| Effects of drought stress on water use efficiency of five economic forest species in Gansu province |
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| DOI：10.7606/j.issn.1000-7601.2018.02.21 |
| Key Words: drought stress water use efficiency economic forest carbon isotope composition(δ13C) |
| Author Name | Affiliation | | CHONG Pei-fang | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SHAN Li-shan | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SU Shi-ping | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Yi | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| As one of the most common natural disaster in the world，drought had caused serious impact on agricultural production in China. However, one of the key factors that effected the survival rate of trees in arid areas was water use efficiency (WUE) of plant. The net photosynthesis rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), instant water use efficiency (WUEI), WUEL, total biomass and δ13C were recorded from five economic forest species (Juglans regia, Ziziphus jujuba, Lycium chinense, Hippophae rhamnoides and Zanthoxylum bungeanum) to analyze the relationship between the comparison of the foliar carbon isotope composition (δ13C) and long-term WUE (WUEL). Seedlings were grown under four soil water regimes which were CK, light drought(LD), moderate drought (MD) and severe drought (SD). Compared with CK, Pn, Tr and Gs significantly decreased with the soil water decreasing for five economic forest species, except MiD (P<0.05). For WUEI, only Z. bungeanum, Z. jujuba and L. chinense shown different water effects between SD and CK (P<0.05). Under four water treatments, H. rhamnoides had relatively higher WUEI and lower Tr than other four economic forest species. The significant differences in WUEL and δ13C for five economic forest species were only exhibited between SD and CK (P<0.05), and the WUEL of L. chinense and H. rhamnoides were higher than other three species. For total biomass, there was only significant variations in Z. bungeanum, J. regia, Z. jujuba between SD and CK (P<0.05). The relationship between WUEL and δ13C was that L. chinense and H. rhamnoides had higher correlation coefficient than other three species. These results indicated that the δ13C value could be the reliable evaluation index of WUE to select economic forest species under drought stress. Our results also indicated that L. chinense and H. rhamnoides could be selected in arid areas and other three tree species could be selected in sufficient water area of Gansu. |
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