中间锦鸡儿的生长及生态化学计量学特征与基质稳定性关系初探  

The Relationship Between Shrub Growth and Stoichiometry Characteristics of C.davazamcii and the Stability of Soil Substrates

作　　者：张新军[1] 高玉葆[1] 

机构地区：[1]南开大学生命科学学院,天津300071

出　　处：《植物研究》2011年第2期180-187,共8页Bulletin of Botanical Research

基　　金：国家重点基础研究发展规划资助项目(2007CB106802)

摘　　要：选取半流动沙丘、半固定沙丘和丘间低地3种生境条件下的中间锦鸡儿为对象,研究了灌丛群落学特征、叶片化学计量学特征及其与土壤基质条件的关系。结果表明:(1)中间锦鸡儿灌丛在3种生境下的基质特征差异明显,半流动沙丘土壤相对贫瘠、土质疏松,半固定沙丘和丘间低地土壤紧实度较大;(2)灌丛当年枝长度、枝干重、叶干重以及叶干物质含量均与土壤紧实度呈显著负相关关系,而叶片N∶P及C∶P与土壤紧实度均呈显著正相关,但叶片C∶N与土壤紧实度的相关性并不显著;(3)中间锦鸡儿灌丛的灌幅、密度和盖度在不同沙丘生境间差异显著,这可能是由于土壤紧实度的差异引起的。土壤紧实度对中间锦鸡儿生长状况的影响不仅表现在地上生物量和当年枝生长量上,而且也表现在叶片C:N:P化学计量学特征以及叶片对营养物质的保持效率上。The community characteristics and leaf C, N and P stoichiometry of Caragana davazamcii Sancz in the semi-mobile dune area, semi-fixed dune area and inter-dune lowland in the Mu Us sandy land were studied. The soil substrates of different habitats as well as the relationship between plants characteristics and soil condi- tions were studied. We found three major results ： （ 1 ） The soil substrates of different habitats showed significant differences, i.e. the semi-mobile dune area had relatively poor and loose soil while the semi-fixed dune area and inter-dune lowland had relatively compact soil. （2） Length of current branches, weight of dry current branches, weight of dry leaves and leaf dry matter content were negatively correlated with the soil compaction, while leaf N ： P ratio and leaf C：P ratio were positively correlated with the soil compaction. There was no significant relation- ship between leaf C：N ratio and soil compaction. （3）The crown, density and coverage of C. davazamcii Sancz from different habitats showed significant differences, which might be caused by the differences of soil compac- tion. In one word, soil compaction influenced the growth status of C. davazamcii Sancz, not only by affecting the above ground biomass and length of current branches, but also affecting the leaf C, N and P stoichiometry and the efficiency of nutrient contents of leaf.

关 键 词：中间锦鸡儿 化学计量学 基质 土壤紧实度 

分 类 号：S793.3[农业科学—林木遗传育种]