准噶尔盆地梭梭土壤种子库基本特征

发布时间：2018-10-25 10:56

【摘要】：土壤种子库是种子的安全岛,是干旱荒漠区植被更新与恢复的基础。以梭梭为主的荒漠植被是准噶尔盆地绿洲区重要的生态屏障,但是,对于与梭梭种群自然更新紧密联系的土壤种子库特征的研究却相对缺乏。本研究通过野外采样、物理筛分并结合室内实验分析,对准噶尔盆地梭梭土壤种子库基本特征进行了研究。结果表明:(1)梭梭种群平均土壤种子库密度从71~696粒·m~(-2),局部小环境甚至达到7 534粒·m~(-2);(2)变异系数分析表明,各种群土壤种子库密度变异系数均大于1,说明梭梭土壤种子库的数量分布是非常不均匀的;(3)梭梭种群土壤种子库中种子萌发率从2.08%到47.62%不等,平均约18%;(4)变异函数分析表明,梭梭土壤种子库中种子分布的空间变异较大。综上,准噶尔盆地梭梭土壤种子库密度大且种子萌发能力强,同时其时空分布差异明显,这些特征均将影响梭梭种群的分布格局和种群更新。
[Abstract]:Soil seed bank is the safe island of seeds and the basis of vegetation regeneration and restoration in arid desert areas. The desert vegetation dominated by Haloxylon ammodendron is an important ecological barrier in the oasis area of Junggar Basin, but the study on the characteristics of soil seed bank which is closely related to the natural regeneration of Haloxylon ammodendron population is relatively lacking. In this study, the basic characteristics of soil seed bank of Haloxylon ammodendron in Junggar Basin were studied by field sampling, physical screening and laboratory experiment. The results showed that: (1) the average soil seed bank density of Haloxylon ammodendron population ranged from 71 ~ (-1) to 696 (m ~ (-2), and even to 7 534 (m ~ (-2); (~ (-2) in local environment. The density variation coefficient of soil seed bank of various groups was greater than 1, which indicated that the quantity distribution of soil seed bank of Haloxylon ammodendron was very uneven, (3) the seed germination rate of soil seed bank of Haloxylon ammodendron population ranged from 2.08% to 47.62%, with an average of 18.8%; (4) the analysis of variation function showed that, The spatial variation of seed distribution in soil seed bank of Haloxylon ammodendron was significant. In summary, the soil seed bank density and seed germination ability of Haloxylon ammodendron in Junggar Basin were high, and the spatial and temporal distribution of the seed was obviously different. These characteristics would affect the distribution pattern and population regeneration of Haloxylon ammodendron population.
【作者单位】：遵义师范学院生物与农业科技学院;中国科学院新疆生态与地理研究所;遵义师范学院资源与环境学院;
【基金】：贵州省教育厅自然科学基金项目(黔教合KY字[2015]409号) 遵义师范学院博士启动基金项目(遵师BS[2014]17号) 国家自然科学基金项目(30870472) 贵州省高层次创新人才培养项目(遵市科合人才[2016]3号)~~
【分类号】：S714

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