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林业科学 ›› 2007, Vol. 43 ›› Issue (09): 123-127.doi: 10.11707/j.1001-7488.20070922

• 研究简报 • 上一篇    下一篇

黄土丘陵区铁杆蒿光合特性*

步秀芹1,2 徐学选1 康博文1 郭劲松1   

  1. 1.中国科学院水土保持研究所 杨凌712100;2.广西环境保护科学研究院 南宁530022
  • 收稿日期:2006-09-08 修回日期:1900-01-01 出版日期:2007-09-25 发布日期:2007-09-25

Photosynthetic Characteristics of Artemisia sacrorum in the Loess Hilly Region

Bu Xiuqin1,2,Xu Xuexuan1,Kang Bowen1,Guo Jinsong1   

  1. 1.Institute of Soil and Water Conservation,Chinese Academy of Sciences Yangling 712100;2.Guangxi Research Institute of Environmental Protection Nanning 530022
  • Received:2006-09-08 Revised:1900-01-01 Online:2007-09-25 Published:2007-09-25

关键词: 铁杆蒿, 黄土丘陵区, 净光合速率, 水分利用效率, 光合-光响应

Abstract:

Photosynthesis and transpiration of Artemisia sacrorum were studied using the Li-6400 portable photosynthesis system in Loess Plateau region.The results showed that the diumal variation of net photosynthetic rate (Pn)in A.Sacrorum was single-peak curves from June to September.The diurnal variation of Pn was a bimodal curve and photosynthesis got into middaydepression at 14:00 in May.The light compensation point (LCP) and the light saturation point (LSP) of A.Sacrorum were 44.1 μmol·m-2s-1 and 351 μmol·m-2s-1.Respectively.The LCP was higher than that of typical sun plants and the LSPverged on that of typical sun plants.This indicated that A.Sacrorum was a sunny and typical sun plant.With PAR increasing,Tr was increasing along and had no saturation peak.When PAR was less than 160 μmol·m-2s-1,the water use efficiency (WUE) of A.Sacrorum increased greatly.When PAR variedfrom 160 to 2000μmol·m-2s-1WUE changed from 2.5 to 3.39μmol C02·mmol-1H2O.It was proved again that A.Sacrorum was a sunny plant.

Key words: Artemisia sacrorum, Loess hilly region, net photosynthetic rate, water use efficiency, photosynthesis-light response