天祝地区高寒草甸珠芽蓼草地土壤种子库季节动态与空间分布特征  

Seasonal dynamics and characteristics of the spatial distribution of a soil seed bank of a Polygonum viviparum meadow in an alpine area in the Tianzhu Region

作　　者：谈笑 陈莉[1] 龙玲[1] 王明明[1] 李春鸣[1] TAN Xiao;CHEN Li;LONG Ling;WANG Mingming;LI Chunming(College of Science and Engineering, Northwest Minzu University, Lanzhou 730030, Gansu, China)

机构地区：[1]西北民族大学生命科学与工程学院

出　　处：《草业科学》2019年第10期2485-2491,共7页Pratacultural Science

基　　金：国家自然科学基金(31960279、31560323、31360533、31560120);中央高校基本科研业务费专项资金(31920180133、1001050128)

摘　　要：通过野外调查和种子萌发法分析了天祝地区高寒草甸珠芽蓼(Polygonum viviparum)草地土壤种子库季节动态和空间分布特征。结果表明,在返青期取样的种子库中,平均单位体积(长1.0m×宽1.0m×高0.1m)有种子3479粒,在枯黄期取样的种子库中,有种子3871粒,在枯黄期取样的种子库总体数量多于在返青期取样的种子库数量,但差异不显著(P>0.05);无论是返青期还是枯黄期,土壤种子密度在0–5cm土层均高于5–10cm土层,且二者差异显著(P<0.05),不同取样时间同一土层种子密度差异不显著(P>0.05);土壤种子库物种丰富度、辛普森多样性指数、香农指数、均匀度指数均为返青期样品高于枯黄期样品,除了物种丰富度两者之间差异达到显著水平(P<0.05)外,辛普森多样性指数、香农指数、均匀度指数均为不显著(P>0.05);返青期样品由地面芽植物、地下芽植物和一年生植物3种植物生活型构成,枯黄期样品由地面芽植物和地下芽植物2种植物生活型构成;珠芽蓼草地土壤种子库与地上植被的物种组成相似性较低,返青期样品的Jaccard相似性指数和S.renson相似性指数低于枯黄期样品。The seasonal dynamics and characteristics of the spatial distribution of a soil seed bank of a Polygonum viviparum meadow in an alpine area in the Tianzhu region were studied through a field investigation and seed germination tests. The results indicated that for the soil seed bank during the turning green period, the density of average unit volume (length 1.0 m × width 1.0 m × height 0.1 m) is 3 479;whilst during the yellowing period,the density of average unit volume (1.0 m × 1.0 m × 0.1 m) was 3 871. The total numbers for the soil seed bank in the yellowing period were higher than in the turning green period, with a significant difference at the 0.05 level. The soil seed density at 0 – 5 cm was significantly higher than that at 5 – 10 cm in both the turning green and yellowing periods, with a significant differences (P < 0.05). However, there were no significant differences in the same soil seed density at different sampling times. The richness, simpson, shannon-wiener, and evenness indexes of the soil seed bank in the turning green period were all higher than those in the yellowing periods, except for, richness. The difference between the simpson, shannon-wiener, and evenness indexes was not significant. The difference between the richness was at the 0.05 level;The characteristics of the life forms present in a Polygonum viviparum meadow in the soil seed bank was: the sample from the turning green period was made up of Hemicryptophytes, Cryptophytes and Therophytes, whilst sample from the yellowing periods was made up of Hemicryptophytes and Cryptophytes;The similarity of the species composition between the soil seed bank and aboveground vegetation of a Polygonum viviparum meadow in an alpine area in Tianzhu was low, The jaccard similarity index and S?renson similarity index of the turning green period was lower than those of the yellowing periods.

关 键 词：高寒草甸 珠芽蓼草地 土壤种子库 季节动态 空间分布 

分 类 号：S812.2[农业科学—草业科学]