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Species Distribution and Characteristics are Highly Reiated to Soil Gradient in Songnen Plain

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Soil salinization is a worldwide problem and around 954 million hectares ofland are already salinized. Songnen grassland is an important product baseof animals and crops. However, approximate 70％ of the nature grasslanddegraded due to improper land use, especially salt-alkalined problem. Thisresearch was carried out in Songnen meadow steppe to test how soil saltgradient can influence species distribution and characteristics during growthseason (July-August 2009). Three representative heterogeneity patches with three lines were selectedbased on species appearance and proportion, each divided into differentsections. Thus, the sites A and B were divided into three sections and thebottom section represented the center of site, the middle and top sections.The site C has been divided into four sections with two middle sections. Thecenter part is defined as bottom section, where dominant species, and themiddle and outer edge parts were defined as the middle and top sections,and dominant species were Chloris virgata, Phragmites cornmunis, Leymuschinensis respectively. Our results showed salinity had significant effects on plant abovegroundbiomass, species relative biomass, solute organic content (chlorophyll andproline), soil nitrogen and soil organic matter. Aboveground biomassincreased significantly from the bottom to top section (p≤0.05) and speciesappeared to benefit from interspecific neighbors. Kochia scoporia decreasedsignificantly from section B by about 95％ to less than 20％ in section T.Chloris virgata, Phragmites communis, and Leymus chinensis increased byabout 10％, 5％, and 20％ from section B to more than 20％, 80％ and 50％in section T respectively. Kochia scoporia can survive at 90％ to high salinity.Chlorophyll and proline content increased proportionally to biomass, but didnot seem to be related to salt stress in this study. Both soil nitrogen and soilorganic matter increased significantly with the aboveground biomass increasing. In conclusion, plant organic solutes (e.g. chlorophyll and proline) are notrelated to species salt tolerance ability, other plant organic solutes, likecarbohydrate and its components may be related to plant salt toleranceability. Further study is needed to go to this direction.

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作者
Mr.Diabate Baba;
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作者单位

东北师范大学;

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授予单位东北师范大学;
学科 Ecology
授予学位硕士
导师姓名高英志;
年度 2010
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原文格式 PDF
正文语种英文
中图分类土壤-植物系统;
关键词
dominant species; species distribution; Leymus chinensis; proline content; salt tolerance; soil nitrogen; meadow steppe; salt stress; land use;

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Species Distribution and Characteristics are Highly Reiated to Soil Gradient in Songnen Plain

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