CO2浓度与温度增高对玉米种子活力的影响

论文总字数：21494字

目 录

摘要·······················································1

ABSTRACT···················································2

1引言·····················································3

1.1大气CO₂浓度现状与发展趋势··············································3

1.2 作物对CO₂与温度的响应研究研究现状······································3

1.2.1 作物对CO₂的响应··················································3

1.2.2 作物对温度的响应·················································3

1.3 我国玉米种植现状·······················································4

1.4 种子活力的概念·························································5

1.5本文研究目的与意义······················································5

2 材料与方法···············································6

2.1实验平台--开顶式气室（OTC）··············································6

2.2 试验材料，试剂与仪器设备················································6

2.3试验方法································································6

2.3.1 标准发芽试验·····················································6

2.3.2 电导率测定试验···················································7

2.4指标计算公式····························································7

2.5统计分析方法····························································7

3 结果与分析···············································8

3.1 电导率测定试验结果分析·················································8

3.1.1 24h吸胀速度·······················································8

3.1.2 浸种24h浸出液电导率分析··········································8

3.2 标准发芽试验测定结果分析··············································10

3.2.1 露白率··························································10

3.2.2 发芽势··························································10

3.2.3 发芽率··························································11

3.2.4发芽指数·························································12

3.2.5 活力指数························································12

3.3 根系与芽的影响························································13

4 讨论····················································13

5结论与展望···············································15

5.1 主要结论······························································15

5.2研究展望·······························································15

5.3创新点································································16

参考文献··················································16

致谢······················································18

CO₂浓度与温度增高对玉米种子活力的影响

刘昌明

，China

Abstract: Maize is the largest and most productive grain crop in China. Under the premise of increasing atmospheric CO₂ and global warming, it is of great significance to study the response of maize to this change.In this paper, OTC equipment was used as the experimental material, the control (Ambient, OTC untreated), the temperature increase (1.5℃ higher than Ambient) and the control system were used as the platform of the climate change positioning experiment center of the Helen Agricultural Ecological Experiment Station of the Chinese Academy of Sciences. CO₂ concentration and temperature increased simultaneously (CO₂ concentration higher than Ambient 300μmol • mol^-1, the temperature is higher than Ambient 1.5℃) three treatments, seed ripening harvested seeds for laboratory leaching solution conductivity test and standard germination test. The results showed that compared with the control group, the temperature and the increase of CO₂ significantly reduced the electrical conductivity of maize seed leaching solution, and significantly increased the bleaching rate, germination potential and germination rate. Similarly, the impact of the same direction, but the range is small, and did not reach a significant level. The detection of germination index, vigor index and root system showed that the effect of CO₂ and temperature on these parameters was complex and no obvious rule was found. In general, the atmospheric CO₂ concentration increased to 700μmol • mol^-1, and the temperature increase of 1.5℃ could promote germination of maize and the effect of this change on root system should be further studied.

Key words: Maize; carbon dioxide; air temperature; seed vigor

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