论文总字数：21130字

目 录

摘要 I

abstract II

0引言 1

1材料和方法 2

1.1实验地概况 2

1.2实验材料 2

1.3实验安排 2

1.4测定方法 3

1.5计算过程 3

1.6统计分析 4

2结果与分析 4

2.1不同CO₂浓度升高水平对水稻光合特征的影响 4

2.1.1对光合响应曲线的影响 4

2.1.2对CO₂响应曲线的影响 6

2.2相同CO₂浓度不同处理下净光合速率的比较 9

2.2.1 2016年水稻生长季 9

2.3不同CO₂浓度升高水平对水稻生物量的影响 10

2.3.1 2016年水稻生长季 10

2.3.2 2017年水稻生长季 11

3讨论 13

3.1不同CO₂浓度水平对水稻光合速率的影响 13

3.2不同CO₂浓度水平对水稻生物量的影响 13

4结论 14

参考文献 15

致 谢 17

不同CO₂浓度升高水平对粳稻光合特征和生物量的影响

汪芋君

,China

Abstract: Due to the impact of human activities, the continuous rise of atmospheric carbon dioxide concentration has become one of the most prominent changes in climate change. Rice is an important food source for humans, and climate change will have a huge impact on the growth and yield of rice. This paper adopt the open top chamber (OTC) regulate carbon dioxide concentration, compared to background atmospheric CO₂ concentration（CK）, set up in 2016 rice under the background of atmospheric CO₂ concentration increased 200 PPM (CK 200, the same below) and add 40 PPM (CK 40) two processing. In 2017, the CO₂ concentration of rice will be increased by 80 PPM (CK 80) and 200ppm in the background atmosphere. The photosynthetic and dry matter accumulation in different growth stages of rice were measured, and the effects of different levels of CO₂ concentration on photosynthetic characteristics and biomass of japonica rice were studied. The results showed that there was no significant difference in the apparent quantum efficiency, light compensation point and respiration rate of CK 200 and CK 40 in the rice elongation stage, heading stage and milk period. The maximum net photosynthetic rate of CK 40 was not significantly different from CK in the elongation stage and heading stage of rice, and CK 200 treatment was significantly increased compared with CK and CK 40.The maximum net photosynthetic rate of japonica rice was not significantly different from CK compared with CK in the curing period,CK 200 and CK 40.Compared with CK, the carboxylation efficiency of rice was significantly reduced and CO₂ compensation point increased significantly during the three reproductive years. In rice three reproductive period, CK 80 processing compared with CK, in addition to the leaf, rice stem sheath weight, spike weight, root weight and the ground biomass, total biomass has significant improvement in the heading stage of rice and ratooning buds, CK 200 under the treatment of leaf weight, leaf sheaths, spike weight, root weight, the ground biomass, total biomass no significant difference compared with CK group.

Key words: carbon dioxide concentration；japonica rice；photosynthetic characteristics；biomass；growth period

0引言

由于人类活动的影响，温室气体浓度升高已经成为气候变化最为突出的现象之一。目前，大气CO₂含量已经从工业革命前的280μmol·mol^-1增至当前的395μmol/mol,平均增速达1—2ppm/yr，预计到20世纪大气CO₂含量最高可达到目前的二倍^[1]，这将会对作物的生长状况和产量形成产生巨大的影响。

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