An Evaluation of Physically Based and Empirically Determined Evapotranspiration Models for Nursery Plants

H. KIRNAK

Makale detayları

An Evaluation of Physically Based and Empirically Determined Evapotranspiration Models for Nursery Plants

Yazarlar:

H. KIRNAK

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Agriculture and Forestry 2002 Vol.26 Issue 6, pp.355-362

Belge Tipi:

Makale

Yayın Tarihi:

5/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000809406

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X

Anahtar kelimeler:

Özet:

 

A lysimeter study was conducted to determine the evapotranspiration (ET) rates of Red Sunset red maple (Acer Rubrum 'Red Sunset') nursery trees under outdoor conditions in August and September 1997. The average ET rate was 0.084  mm day-1. This measured ET rate was compared with calculated ET rates based on four physical ET (i.e., Penman, Penman-Monteith, Stanghellini and Fynn) and two empirically determined ET models (vapor pressure deficit (VPD) and solar radiation based empirical ET models). The Penman-Monteith and Penman models overestimated the measured ET rate by 15% and 31%, respectively while the Stanghellini and Fynn models underestimated the measured ET rates by 19.7% and 16.3% with R2 values of 0.70, 0.582, 0.645 and 0.644, respectively. The linear regression analyses showed that the single variables solar radiation and vapor pressure deficit each correlated with ET and R2 values of 0.750 and 0.650 respectively. This study showed that VPD or solar radiation based empirical ET models could be used to predict ET rates of nursery plants if there is difficulty in running the physically based ET model due to a lack of input parameters.

 

A lysimeter study was conducted to determine the evapotranspiration (ET) rates of Red Sunset red maple (Acer Rubrum 'Red Sunset') nursery trees under outdoor conditions in August and September 1997. The average ET rate was 0.084  mm day-1. This measured ET rate was compared with calculated ET rates based on four physical ET (i.e., Penman, Penman-Monteith, Stanghellini and Fynn) and two empirically determined ET models (vapor pressure deficit (VPD) and solar radiation based empirical ET models). The Penman-Monteith and Penman models overestimated the measured ET rate by 15% and 31%, respectively while the Stanghellini and Fynn models underestimated the measured ET rates by 19.7% and 16.3% with R2 values of 0.70, 0.582, 0.645 and 0.644, respectively. The linear regression analyses showed that the single variables solar radiation and vapor pressure deficit each correlated with ET and R2 values of 0.750 and 0.650 respectively. This study showed that VPD or solar radiation based empirical ET models could be used to predict ET rates of nursery plants if there is difficulty in running the physically based ET model due to a lack of input parameters.

Makale detayları

An Evaluation of Physically Based and Empirically Determined Evapotranspiration Models for Nursery Plants

Yazarlar:

H. KIRNAK

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Agriculture and Forestry 2002 Vol.26 Issue 6, pp.355-362

Belge Tipi:

Makale

Yayın Tarihi:

5/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000809406

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X

Transpiration

evapotranspiration

nursery production

combination models

Sayı

Makale detayları

An Evaluation of Physically Based and Empirically Determined Evapotranspiration Models for Nursery Plants

Yazarlar: H. KIRNAK

Yayıncı: TUBITAK

Dergi: Turkish Journal of Agriculture and Forestry 2002 Vol.26 Issue 6, pp.355-362

Belge Tipi: Makale

Yayın Tarihi: 5/2002

Belge Dili: Türkçe

Document ID (Org No.): 2000809406

Sıklık: İki Aylık

eISSN: 1303-6173

pISSN: 1300-011X

Transpiration

evapotranspiration

nursery production

combination models

Sayı

Yazarlar:

H. KIRNAK

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Agriculture and Forestry 2002 Vol.26 Issue 6, pp.355-362

Belge Tipi:

Makale

Yayın Tarihi:

5/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000809406

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X