LIU Shutong,JIAO Juying,HU Shu,et al.Effect of Flood Runoff on Seed Dispersal and Population Regeneration—A Case Study of Salix matsudana in the Loess Hill and Gully Region[J].Research of Soil and Water Conservation,2018,25(01):99-103.
洪水径流对种子传播及种群更新的影响——以黄土丘陵沟壑区旱柳为例
- Title:
- Effect of Flood Runoff on Seed Dispersal and Population Regeneration—A Case Study of Salix matsudana in the Loess Hill and Gully Region
- Keywords:
- Salix matsudana; seeds; post-dispersal; flood runoff; check dam
- 分类号:
- Q145
- 摘要:
- 针对2013年暴雨后旱柳在两个淤地坝坝地内成片密集生长的现象，对两个坝控流域内旱柳生长分布特征及繁殖方式进行了调查与分析。结果表明：（1）1号淤地坝控流域内的成树与幼树分布面积、胸径、树高与密度总体上均高于2号坝控流域，2号坝控流域内沟谷数量少且较浅，相反1号坝控流域内密集分布的地势低洼的沟谷为旱柳提供了适宜的生长条件，同时数量较多的高大成树提供了丰富种源，造就了种子扩散距离上的优势；（2）2013年与2014年降雨产生的地表径流携泥沙淤积于坝地，提高了土壤水肥条件，为旱柳的萌发与生长提供了有利条件；（3）幼树多分布于坝地上且均为两年生实生苗，少量萌生苗分布于支沟沟口，主要原因为2014年与2015年降雨所产生的地表径流均将坝控流域地表中存活的旱柳种子传播并聚集于坝地上，此时坝地水肥条件良好，促进了种子萌发和幼苗生长。研究表明地表径流会促进植物种子扩散，将种子传播至适宜其萌发和幼苗建成的生境，从而影响种群更新格局。
- Abstract:
- With respect to the mat growth of Salix matsudana seedlings in both two check-dams after the heavy rains, the growth and distribution characteristics and mode of reproduction of Salix matsudana were investigated in the catchment with two check-dams. The results indicate that the distribution area, diameter of breast height (DBH), tree height and density of mature and young Salix matsudana in the catchment of check dam 1 are larger than those in the catchment of check dam 2. The larger area, DBH, tree height and density of Salix matsudana in check dam 1 were attributed to more low-lying valleys in check dam 1 than check dam 2, which creates suitable conditions for the growing of Salix matsudana. In addition, the wide distribution of adult Salix matsudana in check dam 1 has provided abundant seeds, leading to the predominance of seed dispersal distance. Flood runoff during 2013 and 2014 has transferred sediment to the dam land, causing increase of soil moisture and fertility conditions on dam land. The saplings of Salix matsudana are mostly found on the dam land, which come from seed propagation and germinated two years ago, some of them on outfall-land of valleys, which mostly come from vegetative propagation. Rainfall runoff during 2014 and 2015 has carried and gathered seeds of Salix matsudana to the dam land where is already suitable for seed germination and seedling growth. Overall, these results show that overland runoff can promote seed dispersal by taking seeds to habitats which are suitable for seed germination and seedling establishment, and even influence the pattern of population regeneration.
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相似文献/References:
[1]廖超英,肖智.花棒种子及枝叶化学成分研究[J].水土保持研究,1995,2(02):146.
Liao Chaoying,Xiao Zhi.Chemical Composition of the Seeds, Twigs and Leaves of Hedysarum scoparium[J].Research of Soil and Water Conservation,1995,2(01):146.
[2]廖超英,肖智,张宇清.踏郎种子、嫩枝及叶的化学成分[J].水土保持研究,1995,2(02):150.
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备注/Memo
收稿日期:2017-5-18;改回日期:2017-6-2。
基金项目:国家自然科学基金面上项目“黄丘区坡面退耕与淤地坝对坡沟系统侵蚀产沙的阻控机理”（41371280）
作者简介:刘姝彤(1996-),女,山东兰陵人,硕士研究生,研究方向为流域生态学。E-mail:1047034096@qq.com
通讯作者:焦菊英(1965-),女,陕西宝鸡人,博士,研究员,主要从事流域侵蚀产沙、土壤侵蚀与植被关系及水土保持效益评价研究。E-mail:jyjiao@ms.iswc.ac.cn