摘要
植被恢复与重建在保护水土资源、防止生态退化和荒漠化扩大等方面发挥着重要作用,成为防治荒漠化的主要措施和方法。一定尺度内优势物种的格局反映了植被恢复的过程。通过在科尔沁沙地流动沙丘迎风坡底部建立了20 m×20 m样方,调查了流动沙丘3种优势物种的位置和高度信息,采用点格局分析的方法,对优势物种格局、过程与尺度的关系进行分析。经研究发现:沙蓬在该样方内,r<5 cm尺度上均匀分布,5 cm<r<50 cm尺度上表现为均匀分布与聚集分布交替出现的格局;狗尾草和差巴嘎蒿在0<r<50 cm尺度上表现为随机分布,但狗尾草在r=10 cm尺度上聚集分布和r=18 cm尺度上均匀分布。在r<5 cm尺度内,沙蓬和狗尾草表现为负相关,随着尺度的增大,出现正相关,但整体尺度以正相关为主且随着尺度增加相关性减弱。同质性条件下种子扩散模型不能解释沙蓬与狗尾草的空间格局,由于流动沙丘异质性较强,推测环境异质性是导致优势物种格局的主要原因。
Vegetation restoration and reconstruction play an important role in protecting water and soil resources,preventing ecological degradation and desertification expansion,and become the main measures and methods to prevent desertification.The pattern of dominant species at a certain scale reflects the process of vegetation restoration.In this paper,we established a 20 m×20 m square at the bottom of windward slope of moving sand dune in Horqin Sandy Land,investigated the location and height information of three dominant species,and analyzed the relationship between dominant species pattern,process and scale by using point pattern analysis method.The study found that:Agriophyllum squarrosum within the samples of 0<X<200 cm,0<Y<200 cm were uniformly distributed at r<5 cm scale,and uniform distribution alternates with aggregation distribution at the scale of 5<r<50 cm.At the scale of 0 cm<r<50 cm,Setaria viridis and Artemisia halodendron showed random distribution,except Setaria viridis aggregated at r=10 cm and uniformly distributed at r=18 cm.In the scale of r<5 cm,there was a negative correlation between Agriophyllum squarrosum and Setaria viridis,with the increase of scale,there was a positive correlation,but they are mainly positive correlation at 0 cm<r<50 cm and significant correlations decrease with scale increasing.The seed dispersal model under homogeneous conditions could not explain the spatial pattern of Agriophyllum squarrosum and Setaria viridis.Due to the strong heterogeneity of moving sand dunes,it is speculated that environmental heterogeneity is the main reason for the dominant species pattern.
作者
贾美玉
陈秋华
张优倩
宋振辉
王泽禹
李国栋
JIA Mei-yu;CHEN Qiu-hua;ZHANG You-qian;SONG Zhen-hui;WANG Ze-yu;LI Guo-dong(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China)
出处
《环境生态学》
2023年第1期71-77,共7页
Environmental Ecology
基金
2022年江西省大学生创新创业训练计划(202210405025)
东华理工大学博士科研启动基金项目(理工类)(202110405024)
东华理工大学大学生创新创业实践中心建设项目“土壤污染生物修复实践中心(2022ZX06)”资助。
关键词
流动沙丘迎风坡底部
格局、过程与尺度
种内相关性
Bottom of windward slope in moving sand dune
pattern,process and scale
intraspecific correlations
