模拟沙埋对三峡库区低位消落带狗牙根恢复生长的影响

摘要/Abstract

摘要： 以三峡库区低位消落带的狗牙根植株为研究对象，探讨不同沙埋深度对淹水后狗牙根萌发和生长恢复的影响。结果表明: 10 cm沙埋显著抑制了狗牙根的萌发，其萌发率降低15.5%，而20 cm沙埋作用相反，萌发率增加75.9%；10 cm沙埋条件下萌发苗能穿透覆盖层形成分株，而20 cm沙埋条件下无法形成分株；前者的茎长、茎宽、茎节数、总茎节数、茎节数/茎长、叶长、叶片数、鲜重、干重和干鲜重比分别比对照高19.2%、8.2%、45.4%、16.8%、42.7%、7.2%、4.0%、19.1%、35.3%、13.5%，而后者的茎长、茎节数、鲜重、干重和干鲜重比分别比对照低76.3%、20.3%、88.3%、92.6%、36.7%；10 cm沙埋条件下狗牙根萌发苗的总茎长、总叶片数、总鲜重、总干重及其与种群总生物量的鲜重比、干重比分别比对照低4.2%、36.3%、31.9%、22.7%、24.4%、12.4%，20 cm沙埋条件下萌发苗的总茎长、总鲜重、总干重及其与种群总生物量的鲜重比、干重比分别比对照低65.3%、74.5%、83.8%、76.4%、86.7%；10 cm沙埋能促进狗牙根萌发苗茎、叶的伸长以及茎节、叶片的形成，以降低逆境伤害；但是20 cm沙埋导致萌发苗无法正常生长发育。

关键词: 群落结构, 云杉次生林, 空间格局, 物种组成

Abstract: To study influence of sand burial depths on the sprouting and growth of Cynodon dactylon in low-water-levelfluctuating zone of the Three Gorges Reservoir after flooding, C. dactylon was transplanted and buried by 10 cm and 20 cm depth sands, respectively. Results showed that 10cmdepth sand burial significantly inhibited the sprouting of C. dactylon, and its sprouting rate was reduced by 15.5%. On the contrary, 20cmdepth sand burial increased the sprouting rate by 75.9%. During the experiment, sprouted seedlings of 10cmdepth sand burial could penetrate the cover layer of the sands and formed ramets, but the seedlings of 20cmdepth sand burial couldn’t. For the former, stem length, stem width, internode number, total internode number, ratio of internode number to stem length, leaf length, leaf number, fresh weight, dry weight, ratio of dry weight to fresh weight were 19.2%, 8.2%, 45.4%, 16.8%, 42.7%, 7.2%, 4.0%, 19.1%, 35.3%, and 13.5% higher than those of the control, respectively. However, for the latter, stem length, internode number, fresh weight, dry weight, ratio of dry weight to fresh weight were 76.3%, 20.3%, 88.3%, 92.6%, and 36.7% lower than those of the control, respectively. Furthermore, under the 10cmdepth sand burial, total stem length of seedlings, total leaf number of seedlings, total fresh weight of seedlings, total dry weight of seedlings, ratio of total fresh weight of seedlings to total population fresh weight, ratio of total dry weight of seedlings to total population dry weight were 4.2%, 36.3%, 31.9%, 22.7%, 24.4%, and 12.4% lower than under the control, respectively. Under the 20cmdepth sand burial, total stem length, total fresh weight of seedlings, total dry weight of seedlings, ratio of total fresh weight of seedlings to total population fresh weight, ratio of total dry weight of seedlings to total population dry weight were 65.3%, 74.5%, 83.8%, 76.4%, and 86.7% lower than under the control, respectively. These results indicated that 10cmdepth sand burial could promote the elongation of stems and leaves and the formation of internodes and leaves of C. dactylon, reducing sand burial’s injury. However, 20cmdepth sand burial couldn’t make seedlings grow normally.

Key words: community structure, secondary Picea forest, spatial pattern, species composition

李强**,丁武泉,朱启红,宋力. 模拟沙埋对三峡库区低位消落带狗牙根恢复生长的影响[J]. 生态学杂志.

LI Qiang**, DING Wu-quan, ZHU Qi-hong, SONG Li. Influence of simulated sand burial on recovery growth of Cynodon dactylon in lowwaterlevelfluctuating zone of the Three Gorges Reservoir.[J]. cje.

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模拟沙埋对三峡库区低位消落带狗牙根恢复生长的影响

Influence of simulated sand burial on recovery growth of Cynodon dactylon in lowwaterlevelfluctuating zone of the Three Gorges Reservoir.

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