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利用13C同位素示踪方法测定O3对水稻C固定和迁移的影响

陈展1,2,王效科2**,尚鹤1   

  1. 1中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境重点实验室, 北京 100091; 2中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085)
  • 出版日期:2014-07-10 发布日期:2014-07-10

Using 13C isotope to investigate O3 effects on C fixation and translocation of rice.

CHEN Zhan1,2, WANG Xiao-ke2**, SHANG He1   

  1. (1Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; 2State Key Laboratory of Urban and Regional Ecology, Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)
  • Online:2014-07-10 Published:2014-07-10

摘要:

本研究设置2个臭氧浓度处理,即空气对照(CK,臭氧浓度约4~10 nL·L-1),臭氧浓度升高处理(O3,8 h平均浓度为110 nL·L-1),利用13C同位素示踪的方法,模拟研究了臭氧浓度升高对水稻碳固定和迁移的影响。结果表明:臭氧浓度升高后减少了植株对13C的固定,两次标记时臭氧处理下植株总的13C固定分别比对照处理低37.8%和20.0%;臭氧浓度升高处理1个月和2个月后叶片的13C分配相对于对照而言分别提高了47.3%和37.5%;而臭氧处理则降低了茎和根中的碳分配;臭氧浓度升高后叶的库强有明显的提高,而根的库强则明显降低,茎的库强虽有所降低但不明显;臭氧处理1个月和2个月后植株叶片的相对吸收能力分别比对照显著提高了48.5%和93.3%,臭氧处理下根的相对吸收能力则显著降低。
 
 

关键词: 海拔, 坡向, 坡度, 叶面积指数, 生境类型, 曲率

Abstract: The effects of elevated ozone on C fixation and translocation of rice were studied by using 13C isotope techniques. Two ozone treatments were performed: control (CK, with a daily average of 4-10 nL·L-1) and elevated ozone (O3, with an 8 h mean of 110 nL·L-1). Compared to the control treatment, the elevated ozone concentration reduced 13C fixation by 37.8% and 20.0%, increased the sink strength of leaf by 47.3% and 37.5% after one and two months exposure respectively, while reduced the sink strength of stem and root. Ozone exposure induced a significant increase in sink intensity in leaves, and an obvious decrease in root but not a significant effect on stem. The relative specific uptake of leaves was significantly increased by 48.5% and 93.3% after one month and two months of ozone exposure, respectively, and that of root decreased significantly.

Key words: slope degree, habitat type, slope aspect, leaf area index, altitude, curvature