| 凋落物物理阻隔对水杉幼苗出土和早期生长的影响 |
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| 引用本文： | 徐来仙,郭秋菊,姚兰,洪建峰,牟芙蓉,艾训儒,刘学全,赵奂敦.凋落物物理阻隔对水杉幼苗出土和早期生长的影响[J].浙江农林大学学报,2022,39(5):1018-1027. |
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| 作者姓名： | 徐来仙 郭秋菊 姚兰 洪建峰 牟芙蓉 艾训儒 刘学全 赵奂敦 |
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| 作者单位： | 1.湖北民族大学 林学园艺学院，湖北 恩施 4450002.星斗山国家级自然保护区管理局，湖北 恩施 4450003.利川市林业科学研究所，湖北 利川 4454004.湖北省林业科学研究院，湖北 武汉 430075 |
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| 基金项目： | 湖北省自然科学基金资助项目(2019CFB229)；湖北省林业科技支撑重点项目(2020LYKJ17)；2021年湖北民族大学研究生科研创新项目 |
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| 摘 要： | 目的 探讨水杉Metasequoia glyptostroboides母树凋落物物理阻隔对水杉天然更新的影响，为解除水杉天然更新障碍及保护水杉种群提供科学依据。 方法 通过野外模拟试验，对不同类型凋落物(新鲜凋落物和自然凋落物)采用0(对照)、100、300、500、700、900 g·m?2的质量梯度，分别在种子下层和上层覆盖凋落物来探究凋落物对水杉幼苗出土及早期生长的影响。 结果 ①凋落物对水杉种子出苗率和幼苗存活率产生抑制作用，在凋落物质量为300~900 g·m?2时抑制作用显著增强(P＜0.05)。②除在种子下层铺垫自然凋落物外，其余处理在凋落物质量为300 g·m?2时促进水杉幼苗苗高和地径生长，但与对照差异不显著(P＞0.05)；当凋落物质量高于300 g·m?2时，全部处理均抑制幼苗生长。随着凋落物质量的增加，对水杉幼苗根长的抑制作用逐渐增强。③随凋落物质量增加，水杉幼苗地上生物量和地下生物量呈先上升后下降的变化趋势，只有在种子下层铺垫300 g·m?2的自然凋落物处理后有一定波动，其余各处理均抑制幼苗地下生物量累积；当凋落物质量达500 g·m?2以上时，凋落物显著阻碍幼苗地上和地下生物量的累积(P＜0.05)。④同一凋落物质量下(＞300 g·m?2)，新鲜凋落物对水杉幼苗出土和早期生长的抑制作用大于自然凋落物，种子下层铺垫凋落物比种子上层覆盖凋落物的抑制作用更强。 结论 水杉母树凋落物对水杉幼苗出土和早期生长具有明显的物理阻隔作用，进而影响水杉更新生长。因此，建议在种子雨高峰期前，对水杉林下不同类型的凋落物进行及时清理，以促进水杉天然更新。图4表2参29
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| 关 键 词： | 天然更新 水杉 物理阻隔 生物量 凋落物 幼苗生长 |
| 收稿时间： | 2021-10-21 |
Effect of litter physical barrier on emergence and early growth of Metasequoia glyptostroboides seedlings |
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| XU Laixian,GUO Qiuju,YAO Lan,HONG Jianfeng,MOU Furong,AI Xunru,LIU Xuequan,ZHAO Huandun.Effect of litter physical barrier on emergence and early growth of Metasequoia glyptostroboides seedlings[J].Journal of Zhejiang A&F University,2022,39(5):1018-1027. |
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| Authors: | XU Laixian GUO Qiuju YAO Lan HONG Jianfeng MOU Furong AI Xunru LIU Xuequan ZHAO Huandun |
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| Institution: | 1.School of Forestry and Horticulture, Hubei Minzu University, Enshi 445000, Hubei, China2.Administration Bureau of Xingdoushan National Nature Reserve, Enshi 445000, Hubei, China3.Lichuan Research Institute of Forestry Science, Lichuan 445400, Hubei, China4.Hubei Academy of Forestry, Wuhan 430075, Hubei, China |
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| Abstract: | Objective This study aims to explore the effect of physical barrier of litter from Metasequoia glyptostroboides mother tree on its natural regeneration, so as to provide scientific basis for removing obstacles of M. glyptostroboides natural regeneration and protecting its population. Method Through field simulation experiments, different types of litter (fresh litter and natural litter) with different mass gradients (0, 100, 300, 500, 700 and 900 g·m?2) were used to investigate the effect of litter on emergence and early growth of M. glyptostroboides seedlings by spreading litter on the lower layer of seeds and covering litter on the upper layer of seeds. Result (1) Litter inhibited the seed emergence rate and seedling survival rate of M. glyptostroboides, and the inhibitory effect was significantly enhanced when the litter mass was 300?900 g·m?2 (P＜0.05). (2) Except for spreading natural litter on the lower layer of seeds, the other treatments promoted the growth of seedling height and ground diameter M. glyptostroboides seedlings when the litter mass was 300 g·m?2 (P＞0.05), but the difference with the control was not significant. When the litter mass was higher than 300 g·m?2, all treatments inhibited seedling growth. With the increase of litter mass, the inhibitory effect on the root length of M. glyptostroboides seedlings enhanced gradually. (3) With the increase of litter mass, the aboveground biomass and underground biomass of M. glyptostroboides seedlings first increased and then decreased. There was a certain fluctuation only after 300 g·m?2 natural litter treatment on the low layer of seeds, and the other treatments inhibited the underground biomass accumulation of seedlings. The accumulation of aboveground and underground biomass of seedlings was significantly hindered when the litter mass was above 500 g·m?2 (P＜0.05). (4) Under the same litter mass (＞300 g·m?2), the inhibitory effect of fresh litter on the emergence and early growth of M. glyptostroboides seedling was greater than that of natural litter, and the inhibitory effect of litter on the lower layer of seeds was stronger than that on the upper layer of seeds. Conclusion The litter of M. glyptostroboides mother tree has an obvious physical barrier effect on the emergence and early growth of M. glyptostroboides seedlings, which affects the natural regeneration of M. glyptostroboides. Therefore, it is suggested to treat the litter of different types under M. glyptostroboides forests in time before the peak of seed rain, so as to promote the natural regeneration of M. glyptostroboides. Ch, 4 fig. 2 tab. 29 ref.] |
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