Study on vulnerability of xylem embolism in twigs of seven tree species

XIE Dong-feng; MA Lǜ-yi; WANG Hua-tian

Volume 21 Issue 2

Feb. 2017

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XIE Dong-feng, MA Lǜ-yi, WANG Hua-tian. Study on vulnerability of xylem embolism in twigs of seven tree species[J]. Journal of Zhejiang A&F University, 2004, 21(2): 138-143.

Citation:

XIE Dong-feng, MA Lǜ-yi, WANG Hua-tian. Study on vulnerability of xylem embolism in twigs of seven tree species[J]. Journal of Zhejiang A&F University, 2004, 21(2): 138-143.

Study on vulnerability of xylem embolism in twigs of seven tree species

XIE Dong-feng^{1
,
,},
MA Lǜ-yi²,
WANG Hua-tian^{1
,
,}

1.
.Forestry College , Shandong Agricultural University , Tai,an 271018, Shandong , China;
2.
School of Resources and Environment, Beijing Forestry University , Beijing 100083, China

Funds:

国家自然科学基金资助项目(30371147, 2003);山东农业大学博士基金资助项目

Received Date: 2004-02-08
Rev Recd Date: 2004-03-15
Publish Date: 2004-04-20

Abstract

The xylem embolism and moisture potential of one-year-old twigs of 7 tree species including Robina pseudoacacia ,Pyrus betulaefolia , Quercus acutissima , Melia azedarach , Ginkgo biloba , Pistacia chinensis and Acer mono in the north of China were studied with the `flushing method' in autumn .Embolism vulnerability curves of all 7 species were drawn .The results were as follows :(1)Maximum twig water conductivity of 7 tree species were 0.054 3 , 0.036 2 , 0.022 0 , 0.018 4 , 0.014 1 , 0.013 3 and 0.011 0 gcm-2s-1 ;(2)Branch moisture potential had a magnificent affect on xylem embolism .With the decrease in moisture potential , the xylem embolism became serious ; (3) Taking 50 % hydraulic conductance loss as the critical value of the embolism vnlnerability , we found out thatM .azedarach and P .chinensis were of the most embolism vulnerabiliy ;and R . pseudoacacia and Q .acutissima came in second ;the other three species were of least embolism vulnerability ; (4)When the twig moisture potentials descend to -4.5 , -3.8 , -4.2 , -3.6 , -4.7 , -4.5 and -4.3 MPa respectively , the maximum hydraulic conductivities of Q .acutissima , R .pseudoacacia and M .azedarach were about 94 %～ 96 %, G.bi loba and P .betulaefolia about 99 %, and P .chinensis only 78 %;(5)The embolism vulnerability curves of most species under test were in reciprocal forms ;those of R .pseudoacacia and M .azedarach were in index forms.They all had significantly fitting formulas .[ Ch , 2 fig .1 tab .20 ref .]
- tree physiology,
- xylem,
- xylem embolism vulnerability,
- vulnerability curve,
- hydraulic conductivity loss,
- moisture potential

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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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Study on vulnerability of xylem embolism in twigs of seven tree species

1. .Forestry College , Shandong Agricultural University , Tai,an 271018, Shandong , China;

2. School of Resources and Environment, Beijing Forestry University , Beijing 100083, China

Funds:

国家自然科学基金资助项目(30371147, 2003);山东农业大学博士基金资助项目

Received Date: 2004-02-08

Rev Recd Date: 2004-03-15

Publish Date: 2004-04-20

Key words:

Abstract: The xylem embolism and moisture potential of one-year-old twigs of 7 tree species including Robina pseudoacacia ,Pyrus betulaefolia , Quercus acutissima , Melia azedarach , Ginkgo biloba , Pistacia chinensis and Acer mono in the north of China were studied with the `flushing method' in autumn .Embolism vulnerability curves of all 7 species were drawn .The results were as follows :(1)Maximum twig water conductivity of 7 tree species were 0.054 3 , 0.036 2 , 0.022 0 , 0.018 4 , 0.014 1 , 0.013 3 and 0.011 0 gcm-2s-1 ;(2)Branch moisture potential had a magnificent affect on xylem embolism .With the decrease in moisture potential , the xylem embolism became serious ; (3) Taking 50 % hydraulic conductance loss as the critical value of the embolism vnlnerability , we found out thatM .azedarach and P .chinensis were of the most embolism vulnerabiliy ;and R . pseudoacacia and Q .acutissima came in second ;the other three species were of least embolism vulnerability ; (4)When the twig moisture potentials descend to -4.5 , -3.8 , -4.2 , -3.6 , -4.7 , -4.5 and -4.3 MPa respectively , the maximum hydraulic conductivities of Q .acutissima , R .pseudoacacia and M .azedarach were about 94 %～ 96 %, G.bi loba and P .betulaefolia about 99 %, and P .chinensis only 78 %;(5)The embolism vulnerability curves of most species under test were in reciprocal forms ;those of R .pseudoacacia and M .azedarach were in index forms.They all had significantly fitting formulas .[ Ch , 2 fig .1 tab .20 ref .]

Study on vulnerability of xylem embolism in twigs of seven tree species

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通讯作者: 陈斌, bchen63@163.com

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