There is still very little information on the sources of water absorbed by oil palm plant. This information is very important for water management system in oil palm plantation. Thus, this study was carried out to det...There is still very little information on the sources of water absorbed by oil palm plant. This information is very important for water management system in oil palm plantation. Thus, this study was carried out to determine current water sources absorbed by the oil palm roots using oxygen (δ18O) and deuterium isotopes (δD) techniques. Sketches of oxygen and deuterium isotope were total rainfall, throughfall, runoff, measurement at 5 soil depths (namely: 20 cm, 50 cm, 100 cm, 150 cm, and 200 cm), and oil palm stem. Results of this study showed huge variance in the values of oxygen and deuterium isotope. Based on Least Significant Difference (LSD) test, there was no significant value in the oxygen and deuterium isotope of stem water and others;however, a similar value was obtained at the depths of 0 - 20 cm and 20 - 50 cm with the stem water. This indicated that oil palm absorbed water from 0 - 50 cm depth. This result agreed with the oil palm rooting system, which has verified that the root quarter is the most active root of oil palm.展开更多
The concentration of the heavy isotope of hydrogen, deuterium (D), is not routinely measured in (human) medical laboratory tests, even though an increasing number of papers prove the pivotal role of D in tumor growth,...The concentration of the heavy isotope of hydrogen, deuterium (D), is not routinely measured in (human) medical laboratory tests, even though an increasing number of papers prove the pivotal role of D in tumor growth, cell cycle regulation, cell metabolism, and aging. Data from a prospective phase 2 clinical study and numerous retrospective clinical studies proved the anticancer effect of deuterium depletion achieved by replacing the regular water intake with deuterium-depleted water (DDW). In previous studies, the changes in serum D concentration of DDW-consuming patients were followed using blood samples and mass spectrometry, which was invasive, costly, and time-consuming. As future clinical trials will also require a follow-up of internal D level and the patient’s compliance, a new sampling device and procedure was developed based on condensing the exhaled breath water vapor and measuring its D content using a liquid water isotope laser analyzer. Test results showed that the device provided accurate, reliable, and reproducible data. According to the data, the internal D level in a person consuming normal water was stable. In contrast, exclusive consumption of DDW for several days resulted in a gradual decrease of D concentration in exhaled breath condensate (EBC), which was proportional to the D concentration of DDW. These data confirm that orally applied DDW equilibrates with the person’s water pool quickly, leading to a reduced internal D level reflected in the D content of EBC.展开更多
The δD and δ18O vertical profiles of soil water were measured prior to and after a rainfall event.Mechanisms of soil water movement were deciphered by comparing the soil water isotope profiles with the isotopic comp...The δD and δ18O vertical profiles of soil water were measured prior to and after a rainfall event.Mechanisms of soil water movement were deciphered by comparing the soil water isotope profiles with the isotopic composition of precipitation.The results show that evaporation at the upper depth led to enrichment of the heavy isotopes.Compared to the loess profile,the shallow soil water of sand profile is relatively enriched in D and 18O due to macro-pore and low water-holding capacity.The precipitation is infiltrated into soil in piston mode,accompanied with significant mixing of older soil water.The preferential fluid flow in loess was observed at depths of 0-20 cm,caused by cracks in the depths.The hydrogen and oxygen isotopic compositions in outflow are close to the precipitation,which shows a mixing of the precipitation and old soil water,and indicates that the isotopic composition of outflow water is mainly controlled by that of the precipitation.The δD and δ18O in outflow decreased with time until stable δ values of outflow are close to those of the precipitation.展开更多
文章通过80组不同地热田的样品,分析总结了北京地区地热水资源氘过量参数的特征:(1)地热水的平均δ值为5.4,常温地下水的平均d值为6.04,热水的d值与氚值都较低,水岩作用所导致的氧同位素交换比冷水更容易进行;(2)地下热水的氢和氧同位...文章通过80组不同地热田的样品,分析总结了北京地区地热水资源氘过量参数的特征:(1)地热水的平均δ值为5.4,常温地下水的平均d值为6.04,热水的d值与氚值都较低,水岩作用所导致的氧同位素交换比冷水更容易进行;(2)地下热水的氢和氧同位素组成具有明显的热交换趋势,d值随地下水年龄增大而递增,当地热水年龄为(12.76±0.13)ka时,d值为11.2,而当地热水年龄为(38.96±0.63)ka,d值为14.6;(3)在同一地区,d值随着地下水埋深加大而减小,埋深为125.13 m时d值为5.72,埋深为3221 m时,d值为3.03;(4)从补给源到排泄区,地下水的d值应逐渐降低,其中北部补给区平均d值为7.31,北京断陷盆地平均d值为5.68,南部凤河营地区仅为-9.20;补给源区与排泄区水的d的差值越大,地下水的运动速度越慢;(5)当Eh小于200 m V时,北京地区地下热水的d值随着Eh值的降低而减少,如在桐热-7中,氧化还原电位为-326 m V,d值为-9.20,而在TR-43中氧化还原电位为158 m V,d值为7.48;当Eh大于200 m V时,地下热水的d值随着Eh值的降低而增加,但增幅较小。展开更多
文摘There is still very little information on the sources of water absorbed by oil palm plant. This information is very important for water management system in oil palm plantation. Thus, this study was carried out to determine current water sources absorbed by the oil palm roots using oxygen (δ18O) and deuterium isotopes (δD) techniques. Sketches of oxygen and deuterium isotope were total rainfall, throughfall, runoff, measurement at 5 soil depths (namely: 20 cm, 50 cm, 100 cm, 150 cm, and 200 cm), and oil palm stem. Results of this study showed huge variance in the values of oxygen and deuterium isotope. Based on Least Significant Difference (LSD) test, there was no significant value in the oxygen and deuterium isotope of stem water and others;however, a similar value was obtained at the depths of 0 - 20 cm and 20 - 50 cm with the stem water. This indicated that oil palm absorbed water from 0 - 50 cm depth. This result agreed with the oil palm rooting system, which has verified that the root quarter is the most active root of oil palm.
文摘The concentration of the heavy isotope of hydrogen, deuterium (D), is not routinely measured in (human) medical laboratory tests, even though an increasing number of papers prove the pivotal role of D in tumor growth, cell cycle regulation, cell metabolism, and aging. Data from a prospective phase 2 clinical study and numerous retrospective clinical studies proved the anticancer effect of deuterium depletion achieved by replacing the regular water intake with deuterium-depleted water (DDW). In previous studies, the changes in serum D concentration of DDW-consuming patients were followed using blood samples and mass spectrometry, which was invasive, costly, and time-consuming. As future clinical trials will also require a follow-up of internal D level and the patient’s compliance, a new sampling device and procedure was developed based on condensing the exhaled breath water vapor and measuring its D content using a liquid water isotope laser analyzer. Test results showed that the device provided accurate, reliable, and reproducible data. According to the data, the internal D level in a person consuming normal water was stable. In contrast, exclusive consumption of DDW for several days resulted in a gradual decrease of D concentration in exhaled breath condensate (EBC), which was proportional to the D concentration of DDW. These data confirm that orally applied DDW equilibrates with the person’s water pool quickly, leading to a reduced internal D level reflected in the D content of EBC.
基金Supported by the National University Foundation of China (Grant No.50809024)the National Natural Science Foundation of China (Grant No 40973001)
文摘The δD and δ18O vertical profiles of soil water were measured prior to and after a rainfall event.Mechanisms of soil water movement were deciphered by comparing the soil water isotope profiles with the isotopic composition of precipitation.The results show that evaporation at the upper depth led to enrichment of the heavy isotopes.Compared to the loess profile,the shallow soil water of sand profile is relatively enriched in D and 18O due to macro-pore and low water-holding capacity.The precipitation is infiltrated into soil in piston mode,accompanied with significant mixing of older soil water.The preferential fluid flow in loess was observed at depths of 0-20 cm,caused by cracks in the depths.The hydrogen and oxygen isotopic compositions in outflow are close to the precipitation,which shows a mixing of the precipitation and old soil water,and indicates that the isotopic composition of outflow water is mainly controlled by that of the precipitation.The δD and δ18O in outflow decreased with time until stable δ values of outflow are close to those of the precipitation.
文摘文章通过80组不同地热田的样品,分析总结了北京地区地热水资源氘过量参数的特征:(1)地热水的平均δ值为5.4,常温地下水的平均d值为6.04,热水的d值与氚值都较低,水岩作用所导致的氧同位素交换比冷水更容易进行;(2)地下热水的氢和氧同位素组成具有明显的热交换趋势,d值随地下水年龄增大而递增,当地热水年龄为(12.76±0.13)ka时,d值为11.2,而当地热水年龄为(38.96±0.63)ka,d值为14.6;(3)在同一地区,d值随着地下水埋深加大而减小,埋深为125.13 m时d值为5.72,埋深为3221 m时,d值为3.03;(4)从补给源到排泄区,地下水的d值应逐渐降低,其中北部补给区平均d值为7.31,北京断陷盆地平均d值为5.68,南部凤河营地区仅为-9.20;补给源区与排泄区水的d的差值越大,地下水的运动速度越慢;(5)当Eh小于200 m V时,北京地区地下热水的d值随着Eh值的降低而减少,如在桐热-7中,氧化还原电位为-326 m V,d值为-9.20,而在TR-43中氧化还原电位为158 m V,d值为7.48;当Eh大于200 m V时,地下热水的d值随着Eh值的降低而增加,但增幅较小。
