草业学报2024，Vol.33Issue(11)：30-45,16.DOI:10.11686/cyxb2023484
短期增温对修复过程中藏北高寒退化草地生产力的初期影响
Initial effects of short-term warming on the productivity of alpine degraded grassland in northern Tibet during the restoration process
摘要
Abstract
Climate warming is expected to affect the productivity of alpine grassland in northern Tibet,and this may affect the grassland restoration process.The aim of this study,therefore,was to determine the effects of a short-term temperature increase on the productivity of alpine grassland during restoration.Natural restored grassland(NR),no-tillage replanted grassland(S),and tilled replanted grassland(TS),with native heavily degraded grassland as the control(CK),were subjected to a warming treatment using the open top chamber method.The changes in the plant community,biomass,and species diversity in response to this short-term temperature increase were determined.The results showed that:1)Warming increased the surface soil temperature by an average of 1.34℃and decreased the soil moisture content by an average of 4.18%.2)After short-term warming,the plant community cover increased significantly(P<0.05)and the height of plant community decreased significantly(P<0.05);the biomass of vegetation in CK transferred to the underground plant parts,the biomass of vegetation in NR,S,and TS shifted to the aboveground plant parts;and the aboveground biomass decreased significantly in TS(P<0.05).3)Short-term warming decreased the aboveground biomass and importance value of grasses(P<0.05)but increased the aboveground biomass and importance value of forbs(P<0.05).4)In CK,warming significantly increased the species richness index,Shannon-Wiener index,and Simpson index by 17.65%,18.54%,and 11.52%,respectively(P<0.05).In S,the warming treatment resulted in a significant decrease in the Pielou index(P<0.05).5)After short-term warming,the above-ground biomass showed a highly significant negative correlation with the species diversity index(P<0.01);however,the below-ground biomass showed no significant correlation with the species diversity index or community characteristics.In conclusion,short-term warming had a certain positive effect on the recovery of the species diversity in native heavily degraded grassland in northern Tibet.Short-term warming restored the productivity of naturally restored grassland and no-tillage replanted grassland,but suppressed the growth and reduced the productivity of tilled replanted grassland.关键词
模拟增温/高寒草地/生产力/生物量/物种多样性Key words
simulated warming/alpine grassland/productivity/biomass/species diversity引用本文复制引用
石昊,冉林灵,严双,姜晓敏,杨彩红,夏菲,王军强,魏巍,王敬龙,薛云尹,郑晒坤,吴皓阳..短期增温对修复过程中藏北高寒退化草地生产力的初期影响[J].草业学报,2024,33(11):30-45,16.基金项目
甘肃农业大学青年导师基金项目(GAU-QDFC-2021-12)和西藏自治区重点研发与转化项目(XZ202201ZY0005N)资助. （GAU-QDFC-2021-12）
