The Tibetan Plateau is characterized by extreme weather,harsh environment,and high sensitivity to climate warming and human activities[1].Once degraded,it is difficult to rehabilitate the ecosystems in this region bec...The Tibetan Plateau is characterized by extreme weather,harsh environment,and high sensitivity to climate warming and human activities[1].Once degraded,it is difficult to rehabilitate the ecosystems in this region because of the unique environment.Consequently,alpine grassland ecosystems of the Tibetan Plateau play important roles in regional ecological security and economic development.Nevertheless,alpine grasslands have been experiencing serious degradation owing to the escalating impact of overgrazing and climate change in recent years[2].展开更多
Soil remediation is an important part of the restoration process of degraded terrestrial ecosystems.Due to its unique properties,biochar is being used widely as an effective soil modifier in agricultural systems,but r...Soil remediation is an important part of the restoration process of degraded terrestrial ecosystems.Due to its unique properties,biochar is being used widely as an effective soil modifier in agricultural systems,but research is still rare on biochar application in grassland ecosystems,especially in degraded alpine grasslands.In this study,we conducted a plot experiment to investigate the effect of biochar application on soil physicochemical properties and microorganisms at the 0–20 cm soil depth of a degraded alpine grassland in Qinghai-Tibet Plateau,China.The experiment consisted of four corn straw biochar application levels(0%,0.5%,1%and 2%,with the percentage representing the ratio of biochar weight to the dry weight of soil in the surface 20 cm soil layer).When the biochar addition increased from 0%to 2%,total nitrogen,total organic carbon and available phosphorus in the 0–10 cm soil layer increased by 41%,55%and 45%,respectively,in the second year after biochar addition.Meanwhile,soil electrical conductivity decreased,and soil water content increased.Total microbial,fungal and bacterial biomasses in the 0–10 cm soil layer increased from 9.15 to 12.68,0.91 to 1.34,and 3.85 to 4.55μg g^(-1),respectively.The relative biomasses of saprophytic fungi and methanotrophic bacteria decreased,while the relative biomasses of ectomycorrhizal fungi and arbuscular mycorrhizal fungi increased.These results indicate that biochar has a great potential in improving microbial activity and soil fertility in soil remediation of the degraded alpine grassland.展开更多
基金the Second Tibetan Plateau Scientific Expedition and Research(2019QZKK0405)the National Natural Science Foundation of China(31901198)+1 种基金the Joint Research Project of Three-River-Resource National Park Funded by Chinese Academy of Sciences and Qinghai Provincial People’s Government(LHZX-2020-08)Qinghai Innovation Platform Construction Project(2021-ZJ-Y01)。
文摘The Tibetan Plateau is characterized by extreme weather,harsh environment,and high sensitivity to climate warming and human activities[1].Once degraded,it is difficult to rehabilitate the ecosystems in this region because of the unique environment.Consequently,alpine grassland ecosystems of the Tibetan Plateau play important roles in regional ecological security and economic development.Nevertheless,alpine grasslands have been experiencing serious degradation owing to the escalating impact of overgrazing and climate change in recent years[2].
基金supported by Beijing Science and Technology Plan,China(No.Z181100009618031)the National Natural Science Foundation of China(No.41771255)+1 种基金the National Key Research and Development Program of China(Nos.2016YFC0501902 and 2018YFF0213405)the Key Science and Technology Project of Qinghai Province,China(No.2018-NK-A2)。
文摘Soil remediation is an important part of the restoration process of degraded terrestrial ecosystems.Due to its unique properties,biochar is being used widely as an effective soil modifier in agricultural systems,but research is still rare on biochar application in grassland ecosystems,especially in degraded alpine grasslands.In this study,we conducted a plot experiment to investigate the effect of biochar application on soil physicochemical properties and microorganisms at the 0–20 cm soil depth of a degraded alpine grassland in Qinghai-Tibet Plateau,China.The experiment consisted of four corn straw biochar application levels(0%,0.5%,1%and 2%,with the percentage representing the ratio of biochar weight to the dry weight of soil in the surface 20 cm soil layer).When the biochar addition increased from 0%to 2%,total nitrogen,total organic carbon and available phosphorus in the 0–10 cm soil layer increased by 41%,55%and 45%,respectively,in the second year after biochar addition.Meanwhile,soil electrical conductivity decreased,and soil water content increased.Total microbial,fungal and bacterial biomasses in the 0–10 cm soil layer increased from 9.15 to 12.68,0.91 to 1.34,and 3.85 to 4.55μg g^(-1),respectively.The relative biomasses of saprophytic fungi and methanotrophic bacteria decreased,while the relative biomasses of ectomycorrhizal fungi and arbuscular mycorrhizal fungi increased.These results indicate that biochar has a great potential in improving microbial activity and soil fertility in soil remediation of the degraded alpine grassland.
