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生态学杂志 ›› 2009, Vol. 28 ›› Issue (11): 2227-2232.

• 研究报告 • 上一篇    下一篇

荷木树干CO2释放通量与木质部液流和CO2浓度的关系

朱丽薇1,2;赵平1**;蔡锡安1;曾小平1;邹绿柳1,2   

  1. 1中国科学院华南植物园,广州 510650;2中国科学院研究生院,北京 100039
  • 出版日期:2009-11-10 发布日期:2009-11-10

Schima superba stem CO2 efflux and its relations to xylem sap flux density and xylem CO2 concentration.

ZHU Li-wei1,2;ZHAO Ping1;CAI Xi-an1;ZENG Xiao-ping1;ZOU Lu-liu1,2   

  1. 1South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;2Graduate University of Chinese Academy of Sciences, Beijing 100039, China
  • Online:2009-11-10 Published:2009-11-10

摘要: 采用红外气体分析仪,于20081017—19日连续3个昼夜原位监测了荷木的树干CO2释放通量、树干温度、木质部液流密度和CO2浓度。结果表明:树干CO2释放通量(EA)日变化呈S形曲线,不同径级间差异显著。EA与树干温度呈显著幂函数关系(0.24<R2<0.78),晚上的温度系数(b)、回归系数(R2)高于白天,Q10值在2.012.79EA与木质部CO2浓度显著相关,三次曲线拟合度最好,R2达到0.48。在排除树干温度影响的条件下,EA与液流密度显著负相关(r = -0.462)。仅用温度估算树干CO2释放通量必然产生误差,应考虑液流对树干CO2释放通量的影响。

关键词: 蚯蚓粪, 系统诱导抗性, 多酚氧化酶, 过氧化物酶, 苯丙氨酸解氨酶, 黄瓜炭疽病

Abstract: By using a Li 820 infra red CO2 gas analyzer, an in situ measurement of  Schima superba stem CO2 efflux was conducted for three consecutive days from 17 to 19 October 2008. In the meantime, the stem temperature, xylem sap efflux density, and xylem CO2 concentration were measured. The stem CO2 efflux had a diurnal variation of “S” pattern, and differed significantly with stem diameter. There was a significant exponential relationship between stem CO2 efflux and stem temperature (0.24<R2<0.78). The temperature coefficient (b) and regression coefficient (R2) were higher at nighttime than at daytime, and the Q10 value ranged from 2.01 to 2.79. The stem CO2 efflux correlated significantly with the xylem CO2 concentration, and the best regression curve was cubic (R2=0.48). Excluding the effects of stem temperature, the stem CO2 efflux showed a significant negative correlation with xylem sap flux density (r = -0.462). Therefore, only using simple temperature function to estimate stem CO2 efflux would yield a significant error, and xylem sap flux should be taken into consideration in the stem CO2 efflux estimation.

Key words: Earthworm feces, Systemic induction resistance, Polyphenol oxidase, Peroxidase, Phenylalanine ammonia-lyase, Anthracnose