Effects of Passive Warming on Atmospheric and Soil Temperature and Humidity Environment in the Northern Forest Region of the Greater Khingan Mountains
In order to explore the response of soil and atmospheric temperature and humidity to climate warming,the open-top chamber simulation warming method was used to set up control groups(CK)and warming groups(OTC)in experiments.The experiments were carried out in 2023 within the experimental area of the Greater Khingan Mountains National Forest Ecological Station in Genhe,Hulun Buir,Inner Mongolia,to analyze the effects of simulated warming on the temperature and humidity of the atmosphere and soil at various depths(5,10,15,20 cm)in Larix gmelinii forest.The results showed that:(1)Compared with CK,the soil temperature of each soil layer(5,10,15,20 cm)in OTC increased by 1.97,1.39,0.41℃and 3.94℃,,and the atmospheric temperature increased by 1.14℃.The soil moisture at various soil depths(5,10,20 cm)decreased by 1.33%,2.52%and 3.58%,respectively.The soil moisture of soil layer at 15 cm increased by 3.04%,and the atmospheric humidity decreased by 3.49%.(2)The atmospheric temperature and the soil temperature of each soil layer in OTC were higher than those in CK in each season.The increases in soil and atmospheric temperatures were greatest in summer and smallest in winter.There were significant differences in temperatures of 20 cm soil layer in spring and winter under simulated warming treatment.The decrease of soil moisture in OTC was greatest in summer and smallest in winter,while the decrease of atmospheric humidity was greatest in summer and smallest in spring.(3)The monthly average temperature of atmosphere and soil showed a trend of'rising first and then decreasing'under different treatments,and the atmospheric temperatures in OTC were higher than those in CK each month.The soil moisture varied significantly from April to October and less so from November to March the next year.(4)Temperature and humidity were positively correlated and affected by soil depth.
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