QIAO Yuning,DONG Congguo,HUANG Min,et al.Ecological Stoichiometric Characteristics of Robinia pseudoacacia in Different Vegetation Zones on the Loess Plateau[J].Research of Soil and Water Conservation,2020,27(04):31-38,46.
黄土高原不同植被带刺槐生态化学计量特征
- Title:
- Ecological Stoichiometric Characteristics of Robinia pseudoacacia in Different Vegetation Zones on the Loess Plateau
- 文章编号:
- 1005-3409(2020)04-0031-08
- 关键词:
- 生态化学计量; 植被带; 刺槐人工林; 叶片—枯落物—土壤系统; 气候因子
- Keywords:
- ecological stoichiometry; vegetation zone; Robinia pseudoacacia plantation; leaf-litter-soil system; climatic factors
- 分类号:
- S792.27; S714.8
- 文献标志码:
- A
- 摘要:
- 为阐释刺槐(Robinia pseudoacacia)人工林在不同植被带下的化学计量特征,明确气候因素对其的影响,采用样地调查与实验室分析结合处理的方法对黄土高原森林带、森林草原带、草原带中刺槐人工林的叶片、枯落物及土壤进行C,N,P含量测定,分析了化学计量比,同时剖析了气候因子与各元素之间的关系。结果表明:(1)不同组分C,N,P含量差异均显著,表现为叶片>枯落物>土壤,各植被带内养分含量表现各异,其中森林草原带叶片与土壤养分含量处于最高水平。(2)同植被带C/P与N/P均呈现出叶片与枯落物显著高于土壤的趋势,而植被带间各组分化学计量比差异程度不同。(3)各植被带养分含量在叶片—枯落物—土壤间均具有一定的相关性,表明养分在生态系统内持续流动。(4)叶片C,N,P含量随着年均降水(MAP)和年均温度(MAT)的升高而降低,而枯落物与之表现出相反的趋势,土壤养分随年均太阳辐射量(MASR)增大而降低。研究结果为深入探索黄土高原刺槐人工林养分在空间上的耦合机制提供一定的参考依据。
- Abstract:
- To understand stoichiometric characteristics of Robinia pseudoacacia plantation in different vegetation zones, clarify the impact of climatic factors, forest, forest steppe and steppe zones on the Loess Plateau were selected to study C, N and P contents of the leaf, litter and soil of Robinia pseudoacacia plantation and analyze stoichiometric ratios by combining field investigations and laboratory analyses, meanwhile, analyze the relationship between climatic factors and various elements. The results show that:(1)there are significant differences in contents of C, N and P of different components, and the contents decreases in the order: leaf>litter>soil; in addition, the nutrients of each vegetation zone are different, among which the nutrient contents of leaf and soil in forest & steppe zone are the highest level;(2)in the same vegetation zone, C/P and N/P of leaf and litter are significantly higher than those of the soil, and stoichiometric ratios of components in different vegetation zones are different;(3)the nutrient contents of each vegetation zone have a certain correlation between leaf, litter and soil, indicating that nutrient continues to flow in the ecosystem;(4)contents of C, N and P of leaf decrease with the increase of annual precipitation(MAP)and annual average temperature(MAT), litter is on the contrary, nutrient contents show the significant positive correlation with MAP and MAT, respectively, while litter presents the opposite trend, and soil nutrients decrease with the increase of annual average solar radiation. These results can provide the reference for exploring the spatial coupling mechanism of the nutrient of Robinia pseudoacacia plantation on the Loess Plateau.
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备注/Memo
收稿日期:2019-07-14 修回日期:2019-09-21
资助项目:国家自然科学基金(41771556); 国家重点研发计划课题(2016YFC0501703); 陕西省水保研发项目(2017sbkj-01)
第一作者:乔雨宁(1994—),男,陕西西安人,硕士研究生,研究方向为水土保持工程。E-mail:brooklyn941127@outlook.com
通信作者:陈云明(1967—),男,陕西渭南人,研究员,博士生导师,主要从事植被生态与水土保持研究。E-mail:ymchen@ms.iswc.ac.cn