Abstract:

In the study, Zoysia japonica was planted in the five kinds of soil substrates in August and was treated with five shade gradients (0, 15%, 30%, 45%, 60%) in mid-November, respectively. Some index of seedling, including survival rate, growth characteristics, component traits and biomass, were measured. The purpose was to analyze the effect of soil substrate and shade on the seedling components and biomass allocation of Z. japonica in the winter. The results showed that:All of the soil substrates had a highly significant influence on the survival rate, dry weight, fresh weight and biomass allocation. The order of soil substrate conducive to Z. japonica survival and growth in the winter was mature purple soil > residual soil after construction > coarse sand soil > stony soil > humus soil; Shade degree had a highly significant influence on the survival rate. And 30% shade degree was beneficial to the survival and growth of Z. japonica in the winter; The interaction effect of soil substrate and shade degree had a significant influence on the seedlings component traits and biomass allocation, as soil substrate was the main factor followed by shade degree; Under synergistic effect of soil substrate and shade degree,the influence level of component biomass allocation of Z. japonica was ranged as leaf > root > stem. Therefore, we concluded that Z. japonica could improve the adaptation and cold resistance by adopting corresponding morphological plasticity and growth strategy based on its soil substrate and shade degree.

Key words: Zoysia japonica, Growth in the winter, Substrate, Shade degree, Synergistic effect

摘要：

通过设置5种基质和5个遮阴梯度，对结缕草（Zoysia japonica）扦插苗进行交叉处理，经3个月的冷季生长后，测定幼苗的存活率、生长特性、构件性状及生物量等指标，分析基质和遮阴对冷季生长结缕草幼苗构件性状及生物量分配的影响。结果表明：基质对结缕草存活率、干重、鲜重及生物量分配均有极显著影响，利于结缕草冷季存活与生长的基质顺序为成熟紫色土 > 建渣土 > 粗砂土 > 石谷子土 > 腐殖土；遮阴度对结缕草存活率有极显著影响，30%左右遮阴利于结缕草在冷季存活与生长；基质和遮阴度互作对结缕草幼苗构件性状及生物量分配有显著影响，基质是影响主要因子，遮阴度次之；基质和遮阴协同作用对结缕草构件生物量分配影响为叶 > 根 > 茎，结缕草可依据基质和遮阴采取相应的形态塑性和生长策略，以提高适应性和抗寒性。

关键词: 结缕草, 冷季生长, 基质, 遮阴, 协同作用