Journal of Plant Ecology ›› 2021, Vol. 14 ›› Issue (5): 896-910.DOI: 10.1093/jpe/rtab041

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  • 收稿日期:2020-12-15 修回日期:2021-01-24 接受日期:2021-03-30 出版日期:2021-10-01 发布日期:2021-06-11

Effects of Robinia pseudoacacia on the undergrowth of herbaceous plants and soil properties in the Loess Plateau of China

Qian Guo1, Zhongming Wen1,2, *, Cheng Zheng1, Wei Li2, *, Yongming Fan1 and Duoju Zhu1   

  1. 1 College of Grassland Agriculture, Northwest A&F University, Yangling 712100, China, 2 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conversion, Northwest A&F University, Yangling 712100, China

    *    Corresponding author. E-mail: zmwen@ms.iswc.ac.cn (Z.W.); liwei2013@nwsuaf.edu.cn (W.L.)
  • Received:2020-12-15 Revised:2021-01-24 Accepted:2021-03-30 Online:2021-10-01 Published:2021-06-11

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摘要： 刺槐对黄土高原林下草本植物及土壤性质的影响
外来物种刺槐(Robinia pseudoacacia)的引入会对林下草本植物、土壤性质及二者之间的相互关系产 生一定影响，且这种影响可能与植被带有关。然而，在黄土高原较大面积范围内，关于刺槐对林下草本植物和土壤影响的研究依然很少。我们以黄土高原草原带、森林草原带和森林带作为研究区，选择了两种冠层植物类型：刺槐林分和相邻的原生植被。我们测定了5个叶片功能性状：叶片碳含量、叶片氮含量、叶片磷含量、比叶面积和叶组织密度，并计算了群落功能多样性、物种多样性和群落加权性状值。研究结果表明，(1)与原生植被相比，3个植被带内林下草本植物群落的叶氮、叶磷和比叶面积的群落加权性状值均显著提高，而叶碳和叶组织密度的群落加权性状值显著降低。(2)物种多样性、功能多样性和群落生物量在草原带内呈下降趋势，在森林带内呈上升趋势，在森林草原带内差异不显著。(3)与原生植被相比，土壤有机碳和土壤全氮仅在森林带内显著减少。(4)林下草本植物群落特性与土壤之间的关系是受刺槐和植被带所依赖的。总的来说，刺槐对林下草本植物和土壤性质的影响与植被带密切相关。该研究结果对黄土高原人工植被恢复与重建的规划具有重要指导意义。

关键词: 群落加权性状值, 功能多样性, 刺槐(Robinia pseudoacacia), 物种多样性, 延河流域

Abstract:

Aims

The introduction of Robinia pseudoacacia (RP) has some effects on undergrowth herbaceous plants (UH), soil properties and their relationships, which may be related to the vegetation zone. However, few studies have tested effects of RP on UH and soil over a large-scale area of the Loess Plateau.

Methods

The study area consisted of three vegetation zones (the steppe, forest-steppe and forest zone). Two canopy plant types were selected: RP stands and adjacent native vegetation. We measured five leaf functional traits: leaf carbon content (LC), leaf nitrogen content (LN), leaf phosphorus content (LP), specific leaf area (SLA) and leaf tissue density (LTD). The functional diversity, species diversity and community-weighted mean (CWM) traits were calculated.

Important Findings

(i) CWM.LN, CWM.LP and CWM.SLA increased significantly, whereas CWM.LC and CWM.LTD decreased significantly in the three vegetation zones, compared with the native communities. (ii) Species diversity, functional diversity and community biomass decreased in the steppe zone, increased in the forest zone, and did not differ significantly in the forest-steppe zone. (iii) We found only soil organic carbon (P < 0.05) and soil total nitrogen (P < 0.05) in the forest zone decreased significantly compared with the native plots. (iv) The relationship between UH and soil properties was affected by RP and the vegetation zone. Overall, the effect of RP on UH and soil properties was associated with the vegetation zone. This result is of great significance to the planning of restoration and reconstruction of artificial forests in the Loess Plateau.

Key words: community-weighted mean traits, functional diversity, Robinia pseudoacacia, species diversity, Yanhe river basin

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