Degradation leads to dramatic decrease in topsoil but not subsoil root biomass in an alpine meadow on the Tibetan Plateau, China

作     者：ZHANG Zhenchao LIU Miao SUN Jian WEI Tianxing ZHANG Zhenchao;LIU Miao;SUN Jian;WEI Tianxing

作者机构：Synthesis Research Centre of Chinese Ecosystem Research NetworkKey Laboratory of Ecosystem Network Observation and ModellingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess PlateauInstitute of Soil and Water ConservationNorthwest A&F UniversityYangling 712100China Arid Land Research CenterTottori UniversityTottori 6800001Japan School of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2020年第12卷第5期

页      面：806-818页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：the State Key Research Development Program of China(2016YFC0501803,2016YFC0501802) the China Postdoctoral Science Foundation(2017M620889) the Second Tibetan Plateau Scientific Expedition and Research(2019QZKK0405) 

主　　题：belowground biomass soil properties plant community structure degradation alpine meadow Tibetan Plateau 

摘      要：Understanding the effects of degradation on belowground biomass(BGB)is essential for assessment of carbon budget of the alpine meadow ecosystem on the Tibetan Plateau,*** ecosystem has been undergoing serious degradation owing to climate change and anthropogenic *** study examined the response of the vertical distribution of plant BGB to degradation and explored the underlying mechanisms in an alpine meadow on the Tibetan Plateau.A field survey was conducted in an alpine meadow with seven sequential degrees of degradation in the Zoige Plateau on the Tibetan Plateau during the peak growing season of *** measured aboveground biomass(AGB),BGB,soil water content(SWC),soil bulk density(SBD),soil compaction(SCOM),soil organic carbon(SOC),soil total nitrogen(STN),soil total phosphorus(STP),soil available nitrogen(SAN),and soil available phosphorus(STP)in the 0-30 cm soil *** results show that degradation dramatically decreased the BGB in the 0-10 cm soil layer(BGB0-10)but slightly increased the subsoil *** main reason may be that the physical-chemical properties of surface soil were more sensitive to degradation than those of subsoil,as indicated by the remarked positive associations of the trade-off value of BGB0-10 with SWC,SCOM,SOC,STN,SAN,and STP,as well as the negative correlation between the trade-off value of BGB0-10 and SBD in the soil layer of 0-10 *** addition,an increase in the proportion of forbs with increasing degradation degree directly affected the BGB vertical *** findings suggest that the decrease in the trade-off value of BGB0-10 in response to degradation might be an adaptive strategy for the degradation-induced drought and infertile soil *** study can provide theoretical support for assessing the effects of degradation on the carbon budget and sustainable development in the alpine meadow ecosystem on the Tibetan Plateau as well as other similar ecosystems in the world.