不同添加剂对干旱胁迫下高粱种子发芽的影响

为了“变废为宝”，使“工业三废”（木质素、低密度聚乙烯再生料(RLDPE)、皮胶）在治理日益严重的土地沙漠化措施中得到有效的利用，改善人类的生存环境。实验以高粱种子为发芽材料，通过在风成沙中添加不同浓度木质素、低密度聚乙烯再生料、皮胶形成沙基质，采用沙培法，在25℃的恒温箱中培养7天以上，研究了0%、2.5%、5%、7.5%和10%木质素、RLDPE、皮胶及0%、0.5%、1%、2%、4%和8% 皮胶掺量的沙基质中高粱种子的发芽率、发芽指数。结果表明，在风成沙中，添加10%木质素时，发芽率最高为86.7%；添加2.5% RLDPE时，发芽率最高为93.3%；添加>2.5%皮胶，发芽率均不及对照，故降低皮胶添加浓度，添加0.5%皮胶时，发芽率最高为75%。对干旱胁迫下种子发芽率影响显著性为RLDPE>木质素>皮胶。

Effect of Different Additives on Germination of Sorghum Seeds Under Drought Stress

The study aims to make waste profitable, effectively use the "three industrial wastes" (lignin, recycled low density polyethylene (RLDPE), leather cement) in the governance of growing land desertification, and improve the human living environment. The author took sorghum seeds as materials, and the sand substrates were formed by adding different concentrations of lignin, recycled low density polyethylene (RLDPE), leather cement in aeolian sand. Then the sand substrates were cultivated in the thermostat at 25℃ for more than 7days by adopting the sand culture method. After that, the author studied the germination rate and germination index of sorghum seeds under the conditions of 0%, 2.5%, 5%, 7.5%, 10% lignin, RLDPE, leather cement and 0%, 0.5%, 1%, 2%, 4%, 8% leather cement in aeolian sand, respectively. The results showed that in the aeolian sand, when adding 10% lignin, the germination rate was up to 86.7%. When adding 2.5% RLDPE, the germination rate was as high as 93.3%. However, when adding more than 2.5% leather cement, the germination rate was not as good as that of the control. Therefore, the author reduced the concentration of leather cement, and founded that when adding 0.5% leather cement, the highest germination rate was 75%. Therefore, the influence of the additives on seed germination rate under drought stress was in an order as RLDPE > lignin >leather cement.