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当前位置: 首页 > 文章 > 土壤水分胁迫对新疆大叶苜蓿构件生物量分配的影响 干旱区研究 2019 (3) 639-644
Position: Home > Articles > Effects of Soil Moisture Stress on Biomass Allocation of Medicago sativa cv. Xinjiangdaye Arid Zone Research 2019 (3) 639-644

土壤水分胁迫对新疆大叶苜蓿构件生物量分配的影响

作  者：
柳佳;罗永忠;陈国鹏
单  位：
甘肃农业大学林学院
关键词：
新疆大叶苜蓿;土壤水分胁迫;构件;生物量分配
摘  要：
以新疆大叶苜蓿为试验材料,采用盆栽法揭示不同土壤水分胁迫(田间持水量的85%,65%,45%)下新疆大叶苜蓿构件生物量的变化状况。结果表明:(1)轻度水分胁迫下,新疆大叶苜蓿干重生物量最高,主根最长,分枝数、叶片数最多;(2)细根数量、干重生物量、构件占比和生长速率均呈现重度水分胁迫>轻度水分胁迫>充分供水的规律;(3)不同土壤水分胁迫使构件生物量的分配占比呈现不同规律,充分供水与轻度水分胁迫下遵循:茎构件>叶构件>根构件>花构件的规律,而重度水分胁迫下遵循:根构件>茎构件>叶构件>花构件的规律;(4)轻度水分胁迫下根茎比和地下与地上部分比最佳,植株适应干旱环境且生长健壮。该结果为揭示作物高效用水机制提供科学依据,为干旱、半干旱地区新疆大叶苜蓿的增产提供理论依据。
译  名：
Effects of Soil Moisture Stress on Biomass Allocation of Medicago sativa cv. Xinjiangdaye
作  者：
LIU Jia;LUO Yong-zhong;CHEN Guo-peng;College of Forestry,Gansu Agricultural University;
单  位：
LIU Jia%LUO Yong-zhong%CHEN Guo-peng%College of Forestry,Gansu Agricultural University
关键词：
Medicago sativa cv.Xinjiangdaye;;soil water stress;;component;;biomass allocation
摘  要：
In this study,Medicago sativa cv. Xinjiangdaye was taken as the experimental material,and the pot culture experiment was adopted to reveal the change of component biomass of Medicago sativa cv. Xinjiangdaye under different soil moisture stresses( the field capacities were 85%,65% and 45% respectively). The results showed that:(1) Under slight water stress,the values of dry weight biomass,taproot length,branch number and leaf number of Medicago sativa cv. Xinjiangdaye were the highest;(2) The number,dry weight biomass,proportion and growth rate of fine roots of Medicago sativa cv. Xinjiangdaye were in an order of severe water stress > slight water stress > full water supply;(3) The allocation proportion of component biomass under different soil water stresses was different. Under full water supply and slight water stress,the proportion was in an order of stem component > leaf component > root component > flower component; under the severe water stress,however,it was in an order of root component > stem component > leaf component > flower component;(4) Under slight water stress,the rhizome ratio and the ratio between underground biomass and aboveground biomass were the best,and the plants adapted to the dry environment and could grow healthly. The study results could provide a scientific basis for revealing the efficient water use mechanism of crops and theoretical basis for increasing the yield of Medicago sativa cv. Xinjiangdaye in arid and semiarid regions.

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