Growth Responses of Reaumuria soongorica to Elevated CO2 Concentration and Precipitation Changing

doi:10.11733/j.issn.1007-0435.2017.05.021

Acta Agrestia Sinica ›› 2017, Vol. 25 ›› Issue (5): 1061-1068.DOI: 10.11733/j.issn.1007-0435.2017.05.021

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Growth Responses of Reaumuria soongorica to Elevated CO₂ Concentration and Precipitation Changing

CHONG Pei-fang, LIU Sheng-tong, LI Yi, SU Shi-ping, SHAN Li-shan

College of Forestry, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China

Received:2017-03-27 Revised:2017-09-13 Online:2017-10-15 Published:2018-01-25

红砂对大气CO₂浓度升高及降水变化的生长响应

种培芳, 刘晟彤, 李毅, 苏世平, 单立山

甘肃农业大学林学院, 甘肃兰州 730070

作者简介:种培芳(1977-),女,甘肃永登人,博士,教授,主要从事荒漠植物的生理生态研究,E-mail:zhongpf@gsau.edu.cn
基金资助:
国家自然基金（41461044，31360205，41361100）；甘肃省自然基金（1606RJZA023）；甘肃省高等学校科研项目（2016A-029）资助

Abstract

Abstract:

Pot experiments were conducted to study the co-effects of elevated CO₂ concentration and changing precipitation on growth characters of Reaumuria soongorica, a dominant of desert steppe in the arid region of China, in order to assess the possible effect of global climate change on desert ecosystem. The main plot contained three CO₂ concentrations (350,500 and 700 μmol·mol^-1) and five precipitation levels[natural precipitation as control (0), precipitation minus 30% (-30%), precipitation minus 15% (-15%), precipitation plus 15% (+15%), precipitation plus 30% (+30%)]. The results showed that in June, July and August, elevated CO₂ promoted the increase of plant height, aboveground biomass, root biomass and total biomass of R.soongorica under five precipitation conditions, and CO₂ fattening effect on the growth in increased precipitation was bigger than that of in decreased precipitation. In June and July, root mass fraction and root/shoot ratio were decreased with elevated CO₂ concentration under five precipitation conditions, and only in August, root mass fraction and root/shoot ratio of R.soongorica were enhanced by elevated CO₂ under -15% precipitation. In conclusion, elevated CO₂ concentration would promote R.soongorica to accumulate more aboveground biomass to abtain more resources when precipitation is increased in the future; elevated CO₂ concentration would stimulate this plant distribute more belowground biomass to adapt drought environment when precipitation is decreased in the future, but the effect was limited by the amount of precipitation and processing time.

Key words: Elevated CO₂ concentration, Precipitation, Biomass accumulation and allocation, Growth strategy, Reaumuria soongorica

摘要：

以荒漠植物红砂（Reamuria soongorica）为试材，采用开顶式CO₂控制气室模拟CO₂浓度变化（350，550和700 μmol·mol^-1），研究了降水变化（-30%，-15%，0，+15%，+30%）及其与CO₂的协同作用对红砂生长特性的影响。结果表明：在6、7、8月份，CO₂浓度增加对5种降水下红砂的株高、地上生物量、根生物量和总生物量均有增肥效应，且降水增加时的增肥效应大于降水减少时的。6、7月份，红砂的根质量分数和根冠比在5种降水下均随CO₂浓度的升高而降低；而在8月份仅降水为-15%时，CO₂浓度增加可促进红砂的根质量分数和根冠比。综上所述，未来降水增多时，CO₂浓度升高可促进红砂地上生物量积累来获取更多资源；降水减少，CO₂浓度增加可促进地下生物量的分配来适应干旱环境，但这种调节作用与降水的多少及处理时间长短有关。

关键词: CO2浓度升高, 降水, 生物量分配, 生长策略, 红砂

CLC Number:

Q948.112

CHONG Pei-fang, LIU Sheng-tong, LI Yi, SU Shi-ping, SHAN Li-shan. Growth Responses of Reaumuria soongorica to Elevated CO₂ Concentration and Precipitation Changing[J]. Acta Agrestia Sinica, 2017, 25(5): 1061-1068.

种培芳, 刘晟彤, 李毅, 苏世平, 单立山. 红砂对大气CO₂浓度升高及降水变化的生长响应[J]. 草地学报, 2017, 25(5): 1061-1068.

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Growth Responses of Reaumuria soongorica to Elevated CO₂ Concentration and Precipitation Changing

红砂对大气CO₂浓度升高及降水变化的生长响应

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