干旱区生态环境知识资源中心(Arid): 科尔沁沙地恢复过程中地上定植群落与土壤种子库特征及其关系研究

Arid

	科尔沁沙地恢复过程中地上定植群落与土壤种子库特征及其关系研究
其他题名	Relationship between Soil Seed Banks Characteristics and Aboveground Colonization Community along Natural Restoration Gradients in Horqin Sandy Land
	赵丽娅; 李元哲; 陈红兵; 张劲; 张晓雨
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2018
卷号	27 期号:2 页码:199-208
中文摘要	选择科尔沁沙地固定沙地、半流动沙地和流动沙地样地,研究沙地恢复过程中土壤种子库密度、组成及其与地上植被的关系。结果表明,(1)退化沙地恢复过程中,流动沙地、半流动沙地、固定沙地的土壤种子库平均密度(以单位面积有效种子数量表示,ind·m~(-2))分别为814、3 125和16 294 ind·m~(-2)。土壤种子库物种组成以一年生草本为主,多年生植物和灌木类所占的比例小。(2)地上定植群落与土壤种子库的变化趋势一致,地上定植群落的平均密度分别为68、242和673 plant· m~(-2)。地上定植群落物种组成也以一年生植物为主,但所占比例较土壤种子库有所下降。(3)不管是土壤种子库还是地上定植群落,Shannon-Wiener指数、Simpson指数、均匀度指数和丰富度指数大小顺序均为:固定沙地>半固定沙地>流动沙地,土壤种子库物种多样性指数均大于地上植被。(4)地上植被与土壤种子库组成上的相似性系数在0.333~0.739之间,相似性系数较高。地上定植群落与土壤种子库密度存在显著的正相关关系。流动沙地、半流动沙地、固定沙地地上植被密度分别有36%、52%、60%的变异可归结为土壤种子库密度的变异。科尔沁沙地土壤种子库是地上植被自然恢复的重要物质基础,土壤种子库中的大量种子,在植被自然恢复中将发挥积极的作用。
英文摘要	Soil seed banks play prominent ecological and evolutionary roles linking past, present and future plant population and community structure and dynamics. They are important contributors in conservation and vegetation regeneration in arid regions. Our objective was to determine the characteristics of soil seed banks and their relationships with aboveground vegetation in sandy lands along natural restoration gradients in Horqin Sandy Land. In late March 2013, three parallel 150 m line transects (20 m apart) were established in the experimental sites, sandy grasslands along natural restoration gradients. For each transect, 15 sampling points were set up at 10-mintervals, and a soil sample of 5 cm in depth and 20 cm*20 cm in dimension was collected from each sampling point. All soil samples were transported to the laboratory in open plastic bags and chopped and sieved (mess width was 0.2 mm) soon. The sieved soil samples were placed in plastic germination pots and spread evenly to form an approximately 2 cm thick layer in individual pots. Pots were placed in an unheated greenhouse for seed germination. Pots were watered daily with a very fine nozzle in the afternoon. Emergent seedlings were identified to species and carefully removed from the pots. However, some unidentifiable seedlings remained longer in the pots until they were identified. The density of the existing seed bank was expressed as the number of viable seeds per square meter. In 270 plant samples near the sampling points of soil seed bank, species composition, coverage, height and density of standing communities were surveyed in middle August, and the aboveground biomass were investigated by the level cutting method, dry weight of biomass was obtained at oven drying of 85 degrees, 24 hours. At each site, the frequency of species was determined in terms of the 45 sampling points or the 45 quadrats. Several important conclusions could be drawn from this study. (1) Along natural restoration gradients, the average density(the number of viable seeds per unit area, ind·m~(-2)) of soil seed banks was 814, 3 125 and 16 294 ind·m~(-2) respectively, shifting sandy land
中文关键词	自然恢复 ; 土壤种子库 ; 地上定植群落
英文关键词	natural restoration soil seed bank aboveground colonization community
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6171699
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238068
作者单位	湖北大学资源环境学院, 武汉, 湖北 430062, 中国
推荐引用方式 GB/T 7714	赵丽娅,李元哲,陈红兵,等. 科尔沁沙地恢复过程中地上定植群落与土壤种子库特征及其关系研究[J],2018,27(2):199-208.
APA	赵丽娅,李元哲,陈红兵,张劲,&张晓雨.(2018).科尔沁沙地恢复过程中地上定植群落与土壤种子库特征及其关系研究.生态环境学报,27(2),199-208.
MLA	赵丽娅,et al."科尔沁沙地恢复过程中地上定植群落与土壤种子库特征及其关系研究".生态环境学报 27.2(2018):199-208.