摘要
模拟了周调节水库的消落情况,对香根草和狗牙根的淹水环境适应性进行比对。结果表明,周调节水库消落带上单种的香根草、狗牙根的各项形态指标均明显低于岸坡未受淹的植株,生长和繁殖受到淹水环境的抑制;香根草在整个试验期内都保持较高的成活率,生长稳定。随着冬季的到来,香根草的生长速度变缓,覆盖率有所降低,保持在40%~45%,且在春季发芽恢复生长;狗牙根在冬季成活率降至60%,覆盖率降至0~5%,明显低于岸坡未受淹的狗牙根,春季狗牙根能够重新发芽生长,复绿较快。从耐淹性来看,香根草淹水14 d后仍能正常生长,狗牙根淹水14 d后大部分死亡,香根草的耐淹性优于狗牙根。总体来看,香根草比狗牙根更适合作为广东地区消落带植被恢复的备选植物。
This study is aimed to evaluate the adaptation of Vetiveria zizanioides and Cynodon dactylon to the simulated fluctuation of weekly regulating reservoir. The results show that the morphological indices of all the two species on hydro-fluctuation belt were significantly lower than that on banks. Vetiveria zizanioides had a high survival rate in the whole experiment. With the winter arriving Vetiveria zizanioides became to grow slowly and their coverage rate dropped to 40%-45%, and in the spring, they grew rapidly. In winter, the survival rate of Cynodon dactylon dropped to 60%, and the survival rate was 0-5%, which was significantly lower than that on banks. In the next spring, Cynodon dactylon regerminated. For the flooding resistance, Vetiveria zizanioides can grow normally after submerged for 14 days, while most of the Cynodon dactylon died after submerged for 14 days. In conclusion, Vetiveria zizanioides is more suitable as an alternative plant for vegetation restoration in Hydro-fluctuation belt in Guangdong Province.
出处
《环境保护与循环经济》
2018年第4期41-45,共5页
environmental protection and circular economy
基金
广州市荔湾区科技计划项目(20132115012)
广东省水利科技创新项目成果(2014-05)
关键词
消落带
淹水环境
香根草
狗牙根
hydro-fluctuation belt
flooding
Vetiveria zizanioides
Cynodon dactylon
