4篇
您的检索式：作者名="MENG Xuchao"
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| 1 | Predicting Cadmium Safety Thresholds in Soils Based on Cadmium Uptake by Chinese Cabbage显示文摘Cadmium(Cd), a common toxic heavy metal in soil, has relatively high bioavailability, which seriously threatens agricultural products. In this study, 8 different soils with contrasting soil properties were collected from different regions in China to investigate the Cd transfer coefficient from soil to Chinese cabbage(Brassica chinensis L.) and the threshold levels of Cd in soils for production of Chinese cabbage according to the food safety standard for Cd. Exogenous Cd(0–4 mg kg^(-1)) was added to the soils and equilibrated for 2 weeks before Chinese cabbage was grown under greenhouse conditions. The influence of soil properties on the relationship between soil and cabbage Cd concentrations was investigated. The results showed that Cd concentration in the edible part of Chinese cabbage increased linearly with soil Cd concentration in 5 soils, but showed a curvilinear pattern with a plateau at the highest dose of exogenous Cd in the other 3 soils. The Cd transfer coefficient from soil to plant varied significantly among the different soils and decreased with increasing soil p H from 4.7 to 7.5. However, further increase in soil pH to > 8.0 resulted in a significant decrease in the Cd transfer coefficient. According to the measured Cd transfer coefficient and by reference to the National Food Safety Standards of China, the safety threshold of Cd concentration in soil was predicted to be between 0.12 and 1.7 mg kg^(-1) for the tested soils. The predicted threshold values were higher than the current soil quality standard for Cd in 5 soils, but lower than the standard in the other 3 soils. Regression analysis showed a significant positive relationship between the predicted soil Cd safety threshold value and soil p H in combination with soil organic matter or clay content. | LU Junhe YANG Xinping MENG Xuchao WANG Guoqing LIN Yusuo WANG Yujun ZHAO Fangjie | 2017 | Pedosphere2017，27，3： | 13 |
| 2 | The prevalence of Th17 cells in patients with gastric cancer显示文摘 | Bin Zhang Guanghua Rong Huafeng Wei Meng Zhang Jianwei Bi Liye Ma Xuchao Xue Guo Wei Xiaokang Liu Guoen Fang | 2008 | Biochemical and Biophysical Research Communications2008，，3： | 1 |
| 3 | The prevalence of Th17 cells in patients with gastric cancer显示文摘 | Bin Zhang Guanghua Rong Huafeng Wei Meng Zhang Jianwei Bi Liye Ma Xuchao Xue Guo Wei Xiaokang Liu Guoen Fang | 2008 | Biochemical and Biophysical Research Communications2008，，3： | 1 |
| 4 | Characteristics of runoff and sediment yield for two typical erodible soils in southern China显示文摘Granite red soil(GRS)and Quaternary red clay(QRC)are two typical erodible soils in the red-soil region of southern China.Analytical and comparative studies of the characteristics of runoff and sediment yield for the two soils at various slopes are currently needed.The purpose of the current study was to clarify the characteristics of runoff and sediment yield for GRS and QRC at different slopes and to establish models for estimating sediment yield for the two soils.Forty-eight runoff microplots with four slopes(5°,15°,25°,and 35°)and two soils(GRS and QRC)were established and exposed to natural rainfall.Runoff and sediment yield were measured 10 times during the study period.Runoff and sediment yield for the two soils under the various slopes had similar temporal variations,and both increased with prior cumulative erosive rainfall.Runoff for GRS and QRC was moderately temporally variable,with coefficients of variation(CVs)from 46.2%to 60.6%,and sediment yield for QRC was strongly temporally variable,with CVs from 114.8%to 145.8%.Sediment yield for GRS increased with slope,but sediment yield for QRC first increased and then decreased,with a calculated inflection point of 18°,but runoff for both soils decreased with slope.The CVs of both runoff and sediment yield with slope for the two soils ranged from 3.6%to 88.0%,lower than the temporal variabilities,indicating that rainfall may have a larger impact than slope on runoff and sediment yield for QRC and GRS.Under the various slopes,runoff and sediment yield for both soils increased with rainfall and sediment yield increased with runoff,but the proportions of effective rainfall and runoff differed.Pedotransfer-function models based on rainfall,runoff,and slope accurately estimated sediment yield for the two soils,with the model fit coefficient of determination(R^(2))>0.81 and the R^(2)for verification>0.79.These results improve the understanding of the laws governing erosion for different soil types in the red-soil region of southern China and are important for managing the erosion of collapsing gullies and sloping farmland in the region. | Xuchao Zhu Yin Liang Lili Qu Longxi Cao Zhiyuan Tian Tong Liu Meng Li | 2022 | International Journal of Sediment Research2022，37，5： | 0 |
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