The study of the parameters influencing the absorption of atmospheric humidity not condensed by plants with aerial roots is a challenge in the current context of climatic disturbance where methods of adapting plants t...The study of the parameters influencing the absorption of atmospheric humidity not condensed by plants with aerial roots is a challenge in the current context of climatic disturbance where methods of adapting plants to water stress have become the concern of many scientific researchers. Based on Poiseuille and Fick laws, leaf water potential depending on solar radiation and atmospheric water potential around aerial roots;the influence of temperature, relative humidity, inclination angle of roots and solar radiation wavelength on the radial and axial water flow through a root segment is simulated. The various simulations show that a low temperature of the air surrounding the root favors a significant entry of water into the root as well as a relative humidity of the high air approaching 100%. The angle of inclination has an influence on the quantity of water entering the root and that rising in the xylem. These different streams of water are optimized for root tilting of 60°. The wavelength of the red radiation received by the leaves favors more entry and rise of water in the root. Future studies for transgenes should be taken into account the influence of all these parameters.展开更多
Background: Air temperature affects absorptive root traits, which are closely related to species distribution.However, it is still unclear how air temperature regulates species distribution through changes in absorpti...Background: Air temperature affects absorptive root traits, which are closely related to species distribution.However, it is still unclear how air temperature regulates species distribution through changes in absorptive root traits. Seven functional traits of the absorptive roots of 240 individuals of 52 species, soil properties and air temperature were measured along an elevational gradient on Mt. Fanjingshan, Tongren City, Guizhou, and then the direct and indirect effects of these controls on species distribution were detected.Results: Absorptive roots adapted to air temperature with two strategies. The first strategy was positively associated with the specific root area(SRA) and specific root length(SRL) and was negatively associated with the root tissue density(RTD), representing the classic root economics spectrum(RES). The second strategy was represented by the trade-off between root diameter, mycorrhizal fungi colonization(MF) and SRL, representing the collaboration gradient with “do it yourself” resource uptake ranging from “outsourcing” to mycorrhizal resource uptake. Air temperature regulated species distribution in six ways: directly reducing species importance value;indirectly increasing the species importance value by reducing soil nitrogen content or increasing soil pH by reducing soil moisture inducing absorptive roots to change from “do it yourself” resource absorption to “outsourcing” resource absorption;indirectly decreasing the species importance value by decreasing soil moisture to change from“outsourcing”resource absorption to “do it yourself” resource absorption;indirectly increasing the species importance value with increasing soil pH by reducing soil moisture resulting in absorptive root traits turning into nutrient foraging traits;and indirectly decreasing the species importance value by promoting absorptive root traits to nutrient conservation traits.Conclusions: Absorptive root traits play a crucial role in the regulation of species distribution through multiapproaches of air temperature.展开更多
Objective To summarize the anesthesia techniques performed in the selective posterior rhizotomy(SPR) at lumbar and sacral regions(L&R)on juvenile cerebral palsy(CP) patients. Method 144 CP patients below 10 years ...Objective To summarize the anesthesia techniques performed in the selective posterior rhizotomy(SPR) at lumbar and sacral regions(L&R)on juvenile cerebral palsy(CP) patients. Method 144 CP patients below 10 years were successfully performed SPR at L&R under combined intravenous and inhalation anesthesia (CIIA) in prone position with threshold values of each nerve root being measured by means of nerve root electric stimulus (NRES). Result All patients were performed SPR and NRES successfully although blood pressure and heart rate increased significantly while NRES. Conclusion CIIA is safe and effective for juvenile CP patients to be performed SPR at L&R.展开更多
为探究森林生态系统在环境变化中的生存策略,预测植物根系在长期氮沉降背景下的响应模式,在亚热带天然常绿阔叶林中设置对照和施氮[80 kg N/(hm2·a)]2个处理,研究长期氮添加对根系生物量、比根长、比表面积和组织密度等的影响。结...为探究森林生态系统在环境变化中的生存策略,预测植物根系在长期氮沉降背景下的响应模式,在亚热带天然常绿阔叶林中设置对照和施氮[80 kg N/(hm2·a)]2个处理,研究长期氮添加对根系生物量、比根长、比表面积和组织密度等的影响。结果表明,长期的氮添加没有对根系生物量及其根系生物量消减系数β产生显著影响(P>0.05),即根系生物量的垂直分布特征并没有发生显著变化(即在不同土层积累的生物量之间没有明显差异),对照和氮处理下的不同径级的根系生物量密度随土层变化的趋势相同,但是土层和径级的交互作用会对根系生物量产生显著影响;长期氮添加显著增加0~1 mm的细根比根长;但是长期的氮添加显著降低了组织密度且不受径级的影响;而氮添加对根系比表面积无显著影响,这种变化是在群落水平上的一种整体的变化趋势。在群落水平上,长期的氮添加对亚热带常绿阔叶林根系生物量及垂直分布无显著影响,这正与土壤总碳氮磷的含量随土层变化一致。但11a的氮添加会增加比根长而降低组织密度,一些物种的根系资源获取策略会变为快速获取型策略。因此,长期的氮沉降背景下根系会通过增加比根长,降低组织密度来响应养分变化。展开更多
文摘The study of the parameters influencing the absorption of atmospheric humidity not condensed by plants with aerial roots is a challenge in the current context of climatic disturbance where methods of adapting plants to water stress have become the concern of many scientific researchers. Based on Poiseuille and Fick laws, leaf water potential depending on solar radiation and atmospheric water potential around aerial roots;the influence of temperature, relative humidity, inclination angle of roots and solar radiation wavelength on the radial and axial water flow through a root segment is simulated. The various simulations show that a low temperature of the air surrounding the root favors a significant entry of water into the root as well as a relative humidity of the high air approaching 100%. The angle of inclination has an influence on the quantity of water entering the root and that rising in the xylem. These different streams of water are optimized for root tilting of 60°. The wavelength of the red radiation received by the leaves favors more entry and rise of water in the root. Future studies for transgenes should be taken into account the influence of all these parameters.
基金financially supported by the National Nature Science Foundation of China (No.32001248)the Characteristic Field Project of Department of Education of Guizhou Province (NO.[2019]075)+3 种基金PhD Research Start-up Foundation of Tongren University (No.trxyDH1807)Guizhou Forestry Research Project (No.[2019]014)the Science and Technology Plan Project of Guizhou Province (NO.[2019]1312,NO.[2022]general-556)the Key Laboratory Project of Guizhou Province (No.[2020]2003)
文摘Background: Air temperature affects absorptive root traits, which are closely related to species distribution.However, it is still unclear how air temperature regulates species distribution through changes in absorptive root traits. Seven functional traits of the absorptive roots of 240 individuals of 52 species, soil properties and air temperature were measured along an elevational gradient on Mt. Fanjingshan, Tongren City, Guizhou, and then the direct and indirect effects of these controls on species distribution were detected.Results: Absorptive roots adapted to air temperature with two strategies. The first strategy was positively associated with the specific root area(SRA) and specific root length(SRL) and was negatively associated with the root tissue density(RTD), representing the classic root economics spectrum(RES). The second strategy was represented by the trade-off between root diameter, mycorrhizal fungi colonization(MF) and SRL, representing the collaboration gradient with “do it yourself” resource uptake ranging from “outsourcing” to mycorrhizal resource uptake. Air temperature regulated species distribution in six ways: directly reducing species importance value;indirectly increasing the species importance value by reducing soil nitrogen content or increasing soil pH by reducing soil moisture inducing absorptive roots to change from “do it yourself” resource absorption to “outsourcing” resource absorption;indirectly decreasing the species importance value by decreasing soil moisture to change from“outsourcing”resource absorption to “do it yourself” resource absorption;indirectly increasing the species importance value with increasing soil pH by reducing soil moisture resulting in absorptive root traits turning into nutrient foraging traits;and indirectly decreasing the species importance value by promoting absorptive root traits to nutrient conservation traits.Conclusions: Absorptive root traits play a crucial role in the regulation of species distribution through multiapproaches of air temperature.
文摘Objective To summarize the anesthesia techniques performed in the selective posterior rhizotomy(SPR) at lumbar and sacral regions(L&R)on juvenile cerebral palsy(CP) patients. Method 144 CP patients below 10 years were successfully performed SPR at L&R under combined intravenous and inhalation anesthesia (CIIA) in prone position with threshold values of each nerve root being measured by means of nerve root electric stimulus (NRES). Result All patients were performed SPR and NRES successfully although blood pressure and heart rate increased significantly while NRES. Conclusion CIIA is safe and effective for juvenile CP patients to be performed SPR at L&R.
文摘为探究森林生态系统在环境变化中的生存策略,预测植物根系在长期氮沉降背景下的响应模式,在亚热带天然常绿阔叶林中设置对照和施氮[80 kg N/(hm2·a)]2个处理,研究长期氮添加对根系生物量、比根长、比表面积和组织密度等的影响。结果表明,长期的氮添加没有对根系生物量及其根系生物量消减系数β产生显著影响(P>0.05),即根系生物量的垂直分布特征并没有发生显著变化(即在不同土层积累的生物量之间没有明显差异),对照和氮处理下的不同径级的根系生物量密度随土层变化的趋势相同,但是土层和径级的交互作用会对根系生物量产生显著影响;长期氮添加显著增加0~1 mm的细根比根长;但是长期的氮添加显著降低了组织密度且不受径级的影响;而氮添加对根系比表面积无显著影响,这种变化是在群落水平上的一种整体的变化趋势。在群落水平上,长期的氮添加对亚热带常绿阔叶林根系生物量及垂直分布无显著影响,这正与土壤总碳氮磷的含量随土层变化一致。但11a的氮添加会增加比根长而降低组织密度,一些物种的根系资源获取策略会变为快速获取型策略。因此,长期的氮沉降背景下根系会通过增加比根长,降低组织密度来响应养分变化。
