Water loss in growth media with continuous drought

ZHANG Xiao－qing; ZHANG Jin－chi; WANG Li; MENG Li; HUANG Jing

doi:10.11833/j.issn.2095-0756.2010.06.006

Volume 27 Issue 6

Dec. 2010

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ZHANG Xiao－qing, ZHANG Jin－chi, WANG Li, MENG Li, HUANG Jing. Water loss in growth media with continuous drought[J]. Journal of Zhejiang A&F University, 2010, 27(6): 839-844. doi: 10.11833/j.issn.2095-0756.2010.06.006

Citation:

ZHANG Xiao－qing, ZHANG Jin－chi, WANG Li, MENG Li, HUANG Jing. Water loss in growth media with continuous drought[J]. Journal of Zhejiang A&F University, 2010, 27(6): 839-844. doi: 10.11833/j.issn.2095-0756.2010.06.006

Water loss in growth media with continuous drought

doi: 10.11833/j.issn.2095-0756.2010.06.006

1.
College of Forest Resources and Environment，Nanjing Forestry University，Nanjing 210037，Jiangsu，China

More Information

Corresponding author: ZHANG Jin－chi
Publish Date: 2010-12-20

Abstract

With spray sowing，water loss in the growth medium directly affects seed germination and seedling growth. Using time－domain reflectometry（TDR），the volumetric water content（VWC） of the growth medium which composed of the same materials in a greenhouse pot culture was measured. Four plant species were cultured with three repeats for each species. Regression equations were established for the progress of water loss to show the regulation and key drought time points of the water loss in growth medium. After seeding with Trifolium repens and Cosmos bipinnatus（44 d），Amorpha fruticosa（45 d），and Lolium perenne（43 d），evaporation was near 0 with 90% of the seedlings having withered. Water content in the growth medium decreased the most between 12 : 00 － 13 : 00 followed by a strong decrease from 13 : 00 － 15 : 00. Also，water condensation was minimal at night. Regression equations composed of temperature，humidity，time，and VWC showed highly significant correlation（R2＞0.92）.Water content in the 0 － 5 cm layer was always lower than the 5 － 10 and 10 － 15 cm layers. In addition，the rate of water loss in layer 10 － 15 cm was slow in earlier and later stages，but fast in the middle stage. After about 19 d，water content of the three layers was about the same.［Ch，4 fig. 2 tab. 19 ref.］
- soil science,
- growth medium,
- water loss,
- volumetric water content

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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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Water loss in growth media with continuous drought

1. College of Forest Resources and Environment，Nanjing Forestry University，Nanjing 210037，Jiangsu，China

Corresponding author: ZHANG Jin－chi

Publish Date: 2010-12-20

Key words:

Abstract: With spray sowing，water loss in the growth medium directly affects seed germination and seedling growth. Using time－domain reflectometry（TDR），the volumetric water content（VWC） of the growth medium which composed of the same materials in a greenhouse pot culture was measured. Four plant species were cultured with three repeats for each species. Regression equations were established for the progress of water loss to show the regulation and key drought time points of the water loss in growth medium. After seeding with Trifolium repens and Cosmos bipinnatus（44 d），Amorpha fruticosa（45 d），and Lolium perenne（43 d），evaporation was near 0 with 90% of the seedlings having withered. Water content in the growth medium decreased the most between 12 : 00 － 13 : 00 followed by a strong decrease from 13 : 00 － 15 : 00. Also，water condensation was minimal at night. Regression equations composed of temperature，humidity，time，and VWC showed highly significant correlation（R2＞0.92）.Water content in the 0 － 5 cm layer was always lower than the 5 － 10 and 10 － 15 cm layers. In addition，the rate of water loss in layer 10 － 15 cm was slow in earlier and later stages，but fast in the middle stage. After about 19 d，water content of the three layers was about the same.［Ch，4 fig. 2 tab. 19 ref.］

Water loss in growth media with continuous drought

doi: 10.11833/j.issn.2095-0756.2010.06.006

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Related

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