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Water-Use Efficiency of Typical Afforestation Tree Species in Liaoning, P.R. China and Their Response to Environmental Factors


Affiliations
1 Forestry College, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
2 Tokyo University of Agriculture, Tokyo, 156-8502, Japan
 

This study aimed to make a reasonable use of forests in Liaoning province. By using C-isotope (leaf δ13C value) as an index for long-term water-use efficiency (WUE), we evaluated the WUE of three typical afforestation tree species, namely, Pinus sylvestris var. mongolica, Pinus tabulaeformis, and Quercus mongolica. We then determined their response to environmental factors, such as annual average precipitation, annual average air temperature, altitude, and soil nutrient. Results of linear regression analysis indicate that (1) the δ13C values of the three tree species were -30.37‰ to - 23.51‰, and the δ13C values in their leaves decreased with the longitudes. (2) The δ13C values in the leaves of the three tree species were significantly influenced by the annual average precipitation and altitude, i.e., the δ13C values decreased significantly with the annual average precipitation and increased with altitude, although the δ13C values in their leaves were less influenced by the annual average air temperature. (3) Except soil nutrients, such as calcium contents, which showed no obvious relationship with δ13C of Q. mongolica, P. sylvestris and P. tabulaeformis were significantly affected by soil nutrients. This work was the first to investigate the WUE of the three tree species mentioned above. This study also explored the main factors influencing WUE. Overall, our findings may facilitate future scientific studies on WUE based on δ13C, and these studies will be beneficial to environmental protection.

Keywords

δ13C, Water-Use Efficiency, Afforestation, Environmental Factors, Soil Nutrient.
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  • Water-Use Efficiency of Typical Afforestation Tree Species in Liaoning, P.R. China and Their Response to Environmental Factors

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Authors

Jinghao Li
Forestry College, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
Jifeng Deng
Forestry College, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
Yongbin Zhou
Forestry College, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
You Yin
Forestry College, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
Yawei Wei
Forestry College, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
Yanli Jing
Forestry College, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
Ruohan Zhang
Tokyo University of Agriculture, Tokyo, 156-8502, Japan

Abstract


This study aimed to make a reasonable use of forests in Liaoning province. By using C-isotope (leaf δ13C value) as an index for long-term water-use efficiency (WUE), we evaluated the WUE of three typical afforestation tree species, namely, Pinus sylvestris var. mongolica, Pinus tabulaeformis, and Quercus mongolica. We then determined their response to environmental factors, such as annual average precipitation, annual average air temperature, altitude, and soil nutrient. Results of linear regression analysis indicate that (1) the δ13C values of the three tree species were -30.37‰ to - 23.51‰, and the δ13C values in their leaves decreased with the longitudes. (2) The δ13C values in the leaves of the three tree species were significantly influenced by the annual average precipitation and altitude, i.e., the δ13C values decreased significantly with the annual average precipitation and increased with altitude, although the δ13C values in their leaves were less influenced by the annual average air temperature. (3) Except soil nutrients, such as calcium contents, which showed no obvious relationship with δ13C of Q. mongolica, P. sylvestris and P. tabulaeformis were significantly affected by soil nutrients. This work was the first to investigate the WUE of the three tree species mentioned above. This study also explored the main factors influencing WUE. Overall, our findings may facilitate future scientific studies on WUE based on δ13C, and these studies will be beneficial to environmental protection.

Keywords


δ13C, Water-Use Efficiency, Afforestation, Environmental Factors, Soil Nutrient.

References