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中国沙漠 ›› 2025, Vol. 45 ›› Issue (5): 241-252.DOI: 10.7522/j.issn.1000-694X.2025.00123

• • 上一篇    

荒漠绿洲过渡带梭梭( Haloxylon ammodendron )林建植对表层土壤碳氮磷化学计量特征及储量的长期影响

王子婷1,2(), 刘继亮3, 罗永忠1(), 马全林1,2(), 周晓甘1, 罗昕1, 宗文贞2   

  1. 1.甘肃农业大学 林学院,甘肃 兰州 730070
    2.甘肃省林业科学研究院,甘肃 兰州 730020
    3.中国科学院西北生态环境资源研究院,甘肃 兰州 730000
  • 收稿日期:2025-03-28 修回日期:2025-05-31 出版日期:2025-09-20 发布日期:2025-09-27
  • 通讯作者: 罗永忠,马全林
  • 作者简介:王子婷(1980—),女,河南新郑人,研究员,主要从事干旱半干旱区植被恢复研究。E-mail: gslkyw@163.com
  • 基金资助:
    国家重点研发计划项目(2024YFD2201105);国家自然科学基金项目(32160410);国家自然科学基金项目(41771290);国家自然科学基金项目(32160409);国家自然科学基金项目(41561112);甘肃省防沙治沙科技创新项目(2023-ZS-01)

Long-term effects of Haloxylon ammodendron plantations on topsoil carbonnitrogenphosphorus stoichiometry and stocks in the desert-oasis ecotone

Ziting Wang1,2(), Jiliang Liu3, Yongzhong Luo1(), Quanlin Ma1,2(), Xiaogan Zhou1, Xin Luo1, Wenzhen Zong2   

  1. 1.College of Forestry,Gansu Agricultural University,Lanzhou 730070,China
    2.Gansu Academy of Forestry Science,Lanzhou 730020,China
    3.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2025-03-28 Revised:2025-05-31 Online:2025-09-20 Published:2025-09-27
  • Contact: Yongzhong Luo, Quanlin Ma

摘要:

人工固沙植被是荒漠绿洲过渡带的重要生态屏障,其稳定性直接关系到该区域生态防护功能。人工梭梭(Haloxylon ammodendron)林作为典型固沙植被类型,随建植年限变化呈现出阶段性变化,将显著影响土壤环境与生态功能。本研究以张掖绿洲北缘不同林龄(5、10、20、30年)人工梭梭林为研究对象,以流动沙丘和固定沙丘为对照,系统调查土壤理化性质、养分含量及其生态化学计量特征,解析荒漠绿洲过渡带梭梭林建植对表层土壤碳氮磷化学计量特征及其储量的长期影响规律,确定人工固沙植被恢复过程中生物和非生物要素对二者的耦合影响及互馈作用机制。结果表明:固定沙丘土壤C∶N显著高于流动沙丘,而N∶P变化则相反;人工梭梭林建植逐步降低土壤表层C∶N,提高N∶P,30年梭梭林地C∶N升高而N∶P降低。人工梭梭林在建植10年后表层土壤有机碳和无机氮储量显著提高,全氮和全磷储量随着栽植年限的增加而增大,20年梭梭林全氮储量最高。灌木盖度、草本盖度、大型节肢动物数量和土壤黏粉粒含量解释了67.89%的土壤C∶N∶P变化;灌木盖度、草本盖度、大型节肢动物数量、土壤黏粉粒含量、pH值和全盐含量解释了70.70%的C∶N∶P储量变化。总之,人工梭梭林的建植降低了草本盖度和土壤pH值,并在建植初期和中期提高植被盖度、土壤黏粉粒含量和大型节肢动物活动密度及土壤全盐含量,这驱动了表层土壤碳氮磷化学计量和储量变化。

关键词: 荒漠绿洲过渡带, 流动和固定沙丘, 人工梭梭林, 碳氮磷比值, 碳氮磷储量

Abstract:

Artificial sand-fixing vegetation serves as a critical ecological barrier in desert-oasis ecotone, and its stability is closely linked to the effectiveness of regional ecological protection.As a representative type of sand-fixing vegetation, Haloxylon ammodendron plantations undergo distinct developmental phases over time, which markedly influence the soil environment and related ecological functions. To evaluate these effects, Haloxylon ammodendron plantations aged 5, 10, 20, and 30 years at the northern edge of the Zhangye Oasis were selected as study sites, with mobile and fixed sand dunes serving as controls. This study systematically investigated the physicochemical properties, nutrient contents, and ecological stoichiometry of topsoil, assessed the long-term impacts of plantation age on the carbon, nitrogen, and phosphorus stoichiometry and their stocks, and further examined the coupled interactions between biotic and abiotic factors, along with the feedback mechanisms that drive the restoration dynamics of artificial sand-fixing ecosystems. The study found that surface soil C∶N ratios were significantly higher in fixed duns than in mobile dunes, while the N∶P ratios exhibited the opposite trend. The establishment of H. ammodendron plantation gradually decreased surface soil C∶N ratios and increased N∶P ratios, with a distinct pattern observed in the 30-year-old H. ammodendron plantation, where C∶N ratios increased and N∶P ratios decreased. H. ammodendron plantations significantly increased topsoil organic carbon and inorganic nitrogen stocks 10 years after establishment. Meanwhile, total nitrogen and total phosphorus stocks increased with planting age, with the highest total nitrogen stock observed in the 20-year-old H. ammodendron plantation. Shrub cover, herbaceous cover, macro-arthropods, and soil silt and clay content explained 67.89% of the variation in surface soil carbon, nitrogen, and phosphorus stoichiometry. Shrub cover, herbaceous cover, macro-arthropods, soil silt and clay content, soil pH, and soil salt content explained 70.70% of the variation in surface soil carbon, nitrogen, and phosphorus stock. In summary, the establishment of H. ammodendron plantations led to a continuous decline in herbaceous cover and soil pH over time, while shrub cover, soil silt and clay, the macro-arthropods activity density, and soil salt content increased primarily during the pre- and mid-establishment stages. Together, these changes played a key role in driving variations in surface soil carbon, nitrogen, and phosphorus stoichiometry and stock.

Key words: desert-oasis ecotone, mobile and fixed sandy dune, Haloxylon ammodendron plantations, soil carbon, nitrogen and phosphorus stoichiometry, soil carbon, nitrogen and phosphorus stock

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