对江苏省泥质海岸带海堤12年生杨树-刺槐混交林进行了种群竞争研究。结果表明，在调查样地中，杨树与刺槐混交较刺槐纯林最少能够提高单位面积木材蓄积量351 %。在杨树高优势度样地中，刺槐被压木比例高达641 %，刺槐单木平均胸径仅为杨树低优势度样地中的55 %。竞争分析显示，在杨树高优势度样地中，刺槐平均单木竞争强度高出杨树低优势度样地相应竞争强度的188 %。杨树高优势度样地中刺槐来自杨树种间竞争的强度占其总竞争强度的比例高达819 %，而在杨树低优势度样地中这一比例仅为355 %。此外，杨树重要值相近的两块样地出现较大的生长及竞争差异。
Abstract
In order to provide experiences for the construction of mixed forest, we conducted an investigation on a 12yearold Robinia pseudoacacia and Populus mixed forest based on 3 typical sample plots. Results showed that the volume of per hectare can be enhanced up to 35.1 % higher in the Populus and R. pseudoacacia mixed forest than that in monospecific R. pseudoacacia forest at least. The rate of suppressed tree of R. pseudoacacia in the sample plot with high dominance of Populus was as high as 64.1 %. The competition intensity of R. pseudoacacia in the sample plot with high dominance of Populus was 188 % higher than that of with low dominance of Populus on average. Moreover, the interspecific competition of R . pseudoacacia accounted for 81.9 % in the sample plot with high dominance of Populus. However, it was only 35.5 % in that with low dominance of Populus. In addition, the growth and competition situation was different although Populus important value was similar. The above results suggest that the Populus and R. pseudoacacia mixed forest growth modeling based on their spatial competition disciplinarian should be studied for healthier mixed forests.
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基金
收稿日期：2010-03-17修回日期：2010-07-01基金项目：“十一五”国家科技支撑计划 (2006BAD03A1403)作者简介：芮雯奕（1982—），博士。*张纪林（通信作者），研究员。Email: 8zjl8@163.com。
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