Karst regions of Southwest China become a hotspot for global greening through large-scale vegetation restoration in recent two decades.However,the unique,fragile geological setting of carbonate rocks affects the susta...Karst regions of Southwest China become a hotspot for global greening through large-scale vegetation restoration in recent two decades.However,the unique,fragile geological setting of carbonate rocks affects the sustainability of vegetation greening.Here,we summarize and evaluate the impacts of the rock and soil compositions of karst landscapes on the types and quality of vegetation restoration.We introduce the concept of“soil mass”and establish its relationship with aboveground vegetation biomass across varying degrees of rocky desertification.The mineral nutrients and soil mass constrain the potential of vegetation carbon sequestration in karst regions.To enhance the sustainability of vegetation restoration and carbon sequestration under karst geological constraints,we suggest to push ecological intensification of tree plantations and optimize the zoning and classification of rocky desertification treatment,and these restoration initiatives will foster vegetation restoration to serve as a pivotal pathway towards carbon neutrality.展开更多
As a debris flow starts in the upper reaches of a gully or a ravine, its scale and destructive power are not very large. It rapidly strengthens in its flow process by eroding and carrying loose solid material along it...As a debris flow starts in the upper reaches of a gully or a ravine, its scale and destructive power are not very large. It rapidly strengthens in its flow process by eroding and carrying loose solid material along its running route, and at last, it accumulates great destructive power. If the initiation conditions may be regulated and controlled to prevent debris flows, practical benefits will be obtained. To study the conditions and展开更多
A man-made tracer for soil erosion exists in the world-wide fallout of <sup>137</sup>Cs from nuclear test. Most of the fallout occurred from 1956 through 1965 with maximum deposition rates in 1963—1964. R...A man-made tracer for soil erosion exists in the world-wide fallout of <sup>137</sup>Cs from nuclear test. Most of the fallout occurred from 1956 through 1965 with maximum deposition rates in 1963—1964. Reiatively little <sup>137</sup>Cs has been deposited since 1970. Cesium-137 is strongly adsorbed within the upper horizons of soil and resists leaching through soil. Since <sup>137</sup>Cs has a half-life of 30 a, it is a good tracer for long-term soil particle movement.展开更多
Hyperconcentrated viscous debris flows can move rapidly on low-gradient ravine under shear, because they have highly excessive pore pressure. The relationship between excessive pore-pressure (P e ) and volume concentr...Hyperconcentrated viscous debris flows can move rapidly on low-gradient ravine under shear, because they have highly excessive pore pressure. The relationship between excessive pore-pressure (P e ) and volume concentration (C vt ) in viscous debris flows, i. e.P e =2 494. 76C vt 0.94, is quantitatively shown; the correlation coefficienty=0.967 1, 95% confidence interval is 0.905 3<ρ<0.993 7. About 92.29% of all grains (by weight) is supported by excessive pore pressure.展开更多
基金funded by the National Key Research and Development Program of China(No.2022YFF1300700)the National Natural Science Foundation of China(Nos.41930652,U20A2048)+1 种基金the International Partnership Program of Chinese Academy of Sciences(No.092GJHZ2022029GC)the Double Thousand Talent Program of Jiangxi Province(No.jsxq2023102152).
文摘Karst regions of Southwest China become a hotspot for global greening through large-scale vegetation restoration in recent two decades.However,the unique,fragile geological setting of carbonate rocks affects the sustainability of vegetation greening.Here,we summarize and evaluate the impacts of the rock and soil compositions of karst landscapes on the types and quality of vegetation restoration.We introduce the concept of“soil mass”and establish its relationship with aboveground vegetation biomass across varying degrees of rocky desertification.The mineral nutrients and soil mass constrain the potential of vegetation carbon sequestration in karst regions.To enhance the sustainability of vegetation restoration and carbon sequestration under karst geological constraints,we suggest to push ecological intensification of tree plantations and optimize the zoning and classification of rocky desertification treatment,and these restoration initiatives will foster vegetation restoration to serve as a pivotal pathway towards carbon neutrality.
文摘As a debris flow starts in the upper reaches of a gully or a ravine, its scale and destructive power are not very large. It rapidly strengthens in its flow process by eroding and carrying loose solid material along its running route, and at last, it accumulates great destructive power. If the initiation conditions may be regulated and controlled to prevent debris flows, practical benefits will be obtained. To study the conditions and
基金Project supported by the National Natural Science Foundation of China and Xi'an Laboratory Foundation.
文摘A man-made tracer for soil erosion exists in the world-wide fallout of <sup>137</sup>Cs from nuclear test. Most of the fallout occurred from 1956 through 1965 with maximum deposition rates in 1963—1964. Reiatively little <sup>137</sup>Cs has been deposited since 1970. Cesium-137 is strongly adsorbed within the upper horizons of soil and resists leaching through soil. Since <sup>137</sup>Cs has a half-life of 30 a, it is a good tracer for long-term soil particle movement.
基金Project supported by the National Natural Science Foundation of China (Grant No. 49671008).
文摘Hyperconcentrated viscous debris flows can move rapidly on low-gradient ravine under shear, because they have highly excessive pore pressure. The relationship between excessive pore-pressure (P e ) and volume concentration (C vt ) in viscous debris flows, i. e.P e =2 494. 76C vt 0.94, is quantitatively shown; the correlation coefficienty=0.967 1, 95% confidence interval is 0.905 3<ρ<0.993 7. About 92.29% of all grains (by weight) is supported by excessive pore pressure.
