松嫩草原藻结皮与种子植物的关系
发布时间：2018-07-27 19:20
【摘要】：松嫩草原是我国畜牧业发展的重要区域之一,近些年来受人为干扰影响,草场退化日益严重。在松嫩草原广泛分布的蓝藻结皮,因具有重要生态功能而备受关注。本文以松嫩羊草草原广泛分布的羊草(Leymus chinensis)群落、星星草(Puccinellia tenuiflora)群落、虎尾草(Chloris virgata)群落、碱蒿(Artemisia anethifolia)群落、角碱蓬(Suaeda corniculata)群落以及群落下生长的蓝藻结皮、碱斑环境下的藻结皮为研究对象,重点研究种子植物对藻结皮中蓝藻种类组成的影响,藻结皮对种子植物定居、生长的影响,并探究其机理。研究内容包括以下几个方面:松嫩羊草草原不同植物群落类型覆盖下藻结皮中蓝藻种类组成鉴定;通过野外调查及室内模拟研究藻结皮对种子植物定居及其生长的影响;蓝藻结皮化感液对种子萌发的影响。本次研究结果表明:不同地上植物群落类型覆盖下生长的藻结皮中蓝藻种类共34种,属于8科11属。具鞘微鞘藻(Microcoleus vaginatus)为广布种和优势种。不同种类种子植物群落覆盖下生长的藻结皮中蓝藻种类组成差别较大;自然条件下,藻结皮的存在抑制多年生植物羊草、星星草的定居,而有利于一年生植物碱蒿、虎尾草、角碱蓬的定居,分析原因与结皮影响土壤表面对种子的捕获能力有关。结皮存在增加土壤养分,有利于种子植物生长;通过室内模拟实验证明结皮的存在抑制种子植物种子的出苗,但结皮对植株株高、光合色素含量、生物量具有促进作用;不同植物群落类型下生长的藻结皮的化感液对不同种植物种子的发芽率影响不同,多数促进种子植物株高生长(角碱蓬除外),并有利于生物量的积累(星星草、虎尾草除外)。本次研究探讨了松嫩草原藻结皮与种子植物之间的关系,对草原生态系统中藻结皮生态功能的研究具有理论意义。
[Abstract]:Songnen grassland is one of the most important areas in the development of animal husbandry in China. Cyanobacteria crusts, which are widely distributed in Songnen grassland, have attracted much attention because of their important ecological functions. In this paper, (Leymus chinensis) community, (Puccinellia tenuiflora) community, (Chloris virgata) community, (Artemisia anethifolia) community, (Suaeda corniculata) community and cyanobacteria crusts of Leymus chinensis were widely distributed in Leymus chinensis grassland. The effect of seed plants on the species composition of cyanobacteria in algal crust, the effect of algal crust on the settlement and growth of seed plants, and its mechanism were studied. The contents of the study include the following aspects: identification of cyanobacteria species in algal crust covered by different plant community types of Leymus Songnen Leymus chinensis grassland the effects of algal crust on settlement and growth of seed plants were studied through field investigation and laboratory simulation. Effect of cyanobacteria allelopathy on seed germination. The results showed that there were 34 species of cyanobacteria growing under different aboveground plant community types, belonging to 8 families, 11 genera. (Microcoleus vaginatus) is a widespread and dominant species. The species composition of cyanobacteria in the algal crust grown under the cover of different species of seed plant communities is quite different. Under natural conditions, the existence of algal crust inhibits the settlement of perennial plant Leymus chinensis and puccinellia tenuifolia, but is beneficial to annual plant alkaloids and Saxifraga. The settlement of Suaeda salsa was related to the effect of crust on the seed capture ability of soil surface. The results of laboratory simulation showed that the presence of crust could inhibit the emergence of seed plants, but it could promote plant height, photosynthetic pigment content and biomass. The allelopathic solution of algal bark grown under different plant community types had different effects on the germination rate of different plant seeds. Most of them promoted the growth of plant height (except Suaeda salsa) and the accumulation of biomass (except puccinellia and Saxifraga). In this study, the relationship between algal crust and seed plants in Songnen grassland was discussed, which was of theoretical significance to the study of the ecological function of algal crust in grassland ecosystem.
【学位授予单位】：东北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812
本文编号：2148889
[Abstract]:Songnen grassland is one of the most important areas in the development of animal husbandry in China. Cyanobacteria crusts, which are widely distributed in Songnen grassland, have attracted much attention because of their important ecological functions. In this paper, (Leymus chinensis) community, (Puccinellia tenuiflora) community, (Chloris virgata) community, (Artemisia anethifolia) community, (Suaeda corniculata) community and cyanobacteria crusts of Leymus chinensis were widely distributed in Leymus chinensis grassland. The effect of seed plants on the species composition of cyanobacteria in algal crust, the effect of algal crust on the settlement and growth of seed plants, and its mechanism were studied. The contents of the study include the following aspects: identification of cyanobacteria species in algal crust covered by different plant community types of Leymus Songnen Leymus chinensis grassland the effects of algal crust on settlement and growth of seed plants were studied through field investigation and laboratory simulation. Effect of cyanobacteria allelopathy on seed germination. The results showed that there were 34 species of cyanobacteria growing under different aboveground plant community types, belonging to 8 families, 11 genera. (Microcoleus vaginatus) is a widespread and dominant species. The species composition of cyanobacteria in the algal crust grown under the cover of different species of seed plant communities is quite different. Under natural conditions, the existence of algal crust inhibits the settlement of perennial plant Leymus chinensis and puccinellia tenuifolia, but is beneficial to annual plant alkaloids and Saxifraga. The settlement of Suaeda salsa was related to the effect of crust on the seed capture ability of soil surface. The results of laboratory simulation showed that the presence of crust could inhibit the emergence of seed plants, but it could promote plant height, photosynthetic pigment content and biomass. The allelopathic solution of algal bark grown under different plant community types had different effects on the germination rate of different plant seeds. Most of them promoted the growth of plant height (except Suaeda salsa) and the accumulation of biomass (except puccinellia and Saxifraga). In this study, the relationship between algal crust and seed plants in Songnen grassland was discussed, which was of theoretical significance to the study of the ecological function of algal crust in grassland ecosystem.
【学位授予单位】：东北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812
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