民勤绿洲边缘沙拐枣群落分布与土壤理化因子关系研究

Study on Relationship Between the Distributions of Calligonum mongolicum Communities and Soil Physical and Chemical Properties in the Edge of Minqin Oasis

在全球气候和土地利用变化背景下,及时了解植被和土壤环境在特定区域的关系有助于预测植被群落的演替变化。在野外调查取样与室内分析的基础上,采用经典统计学和冗余分析的方法,研究了民勤绿洲边缘沙拐枣群落空间分布与土壤理化性质的相互关系。结果表明:民勤绿洲边缘沙拐枣群落出现14种植物,分属7科14属,物种组成贫乏,科属组成较为分散,结构简单。除了p H和电导率之外,沙拐枣群落土壤其他因子在各样带之间差异不显著。整体上看,沙拐枣群落生境土壤水分条件差,养分贫瘠,以粗化呈弱碱性的风沙土为主。冗余分析表明,电导率和p H对沙拐枣群落空间分布有显著的影响。沙拐枣是干旱区优良的固沙造林树种,建议在选择造林地时要考虑土壤盐碱性的影响。

In the background of global climate and land use change, understanding of the relationship betweenvegetation and soil environment timely is useful to predict the succession change of vegetation communities.Based on field survey and laboratory analysis, the relationship between C. mongolicum communities＇ spatialdistribution and soil physical and chemical properties in the edge of Minqin Oasis was studied with themethods of traditional statistical and redundancy analysis（RDA）. The results showed that there were only 14 plant species which belonged to 7 families and 14 genera in the study area. The species composition andstructure of C. mongolicum communities were poor and simple. Water and nutrient condition of C. mongolicum communities was poor, mainly was coarsening and weakly alkaline sandy soil. The RDA results showed that p Hand EC had significant influence on the distribution of C. mongolicum communities. As an important sand-fixation afforestation variety, the author suggested that soil salinity should be given more consideration whenchoosing planting site.