Photosynthetic differences between understory clonal rametsof Rhus typhina and Vitex negundo var. heterophyllain Taihang Mountain area of China

ZHANG Ming-ru; YUYi-wu; ZHAI Ming-pu; YAO Jun; WANG Xue-yong

Volume 24 Issue 1

Feb. 2017

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ZHANG Ming-ru, YUYi-wu, ZHAI Ming-pu, YAO Jun, WANG Xue-yong. Photosynthetic differences between understory clonal rametsof Rhus typhina and Vitex negundo var. heterophyllain Taihang Mountain area of China[J]. Journal of Zhejiang A&F University, 2007, 24(1): 1-6.

Citation:

ZHANG Ming-ru, YUYi-wu, ZHAI Ming-pu, YAO Jun, WANG Xue-yong. Photosynthetic differences between understory clonal rametsof Rhus typhina and Vitex negundo var. heterophyllain Taihang Mountain area of China[J]. Journal of Zhejiang A&F University, 2007, 24(1): 1-6.

Photosynthetic differences between understory clonal rametsof Rhus typhina and Vitex negundo var. heterophyllain Taihang Mountain area of China

1.
School of Tourism and Health, Zhejiang Forestry College, Lin'an 311300, Zhejiang, China;
2.
KeyLaboratory for Silviculture of the Ministry of Education, Beijing Forestry University, Beijing 100083, China;
3.
Rear Service CenterofGeneral Office, PeoplesGovernmentof InnerMongolia Autonomous Region, Huhhot010096,InnerMongolia, China;
4.
Hebei Academy of Forestry, Shijiazhuang 050061, Hebei, China

Funds:

国家教育部博士专项基金资助项目(20040022021);十五国家科学技术攻关项目(2001BA510B0405)

Received Date: 2006-05-18
Rev Recd Date: 2006-09-18
Publish Date: 2007-02-20

Abstract

In the degraded habitat of the hilly Taihang Mountain area, non-native tree species of Staghorn sumac(Rhus typhina) have spread over time forming a number of monodominant communities. In order to understanddifferences in their ecological adaptation, the physio-ecological diurnal variations from clonal ramets of R. typhinaand and Vitex negundo var. heterophylla(negundo chastetree), growing in different light regimes as an understory of astaghorn sumac monodominantoverstory andwith no overstory, were studied. Based on a field experiment staghornsumac ramets growing under the staghorn sumac overstory more effectively captured low levels of photosyntheticallyactive radiation(PAR) than V. negundo var. heterophylla. So the net photosynthetic rate(Pn) of clonalramets of V. negundo var. heterophylla was significantly lowerthan R. typhina(P 0.05). Additionally, Pnof V. negundo var. heterophylla growing at the edge of the staghorn sumac monodominant community reached apeak of about 9.183molm- 2s- 1at 10: 00, while the same species growing beneath the overstory only attained1.396molm- 2s- 1. When grown under the overstory, the ratio of variable tomaximum chlorophyll fluorescenceemission(Fv/ Fm) from 13: 00- 17: 00 was stately higher(P 0.05) for R. typhina clonal ramets than V.negundo var. heterophylla, meaning that clonal ramets of R. typhina were better adapted to weak light. Thus,shading from an R. typhina overstory caused photosynthetic physio-ecological differences between clonal ramets of R. typhina and V. negundo var. heterophylla.[Ch, 4 fig. 1 tab. 33 ref.]
- botany,
- photosynthetically active radiation( PAR),
- Rhus typhina,
- Vitex negundo var.heterophylla,
- monodominant community,
- clonal ramet

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Photosynthetic differences between understory clonal rametsof Rhus typhina and Vitex negundo var. heterophyllain Taihang Mountain area of China

1. School of Tourism and Health, Zhejiang Forestry College, Lin'an 311300, Zhejiang, China;

2. KeyLaboratory for Silviculture of the Ministry of Education, Beijing Forestry University, Beijing 100083, China;

3. Rear Service CenterofGeneral Office, PeoplesGovernmentof InnerMongolia Autonomous Region, Huhhot010096,InnerMongolia, China;

4. Hebei Academy of Forestry, Shijiazhuang 050061, Hebei, China

Funds:

国家教育部博士专项基金资助项目(20040022021);十五国家科学技术攻关项目(2001BA510B0405)

Received Date: 2006-05-18

Rev Recd Date: 2006-09-18

Publish Date: 2007-02-20

Key words:

botany /
photosynthetically active radiation( PAR) /
Rhus typhina /
Vitex negundo var.heterophylla /
monodominant community /
clonal ramet

Abstract: In the degraded habitat of the hilly Taihang Mountain area, non-native tree species of Staghorn sumac(Rhus typhina) have spread over time forming a number of monodominant communities. In order to understanddifferences in their ecological adaptation, the physio-ecological diurnal variations from clonal ramets of R. typhinaand and Vitex negundo var. heterophylla(negundo chastetree), growing in different light regimes as an understory of astaghorn sumac monodominantoverstory andwith no overstory, were studied. Based on a field experiment staghornsumac ramets growing under the staghorn sumac overstory more effectively captured low levels of photosyntheticallyactive radiation(PAR) than V. negundo var. heterophylla. So the net photosynthetic rate(Pn) of clonalramets of V. negundo var. heterophylla was significantly lowerthan R. typhina(P 0.05). Additionally, Pnof V. negundo var. heterophylla growing at the edge of the staghorn sumac monodominant community reached apeak of about 9.183molm- 2s- 1at 10: 00, while the same species growing beneath the overstory only attained1.396molm- 2s- 1. When grown under the overstory, the ratio of variable tomaximum chlorophyll fluorescenceemission(Fv/ Fm) from 13: 00- 17: 00 was stately higher(P 0.05) for R. typhina clonal ramets than V.negundo var. heterophylla, meaning that clonal ramets of R. typhina were better adapted to weak light. Thus,shading from an R. typhina overstory caused photosynthetic physio-ecological differences between clonal ramets of R. typhina and V. negundo var. heterophylla.[Ch, 4 fig. 1 tab. 33 ref.]

Photosynthetic differences between understory clonal rametsof Rhus typhina and Vitex negundo var. heterophyllain Taihang Mountain area of China

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

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