不同龄级瑞香狼毒影响微尺度高寒草甸群落结构
Effects of Stellera chamaejasme Development on Community Structure of Micro-scale Topography in Alpine Meadow
朱文琰 1杨畅 2许明圆 2王娅琳 3徐世晓 3孙平4
作者信息
- 1. 河南科技大学园艺与植物保护学院,河南 洛阳 471003
- 2. 河南科技大学动物科技学院,河南 洛阳 471003
- 3. 中国科学院西北高原生物研究所,青海 西宁 810008
- 4. 河南科技大学动物科技学院,河南 洛阳 471003;青海大学省部共建三江源生态与高原农牧业国家重点实验室,青海 西宁 810016
- 折叠
摘要
通过样圆法群落调查探究不同龄级狼毒对微尺度草地群落结构和土壤化学计量特征的影响,结果表明:(1)狼毒能显著降低微尺度草地的群落盖度、群落加权平均高度、植物密度和地上生物量等指标,且影响程度随着狼毒龄级的增加而增大.(2)狼毒显著改变了草地的群落结构,降低了禾本科和莎草科植物的优势度,增加了杂草植物的优势度,随着狼毒龄级的增加,杂草的优势度逐渐增加.(3)狼毒的生长增加了退化草地物种多样性,但当狼毒龄级达到Ⅴ龄时,草地物种多样性逐渐降低.(4)随着狼毒龄级的增加,土壤全碳含量、全氮含量和全磷含量整体呈显著下降趋势,而碳磷比和氮磷比呈显著上升趋势.总之,狼毒对微尺度高寒草甸植物群落结构和土壤化学计量特征有显著影响,且与龄级有关,建议在修复狼毒型退化草地时,应及时进行人工干预,尤其在狼毒龄级达到Ⅴ龄之前,采取围栏封育、施氮肥和补播豆科优良牧草等措施,加强退化草地的生态修复.
Abstract
This study investigated the influence of Stellera chamaejasme at different developmental ages on both community composition and soil stoichiometry within an alpine meadow ecosystem though the circu-lar quadrat method for data collection.The results showed that S.chamaejasme significantly reduced commu-nity coverage,community weighted average height,and plant density and aboveground biomass of grassland on micro-scale,with the impact increasing with its development.Additionally,it decreased the dominance of Gramineae and Cyperaceae while promoting weed dominance.α-diversity initially increased with S.chamae-jasme growth but declined at the V age.Notably,soil total carbon,total nitrogen,and total phosphorus decreased significantly,while carbon phosphorus ratio and nitrogen phosphorus ratio increased with S.chamaejasme age.Our findings demonstrated that S.chamaejasme significantly altered the micro-scale plant community structure and soil stoichiometry in alpine meadow,with the magnitude of impact dependent on its age.This suggested the need for timely intervention measures in S.chamaejasme-type degraded grasslands.Particularly before the V age(about 8 years),implementing enclosure,nitrogen fertilization,and replanting leguminous grasses could support effective ecological restoration.
关键词
高寒草甸/狼毒/重要值/物种多样性/土壤化学计量特征Key words
Alpine meadow/Stellera chamaejasme/Important value/Species diversity/Soil stoichio-metric characteristics引用本文复制引用
基金项目
青海省重点研发与转化计划项目(219-NK-173)
三江源生态与高原农牧业国家重点实验室开放基金(2022-KF-10)
出版年
2024
NETL
NSTL
维普
万方数据