仁寿血防疫区人工种植益母草构型分支与生物量配置

本文研究了仁寿兴林抑螺示范区抑螺植物益母草的生长与结实特性。益母草存在基部优先与顶部优先两种构型,前者适应于肥沃生境,而后者适宜贫瘠生境。埂边生境高度较大(1.6 vs 0.95),分支数量较大(一级枝8.5vs 6.6;二级枝32.6 vs 9.7;三级枝:0.7 vs 0),分支率较高(4.7 vs 2.3),瘠薄的间作生境明显较低。两种生境中,个体高度与一级枝无关,而与二级枝数量呈现明显抛物线曲线关系。不同位置或节点枝径、间距长度、结实数量都呈现直线或曲线关系,表明位置效应明显,益母草呈现向基性发育模式。深入分析发现,益母草生殖枝结构性参数,如枝径、节间长度都与结实数量呈现明显的线性关系,暗示这种位置效应实质上是结构大小引起的,归为结构限制。随着个体生长,益母草枝干、根系、花果、叶片生物量增长速度依次降低,暗示培育目标实现可能需要优化构型特征。总体分析,益母草通过构型优化(如分支率)来适应异质性生境,而构件生殖存在结构依赖性。

Architecture Branching and Biomass Allocation of Leonurus spp.,an Annual grass Planted in the Epidemic Area of Schistosomiasis Prevention

In this paper,studies were made of the growth and fruit feature of Leonurus spp.,a snail control species planted in the Snail Control Afforestation pilot area of Renshou County.Leonurus spp.had two types of architecture:acrotony and basitony,the former adapted to the fertile habitat and the latter to the poor.There were greater height(1.6 vs 0.95),more branches(the first branch:8.5 vs 6.6;the second:32.6 vs 9.7;the third:0.7 vs 0),taller bifurcation ratio(4.7 vs 2.3) of Leonurus individuals in the ridges between fields than in the poor intercrop stand.In the two habitats,individual height was not related to branches of the first class and had a significant relation to the amount of the second class branches with a paullic curve.The branch diameter,inter-node length,and fruiting amount in different position or nodes all showed an obvious relation of paullic curve,indicating a significant position effect and with a develop pattern of baisitony in Leonurus spp.planted in this site.After analyzis,it was found that the architecture parameters of reproductive branches as diameter near node and inter-node length both had an obvious linear relationship with the fruit amount of this node,implying that this position effect was brought about by the architecture size,and attributed to the architecture limitation.With the individual growth,the calculated ratio for biomass of branch stem,root,fruits and leaves took a decreasing order,implying that the accomplishment of the cultivation aim could require the optimal architecture feature.On the whole,the growth of Leonurus individuals adapted to the heterogeneous habitat through the bifurcation ratio,and its modular reproduction had a dependency of architecture.