干旱地区农业研究2018，Vol.36Issue(2)：137-143,7.DOI:10.7606/j.issn.1000-7601.2018.02.21
干旱胁迫对甘肃地区5种经济林苗木水分利用效率的影响
Effects of drought stress on water use efficiency of five economic forest species in Gansu province
摘要
Abstract
As one of the most common natural disaster in the world ,drought had caused serious impact on agricul-tural 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 δ13 C 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 (δ 13 C ) and long-term WUE ( WUEL ) . Seedlings were grown under four soil water regimes which were CK ,light drought (LD ) ,moderate drought (MD ) and se-vere drought (SD ) .Compared with CK , Pn , Tr and Gs significantly decreased with the soil water decreasing for five e-conomic 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 high-er WUEI and lower Tr than other four economic forest species .The significant differences in WUEL andδ13 C for five e-conomic 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 andδ13C was that L . chinense and H . rhamnoides had higher correlation coefficient than other three species .These results indicated that theδ13 C 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 .关键词
干旱胁迫/水分利用效率/经济林/稳定性碳同位素比率(δ13C)Key words
drought stress/water use efficiency/economic forest/carbon isotope composition (δ13 C )分类
农业科技引用本文复制引用
种培芳,单立山,苏世平,李毅..干旱胁迫对甘肃地区5种经济林苗木水分利用效率的影响[J].干旱地区农业研究,2018,36(2):137-143,7.基金项目
甘肃省财政厅高等学校基本科研业务费项目(038-041013) （038-041013）
国家自然科学基金项目(41461044) （41461044）
