高寒草地优势植物垂穗披碱草对狼毒种苗定居的影响

Effect of dominant plant (Elymus nutans) on the settlement of Stellera chamaejasme seedlings in alpine grassland

摘要:

【目的】明晰狼毒(Stellera chamaejasme)与垂穗披碱草(Elymus nutans)间的相互作用,探明垂穗披碱草对狼毒种苗定居的影响。【方法】在原生境下开展人工控制试验,测定狼毒和垂穗披碱草种子在不同生境(狼毒定居区、非定居区)来源土壤和播种方式(单播、混播)下的出苗和幼苗定居表现。【结果】垂穗披碱草对狼毒非定居区土壤中狼毒种子出苗率无显著影响,而显著提高了狼毒定居区土壤中狼毒种子出苗率(P<0.05)。此外,垂穗披碱草在两种不同生境来源土壤中均不同程度地降低了狼毒种子成苗率,抑制了狼毒幼苗的生长。【结论】草地优势植物(垂穗披碱草)有利于狼毒种子在狼毒定居区土壤中出苗,但不利于狼毒种苗存活和生长。

Abstract:

【Objective】This study aimed to investigate the interaction between Stellera chamaejasme and Elymus nutans and to determine the impact of E. nutans on the seedling establishment of S. chamaejasme.【Method】Artificial control experiments were conducted in the native habitat to examine the seedling emergence and establishment performance of S. chamaejasme and E. nutans seeds across different habitats (S. chamaejasme settlement and non-settlement area) and under different sowing methods (pure sowing and mixed sowing).【Result】In the soil from the non-settlement soil,E. nutans had no significant effect on the emergence rate of S. chamaejasme seeds. However,in the soil from the settlement soil,E. nutans significantly increased the seed emergence rate of S. chamaejasme seeds (P<0.05). Furthermore,E. nutans reduced the seedling establishment rate of S. chamaejasme seeds and inhibited the growth of S. chamaejasme seedlings in both habitats.【Conclusion】The dominant plant in grassland,E. nutans facilitates the emergence of S. chamaejasme seeds in the soil of S. chamaejasme settlement area. However,it is not conducive to the subsequent survival and growth of S. chamaejasme seedlings.