Temporal variation for canopy transpiration and its cooling properties in a <em>Quercus acutissima</em> forest of suburban Nanjing

LIU Xin1; ZHANG Jinchi; XIE Dejin; ZHUANG Jiayao; SHAO Yongchang; ZHANG Shuifeng

doi:10.11833/j.issn.2095-0756.2015.04.006

Volume 32 Issue 4

Jul. 2015

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LIU Xin1, ZHANG Jinchi, XIE Dejin, ZHUANG Jiayao, SHAO Yongchang, ZHANG Shuifeng. Temporal variation for canopy transpiration and its cooling properties in a Quercus acutissima forest of suburban Nanjing[J]. Journal of Zhejiang A&F University, 2015, 32(4): 529-536. doi: 10.11833/j.issn.2095-0756.2015.04.006

Citation:

LIU Xin1, ZHANG Jinchi, XIE Dejin, ZHUANG Jiayao, SHAO Yongchang, ZHANG Shuifeng. Temporal variation for canopy transpiration and its cooling properties in a Quercus acutissima forest of suburban Nanjing[J]. Journal of Zhejiang A&F University, 2015, 32(4): 529-536. doi: 10.11833/j.issn.2095-0756.2015.04.006

Temporal variation for canopy transpiration and its cooling properties in a Quercus acutissima forest of suburban Nanjing

doi: 10.11833/j.issn.2095-0756.2015.04.006

1.
Jiangsu Key Laboratory of Soil and Water Conservation and Ecological Restoration, Nanjing Forestry University, Nanjing 210037, Jiangsu, China;
2.
Nanjing Forest Police College, Nanjing 210023, Jiangsu, China

Funds:

长三角水源区面源污染林业生态修复技术研究项目（201104055-1）;国家林业公益性行业重大专项（201104005）;江苏高校优势学科建设工程资助项目（PAPD）

Received Date: 2014-11-20
Rev Recd Date: 2014-12-24
Publish Date: 2015-08-20

Abstract

Global warming and regional water resources shortage have become the focus of the global. Climate warming affects global hydrological cycles, and tree transpiration also affects climate warming. This study was conducted to analyze canopy transpiration of Quercus acutissima and to determine its cooling effect on surrounding environments. Continuous observation of the sap flow density and environmental factors, such as solar radiation, air temperature, air relative humidity, soil temperature, soil water content, used a sap flow meter and a mini weather station in Nanjing Dongshanqiao Forest Farm. Maximum sap flux density, peak daily sap flux density, transpiration heat flux, solar energy, consumed-energy coefficient, and canopy transpiration cooling was conducted according these data. Six trees of different diameter grade were observed. Results indicated that 1） the maximum sap flux density appeared at 13:00; the greatest peak daily sap flux density was 18.78 gcm-2h-1 in August, and the lowest was 13.49 gcm-2h-1 in June. 2） Canopy transpiration summed from May to October was 237.52 mm with the highest month being July. 3） July also had the greatest transpiration heat flux （154.97 MJ m-2） and solar energy （489.65 MJm-2）. The coefficient of consumed-energy for canopy transpiration was highest in August （35.8%） and lowest in October （25.8%）. 4） Canopy transpiration cooling from Q. acutissima was highest in July （3.07 ℃）, and during the growing season, canopy transpiration reduced the average temperature （2.35 0.53）℃h-1 per 10 m3 air. According to the transpiration and its cooling effect, we could choose suitable afforestation design in order to alleviate global warming and heat island effect ［Ch, 6 fig. 1 tab. 28 ref.］
- forest hydrology,
- Quercus acutissima forest,
- canopy transpiration,
- cooling

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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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Temporal variation for canopy transpiration and its cooling properties in a Quercus acutissima forest of suburban Nanjing

1. Jiangsu Key Laboratory of Soil and Water Conservation and Ecological Restoration, Nanjing Forestry University, Nanjing 210037, Jiangsu, China;

2. Nanjing Forest Police College, Nanjing 210023, Jiangsu, China

Funds:

长三角水源区面源污染林业生态修复技术研究项目（201104055-1）;国家林业公益性行业重大专项（201104005）;江苏高校优势学科建设工程资助项目（PAPD）

Received Date: 2014-11-20

Rev Recd Date: 2014-12-24

Publish Date: 2015-08-20

Key words:

Abstract: Global warming and regional water resources shortage have become the focus of the global. Climate warming affects global hydrological cycles, and tree transpiration also affects climate warming. This study was conducted to analyze canopy transpiration of Quercus acutissima and to determine its cooling effect on surrounding environments. Continuous observation of the sap flow density and environmental factors, such as solar radiation, air temperature, air relative humidity, soil temperature, soil water content, used a sap flow meter and a mini weather station in Nanjing Dongshanqiao Forest Farm. Maximum sap flux density, peak daily sap flux density, transpiration heat flux, solar energy, consumed-energy coefficient, and canopy transpiration cooling was conducted according these data. Six trees of different diameter grade were observed. Results indicated that 1） the maximum sap flux density appeared at 13:00; the greatest peak daily sap flux density was 18.78 gcm-2h-1 in August, and the lowest was 13.49 gcm-2h-1 in June. 2） Canopy transpiration summed from May to October was 237.52 mm with the highest month being July. 3） July also had the greatest transpiration heat flux （154.97 MJ m-2） and solar energy （489.65 MJm-2）. The coefficient of consumed-energy for canopy transpiration was highest in August （35.8%） and lowest in October （25.8%）. 4） Canopy transpiration cooling from Q. acutissima was highest in July （3.07 ℃）, and during the growing season, canopy transpiration reduced the average temperature （2.35 0.53）℃h-1 per 10 m3 air. According to the transpiration and its cooling effect, we could choose suitable afforestation design in order to alleviate global warming and heat island effect ［Ch, 6 fig. 1 tab. 28 ref.］

Temporal variation for canopy transpiration and its cooling properties in a Quercus acutissima forest of suburban Nanjing

doi: 10.11833/j.issn.2095-0756.2015.04.006

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Related

Proportional views

Temporal variation for canopy transpiration and its cooling properties in a Quercus acutissima forest of suburban Nanjing

doi: 10.11833/j.issn.2095-0756.2015.04.006

1. Jiangsu Key Laboratory of Soil and Water Conservation and Ecological Restoration, Nanjing Forestry University, Nanjing 210037, Jiangsu, China;

2. Nanjing Forest Police College, Nanjing 210023, Jiangsu, China

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Temporal variation for canopy transpiration and its cooling properties in a Quercus acutissima forest of suburban Nanjing

doi: 10.11833/j.issn.2095-0756.2015.04.006

Abstract

Relative Article

References

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通讯作者: 陈斌, bchen63@163.com

Related

Proportional views

Temporal variation for canopy transpiration and its cooling properties in a Quercus acutissima forest of suburban Nanjing

doi: 10.11833/j.issn.2095-0756.2015.04.006

1. Jiangsu Key Laboratory of Soil and Water Conservation and Ecological Restoration, Nanjing Forestry University, Nanjing 210037, Jiangsu, China; 2. Nanjing Forest Police College, Nanjing 210023, Jiangsu, China

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1. Jiangsu Key Laboratory of Soil and Water Conservation and Ecological Restoration, Nanjing Forestry University, Nanjing 210037, Jiangsu, China;

2. Nanjing Forest Police College, Nanjing 210023, Jiangsu, China