摘要
围封是沙漠化草地恢复的重要途径,对植物群落结构、功能产生重要影响。为了探究长期围封对严重沙漠化草地植被恢复的影响机制,本文基于时空替代法,对科尔沁沙地严重沙漠化草地围封22、41年植物群落进行研究。结果表明:(1)与流动沙丘(严重沙漠化,恢复起始对照)相比,长期围封显著增加植被盖度、高度、地上生物量,植被密度先增后降。(2)随围封年限增加,植物群落由以狗尾草(Setaria viridis)为主的一年生禾草(围封22年后重要值为0.75)向以白草(Pennisetum centrasiaticum)、猪毛蒿(Artemisia scoparia)为主的多年生草本植物(围封41年后重要值为0.78)演替。(3)随围封年限增加,物种多样性显著增加,共现网络关系更加复杂(平均度由1.47增加到1.60)。(4)土壤理化性质累计解释植物群落特征55.5%的方差,其中,土壤有机碳、容重、含水量是最主要的影响因素。尽管围封是严重沙漠化草地植被恢复的有效措施,但经过41年围封后群落结构、优势物种组成、物种共现网络关系等与疏林草地(近顶级参照)仍存在较大差异。
Enclosure is an important way to restore desertified grasslands,which has a significant impact on the structure and function of plant communities.Through the time-space substitution method,the plant communities after 22 and 41 years of enclosure of severely desertified grassland for natural recovery in Horqin Sandy Land were studied,to explore the driving mechanisms of long-term enclosure on vegetation restoration in severely desertified grasslands.The results showed that:(1)Compared with mobile sand dunes(severe desertification and the beginning of restoration),long-term enclosure significantly increased vegetation coverage,height,and aboveground biomass,while vegetation density increased first and then decreased.(2)With the increasing enclosure years,the plant community evolved from annual grasses(with an important value of 0.75 after 22 years of enclosure)dominated by Setaria viridis to perennial herbaceous plants(with an important value of 0.78 after 41 years of enclosure)dominated by Pennisetum centrasiaticuma,Artemisia scoparia,etc.(3)With the increasing enclosure years,species diversity significantly increased and co-occurrence network relationships become more complex(with average degree increased from 1.47 to 1.60).(4)Soil chemical and physical properties explained 55.5%of the variation in plant communities.Among them,soil organic carbon,bulk density,and soil moisture content,are the main driving factors.Although enclosure is an effective measure for vegetation restoration in severely desertified grasslands,the community structure,dominant species composition,and species co-occurrence network relationships after 41 years of enclosure differed significantly from sparse forest grasslands(reference for climatic climax community).The results can provide data support and theoretical basis for the development of adaptive management strategies for vegetation restoration in desertified grasslands.
作者
曹雯婕
陈云
李玉强
王旭洋
龚相文
郭紫晨
Wenjie Cao;Yun Chen;Yuqiang Li;Xuyang Wang;Xiangwen Gong;Zichen Guo(College of Chemistry and Chemical Engineering,Yunnan Normal University,Kunming 650500,China;Faculty of Geography,Yunnan Normal University,Kunming 650500,China;State Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station/School of Geographical Sciences,Southwest University,Chongqing 400715,China;College of Water Conservancy And Hydropower Engineering,Gansu Agricultural University,Lanzhou 730000,China)
出处
《中国沙漠》
北大核心
2025年第4期262-271,共10页
Journal of Desert Research
基金
国家自然科学基金:项目(42301080,42307564)
甘肃省基础研究计划项目(23JRRA636)。
关键词
科尔沁沙地
围封
植物多样性
共现网络
土壤性质
Horqin Sandy Land
enclosure
plant diversity
co-occurrence network
soil properties
