目的:比较富血小板血浆(platelet rich plasma,PRP)与体外冲击波治疗慢性跟腱止点腱病的临床疗效。方法:2019年2月至2021年8月,根据病例选择最终纳入42例跟腱止点腱病患者,分为PRP组(20例28足)与冲击波组(22例29足)。PRP组男12例,女8例...目的:比较富血小板血浆(platelet rich plasma,PRP)与体外冲击波治疗慢性跟腱止点腱病的临床疗效。方法:2019年2月至2021年8月,根据病例选择最终纳入42例跟腱止点腱病患者,分为PRP组(20例28足)与冲击波组(22例29足)。PRP组男12例,女8例;年龄47.00(28.00,50.75)岁;病程7.00(6.00,7.00)个月;予患侧跟腱止点区域进行富血小板血浆注射治疗。冲击波组男16例,女6例;年龄42.00(35.75,47.25)岁;病程7.00(6.00,8.00)个月;予患侧跟腱止点区及小腿三头肌区域进行冲击波治疗。分别于治疗前及治疗后1、3、6个月采用疼痛视觉模拟评分(visual analogue scale,VAS)及维多利亚体育研究中心跟腱问卷表(Victorian Institute of Sport Assessment-Achilles,VISAA)评分进行疗效评价,并对所有患者进行满意度调查。结果:两组治疗1、3、6个月后VAS及VISA-A评分均较治疗前改善(P<0.05);PRP组治疗6个月后VAS及VISA-A评分均优于治疗后1、3个月(P<0.05);冲击波组治疗6个月后VAS及VISA-A评分均差于治疗后1、3个月(P<0.05);两组治疗前、治疗后1、3个月VAS及VISA-A评分比较差异无统计学意义(P>0.05);PRP组治疗后6个月VAS及VISA-A评分优于冲击波组(P<0.05),PRP组满意度调查优于冲击波组(P<0.05)。结论:PRP注射对于慢性跟腱止点腱病具有良好的临床疗效,患者满意度高,且PRP注射治疗慢性跟腱止点腱病的中长期疗效更优于体外发散式冲击波。展开更多
Climate change is recognized to increase the frequency and severity of extreme temperature events. At flowering and grain filling stages, risk of high temperature stress （HTS） on rice might increase, and lead to dec...Climate change is recognized to increase the frequency and severity of extreme temperature events. At flowering and grain filling stages, risk of high temperature stress （HTS） on rice might increase, and lead to declining grain yields. A regulated cabinet experiment was carried out to investigate effects of high temperature stress on rice growth at flowering and grain- filling stages. Results showed that no obvious decrease pattern in net photosynthesis appeared along with the temperature rising, but the dry matter allocation in leaf, leaf sheath, culm, and panicle all changed. Dry weight of panicle decreased, and ratio of straw to total above ground crop dry weight increased 6-34% from CK, which might have great effects on carbon cycling and green house gas emission. Grain yield decreased significantly across all treatments on average from 15 to 73%. Occurrence of HTS at flowering stage showed more serious influence on grain yield than at grain filling stage. High temperature stress showed negative effects on harvest index. It might be helpful to provide valuable information for crop simulation models to capture the effects of high temperature stress on rice, and evaluate the high temperature risk.展开更多
Chinese iris (Iris lactea Pall. var. chinensis (Fisch) Koidz.), a robust iridaceous plant, is widespread in arid and semiarid regions with high salinity. However, the mechanism of its salt tolerance is not well unders...Chinese iris (Iris lactea Pall. var. chinensis (Fisch) Koidz.), a robust iridaceous plant, is widespread in arid and semiarid regions with high salinity. However, the mechanism of its salt tolerance is not well understood. In this study, plant growth, water status, content and distribution of inorganic ions, cell membrane permeability, and proline content of I. lactea under salt stress were investigated using nutrient solutions with six NaCl concentrations ranging from 0 to 350 mmol L-1. The results indicated that the biomass, height, fresh weight, K+ content, and K+/Na+ and Ca2+/Na+ ratios decreased with increasing NaCl stress, whereas plant water deficit and contents of Na+ and Cl-increased with increasing NaCl stress. In all salt treatments, water deficit of shoots was found to be higher than that of roots and had a positive correlation with salt concentration. When the NaCl concentration was less than 280 mmol L-1, the ion absorption selectivity ratio and the transportation selectivity ratio sharply increased with increasing NaCl stress. Under medium salt stress, I. lactea exhibited a strong K+ selective absorption and the transportation of K+ from roots to shoots increased, whereas Na+ was not transported and was mostly retained in roots. The plants were able to maintain osmotic adjustment through the accumulation of Na+, Cl-, and proline. On the basis of its biomass production under salt stress, I. lactea could be considered as a facultative halophyte.展开更多
The irrigation method used in winter wheat fields affects micro-environment factors, such as relative humidity（RH） within canopy, soil temperature, topsoil bulk density, soil matric potential, and soil nutrients, an...The irrigation method used in winter wheat fields affects micro-environment factors, such as relative humidity（RH） within canopy, soil temperature, topsoil bulk density, soil matric potential, and soil nutrients, and these changes may affect plant root growth.An experiment was carried out to explore the effects of irrigation method on micro-environments and root distribution in a winter wheat field in the 2007–2008 and 2008–2009 growing seasons.The results showed that border irrigation（BI）, sprinkler irrigation（SI）, and surface drip irrigation（SDI） had no significant effects on soil temperature.Topsoil bulk density, RH within the canopy, soil available N distribution, and soil matric potential were significantly affected by the three treatments.The change in soil matric potential was the key reason for the altered root profile distribution patterns.Additionally, more fine roots were produced in the BI treatment when soil water content was low and topsoil bulk density was high.Root growth was most stimulated in the top soil layers and inhibited in the deep layers in the SDI treatment, followed by SI and BI, which was due to the different water application frequencies.As a result, the root profile distribution differed, depending on the irrigation method used.The root distribution pattern changes could be described by the power level variation in the exponential function.A good knowledge of root distribution patterns is important when attempting to model water and nutrient movements and when studying soil-plant interactions.展开更多
Super-absorbent polymers(SAPs)are widely used chemical water-saving materials,which play an active role in the accumulation of soil water and the improvement of soil structure.Little is known about their performance w...Super-absorbent polymers(SAPs)are widely used chemical water-saving materials,which play an active role in the accumulation of soil water and the improvement of soil structure.Little is known about their performance with repeated usage or about factors influencing their efficiency under alternate wetting and drying cycles.In this study,various concentrations of SAP(0,0.1,0.2 and 0.3%)in soil following three continuous wetting and drying cycles(T1,T2 and T3),were studied to determine effects on soil structure stability and hydro-physical properties.The results indicated that the SAP improved soil water supply capacity under conditions of mild drought(T2)and sufficient irrigation(T3)at concentrations of 0.2 and 0.3%,but a reduction was observed under severe drought conditions(T1),which was negatively correlated with the SAP concentration.The physical adsorption of the SAP by soil and the chemical connection between the SAP and soil mineral colloids as Si-O-Si bonds,-OH bonds and different crystalline silica were the important factors that directly lead to the reduction of water retention capacities of the SAP with alternating wet and dry conditions.Compared with the control,the soil liquid phase ratios of the SAP treatments were increased by8.8-202.7%in the T1 and T2 cycles,which would have led to a decrease in the soil air phase ratios.After repeated wetting and drying cycles,the SAP treatments increased the amount of>0.25 mm soil aggregates and the contents of water-stable macro-aggregate(R_(0.25)),and decreased the amount of<0.053 mm soil aggregates,especially with higher concentrations of the SAP.Increases in mean weight diameter(MWD)and geometric mean diameter(GMD),and declines in fractal dimension(D)and unstable aggregates index(E_(LT))were all observed with the SAP treatments,which indicated an improvement in soil stability and structure.It was concluded that the distribution and stability of soil aggregates and soil water supply capacity was closely related to SAP concentration,soil moisture condition and the interaction between the SAP and soil particles.展开更多
为研究不同气候区黄绵土的土壤剖面差异,本研究基于土壤剖面调查数据,分析了半湿润区和半干旱区冬小麦农田的土壤剖面特征及土壤基本属性。结果表明:半湿润区土壤剖面存在明显的犁底层,犁底层土壤容重接近1.60 g cm-3,土壤结构体以片状...为研究不同气候区黄绵土的土壤剖面差异,本研究基于土壤剖面调查数据,分析了半湿润区和半干旱区冬小麦农田的土壤剖面特征及土壤基本属性。结果表明:半湿润区土壤剖面存在明显的犁底层,犁底层土壤容重接近1.60 g cm-3,土壤结构体以片状和棱柱状为主,淋溶层存在显著的石灰性沉积,pH显著高于其他土层;半干旱区无显著犁底层,土壤容重在1.40 g cm-3左右,土壤结构体以块状和团粒为主,没有显著的石灰性沉积;不同区域黄绵土土壤颗粒均以粉砂粒为主,黏粒含量低于10%,半干旱区黏粒含量低于半湿润区;除表层以外,其他各层<0.25 mm水稳性团聚体比例超过50%,不利于蓄积水分养分;有机质、氮及速效磷含量较低是土壤肥力的主要障碍因子。展开更多
文摘目的:比较富血小板血浆(platelet rich plasma,PRP)与体外冲击波治疗慢性跟腱止点腱病的临床疗效。方法:2019年2月至2021年8月,根据病例选择最终纳入42例跟腱止点腱病患者,分为PRP组(20例28足)与冲击波组(22例29足)。PRP组男12例,女8例;年龄47.00(28.00,50.75)岁;病程7.00(6.00,7.00)个月;予患侧跟腱止点区域进行富血小板血浆注射治疗。冲击波组男16例,女6例;年龄42.00(35.75,47.25)岁;病程7.00(6.00,8.00)个月;予患侧跟腱止点区及小腿三头肌区域进行冲击波治疗。分别于治疗前及治疗后1、3、6个月采用疼痛视觉模拟评分(visual analogue scale,VAS)及维多利亚体育研究中心跟腱问卷表(Victorian Institute of Sport Assessment-Achilles,VISAA)评分进行疗效评价,并对所有患者进行满意度调查。结果:两组治疗1、3、6个月后VAS及VISA-A评分均较治疗前改善(P<0.05);PRP组治疗6个月后VAS及VISA-A评分均优于治疗后1、3个月(P<0.05);冲击波组治疗6个月后VAS及VISA-A评分均差于治疗后1、3个月(P<0.05);两组治疗前、治疗后1、3个月VAS及VISA-A评分比较差异无统计学意义(P>0.05);PRP组治疗后6个月VAS及VISA-A评分优于冲击波组(P<0.05),PRP组满意度调查优于冲击波组(P<0.05)。结论:PRP注射对于慢性跟腱止点腱病具有良好的临床疗效,患者满意度高,且PRP注射治疗慢性跟腱止点腱病的中长期疗效更优于体外发散式冲击波。
基金supported by the National Basic Research Program of China (2010CB951302-2)the National Natural Science Foundation of China (51109214 and 31101074)
文摘Climate change is recognized to increase the frequency and severity of extreme temperature events. At flowering and grain filling stages, risk of high temperature stress （HTS） on rice might increase, and lead to declining grain yields. A regulated cabinet experiment was carried out to investigate effects of high temperature stress on rice growth at flowering and grain- filling stages. Results showed that no obvious decrease pattern in net photosynthesis appeared along with the temperature rising, but the dry matter allocation in leaf, leaf sheath, culm, and panicle all changed. Dry weight of panicle decreased, and ratio of straw to total above ground crop dry weight increased 6-34% from CK, which might have great effects on carbon cycling and green house gas emission. Grain yield decreased significantly across all treatments on average from 15 to 73%. Occurrence of HTS at flowering stage showed more serious influence on grain yield than at grain filling stage. High temperature stress showed negative effects on harvest index. It might be helpful to provide valuable information for crop simulation models to capture the effects of high temperature stress on rice, and evaluate the high temperature risk.
基金the National Natural Science Foundation of China (No.30170671).
文摘Chinese iris (Iris lactea Pall. var. chinensis (Fisch) Koidz.), a robust iridaceous plant, is widespread in arid and semiarid regions with high salinity. However, the mechanism of its salt tolerance is not well understood. In this study, plant growth, water status, content and distribution of inorganic ions, cell membrane permeability, and proline content of I. lactea under salt stress were investigated using nutrient solutions with six NaCl concentrations ranging from 0 to 350 mmol L-1. The results indicated that the biomass, height, fresh weight, K+ content, and K+/Na+ and Ca2+/Na+ ratios decreased with increasing NaCl stress, whereas plant water deficit and contents of Na+ and Cl-increased with increasing NaCl stress. In all salt treatments, water deficit of shoots was found to be higher than that of roots and had a positive correlation with salt concentration. When the NaCl concentration was less than 280 mmol L-1, the ion absorption selectivity ratio and the transportation selectivity ratio sharply increased with increasing NaCl stress. Under medium salt stress, I. lactea exhibited a strong K+ selective absorption and the transportation of K+ from roots to shoots increased, whereas Na+ was not transported and was mostly retained in roots. The plants were able to maintain osmotic adjustment through the accumulation of Na+, Cl-, and proline. On the basis of its biomass production under salt stress, I. lactea could be considered as a facultative halophyte.
基金the National Natural Science Foundation of China(51109214,31101074 and 51309211)the National Key Technology Research and Development Program of China(2011BAD32B)the Basic Scientific Research Foundation of National Non-Profit Scientific Institute of China(BSRF201303)
文摘The irrigation method used in winter wheat fields affects micro-environment factors, such as relative humidity（RH） within canopy, soil temperature, topsoil bulk density, soil matric potential, and soil nutrients, and these changes may affect plant root growth.An experiment was carried out to explore the effects of irrigation method on micro-environments and root distribution in a winter wheat field in the 2007–2008 and 2008–2009 growing seasons.The results showed that border irrigation（BI）, sprinkler irrigation（SI）, and surface drip irrigation（SDI） had no significant effects on soil temperature.Topsoil bulk density, RH within the canopy, soil available N distribution, and soil matric potential were significantly affected by the three treatments.The change in soil matric potential was the key reason for the altered root profile distribution patterns.Additionally, more fine roots were produced in the BI treatment when soil water content was low and topsoil bulk density was high.Root growth was most stimulated in the top soil layers and inhibited in the deep layers in the SDI treatment, followed by SI and BI, which was due to the different water application frequencies.As a result, the root profile distribution differed, depending on the irrigation method used.The root distribution pattern changes could be described by the power level variation in the exponential function.A good knowledge of root distribution patterns is important when attempting to model water and nutrient movements and when studying soil-plant interactions.
基金supported by the National Natural Science Foundation of China(41601226)the Agricultural Science and Technology Innovation Project of the Chinese Academy of Agricultural Sciences。
文摘Super-absorbent polymers(SAPs)are widely used chemical water-saving materials,which play an active role in the accumulation of soil water and the improvement of soil structure.Little is known about their performance with repeated usage or about factors influencing their efficiency under alternate wetting and drying cycles.In this study,various concentrations of SAP(0,0.1,0.2 and 0.3%)in soil following three continuous wetting and drying cycles(T1,T2 and T3),were studied to determine effects on soil structure stability and hydro-physical properties.The results indicated that the SAP improved soil water supply capacity under conditions of mild drought(T2)and sufficient irrigation(T3)at concentrations of 0.2 and 0.3%,but a reduction was observed under severe drought conditions(T1),which was negatively correlated with the SAP concentration.The physical adsorption of the SAP by soil and the chemical connection between the SAP and soil mineral colloids as Si-O-Si bonds,-OH bonds and different crystalline silica were the important factors that directly lead to the reduction of water retention capacities of the SAP with alternating wet and dry conditions.Compared with the control,the soil liquid phase ratios of the SAP treatments were increased by8.8-202.7%in the T1 and T2 cycles,which would have led to a decrease in the soil air phase ratios.After repeated wetting and drying cycles,the SAP treatments increased the amount of>0.25 mm soil aggregates and the contents of water-stable macro-aggregate(R_(0.25)),and decreased the amount of<0.053 mm soil aggregates,especially with higher concentrations of the SAP.Increases in mean weight diameter(MWD)and geometric mean diameter(GMD),and declines in fractal dimension(D)and unstable aggregates index(E_(LT))were all observed with the SAP treatments,which indicated an improvement in soil stability and structure.It was concluded that the distribution and stability of soil aggregates and soil water supply capacity was closely related to SAP concentration,soil moisture condition and the interaction between the SAP and soil particles.
文摘为研究不同气候区黄绵土的土壤剖面差异,本研究基于土壤剖面调查数据,分析了半湿润区和半干旱区冬小麦农田的土壤剖面特征及土壤基本属性。结果表明:半湿润区土壤剖面存在明显的犁底层,犁底层土壤容重接近1.60 g cm-3,土壤结构体以片状和棱柱状为主,淋溶层存在显著的石灰性沉积,pH显著高于其他土层;半干旱区无显著犁底层,土壤容重在1.40 g cm-3左右,土壤结构体以块状和团粒为主,没有显著的石灰性沉积;不同区域黄绵土土壤颗粒均以粉砂粒为主,黏粒含量低于10%,半干旱区黏粒含量低于半湿润区;除表层以外,其他各层<0.25 mm水稳性团聚体比例超过50%,不利于蓄积水分养分;有机质、氮及速效磷含量较低是土壤肥力的主要障碍因子。
