Restoration of mining soils is important to the vegetation and environment.This study aimed to explore the variations in soil nutrient contents,microbial abundance,and biomass under different gradients of substrate am...Restoration of mining soils is important to the vegetation and environment.This study aimed to explore the variations in soil nutrient contents,microbial abundance,and biomass under different gradients of substrate amendments in mining soils to select effective measures.Soil samples were collected from the Bayan Obo mining region in Inner Mongolia Autonomous Region,China.Contents of soil organic matter(SOM),available nitrogen(AN),available phosphorus(AP),available potassium(AK),microbial biomass carbon/microbial biomass nitrogen(MBC/MBN)ratio,biomass,and bacteria,fungi,and actinomycetes abundance were assessed in Agropyron cristatum L.Gaertn.,Elymus dahuricus Turcz.,and Medicago sativa L.soils with artificial zeolite(AZ)and microbial fertilizer(MF)applied at T0(0 g/kg),T1(5 g/kg),T2(10 g/kg),and T3(20 g/kg).Redundancy analysis(RDA)and technique for order preference by similarity to ideal solution(TOPSIS)were used to identify the main factors controlling the variation of biomass.Results showed that chemical indices and microbial content of restored soils were far greater than those of control.The application of AZ significantly increases SOM,AN,and AP by 20.27%,23.61%,and 40.43%,respectively.AZ significantly increased bacteria,fungi,and actinomycetes abundance by 0.63,3.12,and 1.93 times of control,respectively.RDA indicated that AN,MBC/MBN ratio,and SOM were dominant predictors for biomass across samples with AZ application,explaining 87.6%of the biomass variance.SOM,MBC/MBN ratio,and AK were dominant predictors with MF application,explaining 82.9%of the biomass variance.TOPSIS indicated that T2 was the best dosage and the three plant species could all be used to repair mining soils.AZ and MF application at T2 concentration in the mining soils with M.sativa was found to be the most appropriate measure.展开更多
目的利用血氧水平依赖磁共振成像(blood oxygenation level dependent magnetic resonance imaging,BOLD MRI)技术探讨2型糖尿病患者不同尿微量白蛋白与肌酐比值(the ratio of urinary albumin and creatinine,ACR)与肾脏氧合状态的关...目的利用血氧水平依赖磁共振成像(blood oxygenation level dependent magnetic resonance imaging,BOLD MRI)技术探讨2型糖尿病患者不同尿微量白蛋白与肌酐比值(the ratio of urinary albumin and creatinine,ACR)与肾脏氧合状态的关系。方法对44例2型糖尿病患者及14例健康志愿者(对照组)行肾脏BOLD MRI检查,糖尿病患者根据ACR分为ACR正常糖尿病组(22例)、早期糖尿病肾病组(10例)、临床糖尿病肾病组(12例),分别测量肾脏皮质、髓质的表观自旋-自旋弛豫率(apparent relaxation rate,R2)值并进行组间比较及分析其与临床指标的相关性。结果相比正常对照组,ACR正常糖尿病组(P=0.015)、临床糖尿病肾病组(P=0.023)的肾脏髓质R2值明显增加,差异有统计学意义;早期糖尿病肾病组较对照组的肾脏髓质R2值升高,但差异无统计学意义;糖尿病各组较对照组的肾脏皮质R2值升高,但差异无统计学意义。ACR与髓质R2值呈正相关(r=0.409,P=0.006)。结论BOLD MRI可无创评估糖尿病患者ACR不同阶段的肾脏氧合水平,监测糖尿病患者早期肾髓质功能性缺氧改变。展开更多
基金supported by the Beijing Forestry University(BJFU),China。
文摘Restoration of mining soils is important to the vegetation and environment.This study aimed to explore the variations in soil nutrient contents,microbial abundance,and biomass under different gradients of substrate amendments in mining soils to select effective measures.Soil samples were collected from the Bayan Obo mining region in Inner Mongolia Autonomous Region,China.Contents of soil organic matter(SOM),available nitrogen(AN),available phosphorus(AP),available potassium(AK),microbial biomass carbon/microbial biomass nitrogen(MBC/MBN)ratio,biomass,and bacteria,fungi,and actinomycetes abundance were assessed in Agropyron cristatum L.Gaertn.,Elymus dahuricus Turcz.,and Medicago sativa L.soils with artificial zeolite(AZ)and microbial fertilizer(MF)applied at T0(0 g/kg),T1(5 g/kg),T2(10 g/kg),and T3(20 g/kg).Redundancy analysis(RDA)and technique for order preference by similarity to ideal solution(TOPSIS)were used to identify the main factors controlling the variation of biomass.Results showed that chemical indices and microbial content of restored soils were far greater than those of control.The application of AZ significantly increases SOM,AN,and AP by 20.27%,23.61%,and 40.43%,respectively.AZ significantly increased bacteria,fungi,and actinomycetes abundance by 0.63,3.12,and 1.93 times of control,respectively.RDA indicated that AN,MBC/MBN ratio,and SOM were dominant predictors for biomass across samples with AZ application,explaining 87.6%of the biomass variance.SOM,MBC/MBN ratio,and AK were dominant predictors with MF application,explaining 82.9%of the biomass variance.TOPSIS indicated that T2 was the best dosage and the three plant species could all be used to repair mining soils.AZ and MF application at T2 concentration in the mining soils with M.sativa was found to be the most appropriate measure.
文摘目的利用血氧水平依赖磁共振成像(blood oxygenation level dependent magnetic resonance imaging,BOLD MRI)技术探讨2型糖尿病患者不同尿微量白蛋白与肌酐比值(the ratio of urinary albumin and creatinine,ACR)与肾脏氧合状态的关系。方法对44例2型糖尿病患者及14例健康志愿者(对照组)行肾脏BOLD MRI检查,糖尿病患者根据ACR分为ACR正常糖尿病组(22例)、早期糖尿病肾病组(10例)、临床糖尿病肾病组(12例),分别测量肾脏皮质、髓质的表观自旋-自旋弛豫率(apparent relaxation rate,R2)值并进行组间比较及分析其与临床指标的相关性。结果相比正常对照组,ACR正常糖尿病组(P=0.015)、临床糖尿病肾病组(P=0.023)的肾脏髓质R2值明显增加,差异有统计学意义;早期糖尿病肾病组较对照组的肾脏髓质R2值升高,但差异无统计学意义;糖尿病各组较对照组的肾脏皮质R2值升高,但差异无统计学意义。ACR与髓质R2值呈正相关(r=0.409,P=0.006)。结论BOLD MRI可无创评估糖尿病患者ACR不同阶段的肾脏氧合水平,监测糖尿病患者早期肾髓质功能性缺氧改变。
