蒙古沙冬青光合作用特征及其影响因素

生态学杂志

蒙古沙冬青光合作用特征及其影响因素

李征珍¹,杨琼²,石莎¹,冯金朝^1*#br#

（¹ 中央民族大学生命与环境科学学院，北京 100081； ^2 云南大学生态学与环境学院，云南 650091）

出版日期:2017-09-10 发布日期:2017-09-10

The photosynthetic characteristics of Ammopiptanthus mongolicus and its affecting factors.

LI Zheng-zhen¹, YANG Qiong², SHI Sha¹, FENG Jin-chao^1*#br#

(¹College of Life and Environmental Science, Munzu University of China, Beijing 100081, China; ²School of Ecology and Environmental Science, Yunnan University, Yunnan 650091, China).

Online:2017-09-10 Published:2017-09-10

摘要/Abstract

摘要： 通过测定不同季节蒙古沙冬青的气体交换参数，探讨其光合作用的日变化和季节变化特征，旨在为蒙古沙冬青天然种群的保护和恢复工作提供理论依据和参考。结果表明：蒙古沙冬青光合作用具有显著的季节变化特征，总体呈春夏高、秋冬低的趋势；3—9月期间，蒙古沙冬青净光合速率（P_n）在10:00—13:00时均显著下降，但其机制具有季节差异；多元线性回归结果表明，影响蒙古沙冬青P_n的主要生理因子是气孔导度、胞间CO₂浓度和气孔限制值，主要环境因子是空气湿度、大气CO₂浓度和光照强度。本研究认为，蒙古沙冬青生长关键季节是春夏两季，干旱引起的气孔关闭是其光合作用的主要限制因子；建议利用春夏两季进行蒙古沙冬青种群的恢复和重建工作，重点关注其旱季和冬季的保护工作。

关键词: 氮素水平, 荒漠草原, 水分处理, 凋落物分解

Abstract: In order to provide theoretical reference for the protection and recovery of Ammopiptanthus mongolicus population, the diurnal and seasonal variation patterns of the photosynthetic characteristics in A. mongolicus were investigated by measuring the foliar gas exchange in the field.The results showed that the photosynthesis of A. mongolicus showed significant seasonal variations. In general, the photosynthesis was higher during spring and summer compared with that in fall and winter. The net photosynthetic rate (P_n) in A. mongolicus decreased during 10:00-13:00 from March to September, but its underlying mechanisms were seasonally specific. The results of multiple regression analysis showed that the major physiological factors affecting P_n in A. mongolicus were stomatal conductance, intercellular CO₂ concentration, and stomatal limitation to CO₂. Meanwhile, the environmental factors affecting P_n were air relative humidity, air CO₂ concentration and photosynthetic photon flux density. In conclusion, A. mongolicus grew rapidly during spring and summer, and the main limiting factor of its photosynthesis was the droughtinduced stomatal limitation. It was suggested that the restoration of A. mongolicus population should be conducted during spring and summer, and the protection of A. mongolicus population should be emphasized during drought season and winter.

Key words: nitrogen application level, litter decomposition, water treatment, desert grassland

李征珍1,杨琼2,石莎1,冯金朝1*. 蒙古沙冬青光合作用特征及其影响因素[J]. 生态学杂志.

LI Zheng-zhen1, YANG Qiong2, SHI Sha1, FENG Jin-chao1*. The photosynthetic characteristics of Ammopiptanthus mongolicus and its affecting factors.[J]. cje.

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