚高山暗针叶林土壤温度和水分动态及其与气象因子的关系

英文题名：Soil Temperature and Moisture Dynamics and Their Relationship with Meteorological Factors of Subalpine Dark Coniferous Forest in Western Sichuan,China

作者：赵广东[1,2] 陈健[1,2] 史作民[1,2,3] 杨洪国[4] 许格希[1,2]

第一作者：赵广东

机构：[1]中国林业科学研究院森林生态环境与保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]四川米亚罗森林生态系统定位观测研究站,四川理县623100;[3]南京林业大学南方现代林业协同创新中心,南京210037;[4]中国林业科学研究院湿地研究所,北京100091

年份：2021

卷号：39

期号：2

起止页码：183-193

中文期刊名：山地学报

外文期刊名：Mountain Research

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：中央级公益性科研院所基本科研业务费专项资金(CAFYBB2016MA004,CAFZC2017M004)。

语种：中文

中文关键词：岷江冷杉;土壤体积含水量;随机森林模型;川西;亚高山

外文关键词：Abies fargesii var.faxoniana;soil volume water content;random forest model;Western Sichuan;subalpine region

分类号：S716.3

摘要：暗针叶林是川西亚高山林区的主要森林类型,但目前亚高山暗针叶林气象因子与土壤温度、水分的相关性及其对土壤温度、水分的影响程度尚不清晰。本文运用Pearson相关分析和随机森林模型,分析了2019年川西亚高山暗针叶林土壤温度和体积含水量的动态变化特征及其与气象因子的关系,探讨了气象因子对土壤温度、土壤体积含水量的影响大小。结果表明:(1)5、20和40 cm深度处的土壤平均温度分别为3.97℃、3.82℃和3.80℃,土壤平均体积含水量分别为18.74%、25.08%和12.82%。三个深度处的土壤月平均温度均为1月最低、8月最高,而土壤月平均体积含水量的变化趋势则随深度而不同。(2)在气象因子风速风向、空气温湿度、太阳辐射、光合有效辐射、大气压、降雨量、饱和水汽压差中,除土壤温度与降雨量、土壤体积含水量与风向无显著性相关性(P>0.05)外,三个深度处的土壤温度、体积含水量与其他气象因子均显著相关(P<0.05)。(3)依据随机森林模型的增长均方误差大小,极显著影响5、40 cm深度处土壤温度和三个深度处土壤体积含水量的前四个气象因子均为空气温度、风速、空气相对湿度、大气压(P<0.01),而空气温度、空气相对湿度、风速、大气压则排在极显著影响20 cm深度处土壤温度的前四位(P<0.01)。研究结果可为认识亚高山暗针叶林小气候特征及其对未来环境变化的响应提供参考。
Dark coniferous forest is the main forest type in the subalpine region of Western Sichuan,but the correlation between meteorological factors and soil temperature,soil moisture,their effects on the above two in the subalpine dark coniferous forest are still unclear until now.Soil temperature and volume water content dynamics of dark coniferous forest in western Sichuan in 2019 and their relationship with meteorological factors were studied and the effects of meteorological factors to soil temperature and volume water content was discussed by Random Forest Model.The results showed that:(1)The soil average temperature in the depth of 5 cm,20 cm and 40 cm was 3.97℃,3.82℃,3.80℃,and the soil average volume water content at the same position was 18.74%,25.08%,12.82%,respectively.The soil monthly average temperature in three different depths was the lowest in January and the highest in August,while the change of the monthly average volume water content varied with the soil depths.(2)Among wind speed and direction,air temperature and humidity,solar radiation,photosynthetic active radiation,atmospheric pressure,precipitation and saturated water vapor pressure deficit,except for the correlation between soil temperature and rainfall,soil volume water content and wind direction,the soil temperature and volume water content in the three depths were significantly correlated with other meteorological factors(P<0.05).(3)According to the Increased in Mean Squared Error of Random Forest Model,the first four meteorological factors that significantly affected the soil temperature in the depths of 5 cm and 40 cm and the soil volume water content were air temperature,wind speed,air relative humidity and atmospheric pressure(P<0.01).For the soil temperature in the depths of 20 cm,those were air temperature,air relative humidity,wind speed and atmospheric pressure(P<0.01).The research provides a reference for the microclimatic characteristics of subalpine dark coniferous forest and its response to environmental change in the future.