摘要
榆林市迅速发展的煤炭加工产业生产过程中并未充分重视疏干水利用,导致土壤及地表水严重污染。为探究重金属污染对榆林地区植物生长的影响,给当地受污染土壤治理树种选择提供依据,以沙棘(Hippophae rhamnoides)为对象,设置10、20、40、80、100、200 mg·L^(-1)等不同浓度梯度Cd^(2+)溶液,研究重金属镉(Cd)胁迫对沙棘种子萌发及幼苗生长的影响。结果表明:低浓度Cd^(2+)刺激幼苗的生长,在Cd^(2+)溶液浓度为40 mg·L^(-1)时,发芽率、发芽势均达到最大值;在处理初期,Cd^(2+)对幼苗根长的影响就表现为抑制效应,并且Cd^(2+)对幼苗根长的影响比苗高的影响显著。随着植物生长时间的延长,低浓度的刺激效应逐渐消失,并且随浓度的提高,抑制效应逐渐增强,发芽指数和活力指数均在Cd^(2+)溶液浓度为200 mg·L^(-1)处达到最低值。
The production process of the rapidly developing coal processing industry in Yulin City did not pay sufficient attention to the use of drainage water, resulting in serious pollution of soil and surface water. To investigate the effects of heavy metal pollution on plant growth in Yulin and to provide a basis for the selection of tree species for local treatment of contaminated soil, sea buckthorn(Hippophae rhamnoides) was subjected to different concentration gradients of Cd^(2+)solutions such as 10, 20, 40, 80, 100 and 200 mg·L^(-1)to study the effects of heavy metal cadmium(Cd) stress on seed germination and seedling growth were investigated. The results showed that the low concentration of Cd^(2+)stimulated the growth of seedlings, and the germination rate and germination potential reached the maximum at the concentration of 40 mg·L^(-1)of Cd^(2+)solution;the effect of Cd^(2+)on the root length of seedlings showed an inhibitory effect at the early stage of treatment, and the effect of Cd^(2+)on the root length of seedlings was more significant than that of seedling height. With the extension of plant growth time, the stimulation effect of low concentration gradually disappeared, and the inhibition effect gradually raised with the increased concentration, and the germination index and vigor index both reached the lowest value at the concentration of Cd^(2+)solution of 200 mg·L^(-1).
作者
王梓瑜
李林山
狄龙
张高如
段义忠
Wang Zi-yu;Li Lin-shan;Di Long;Zhang Gao-ru;Duan Yi-zhong(Shaanxi Key Laboratory Ecological Restoration in Northern Shaanxi Mining Area,Yulin University,Yulin Shaanxi 719000;Yulin Forestry and Grassland Bureau/Yulin Forestry Industry Development Center,Yulin Shaanxi 719000)
出处
《陕西林业科技》
2022年第6期21-25,共5页
Shaanxi Forest Science and Technology
关键词
Cd^(2+)溶液
浓度
沙棘
种子
发芽率
幼苗生长
Cd^(2+)solution
concentration
sea buckthorn
seeds
germination rate
seedling growth
