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元谋干热河谷地区新银合欢天然更新的初步调查

宗亦臣1,2;郑勇奇1,2;张川红1,2;段福文3;王志和3   

  1. 1中国林业科学研究院林业研究所, 北京 100091;
    2国家林业局林木培育实验室, 北京 100091;
    3云南省楚雄州林业科学研究所, 云南楚雄 675005
  • 收稿日期:2006-01-25 修回日期:2006-09-08 出版日期:2007-01-10 发布日期:2007-01-10

Natural regeneration of Leucaena leucocephala in Yuanmou dry-hot valley

ZONG Yi-chen1,2;ZHENG Yong-qi1,2;ZHANG Chuan-hong1,2;DUAN Fu-wen3;WANG Zhi-he3   

  1. 1Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China;
    2Laboratory of Tree Breeding and Cultivation, State Forestry Administration,
    Beijing 100091, China;
    3Chuxiong Institute of Forestry Science, Chuxiong 675005, Yunnan, China
  • Received:2006-01-25 Revised:2006-09-08 Online:2007-01-10 Published:2007-01-10

摘要: 通过2005年6和10月对元谋干热河谷地区新银合欢人工林的调查,发现新银合欢林下幼苗数量较多,经过对幼苗刨根后,发现林下的新银合欢幼苗均为种子实生苗,表明新银合欢是通过种子繁殖来完成天然更新。新银合欢单株结实量在602~1 513粒,树体高大的结实量多;其林下幼苗生长良好,更新密度最低为368株·m-2,最高达960株·m-2;新银合欢林缘幼苗最远扩散距离为58.3 m,幼苗的扩散范围主要集中在距离林缘10 m的区域内,种子受风力和流水的影响,可以沿沟谷传播很远。

关键词: 浮游动物, 生态特征, 春季, 东海, 赤潮

Abstract: In this paper, an investigation was made on the Leucaena leucocephala plantations in Yuanmou dry-hot valley in June and October 2005. Under the plantations, there were a great many of seedlings, and all of them were generated from seeds, suggesting that L. leucocephala could naturally regenerate from seed. The seed quantity per tree was from 602 to 1 513, and high trees had more seeds. The seedlings were growing well, with a minimum renewal density of 960 plants per square meter and a maximum renewal density of 960 plants per square meter.The longest dispersal distance of the seedlings was 583 m from the edge of L. leucocephala stand, and the dispersal range was mostly in an area 10 m from the stand. The seeds could be dispersed to a far distance along the valley by wind and running water.

Key words: Zooplankton, Ecological characteristics, Spring, East China Sea, Red tide