内蒙古锡林郭勒盟草原区三种针茅群落动态研究
发布时间：2018-07-28 14:46
【摘要】：草地生态系统是地球上分布较广的类型之一,内蒙古草原是我国北方的天然生态屏障,其中锡林郭勒盟草原区为内蒙古草原主要的天然草原之一。本文通过对内蒙古锡林郭勒盟草原区三种针茅群落,包括克氏针茅(Stipa krylovii)群落、大针茅(Stipa grandis)群落和贝加尔针茅(Stipa Baicalensis)群落2009-2013年连续5年的监测分析,得到以下结果：1.在克氏针茅群落,一、二年生植物对夏季降水较敏感,在丰水年份,会对丛生禾草的生长产生部分抑制作用。对于大针茅群落和贝加尔针茅群落没有这样的情况。2.5年间,贝加尔针茅群落物种丰富度最大,克氏针茅群落次之,大针茅群落物种丰富度最低；克氏针茅群落Shannon-wienner指数和Pielou均匀度指数连续5年均较平稳。大针茅群落除个别年份外Shannon-wienner指数,Simpson指数和Pielou指数均较低。贝加尔针茅群落Shannon-wienner指数,Simpson指数和Pielou指数2013年均下降明显。3.影响三种针茅群落Pielou均匀度指数的主要植物种是羊草,无论是羊草的相对密度还是相对生物量,与Pielou均匀度指数均有负相关关系,与克氏针茅群落和贝加尔针茅群落极显著负相关(p0.01),与大针茅群落显著负相关(p0.05)。4.克氏针茅群落地上生物量与年降水量极显著正相关(p0.01),与年均温极显著负相关(p0.01)；大针茅群落和贝加尔针茅群落的相关关系不显著(p0.1)。5.2009-2012年三种针茅群落地上生物量均与Shannon-Wiener指数极显著正相关(p0.01)。6.克氏针茅群落物种丰富度与年降水量显著正相关(p0.05),与年均温极显著负相关(p0.01)；大针茅群落物种丰富度与年降水量和年均温均达不到显著相关关系(p0.1)；贝加尔针茅群落物种丰富度与年降水量显著正相关(p0.05),与年均温极显著负相关(p0.01)。
[Abstract]:Grassland ecosystem is one of the most widely distributed types on the earth. Inner Mongolia steppe is the natural ecological barrier in the north of China, and the Xilingol League grassland is one of the main natural steppes in Inner Mongolia grassland. In this paper, through monitoring and analysis of three Stipa species communities in Xilingol League, Inner Mongolia, including (Stipa krylovii) community, (Stipa grandis) community and (Stipa Baicalensis) community in 2009-2013, the following results were obtained: 1: 1. In Stipa krjabini community, first, biennial plants are more sensitive to summer precipitation, and in high water years, they can partly inhibit the growth of herbaceous grasses. There was no such situation for Stipa grandis community and Stipa bajalensis community. During the period of 2.5, the species richness of Stipa bicarboides community was the largest, followed by Stipa krjabini community, and the species richness of Stipa grandis community was the lowest. The Shannon-wienner index and Pielou evenness index of Stipa kristii community were stable for 5 consecutive years. The Shannon-wienner index and Pielou index of Stipa grandis community were lower except in some years. The Shannon-wienner index and Pielou index of Stipa baicalensis community decreased significantly in 2013. The main plant species affecting the Pielou evenness index of three Stipa species was Leymus chinensis. The relative density and biomass of Leymus chinensis were negatively correlated with the Pielou evenness index. There was a significant negative correlation with Stipa krjabini community and Stipa bicarboides community (p0.01), and significant negative correlation with Stipa krjabini community (p0.05) .4. The aboveground biomass of Stipa krjabini community was significantly positively correlated with annual precipitation (p0.01) and negatively correlated with annual mean temperature (p0.01). The correlation between Stipa grandis community and Stipa bajalensis community was not significant (p 0.1). 5. The aboveground biomass of the three species of Stipa arundinacea community was significantly and positively correlated with the Shannon-Wiener index (p0.01) .6 from 2009 to 2012. Species richness was positively correlated with annual precipitation (p0.05), negatively correlated with annual mean temperature (p0.01), and had no significant correlation with annual precipitation and annual mean temperature (p0.1). The species richness of Stipa baicalensis community was positively correlated with annual precipitation (p0.05) and negatively correlated with annual mean temperature (p0.01).
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812
[Abstract]:Grassland ecosystem is one of the most widely distributed types on the earth. Inner Mongolia steppe is the natural ecological barrier in the north of China, and the Xilingol League grassland is one of the main natural steppes in Inner Mongolia grassland. In this paper, through monitoring and analysis of three Stipa species communities in Xilingol League, Inner Mongolia, including (Stipa krylovii) community, (Stipa grandis) community and (Stipa Baicalensis) community in 2009-2013, the following results were obtained: 1: 1. In Stipa krjabini community, first, biennial plants are more sensitive to summer precipitation, and in high water years, they can partly inhibit the growth of herbaceous grasses. There was no such situation for Stipa grandis community and Stipa bajalensis community. During the period of 2.5, the species richness of Stipa bicarboides community was the largest, followed by Stipa krjabini community, and the species richness of Stipa grandis community was the lowest. The Shannon-wienner index and Pielou evenness index of Stipa kristii community were stable for 5 consecutive years. The Shannon-wienner index and Pielou index of Stipa grandis community were lower except in some years. The Shannon-wienner index and Pielou index of Stipa baicalensis community decreased significantly in 2013. The main plant species affecting the Pielou evenness index of three Stipa species was Leymus chinensis. The relative density and biomass of Leymus chinensis were negatively correlated with the Pielou evenness index. There was a significant negative correlation with Stipa krjabini community and Stipa bicarboides community (p0.01), and significant negative correlation with Stipa krjabini community (p0.05) .4. The aboveground biomass of Stipa krjabini community was significantly positively correlated with annual precipitation (p0.01) and negatively correlated with annual mean temperature (p0.01). The correlation between Stipa grandis community and Stipa bajalensis community was not significant (p 0.1). 5. The aboveground biomass of the three species of Stipa arundinacea community was significantly and positively correlated with the Shannon-Wiener index (p0.01) .6 from 2009 to 2012. Species richness was positively correlated with annual precipitation (p0.05), negatively correlated with annual mean temperature (p0.01), and had no significant correlation with annual precipitation and annual mean temperature (p0.1). The species richness of Stipa baicalensis community was positively correlated with annual precipitation (p0.05) and negatively correlated with annual mean temperature (p0.01).
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812
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