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以溶液培养的棉花(Gossypium hirsutum)幼苗为材料,测定了不同盐胁迫程度和不同通气状况下棉花幼苗株高、根系体积、根系和茎叶生物量以及灰分含量的变化,以探索根际通气状况对盐胁迫下棉花生长的影响。结果表明,盐胁迫抑制棉花植株生长,表现为植株变矮、叶面积减小和干物质积累下降;根际环境通气不良也会导致棉花幼苗生长受抑制、干物质积累下降和矿质元素吸收减少等。进一步比较盐胁迫和根际通气状况及两者组合作用对棉苗生长的影响,发现盐胁迫对株高和总生物量的影响较大,而根际通气状况对根系体积、根系生物量、根冠比和矿质元素吸收的影响较大。总体表现为:盐胁迫对茎叶生长的不利影响较大,而根际通气状况对根系生长的不利影响较大。同时,在根际环境通气良好的条件下,不同程度盐胁迫导致的棉花幼苗株高、根系体积、叶面积、根系生物量和总生物量的变化程度远小于根际环境通气不良条件下的变化程度。实验结果表明,根际环境通气良好可以减弱盐胁迫对棉花生长发育的抑制作用,而根际环境通气不良则会加重盐胁迫的不利影响。
Cotton (Gossypium hirsutum) seedlings were used as materials to measure the changes of plant height, root volume, root system, stem and leaf biomass and ash content of cotton seedling under different salt stress and aeration conditions in order to explore the situation of rhizospheric aeration Effects of Salt Stress on Cotton Growth. The results showed that salt stress inhibited the growth of cotton plants, which showed that the plants became shorter, the leaf area decreased and the dry matter accumulation decreased. The poor rhizospheric environmental ventilation could also lead to the inhibition of cotton seedling growth, the decrease of dry matter accumulation and the decrease of mineral elements absorption . Further comparison of salt stress and rhizospheric aeration and their combination effect on the growth of cotton seedlings showed that salt stress had a great effect on plant height and total biomass. However, the effects of rhizospheric aeration on root volume, root biomass, Crown than the absorption of mineral elements and greater impact. The overall performance is as follows: The adverse effects of salt stress on the growth of stems and leaves are larger, but the adverse effects of rhizospheric aeration on root growth are larger. At the same time, the changes of plant height, root volume, leaf area, root biomass and total biomass of cotton seedlings caused by salt stress were much less than those under rhizospheric environmental ventilation under the good rhizospheric aeration conditions degree. The experimental results showed that good rhizospheric aeration could reduce the inhibitory effect of salt stress on cotton growth and development, while poor rhizospheric ventilation would aggravate the adverse effects of salt stress.