The Tongbai Mountains is an ecologically sensi-tive region and the northern boundary of Pinus massoniana Lamb.To analyze the effect of different microenvironments on tree growth response to climate factors,we develope...The Tongbai Mountains is an ecologically sensi-tive region and the northern boundary of Pinus massoniana Lamb.To analyze the effect of different microenvironments on tree growth response to climate factors,we developed standard chronologies for earlywood width(EWW),late-wood width(LWW),and total ring width(TRW)of P.massoniana at two sampling sites on slopes with different orientations,then analyzed characteristics of the chronolo-gies and their correlations with climate variables from five stations in the region and with a regional normalized differ-ence vegetation index(NDVI).Statistical results showed that the TRW/EWW/LWW chronology consistency and charac-teristics(mean sensitivity,signal to noise ratio,expressed population signal)for trees growing on the southeastern slope were much higher than for trees on the northeastern slope.Correlations indicated that temperature in current March and August has a significant positive effect on TRW/EWW/LWW formation,and the effect on the northeastern slope was weaker than on the southeastern slope.Compared to temperature,precipitation has more complicated effects on tree growth,but the effect on the northeastern slope was also generally weaker than on the southeastern slope.Step-wise linear regression analyses showed that temperature in August was the main limiting factor at the two sampling sites.Similarly,the response of tree growth on the southeast-ern slope as determined by the NDVI is better than on the northeastern slope,and the TRW/EWW/LWW chronologies for the southeastern slope explained over 50%of the total NDVI variances in June.Overall,the results indicate that the difference in the climate response of P.massoniana at two sampling sites is clearly caused by differences in the microenvironment,and such differences should be properly considered in future studies of forest dynamics and climate reconstructions.展开更多
Global warming will affect growth strategies and how trees will adapt.To compare the response of tree radial growth to climate warming in different slope directions,samples of Pinus armandii Franch were collected and ...Global warming will affect growth strategies and how trees will adapt.To compare the response of tree radial growth to climate warming in different slope directions,samples of Pinus armandii Franch were collected and treering chronologies developed on northern and western slopes from the Lubanling in the Funiu Mountains.Correlation analyses showed that two chronologies were mainly limited by temperatures in the previous June–August and the combination of temperatures and moisture in the current May–July.The difference of the climate response to slopes was small but not negligible.Radial growth of the LBL01 site on the northern slope was affected by the combined maximum and minimum temperatures,while that of the LBL02 site was affected by maximum temperatures.With regards to moisture,radial growth of the trees on the north slope was influenced by the relative humidity in the current May–July,while on the western slope,it was affected by the relative humidity in the previous June–August,the current May–July and the precipitation in the current May–July.With the change in climate,the effects of the main limiting factors on growth on different slopes were visible to a certain extent,but the differences in response of trees on different slopes gradually decreased,which might be caused by factors such as different slope directions and the change in diurnal temperature range.These results may provide information for forest protection and ecological construction in this region,and a scientific reference for future climate reconstruction.展开更多
A set of standard chronologies for tree-ring width(TRW),earlywood width(EWW)and latewood width(LWW)in Pinus tabuliformis Carr.along an altitudi-nal gradient(1450,1400,and 1350 m a.s.l.)on Baiyunshan Mountain,Central C...A set of standard chronologies for tree-ring width(TRW),earlywood width(EWW)and latewood width(LWW)in Pinus tabuliformis Carr.along an altitudi-nal gradient(1450,1400,and 1350 m a.s.l.)on Baiyunshan Mountain,Central China to analyze the effect of varying temperature and precipitation on growth along the gradi-ent.Correlation analyses showed that at all three altitudes and the TRW and EWW chronologies generally had signifi-cant negative correlations with mean and maximum tem-peratures in the current April and May and with minimum temperatures in the prior July and August,but significant positive correlations with precipitation in the current May.Correlations were generally significantly negative between LWW chronologies and all temperatures in the prior July and August,indicating that the prior summer temperature had a strong lag effect on the growth of P.tabuliformis that increased with altitude.The correlation with the standard-ized precipitation evapotranspiration index(SPEI)confirmed that wet conditions in the current May promoted growth of TR and EW at all altitudes.Significant altitudinal differences were also found;at 1400 m,there were significant positive correlations between EWW chronologies and SPEI in the current April and significant negative correlations between LWW chronologies and SPEI in the current September,but these correlations were not significant at 1450 m.At 1350 m,there were also significant negative correlations between the TRW and the EWW chronologies and SPEI in the prior October and the current July and between LWW chronology and SPEI in the current August,but these cor-relations were not significant at 1400 m.Moving correlation results showed a stable response of EWW in relation to the SPEI in the current May at all three altitudes and of LWW to maximum temperature in the prior July-August at 1400 m from 2002 to 2018.The EWW chronology at 1400 m and the LWW chronology at 1450 m were identified as more suitable for climate reconstruction.These results provide a strong scientific basis for forest management decisions and climate reconstructions in Central China.展开更多
目的观察益肠散结方联合化疗治疗脾虚痰瘀证晚期结直肠癌患者的临床疗效及安全性,并探讨肠道菌群、血清黑色素瘤缺乏因子2(absent in melanoma 2,AIM2)、免疫功能之间相关性。方法将晚期结直肠癌脾气亏虚、痰瘀互结证患者84例,随机分为...目的观察益肠散结方联合化疗治疗脾虚痰瘀证晚期结直肠癌患者的临床疗效及安全性,并探讨肠道菌群、血清黑色素瘤缺乏因子2(absent in melanoma 2,AIM2)、免疫功能之间相关性。方法将晚期结直肠癌脾气亏虚、痰瘀互结证患者84例,随机分为治疗组、对照组,治疗组采用益肠散结颗粒联合化疗,对照组采用安慰剂联合化疗,14天为1个疗程,共8个疗程。观察两组治疗前后中医证候、卡氏评分、免疫功能、血清AIM2表达水平、肠道菌群等方面及安全性分析。结果治疗后两组比较,治疗组能够提高中医证候治疗有效率(P<0.01);提高KPS评分,组间比较差异有统计学意义(P<0.05);治疗前后组内比较,治疗组NK细胞计数、CD^(4+)显著升高(P<0.01),CD^(8+)、CD^(4+)/CD^(8+)变化不明显(P>0.05);对照组CD^(4+)显著升高(P<0.01),NK细胞计数、CD^(8+)、CD^(4+)/CD^(8+)变化不明显(P>0.05)。组间比较,治疗后治疗组NK细胞计数改善情况优于对照组(P<0.05),其他的观察指标组间比较差异无统计学意义(P>0.05);治疗组化疗后血清AIM2 m RNA转录水平明显高于治疗前(P<0.05)。4周期化疗后与8周期化疗后相比,血清AIM2 m RNA水平组内比较差异没有统计学意义(P>0.05);肠道菌群检测,治疗组化疗后的多样性比治疗组化疗前、对照组化疗前后均有提高,但差异无统计学意义(P>0.05);且Romboutsia、Intestinibacter能提高肠道的防御能力。结论益肠散结方联合化疗可以改善晚期结直肠癌患者中医证候,提高化疗后体能状况,调整肠道菌群,提高机体免疫力,增强抵抗感染的能力,且安全有效。展开更多
BACKGROUND Controversy exists as to the optimal treatment approach for ostial left anterior descending(LAD)or ostial left circumflex artery(LCx)lesions.Drug-coated balloons(DCB)may overcome some of the limitations of ...BACKGROUND Controversy exists as to the optimal treatment approach for ostial left anterior descending(LAD)or ostial left circumflex artery(LCx)lesions.Drug-coated balloons(DCB)may overcome some of the limitations of drug-eluting stents(DES).Therefore,we investigated the security and feasibility of the DCB policy in patients with ostial LAD or ostial LCx lesions,and compared it with the conventional DES-only strategy.METHODS We retrospectively enrolled patients with de novo ostial lesions in the LAD or LCx who underwent interventional treatment.They were categorized into two groups based on their treatment approach:the DCB group and the DES group.The treatment strategies in the DCB group involved the use of either DCB-only or hybrid strategies,whereas the DES group utilized crossover or precise stenting techniques.Two-year target lesion revascularization was the primary endpoint,while the rates of major adverse cardiovascular events,cardiac death,target vessel myocardial infarction,and vessel thrombosis were the secondary endpoints.Using propensity score matching,we assembled a cohort with comparable baseline characteristics.To ensure result analysis reliability,we conducted sensitivity analyses,including interaction,and stratified analyses.RESULTS Among the 397 eligible patients,6.25%of patients who were planned to undergo DCB underwent DES.A total of 108 patients in each group had comparable propensity scores and were included in the analysis.Two-year target lesion revascularization occurred in 5 patients(4.90%)and 16 patients(16.33%)in the DCB group and the DES group,respectively(odds ratio=0.264,95%CI:0.093–0.752,P=0.008).Compared with the DES group,the DCB group demonstrated a lower major adverse cardiovascular events rate(7.84%vs.19.39%,P=0.017).However,differences with regard to cardiac death,non-periprocedural target vessel myocardial infarction,and definite or probable vessel thrombosis between the groups were non-significant.CONCLUSIONS The utilization of the DCB approach signifies an innovative and discretionary strategy for managing isolated ostial lesions in the LAD or LCx.Nevertheless,a future randomized trial investigating the feasibility and safety of DCB compared to the DES-only strategy specifically for de novo ostial lesions in the LAD or LCx is highly warranted.展开更多
基金This study was supported by National Key Research and Development Program of China(No.2018YFA0605601)National Natural Science Foundation of China(No.42077417 and41671042).
文摘The Tongbai Mountains is an ecologically sensi-tive region and the northern boundary of Pinus massoniana Lamb.To analyze the effect of different microenvironments on tree growth response to climate factors,we developed standard chronologies for earlywood width(EWW),late-wood width(LWW),and total ring width(TRW)of P.massoniana at two sampling sites on slopes with different orientations,then analyzed characteristics of the chronolo-gies and their correlations with climate variables from five stations in the region and with a regional normalized differ-ence vegetation index(NDVI).Statistical results showed that the TRW/EWW/LWW chronology consistency and charac-teristics(mean sensitivity,signal to noise ratio,expressed population signal)for trees growing on the southeastern slope were much higher than for trees on the northeastern slope.Correlations indicated that temperature in current March and August has a significant positive effect on TRW/EWW/LWW formation,and the effect on the northeastern slope was weaker than on the southeastern slope.Compared to temperature,precipitation has more complicated effects on tree growth,but the effect on the northeastern slope was also generally weaker than on the southeastern slope.Step-wise linear regression analyses showed that temperature in August was the main limiting factor at the two sampling sites.Similarly,the response of tree growth on the southeast-ern slope as determined by the NDVI is better than on the northeastern slope,and the TRW/EWW/LWW chronologies for the southeastern slope explained over 50%of the total NDVI variances in June.Overall,the results indicate that the difference in the climate response of P.massoniana at two sampling sites is clearly caused by differences in the microenvironment,and such differences should be properly considered in future studies of forest dynamics and climate reconstructions.
基金the National Natural Science Foundation of China(No.4207741741671042)。
文摘Global warming will affect growth strategies and how trees will adapt.To compare the response of tree radial growth to climate warming in different slope directions,samples of Pinus armandii Franch were collected and treering chronologies developed on northern and western slopes from the Lubanling in the Funiu Mountains.Correlation analyses showed that two chronologies were mainly limited by temperatures in the previous June–August and the combination of temperatures and moisture in the current May–July.The difference of the climate response to slopes was small but not negligible.Radial growth of the LBL01 site on the northern slope was affected by the combined maximum and minimum temperatures,while that of the LBL02 site was affected by maximum temperatures.With regards to moisture,radial growth of the trees on the north slope was influenced by the relative humidity in the current May–July,while on the western slope,it was affected by the relative humidity in the previous June–August,the current May–July and the precipitation in the current May–July.With the change in climate,the effects of the main limiting factors on growth on different slopes were visible to a certain extent,but the differences in response of trees on different slopes gradually decreased,which might be caused by factors such as different slope directions and the change in diurnal temperature range.These results may provide information for forest protection and ecological construction in this region,and a scientific reference for future climate reconstruction.
基金This research was funded by National Key Research and Development Program of China(No.2018YFA0605601)National Natural Science Foundation of China(No.42077417,41671042).
文摘A set of standard chronologies for tree-ring width(TRW),earlywood width(EWW)and latewood width(LWW)in Pinus tabuliformis Carr.along an altitudi-nal gradient(1450,1400,and 1350 m a.s.l.)on Baiyunshan Mountain,Central China to analyze the effect of varying temperature and precipitation on growth along the gradi-ent.Correlation analyses showed that at all three altitudes and the TRW and EWW chronologies generally had signifi-cant negative correlations with mean and maximum tem-peratures in the current April and May and with minimum temperatures in the prior July and August,but significant positive correlations with precipitation in the current May.Correlations were generally significantly negative between LWW chronologies and all temperatures in the prior July and August,indicating that the prior summer temperature had a strong lag effect on the growth of P.tabuliformis that increased with altitude.The correlation with the standard-ized precipitation evapotranspiration index(SPEI)confirmed that wet conditions in the current May promoted growth of TR and EW at all altitudes.Significant altitudinal differences were also found;at 1400 m,there were significant positive correlations between EWW chronologies and SPEI in the current April and significant negative correlations between LWW chronologies and SPEI in the current September,but these correlations were not significant at 1450 m.At 1350 m,there were also significant negative correlations between the TRW and the EWW chronologies and SPEI in the prior October and the current July and between LWW chronology and SPEI in the current August,but these cor-relations were not significant at 1400 m.Moving correlation results showed a stable response of EWW in relation to the SPEI in the current May at all three altitudes and of LWW to maximum temperature in the prior July-August at 1400 m from 2002 to 2018.The EWW chronology at 1400 m and the LWW chronology at 1450 m were identified as more suitable for climate reconstruction.These results provide a strong scientific basis for forest management decisions and climate reconstructions in Central China.
文摘目的观察益肠散结方联合化疗治疗脾虚痰瘀证晚期结直肠癌患者的临床疗效及安全性,并探讨肠道菌群、血清黑色素瘤缺乏因子2(absent in melanoma 2,AIM2)、免疫功能之间相关性。方法将晚期结直肠癌脾气亏虚、痰瘀互结证患者84例,随机分为治疗组、对照组,治疗组采用益肠散结颗粒联合化疗,对照组采用安慰剂联合化疗,14天为1个疗程,共8个疗程。观察两组治疗前后中医证候、卡氏评分、免疫功能、血清AIM2表达水平、肠道菌群等方面及安全性分析。结果治疗后两组比较,治疗组能够提高中医证候治疗有效率(P<0.01);提高KPS评分,组间比较差异有统计学意义(P<0.05);治疗前后组内比较,治疗组NK细胞计数、CD^(4+)显著升高(P<0.01),CD^(8+)、CD^(4+)/CD^(8+)变化不明显(P>0.05);对照组CD^(4+)显著升高(P<0.01),NK细胞计数、CD^(8+)、CD^(4+)/CD^(8+)变化不明显(P>0.05)。组间比较,治疗后治疗组NK细胞计数改善情况优于对照组(P<0.05),其他的观察指标组间比较差异无统计学意义(P>0.05);治疗组化疗后血清AIM2 m RNA转录水平明显高于治疗前(P<0.05)。4周期化疗后与8周期化疗后相比,血清AIM2 m RNA水平组内比较差异没有统计学意义(P>0.05);肠道菌群检测,治疗组化疗后的多样性比治疗组化疗前、对照组化疗前后均有提高,但差异无统计学意义(P>0.05);且Romboutsia、Intestinibacter能提高肠道的防御能力。结论益肠散结方联合化疗可以改善晚期结直肠癌患者中医证候,提高化疗后体能状况,调整肠道菌群,提高机体免疫力,增强抵抗感染的能力,且安全有效。
基金supported by the Medical Science and Technique Research Plan of He’nan Province(Provincial and Ministerial Co-construction Project)(SB201901027).
文摘BACKGROUND Controversy exists as to the optimal treatment approach for ostial left anterior descending(LAD)or ostial left circumflex artery(LCx)lesions.Drug-coated balloons(DCB)may overcome some of the limitations of drug-eluting stents(DES).Therefore,we investigated the security and feasibility of the DCB policy in patients with ostial LAD or ostial LCx lesions,and compared it with the conventional DES-only strategy.METHODS We retrospectively enrolled patients with de novo ostial lesions in the LAD or LCx who underwent interventional treatment.They were categorized into two groups based on their treatment approach:the DCB group and the DES group.The treatment strategies in the DCB group involved the use of either DCB-only or hybrid strategies,whereas the DES group utilized crossover or precise stenting techniques.Two-year target lesion revascularization was the primary endpoint,while the rates of major adverse cardiovascular events,cardiac death,target vessel myocardial infarction,and vessel thrombosis were the secondary endpoints.Using propensity score matching,we assembled a cohort with comparable baseline characteristics.To ensure result analysis reliability,we conducted sensitivity analyses,including interaction,and stratified analyses.RESULTS Among the 397 eligible patients,6.25%of patients who were planned to undergo DCB underwent DES.A total of 108 patients in each group had comparable propensity scores and were included in the analysis.Two-year target lesion revascularization occurred in 5 patients(4.90%)and 16 patients(16.33%)in the DCB group and the DES group,respectively(odds ratio=0.264,95%CI:0.093–0.752,P=0.008).Compared with the DES group,the DCB group demonstrated a lower major adverse cardiovascular events rate(7.84%vs.19.39%,P=0.017).However,differences with regard to cardiac death,non-periprocedural target vessel myocardial infarction,and definite or probable vessel thrombosis between the groups were non-significant.CONCLUSIONS The utilization of the DCB approach signifies an innovative and discretionary strategy for managing isolated ostial lesions in the LAD or LCx.Nevertheless,a future randomized trial investigating the feasibility and safety of DCB compared to the DES-only strategy specifically for de novo ostial lesions in the LAD or LCx is highly warranted.
