Photosynthetic Characteristics of Potentilla Discolor Bunge and Their Response to Light Intensity in Loess Hilly Area

BU Xiu-qin; XU Xue-xuan; DU Feng; HE Ping

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Photosynthetic Characteristics of Potentilla Discolor Bunge and Their Response to Light Intensity in Loess Hilly Area

- Photosynthetic Characteristics of Potentilla Discolor Bunge and Their Response to Light Intensity in Loess Hilly Area
- Bulletin of Soiland Water Conservation Vol. 26, Issue 6, Pages: 85-89(2007)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所
  2. 安塞县农业经济管理站, 陕西, 杨凌,712100
  3. ,陕西,西安,710048
  4. 广西环境保护科学研究院
  5. .,广西,南宁,530022
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2007
- 稿件说明：
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BU Xiu-qin, XU Xue-xuan, DU Feng, et al. Photosynthetic Characteristics of Potentilla Discolor Bunge and Their Response to Light Intensity in Loess Hilly Area[J]. Bulletin of Soiland Water Conservation, 2007, 26(6): 85-89.
DOI：

BU Xiu-qin, XU Xue-xuan, DU Feng, et al. Photosynthetic Characteristics of Potentilla Discolor Bunge and Their Response to Light Intensity in Loess Hilly Area[J]. Bulletin of Soiland Water Conservation, 2007, 26(6): 85-89. DOI：

摘要

运用开放式气体交换LI-6400便携式光合作用测定系统

测定了自然条件下黄土丘陵区翻白草(Potentilla discolor Bunge)的光合速率(P

)、蒸腾速率(T

)、气孔导度(C

)及其光响应曲线。(1)翻白草净P

日进程呈"单谷"型曲线

在早晨8:00

为全天最大值14.91μmol/(m

·s);至14:00

降到最小值0.13μmol/(m

·s)

植物进入"午休"状态。(2)翻白草的光补偿点为51.4μmol/(m

·s)

光饱和点为527μmol/(m

·s)

表观量子效率为0.056 6

说明翻白草属于典型的阳生植物。(3)在光响应过程中

随着有效光辐射强度(R

)的增强

翻白草的蒸腾速率(T

)-直处于上升趋势

与G

变化趋势完全-致

二者呈指数关系。翻白草WUE随R

的增强呈抛物线状变化

在初始阶段

WUE增加较快

为800μmol/(m

·s)时

WUE达到最大值4.68 mmol/mol之后

WUE开始逐渐降低

但是变化较小。

Abstract

Photosynthetic rate(P.)

transpiration rate(T.)

stoma conductance(G.)

and light response curve of Potentilla d iscolor Bunge were measured in the field using an open gas exchange system

Li-6400 Porta ble Photosynthesis System in the hilly area of the Loess Pla tea u.Results showed that the diurnal va ria- tion of net photosynthetic rate presented a single-bottom curve.The maximal P.was 14.91 μmol/(m2?s) at 8:00 a.m and the minimum P0.13 μmol /(m2?s) at 14:00 p.m.Potentilla d iscolor Bunge got into the state of photosynthetic noon break. The light compensation point

the light saturation point

and apparent quant um efficiency of Potentilla discolor Bunge were 51.4

527

and 0.0566 μmol/(m2? s)

respectively.This indicated that Potentilla d iscolor Bunge was a typical sun plant.During the course of light response

with RPA increasing

rose and its diurnal variation was in agreement with G

.There was an exponent rela tionship between T

and G

The water use efficiency(WUE) of Potentilla d iscolor Bunge abided wit h a parabola model as RPA increased.At the beginning

WUE increased greatly and the maxim um appeared at 4.68 mmol/mol when RPA was 800 μmol/(m2 ? s).Then WUE decreased with a less variation.

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