Freeze-thaw process induced by increased precipitation affects root growth of alpine steppe on the Tibetan Plateau  

作　　者：QIN Xiao-jing NIE Xiao-jun WANG Xiao-dan HONG Jiang-tao 

机构地区：[1]School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454003,China [2]Key Laboratory of Mountain Environment Evolution and Regulation,Institute and Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 640016,China

出　　处：《Journal of Mountain Science》2023年第10期3010-3017,共8页山地科学学报（英文）

基　　金：funded by the Second Tibetan Plateau Scientific Exploration;the Strategic Priority Research Program of Chinese Academy of Sciences;the National Natural Science Foundation,grant number 2019QZKK0404,XDA20020401,41977284;by the Doctoral Science Foundation of Henan Polytechnic University(B2019-019)。

摘　　要：The response of vegetation productivity to precipitation is becoming a worldwide concern.Most reports on responses of vegetation to precipitation trends are based on the growth season.In the soil freeze/thaw process,the soil water phase and heat transport change can affect root growth,especially during the thawing process in early spring.A field experiment with increased precipitation(control,increased 25%and increased 50%)was conducted to measure the effects of soil water in early spring on above-and below-ground productivity in an alpine steppe over two growing seasons from June 2017 to September 2018.The increased 50%treatment significantly increased the soil moisture at the 10 cm depth,there was no difference in soil moisture between the increased 25%treatment and the control in the growing season,which was not consistent in the freeze/thaw process.Increased soil moisture during the non-growing season retarded root growth.Increased precipitation in the freezing-thawing period can partially offset the difference between the control and increased precipitation plots in both above-and below-ground biomass.

关 键 词：Freeze-thaw process PRECIPITATION Root length Plant coverage Alpine grassland 

分 类 号：S812[农业科学—草业科学]