The soil CO2 evolution rate was measured in a virpin Korean pine forest. The results in June showed that the lowest value of evolution rate was 220 mg /(m2·h) and appeared at 6:00 a.m. The highest value was 460 m...The soil CO2 evolution rate was measured in a virpin Korean pine forest. The results in June showed that the lowest value of evolution rate was 220 mg /(m2·h) and appeared at 6:00 a.m. The highest value was 460 mg /(m2·h) at 18:00. The rates of CO2 evolution were related with soil temperature. On the basis of the constructed regression equation and the monthly average values of temperature, the magnitude of CO2 evolution from Korean pine forest soil was 10.4 t /hm2 during a growing season.展开更多
CO_(2)capture and storage(CCS)has the risk of CO_(2)leakage,and this leakage always increases soil CO_(2)concentration,and the long-term CO_(2)stress damages crop production in farmland.Using maize,the growth characte...CO_(2)capture and storage(CCS)has the risk of CO_(2)leakage,and this leakage always increases soil CO_(2)concentration,and the long-term CO_(2)stress damages crop production in farmland.Using maize,the growth characteristics,such as plant height and yield,and physiological indexes(osmoregulation substances and antioxidant enzymes)were explored under different simulative CO_(2)leakage conditions.Further,the relationship between maize physiological indexes and soil CO_(2)concentration was analyzed,showing that soil CO_(2)stress inhibited maize growth to a certain extent,resulting in shorter plants,thinner stems and lower kernel yield.With an increase in soil CO_(2)concentration,the contents of malondialdehyde,soluble sugar and soluble protein in maize leaves increased;with continuing stress,the increase rate of malondialdehyde was greatly augmented,whereas the increase rates of soluble sugar and soluble protein decreased.With extended CO_(2)stress,the activity of the enzyme superoxide dismutase(SOD)increased continuously,while the activities of catalase and peroxidase first increased and then decreased.Superoxide dismutase activity was closely correlated with soil CO_(2)concentration(r=0.762),and responded quickly to the change of soil CO_(2)concentration(R~2=0.9951).Therefore,SOD plays an important role in maize resistance to soil CO_(2)stress.This study will help further understanding of the mechanism of maize tolerance to soil CO_(2)stress,providing a theoretical basis for agricultural production in CCS project areas.展开更多
精确预测大气 CO2 的未来变化对于预测全球气候变化是至关重要的。为此 ,需要确定大气 CO2 的源和汇及其随时间的变化。本文作者利用已发表和未发表的资料对一些实例进行了分析 :首先讨论了碳酸盐岩岩溶作用 (包括碳酸盐溶解及再沉积的...精确预测大气 CO2 的未来变化对于预测全球气候变化是至关重要的。为此 ,需要确定大气 CO2 的源和汇及其随时间的变化。本文作者利用已发表和未发表的资料对一些实例进行了分析 :首先讨论了碳酸盐岩岩溶作用 (包括碳酸盐溶解及再沉积的共同影响 )对土壤 CO2和径流变化的敏感性 ;接着利用水化学 -流量方法和碳酸盐岩石片试验方法得出了我国和世界碳酸盐岩地区因碳酸盐岩岩溶作用从大气中吸收的净 CO2 总量 ,即碳酸盐岩岩溶作用对大气 CO2 沉降的贡献。它们分别是 :中国每年 180 0万 t C,整个世界岩溶地区 1.1亿 t C;最后 ,文章据 DBL理论模型计算得出世界碳酸盐岩地区碳酸盐岩溶解吸收CO2 一项产生的大气 CO2 沉降量为每年 4 .1亿 t C,继而得出全世界碳酸盐岩地区因碳酸盐再沉积而释放 CO2 产生的大气 CO2 源项为每年 3亿 t C。展开更多
文摘The soil CO2 evolution rate was measured in a virpin Korean pine forest. The results in June showed that the lowest value of evolution rate was 220 mg /(m2·h) and appeared at 6:00 a.m. The highest value was 460 mg /(m2·h) at 18:00. The rates of CO2 evolution were related with soil temperature. On the basis of the constructed regression equation and the monthly average values of temperature, the magnitude of CO2 evolution from Korean pine forest soil was 10.4 t /hm2 during a growing season.
基金supported by the 863 Program Grant of the Ministry of Science and Technology of China(Grant No.2012AA050103)the High-level Talents Scientific Research Start-up Fund Project of Yulin University(Grant No.2023GK13)+5 种基金the Key Industry Innovation Chain Group Project of Shaanxi Province(Grant No.2023-ZDLSF-64)the“New Star of Science and Technology”Talent Program of Yulin(Grant No.CXY-2022-137)the Natural Science Research Project of the Education Department in Shaanxi Province of China(Grant No.22JK0636)the Natural Science Basic Research Program of Shaanxi Province(Grant No.2021JCW-04)Young Talent Fund of Association for Science and Technology in Yulinthe Natural Science Sesearch Program of the Yulin High-tech Zone Science and Technology Bureau。
文摘CO_(2)capture and storage(CCS)has the risk of CO_(2)leakage,and this leakage always increases soil CO_(2)concentration,and the long-term CO_(2)stress damages crop production in farmland.Using maize,the growth characteristics,such as plant height and yield,and physiological indexes(osmoregulation substances and antioxidant enzymes)were explored under different simulative CO_(2)leakage conditions.Further,the relationship between maize physiological indexes and soil CO_(2)concentration was analyzed,showing that soil CO_(2)stress inhibited maize growth to a certain extent,resulting in shorter plants,thinner stems and lower kernel yield.With an increase in soil CO_(2)concentration,the contents of malondialdehyde,soluble sugar and soluble protein in maize leaves increased;with continuing stress,the increase rate of malondialdehyde was greatly augmented,whereas the increase rates of soluble sugar and soluble protein decreased.With extended CO_(2)stress,the activity of the enzyme superoxide dismutase(SOD)increased continuously,while the activities of catalase and peroxidase first increased and then decreased.Superoxide dismutase activity was closely correlated with soil CO_(2)concentration(r=0.762),and responded quickly to the change of soil CO_(2)concentration(R~2=0.9951).Therefore,SOD plays an important role in maize resistance to soil CO_(2)stress.This study will help further understanding of the mechanism of maize tolerance to soil CO_(2)stress,providing a theoretical basis for agricultural production in CCS project areas.
文摘精确预测大气 CO2 的未来变化对于预测全球气候变化是至关重要的。为此 ,需要确定大气 CO2 的源和汇及其随时间的变化。本文作者利用已发表和未发表的资料对一些实例进行了分析 :首先讨论了碳酸盐岩岩溶作用 (包括碳酸盐溶解及再沉积的共同影响 )对土壤 CO2和径流变化的敏感性 ;接着利用水化学 -流量方法和碳酸盐岩石片试验方法得出了我国和世界碳酸盐岩地区因碳酸盐岩岩溶作用从大气中吸收的净 CO2 总量 ,即碳酸盐岩岩溶作用对大气 CO2 沉降的贡献。它们分别是 :中国每年 180 0万 t C,整个世界岩溶地区 1.1亿 t C;最后 ,文章据 DBL理论模型计算得出世界碳酸盐岩地区碳酸盐岩溶解吸收CO2 一项产生的大气 CO2 沉降量为每年 4 .1亿 t C,继而得出全世界碳酸盐岩地区因碳酸盐再沉积而释放 CO2 产生的大气 CO2 源项为每年 3亿 t C。
