Climate warming profoundly affects plant biodiversity, community productivity, and soil properties in alpine and subalpine grassland ecosystems. However, these effects are poorly understood across elevational gradient...Climate warming profoundly affects plant biodiversity, community productivity, and soil properties in alpine and subalpine grassland ecosystems. However, these effects are poorly understood across elevational gradients in subalpine meadow ecosystems. To reveal the elevational patterns of warming effects on plant biodiversity, community structure, productivity, and soil properties, we conducted a warming experiment using open-top chambers from August 2019 to August 2022 at high(2764 m a. s. l.), medium(2631 m a. s. l.), and low(2544 m a. s. l.) elevational gradients on a subalpine meadow slope of Mount Wutai, Northern China. Our results showed that three years of warming significantly increased topsoil temperature but significantly decreased topsoil moisture at all elevations(P<0.05), and the percentage of increasing temperature and decreasing moisture both gradually raised with elevation lifting. Warming-induced decreasing proportions of soil organic carbon(SOC, by 19.24%), and total nitrogen(TN, by 24.56%) were the greatest at high elevational gradients. Experimental warming did not affect topsoil C: N, p H, NO_(3)^(-)-N, or NH_(4)^(+)-N at the three elevational gradients. Warming significantly increased species richness(P<0.01) and Shannon-Weiner index(P<0.05) at low elevational gradients but significantly decreased belowground biomass(P<0.05) at a depth of 0–10 cm at three elevational gradients. Warming caused significant increases in the aboveground biomass in the three elevational plots. Warming significantly increased the aboveground biomass of graminoids in medium(by 92.47%) and low(by 98.25%) elevational gradients, that of sedges in high(by 72.44%) and medium(by 57.16%) elevational plots, and that of forbs in high(by 75.88%), medium(by 34.38%), and low(by 74.95%) elevational plots. Species richness had significant linear correlations with SOC, TN, and C: N(P<0.05), but significant nonlinear responses to soil temperature and soil moisture in the warmed treatment(P<0.05). The warmed aboveground biomass had a significant nonlinear response to soil temperature and significant linear responses to soil moisture(P<0.05). This study provided evidence that altitude is a factor in sensitivity to climate warming, and these different parameters(e.g., plant species richness, Shannon-Weiner index, soil temperature, soil moisture, SOC, and TN) can be used to measure this sensitivity.展开更多
This paper provides a positive view of the desert, in terms of the warming effect of deserts on oases and the impact of heat re- sources and agricultural production. We use data from experimental sites in the Manas Ri...This paper provides a positive view of the desert, in terms of the warming effect of deserts on oases and the impact of heat re- sources and agricultural production. We use data from experimental sites in the Manas River Basin in China to characterize these relationships. We note that the warming effect of the desert was found to be significant but gradually reduced with in- creased distance of the oasis from the desert. The range of wanning effect is about 100 km, and the improvement in tempera- ture is about 1.8 ℃. Due to this warming effect, the desert serves as the second heat source for the oasis, which represents one important aspect of the ecologic value of the desert. Our results also show the warming effect has a strong spatial impact on agricultural productivity. Crop productivity fell by about 49 kg/ha with every 10 km increase in distance away from the desert. Our results imply that crop suitability must correspond to the warming effect of the desert. More efficient use of heat resources can contribute towards achieving potential productivity.展开更多
A global mean ocean model including atmospheric heating, heat capacity of the mixed layer ocean, and vertical thermal diffusivity in the lower ocean, proposed by Cess and Goldenberg (1981), is used in this paper to st...A global mean ocean model including atmospheric heating, heat capacity of the mixed layer ocean, and vertical thermal diffusivity in the lower ocean, proposed by Cess and Goldenberg (1981), is used in this paper to study the sensitivity of global warming to the vertical diffusivity. The results suggest that the behaviour of upper ocean temperature is mainly determined by the magnitude of upper layer diffusivity and an ocean with a larger diffusivity leads to a less increase of sea surface temperature and a longer time delay for the global warming induced by increasing CO2 than that with smaller one. The global warming relative to four scenarios of CO2 emission assumed by Intergovernmental Panel of Climate Change (IPCC) is also estimated by using the model with two kinds of thermal diffusivities. The result shows that for various combinations of the CO2 emission scenarios and the diffusivities, the oceanic time delay to the global warming varies from 15 years to 70 years.展开更多
An ultrafine-grained(UFG) low-carbon medium-manganese steel was fabricated by the heavily warm rolling(HWR) and subsequent quenching, and the effects of annealing temperatures on microstructure and mechanical properti...An ultrafine-grained(UFG) low-carbon medium-manganese steel was fabricated by the heavily warm rolling(HWR) and subsequent quenching, and the effects of annealing temperatures on microstructure and mechanical properties of the UFG HWRed steel were investigated. The results show that the HWRed steel exhibits simultaneous improvements in strength,uniform elongation and work hardening, which is mainly attributed to the refinement of martensitic microstructures. The HWRed steels comprise only a-phase when annealing at lower temperatures below to 550 °C and at higher temperatures above to 700 °C. Whereas, UFG c-austenite is formed by reverse transformation when the HWRed steel was annealed at intermediate temperatures from 550 to 700 °C and the volume fraction increases with increasing annealing temperatures,consequently resulting in a dramatic increase in ductility of the annealed HWRed steels. It was found that the transformed UFG austenite and ferrite remained ～500 nm and ～800 nm in size when the HWRed steel was annealed at 650 and700 °C for 1 h, respectively, showing an excellent thermal stability. Moreover, the HWRed steel annealed at 650 °C exhibits high strength-ductility combinations with a yield strength of 906 MPa, ultimate tensile strength(UTS) of1011 MPa, total elongation(TEL) of 51% and product of strength and elongation(PSE: UTS 9 TEL) of 52 GPa%. It is believed that these excellent comprehensive mechanical properties are closely associated with the UFG austenite formation by reverse transformation and principally attributed to the transformation-induced plasticity(TRIP) effect.展开更多
Warm deformation tests were performed using a kind of tubby heater. The microstructures and mechanical properties of an Fe-C-Mn-Si multiphase steel resulting from different warm deformation temperatures were investiga...Warm deformation tests were performed using a kind of tubby heater. The microstructures and mechanical properties of an Fe-C-Mn-Si multiphase steel resulting from different warm deformation temperatures were investiga- ted by using LOM （light optical microscopy）, SEM and XRD. The results indicated that the microstructure contai- ning polygonal ferrite, granular bainite and a significant amount of the stable retained austenite can be obtained through hot deformation and subsequent austempering. Warm deformation temperature affects the mechanical prop- erties of the hot rolled TRIP steels. Ultimate tensile strength balance reached maximum （881 MPa） when the speci- men was deformed at 250 ~C, and the total elongation and strength-ductility reached maximum （38% and 28 614 MPa ~ ~, respectively） at deforming temperature of 100 ~C. Martensite could nucleate when austenite was deformed above M~, because mechanical driving force compensates the decrease of chemical driving force. The TRIP effect occurs in the Fe-C-Mn-Si multiphase steel at deforming temperature ranging from 15 to 350 ~C. The results of the effects of warm deformation on the mechanical properties of the Fe-C-Mn-Si multiphase steel can provide theoretical basis for the ap- plications and the warm working of the hot rolled TRIP sheet steels in industrial manufacturing.展开更多
目的观察培元养心法(背俞穴温针灸)治疗肾阳不足型膝关节退行性病变疗效。方法纳入肾阳不足型膝关节退行性病变患者80例,采取随机数字表法分为对照组40例与观察组40例,对照组接受膝关节置换术治疗,观察组在对照组治疗基础上结合培元养心...目的观察培元养心法(背俞穴温针灸)治疗肾阳不足型膝关节退行性病变疗效。方法纳入肾阳不足型膝关节退行性病变患者80例,采取随机数字表法分为对照组40例与观察组40例,对照组接受膝关节置换术治疗,观察组在对照组治疗基础上结合培元养心法(背俞穴温针灸)治疗,观察各组数据情况:疗效优良率、治疗前后中医证候积分变化、术后3 d及术后6 d、术后9 d患者的疼痛评分[视觉模拟疼痛评分法(Visual analogue scale,VAS)],治疗前后患者C反应蛋白(C-reactive protein,CRP)及肿瘤坏死因子α(Tumor necrosis factor-α,TNF-α)和白介素-6(Interleukin-6,IL-6)指标变化、治疗前后患者Lysholm膝关节量表评分变化、并发症发生率、治疗前、治疗2周及治疗4周身体健康评分(the MOS item short from health survey,SF-36)。结果观察组患者治疗效果优良率(95.00%,38/40)高于对照组(80.00%,32/40),差异有统计学意义(P<0.05);各组患者治疗后中医证候积分下降,炎症因子(CRP、TNF-α、IL-6)均显著下降,Lysholm膝关节量表总评分显著上升,观察组治疗后中医证候积分及炎症因子(CRP、TNF-α、IL-6)均低于对照组,Lysholm膝关节量表总评分高于对照组,差异有统计学意义(P<0.05);观察组患者术后3、6、9 d的VAS评分均比对照组更低,差异有统计学意义(P<0.05);对照组并发症率为20.00%(8/40),比观察组的5.00%(2/40)更低,差异有统计学意义(P<0.05);治疗2周及治疗4周后观察组患者的SF-36评分均高于对照组患者,差异有统计学意义(P<0.05)。结论培元养心法(背俞穴温针灸)治疗肾阳不足型膝关节退行性病变疗效良好,患者症状改善,膝关节功能改善,并发症少,治疗安全可靠,且患者治疗后身体健康好转,值得应用。展开更多
Background:There is a gap in understanding the effects of different acupoints and treatment methods(acupuncture and moxibustion)on microcirculatory changes in the lumbar region.Objective:This study aimed to assess the...Background:There is a gap in understanding the effects of different acupoints and treatment methods(acupuncture and moxibustion)on microcirculatory changes in the lumbar region.Objective:This study aimed to assess the thermal effects of acupuncture at Weizhong(BL40),with acupuncture at Chize(LU5)and moxibustion at both acupoints as control interventions.Design,setting,participants and interventions:In this randomized controlled trial,140 healthy participants were equally divided into four groups:acupuncture at BL40(Acu-BL40),acupuncture at LU5(Acu-LU5),moxibustion at BL40(Mox-BL40)and moxibustion at LU5(Mox-LU5).Participants underwent a 30-minute session of their assigned treatment.Infrared thermal imaging was used to collect temperature data on the areas of interest for analysis.Main outcome measures:The primary measure was the change in average temperature of the observed area after the intervention.The secondary measures included periodic temperature changes every5 min and the temperature changes of the Governor Vessel and Bladder Meridian in the observed area after the intervention.Results:Significant interactions were observed between treatments and acupoints affecting temperature(P<0.001).The Acu-BL40 group showed a notably higher increase in mean temperature after 30 min compared to the Acu-LU5 and Mox-BL40 groups,with increases of 0.29(95%confidence interval[CI]=0.17 to 0.41)and 0.24(95%CI=0.08 to 0.41)℃,respectively.Conclusion:Acupuncture at BL40 acupoint can significantly increase the mean temperature in the observed area,highlighting the specific thermal effect of acupuncture compared to moxibustion in the lumbar area.This suggests a potential therapeutic benefit of acupuncture at BL40 for managing lumbar conditions.展开更多
基金carried out in the framework of the 1331 Project of Cultural Ecology Collaborative Innovation Center in Wutai Mountain (00000342)co-financed by Program for the Philosophy and Social Sciences Research of Higher Learning Institutions of Shanxi (2022J027)+1 种基金Applied Basic Research Project of Shanxi Province (202203021221225)Basic Research Project of Xinzhou Science and Technology Bureau (20230501)。
文摘Climate warming profoundly affects plant biodiversity, community productivity, and soil properties in alpine and subalpine grassland ecosystems. However, these effects are poorly understood across elevational gradients in subalpine meadow ecosystems. To reveal the elevational patterns of warming effects on plant biodiversity, community structure, productivity, and soil properties, we conducted a warming experiment using open-top chambers from August 2019 to August 2022 at high(2764 m a. s. l.), medium(2631 m a. s. l.), and low(2544 m a. s. l.) elevational gradients on a subalpine meadow slope of Mount Wutai, Northern China. Our results showed that three years of warming significantly increased topsoil temperature but significantly decreased topsoil moisture at all elevations(P<0.05), and the percentage of increasing temperature and decreasing moisture both gradually raised with elevation lifting. Warming-induced decreasing proportions of soil organic carbon(SOC, by 19.24%), and total nitrogen(TN, by 24.56%) were the greatest at high elevational gradients. Experimental warming did not affect topsoil C: N, p H, NO_(3)^(-)-N, or NH_(4)^(+)-N at the three elevational gradients. Warming significantly increased species richness(P<0.01) and Shannon-Weiner index(P<0.05) at low elevational gradients but significantly decreased belowground biomass(P<0.05) at a depth of 0–10 cm at three elevational gradients. Warming caused significant increases in the aboveground biomass in the three elevational plots. Warming significantly increased the aboveground biomass of graminoids in medium(by 92.47%) and low(by 98.25%) elevational gradients, that of sedges in high(by 72.44%) and medium(by 57.16%) elevational plots, and that of forbs in high(by 75.88%), medium(by 34.38%), and low(by 74.95%) elevational plots. Species richness had significant linear correlations with SOC, TN, and C: N(P<0.05), but significant nonlinear responses to soil temperature and soil moisture in the warmed treatment(P<0.05). The warmed aboveground biomass had a significant nonlinear response to soil temperature and significant linear responses to soil moisture(P<0.05). This study provided evidence that altitude is a factor in sensitivity to climate warming, and these different parameters(e.g., plant species richness, Shannon-Weiner index, soil temperature, soil moisture, SOC, and TN) can be used to measure this sensitivity.
基金supported by the National Key Research Council Project (Grant No. 30760105)Program for New Century Excellent Talents under the Ministry of Education(NCET-09-0903)
文摘This paper provides a positive view of the desert, in terms of the warming effect of deserts on oases and the impact of heat re- sources and agricultural production. We use data from experimental sites in the Manas River Basin in China to characterize these relationships. We note that the warming effect of the desert was found to be significant but gradually reduced with in- creased distance of the oasis from the desert. The range of wanning effect is about 100 km, and the improvement in tempera- ture is about 1.8 ℃. Due to this warming effect, the desert serves as the second heat source for the oasis, which represents one important aspect of the ecologic value of the desert. Our results also show the warming effect has a strong spatial impact on agricultural productivity. Crop productivity fell by about 49 kg/ha with every 10 km increase in distance away from the desert. Our results imply that crop suitability must correspond to the warming effect of the desert. More efficient use of heat resources can contribute towards achieving potential productivity.
文摘A global mean ocean model including atmospheric heating, heat capacity of the mixed layer ocean, and vertical thermal diffusivity in the lower ocean, proposed by Cess and Goldenberg (1981), is used in this paper to study the sensitivity of global warming to the vertical diffusivity. The results suggest that the behaviour of upper ocean temperature is mainly determined by the magnitude of upper layer diffusivity and an ocean with a larger diffusivity leads to a less increase of sea surface temperature and a longer time delay for the global warming induced by increasing CO2 than that with smaller one. The global warming relative to four scenarios of CO2 emission assumed by Intergovernmental Panel of Climate Change (IPCC) is also estimated by using the model with two kinds of thermal diffusivities. The result shows that for various combinations of the CO2 emission scenarios and the diffusivities, the oceanic time delay to the global warming varies from 15 years to 70 years.
基金financially supported by the National Major Science and Technology Project of China (No. 2014ZX07214-002)
文摘An ultrafine-grained(UFG) low-carbon medium-manganese steel was fabricated by the heavily warm rolling(HWR) and subsequent quenching, and the effects of annealing temperatures on microstructure and mechanical properties of the UFG HWRed steel were investigated. The results show that the HWRed steel exhibits simultaneous improvements in strength,uniform elongation and work hardening, which is mainly attributed to the refinement of martensitic microstructures. The HWRed steels comprise only a-phase when annealing at lower temperatures below to 550 °C and at higher temperatures above to 700 °C. Whereas, UFG c-austenite is formed by reverse transformation when the HWRed steel was annealed at intermediate temperatures from 550 to 700 °C and the volume fraction increases with increasing annealing temperatures,consequently resulting in a dramatic increase in ductility of the annealed HWRed steels. It was found that the transformed UFG austenite and ferrite remained ～500 nm and ～800 nm in size when the HWRed steel was annealed at 650 and700 °C for 1 h, respectively, showing an excellent thermal stability. Moreover, the HWRed steel annealed at 650 °C exhibits high strength-ductility combinations with a yield strength of 906 MPa, ultimate tensile strength(UTS) of1011 MPa, total elongation(TEL) of 51% and product of strength and elongation(PSE: UTS 9 TEL) of 52 GPa%. It is believed that these excellent comprehensive mechanical properties are closely associated with the UFG austenite formation by reverse transformation and principally attributed to the transformation-induced plasticity(TRIP) effect.
基金Sponsored by National Natural Science Foundation of China (50334010)
文摘Warm deformation tests were performed using a kind of tubby heater. The microstructures and mechanical properties of an Fe-C-Mn-Si multiphase steel resulting from different warm deformation temperatures were investiga- ted by using LOM （light optical microscopy）, SEM and XRD. The results indicated that the microstructure contai- ning polygonal ferrite, granular bainite and a significant amount of the stable retained austenite can be obtained through hot deformation and subsequent austempering. Warm deformation temperature affects the mechanical prop- erties of the hot rolled TRIP steels. Ultimate tensile strength balance reached maximum （881 MPa） when the speci- men was deformed at 250 ~C, and the total elongation and strength-ductility reached maximum （38% and 28 614 MPa ~ ~, respectively） at deforming temperature of 100 ~C. Martensite could nucleate when austenite was deformed above M~, because mechanical driving force compensates the decrease of chemical driving force. The TRIP effect occurs in the Fe-C-Mn-Si multiphase steel at deforming temperature ranging from 15 to 350 ~C. The results of the effects of warm deformation on the mechanical properties of the Fe-C-Mn-Si multiphase steel can provide theoretical basis for the ap- plications and the warm working of the hot rolled TRIP sheet steels in industrial manufacturing.
文摘目的观察培元养心法(背俞穴温针灸)治疗肾阳不足型膝关节退行性病变疗效。方法纳入肾阳不足型膝关节退行性病变患者80例,采取随机数字表法分为对照组40例与观察组40例,对照组接受膝关节置换术治疗,观察组在对照组治疗基础上结合培元养心法(背俞穴温针灸)治疗,观察各组数据情况:疗效优良率、治疗前后中医证候积分变化、术后3 d及术后6 d、术后9 d患者的疼痛评分[视觉模拟疼痛评分法(Visual analogue scale,VAS)],治疗前后患者C反应蛋白(C-reactive protein,CRP)及肿瘤坏死因子α(Tumor necrosis factor-α,TNF-α)和白介素-6(Interleukin-6,IL-6)指标变化、治疗前后患者Lysholm膝关节量表评分变化、并发症发生率、治疗前、治疗2周及治疗4周身体健康评分(the MOS item short from health survey,SF-36)。结果观察组患者治疗效果优良率(95.00%,38/40)高于对照组(80.00%,32/40),差异有统计学意义(P<0.05);各组患者治疗后中医证候积分下降,炎症因子(CRP、TNF-α、IL-6)均显著下降,Lysholm膝关节量表总评分显著上升,观察组治疗后中医证候积分及炎症因子(CRP、TNF-α、IL-6)均低于对照组,Lysholm膝关节量表总评分高于对照组,差异有统计学意义(P<0.05);观察组患者术后3、6、9 d的VAS评分均比对照组更低,差异有统计学意义(P<0.05);对照组并发症率为20.00%(8/40),比观察组的5.00%(2/40)更低,差异有统计学意义(P<0.05);治疗2周及治疗4周后观察组患者的SF-36评分均高于对照组患者,差异有统计学意义(P<0.05)。结论培元养心法(背俞穴温针灸)治疗肾阳不足型膝关节退行性病变疗效良好,患者症状改善,膝关节功能改善,并发症少,治疗安全可靠,且患者治疗后身体健康好转,值得应用。
基金funded by the National Key Research and Development Program of China(No.2018YFC1704600)Top-notch Innovative Talent Cultivation Program of Zhejiang Chinese Medicine University(No.741100G00726)。
文摘Background:There is a gap in understanding the effects of different acupoints and treatment methods(acupuncture and moxibustion)on microcirculatory changes in the lumbar region.Objective:This study aimed to assess the thermal effects of acupuncture at Weizhong(BL40),with acupuncture at Chize(LU5)and moxibustion at both acupoints as control interventions.Design,setting,participants and interventions:In this randomized controlled trial,140 healthy participants were equally divided into four groups:acupuncture at BL40(Acu-BL40),acupuncture at LU5(Acu-LU5),moxibustion at BL40(Mox-BL40)and moxibustion at LU5(Mox-LU5).Participants underwent a 30-minute session of their assigned treatment.Infrared thermal imaging was used to collect temperature data on the areas of interest for analysis.Main outcome measures:The primary measure was the change in average temperature of the observed area after the intervention.The secondary measures included periodic temperature changes every5 min and the temperature changes of the Governor Vessel and Bladder Meridian in the observed area after the intervention.Results:Significant interactions were observed between treatments and acupoints affecting temperature(P<0.001).The Acu-BL40 group showed a notably higher increase in mean temperature after 30 min compared to the Acu-LU5 and Mox-BL40 groups,with increases of 0.29(95%confidence interval[CI]=0.17 to 0.41)and 0.24(95%CI=0.08 to 0.41)℃,respectively.Conclusion:Acupuncture at BL40 acupoint can significantly increase the mean temperature in the observed area,highlighting the specific thermal effect of acupuncture compared to moxibustion in the lumbar area.This suggests a potential therapeutic benefit of acupuncture at BL40 for managing lumbar conditions.
