不同水分条件下黄荆条对其冠下青冈栎和茶条木幼苗生长的影响

生态学杂志

不同水分条件下黄荆条对其冠下青冈栎和茶条木幼苗生长的影响

黄甫昭,韦春强,李先琨,陆树华,吕仕洪^*

(广西喀斯特植物保育与恢复生态学重点实验室(广西壮族自治区中国科学院广西植物研究所)，广西桂林 541006)

出版日期:2017-02-10 发布日期:2017-02-10

The effects of Vitex negundo on seedlings of Cyclobalanopsis glauca and Delavaya toxocarpa with different moisture conditions.

HUANG Fu-zhao, WEI Chun-qiang, LI Xian-kun, LU Shu-hua, LV Shi-hong^*#br#

(Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy Sciences, Guilin 541006).

Online:2017-02-10 Published:2017-02-10

摘要/Abstract

摘要： 为选择适宜物种来优化和改善岩溶石漠化地区先锋群落的结构，本文采用盆栽控水实验来检验不同水分条件下先锋灌木黄荆条对其树冠下青冈栎和茶条木幼苗的影响。结果表明：不管是处于黄荆条树冠下还是空地上青冈栎和茶条木幼苗的地径、株高相对生长率都随着水分条件的改善而增大；同一水分条件下，树冠下幼苗的相对生长率总低于空地上，且这种差距随水分增加逐渐增大；青冈栎幼苗叶片的相对叶绿素含量(SPAD)在空地上随水分增加无明显变化，树冠下随水分增加而增大；茶条木的SPAD值在空地上随水分增加而增大，树冠下无明显变化；同一水分条件下，空地上青冈栎和茶条木的SPAD值总高于黄荆条树冠下；各水分条件下，青冈栎和茶条木的相对邻接效应指数（RNE）都为负值，且随水分增大RNE的绝对值越大。因此，先锋灌木黄荆条对其树冠下的青冈栎和茶条木幼苗生长起到抑制作用，且这种抑制作用随着水分条件改善而增强。

Abstract: In order to choose the appropriate species to improve and optimize the pioneer communities in Southwest China karst area, a pot experiment was conducted to test the effects of Vitex negundo on seedlings of Cyclobalanopsis glauca and Delavaya toxocarpa under the Vitex negundo canopy with different moisture conditions. The results indicated that relative growth rate of ground diameter and plant height of C. glauca and D. toxocarpa increased with soil moisture conditions. The relative growth rate of seedling under canopy of V. negundo was always lower than the open sites in the same water condition, and the difference increased with the soil moisture. SPAD of C. glauca in open site had no obvious changes in all moisture conditions, but increased with soil moisture under canopy of V. negundo. SPAD of D. toxocarpa in the open site increased with soil moisture, but showed no differences under canopy of V. negundo. SPAD of C. glauca and D. toxocarpa in the open site was always higher than under canopy of V. negundo in the same moisture condition. Relative neighbor effect of C. glauca and D. toxocarpa was negative in all moisture conditions and increased with soil moisture. The pioneer shrub V. negundo inhibited the growth of C. glauca and D. toxocarpa seedlings under canopy of V. negundo, and the inhibiting effect increased with soil moisture.

黄甫昭,韦春强,李先琨,陆树华,吕仕洪*. 不同水分条件下黄荆条对其冠下青冈栎和茶条木幼苗生长的影响[J]. 生态学杂志.

HUANG Fu-zhao, WEI Chun-qiang, LI Xian-kun, LU Shu-hua, LV Shi-hong*. The effects of Vitex negundo on seedlings of Cyclobalanopsis glauca and Delavaya toxocarpa with different moisture conditions. [J]. cje.