摘要
以青藏高原和四川盆地过渡带两种不同分枝型匍匐茎植物野草莓 (Fragaria vesca)和过路黄 (Lysimachia christinae)为对象 ,研究它们在高光照低养分斑块和低光照高养分斑块组成的资源交互斑块性生境中的克隆内分工。结果显示 ,与资源的空间同质性处理 (I)和 (II)相比 ,资源的空间异质性处理 (III)和 (IV)中野草莓和过落黄的近端、远端和整个克隆片段的生物量和分株数均获得显著增加。生长在低光高养条件下的远端分株 ,若与高光低养的近端分株相连 ,相比连接到低光高养的近端分株 ,它们分配更多的生物量到地下部分 ;生长在高光低养条件下的远端分株 ,若与低光高养的近端分株相连 ,相比连接到高光低养的近端分株 ,它们分配更多的生物量到地上部分 ;生长在高光低养条件下的近端分株 ,若与低光高养的远端分株相连 ,相比连接到高光低养的远端分株 ,它们分配更多的生物量到地上部分。实验结果表明 ,资源交互斑块性生境中野草莓和过路黄均发生了克隆内分工。通过克隆内分工 ,克隆植物能有效的利用异质性分布的资源 。
Plants’ environments with reciprocal patchiness of resources, in which the availability of two resources such as light and soil nutrients are patchily distributed in horizontal space and negatively corrected in each patch, are common in many ecosystems. Intraclonal spatial division of labour of Fragaria vesca and Lysimachia christinae with different branching type, growing in the transitional belt between the Qing-zang Plateau and the Sichuan Basin, Southwest China, was investigated in response to the reciprocal patchiness of resources. The results indicate that biomass and number of ramets in the proximal clonal part, the disdtal clonal part and whole clonal fragment significantly increased in the resource heterogeneity treatments (III, IV ), compared with in resources homogeneity treatments (I,II). The distal ramets growing in the treatment with low light and high nutrient allocated more biomass to the below～ground as connected to the proximal ramets growing in high light and low nutrient than as connected to the proximal ramets growing in low light and high nutrient. The distal ramets growing in the treatment with high light and low nutrient allocated more biomass to the above-ground as connected to the proximal ramets growing in low light and high nutrient than as connected to the proximal ramets growing in high light and low nutrient. The proximal ramets growing in the treatment with high light and low nutrient allocated more biomass to the above-ground as connected to the distal ramets growing in low light and high nutrient than as connected to the distal ramets growing in high light and low nutrient. By intraclonal spatial division of labour, clonal plants, such as F. vesca and L. christinae, may be able to exploit heterogeneous resources supply efficiently and mitigate the stress caused by reciprocal patchiness of resources.
出处
《生态学报》
CAS
CSCD
北大核心
2004年第5期920-924,共5页
Acta Ecologica Sinica
基金
国家重点基础研究发展规划项目 ( G2 0 0 0 0 4680 4)
国家杰出青年科学基金资助项目 ( 3 982 5 10 6)
国家自然科学基金资助项目( 3 0 0 70 13 8)~~
关键词
克隆植物
野草莓
过路黄
资源交互斑块性
克隆内分工
clonal plants
Fragaria vesca
intraclonal spatial division of labour
Lysimachia christinae
reciprocal patchiness of resources
