刈割后不同程度遮荫对互花米草Spartinaalterniflora植株-广西植物.DOCVIP

DOI:10.11931/guihaia.gxzw201604005 刈割遮荫对互花米草 赵相健 李俊生 柳晓燕 宫璐 赵彩云* （中国环境科学研究院，北京 100012） 摘要：5月份刈割不同程度遮荫，地上部分和地下根茎的生长与死亡。结果表明：1）刈割在显著降低互花米草株高生物量等生长指标（P＜0.05），后生长逐渐对照水平；2）P＜0.05地上部分3.68%、2.09%和1.70%，接近全部死亡。 关键词： 中图分类号：Q945 文献标识码：A 文章编号： Combined effects of mowing and shading on growth and survival of Spartina alterniflora ZHAO Xiang-Jian, LI Jun-Sheng, LIU Xiao-Yan, GONG Lu, ZHAO Cai-Yun* (Chinese Research Academy of Environmental Sciences, Beijing 100012, China) Abstract: Spartina alterniflora, native to the Atlantic and Gulf coasts of North America, has invaded many estuaries and coasts of the world. Due to its well-developed rhizomes, seedlings usually emerged even the above-ground parts were cleared. So ensuring the death of rhizome is critical to control the weed. We examined the growth and survival rate of both above-ground parts and rhizome of S. alterniflora under only mowing and mowing＋shading treatments in Guangxi province, China. The results showed that: 1) Plant height and biomass were significantly reduced at early stage after just mowing in May (P＜0.05), while all above-ground growth characters increased during the following six months and were closed to the control group in November (P＞0.05). However, rhizome survival rate showed contrary trend to the growth characters of above-ground parts. 2) Comparing to control and only mowing groups, the mowing＋shading treatment restrained plant growth and resulted in death obviously. And the restraining effect was positively correlated with shading degree. 3) The transmittances of mowing＋layer shading net, mowing＋layers shading net and mowing＋layers shading net were 15.27%、2.29% and 0.31% respectively, and rhizome survival rate were 3.68%, 2.09% and 1.70% in November respectively. Above-ground parts were all at November in mowing＋layer shading treatment, while they were all dead at July in mowing＋double layers shading treatment and mowing＋triple layers shading treatment. Considering the cost, lastin