Abstract:

A pot experiment with three levels of nutrient (N, P, K) supply was carried out to investigate clonal plasticity of stoloniferous herb Duchesnea indica Focke in response to nutrient availability. The plants had greater biomass at higher levels of nutrient availability. The root/shoot ratio of the plants changed with the nutrient availability in the following order: low level > high level > medium level. They had the largest biomass allocation to stolon at the medium level of nutrient availability. The biomass allocation to petiole did not respond to the treatments. The plants formed more stolons and ramets at the high and medium levels than the low level of nutrient availability. The petiole length, specific petiole weight（mg/cm）and stolon internode length of the plants did not respond to the treatments, while the specific stolon weight (mg/cm）of the plants was greater at the high and medium levels than the low level of nutrient availability. The results have been discussed in the context of adaptation of clonal plants to environmental heterogeneity.

匍匐茎草本蛇莓对基质养分条件的克隆可塑性
董鸣 张淑敏 陈玉福
（中国科学院植物研究所植被数量生态学开放研究实验室，北京100093）

摘要：为了研究匍匐茎草本植物对基质养分供应水平的克隆可塑性 ,在一栽培实验中匍匐茎草本植物蛇莓(Duchesneaindica Focke)经历了高、中、低养分 (N ,P ,K)水平的环境处理。实验表明 ,蛇莓植株生物量在较高养分条件下较大 ,根冠比在低养分条件下最大 ,高养分次之 ,中养分最小 ;对匍匐茎的生物量投资在中养分条件下最大 ;对叶柄的生物量投资没有对养分处理发生反应。蛇莓植株在低养分下比在高养分和中养分条件下形成较少的匍匐茎和克隆分株。蛇莓植物的叶柄长度、单位长度叶柄重量 (mg·cm-1)和匍匐茎节间长度都没有对养分处理发生反应 ,单位长度匍匐茎重量 (mg·cm-1)在低养分条件下较小。结合克隆植物对环境异质性的生态适应意义对实验结果进行了讨论。

关键词： 蛇莓；克隆植物；匍匐茎；养分；可塑性

Key words: clonal plant, Duchesnea indica , stolon, nutrients, plasticity