亚热带红壤侵蚀退化区不同恢复水平生境内先锋树种竞争特征
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摘要
以亚热带红壤侵蚀退化区先锋树种马尾松(Pinus massionana Lamb.)和木荷(Schima superba Gardn. et Champ)为研究对象,设置4个不同恢复水平样地,构建Voronoi图确定林木生长空间和邻近竞争木,采用V_Hegyi竞争指数定量分析亚热带红壤丘陵生态恢复早期不同生境恢复阶段先锋树种竞争特征.结果显示:对象木个体竞争强度与其胸径服从幂函数关系(CI=AD~B);随着个体胸径的增大,个体受到的竞争压力逐渐减弱.林木竞争结构和竞争强度在不同样地间具有显著差异(P <0.005),其全林分个体平均竞争强度依次为中等恢复水平样地(3.839 63)>强度侵蚀水平样地(2.315 83)>阔叶树进入样地(2.019 12)>较高恢复水平样地(1.084 75).本研究表明从马尾松占优势的针叶林阶段向针阔混交阶段的生态过程中,林木竞争指数呈现先升后降的趋势,竞争在驱动群落发生演替的同时又受到群落结构变化和个体生长状况的影响而不断调整;因此针对不同生境恢复水平应采取相应措施,以减小竞争对生境恢复带来的不利影响.(图3表4参39)
The pioneer species Pinus massionana and Schima superba were studied in four sample plots with different restoration levels in the subtropical red soil hill region. The competition patterns of the pioneer species were analyzed at different restoration levels during the early restoration period in the subtropical red soil hill region. A Voronoi diagram was constructed and used to determine the growth space of stems and adjacent competitive trees. The relation between the individual competitive intensity and DBH(diameter at breast height) is defined by the power function CI = AD~B; the competitive intensity decreased with increased DBH(P <0.005). The average individual competition intensity of our plot was in line with medium recovery level(3.839 63), strong erosion level(2.315 83), level of Pinus massionana and Sichima superba mixed forest(2.019 12) and high recovery level(1.084 75). This study showed that from the coniferous forest stage dominated by P. massionana to the ecological process of coniferous and broad-leaf mixed stage, the forest competition index showed a trend of rising first and then decreasing, and competition was driven by community succession, constantly adjusted with the effects of individual growth conditions. Therefore, measures should be taken to reduce the adverse effects of competition on habitat restoration of different habitats.
The pioneer species Pinus massionana and Schima superba were studied in four sample plots with different restoration levels in the subtropical red soil hill region. The competition patterns of the pioneer species were analyzed at different restoration levels during the early restoration period in the subtropical red soil hill region. A Voronoi diagram was constructed and used to determine the growth space of stems and adjacent competitive trees. The relation between the individual competitive intensity and DBH(diameter at breast height) is defined by the power function CI = AD~B; the competitive intensity decreased with increased DBH(P <0.005). The average individual competition intensity of our plot was in line with medium recovery level(3.839 63), strong erosion level(2.315 83), level of Pinus massionana and Sichima superba mixed forest(2.019 12) and high recovery level(1.084 75). This study showed that from the coniferous forest stage dominated by P. massionana to the ecological process of coniferous and broad-leaf mixed stage, the forest competition index showed a trend of rising first and then decreasing, and competition was driven by community succession, constantly adjusted with the effects of individual growth conditions. Therefore, measures should be taken to reduce the adverse effects of competition on habitat restoration of different habitats.
引文
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15张泽浦,方精云,菅诚.邻体竞争对植物个体生长速率和死亡概率的影响:基于日本落叶松种群试验的研究[J].植物生态学报,2000,24(3):340-345[Zhang ZP,Fang JY,Kan M.Effects of competition on growth rate and probability of death of plant individuals a study based on nursery experiments of leptolepis populations[J].Acta Phytoecol Sin,2000,24(3):340-345]
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17 Anazawa M.Interplay between habitat subdivision and minimum resource requirement in two-species competition[J].Theor Population Biol,2018,120:90-102
18张炜平,潘莎,贾昕,储诚进,肖洒,林玥,白燕远,王根轩.植物间正相互作用对种群动态和群落结构的影响:基于个体模型的研究进展[J].植物生态学报,2013,37(6):571-582[Zhang WP,Pan S,Zhu CJ,Xiao S,Lin Y,Bai YY,Wang GX.Effects of positive plant interactions on population dynamics and community structures:a review based on individual-based simulation models[J].Acta Phytoecol Sin,2013,37(6):571-582]
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