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林业科学 ›› 2025, Vol. 61 ›› Issue (7): 192-207.doi: 10.11707/j.1001-7488.LYKX20240116

• 研究论文 • 上一篇    

黄土高原刺槐人工林生长对立地质量和林分密度的响应

李平平1,2,王彦辉1,*(),于澎涛1,王依瑞1,2,段文标2,万艳芳1,韦小茶1,史再军3   

  1. 1. 中国林业科学研究院森林生态环境与自然保护研究所 国家林业和草原局森林生态环境重点实验室 北京 100091
    2. 东北林业大学林学院 哈尔滨 150040
    3. 甘肃省平凉市泾川县官山林场 泾川 744306
  • 收稿日期:2024-02-26 出版日期:2025-07-20 发布日期:2025-07-25
  • 通讯作者: 王彦辉 E-mail:wangyh@caf.ac.cn
  • 基金资助:
    中央级公益性科研院所基本科研业务费专项(CAFYBB2021ZW002);国家自然科学基金项目(U21A2005、U20A2085);国家重点研发计划项目(2022YFF0801803)。

Growth Response of Black Locust Plantations to Site Quality and Stand Density on the Loess Plateau of China

Pingping Li1,2,Yanhui Wang1,*(),Pengtao Yu1,Yirui Wang1,2,Wenbiao Duan2,Yanfang Wan1,Xiaocha Wei1,Zaijun Shi3   

  1. 1. Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration Ecology and Nature Conservation Institute, Chinese Academy of Forestry Beijing 100091
    2. College of Forestry, Northeast Forestry University Harbin 150040
    3. Guanshan Forest Farm, Jingchuan County, Pingliang City, Gansu Province Jingchuan 744306
  • Received:2024-02-26 Online:2025-07-20 Published:2025-07-25
  • Contact: Yanhui Wang E-mail:wangyh@caf.ac.cn

摘要:

目的: 分析黄土高原刺槐人工林主要生长指标(平均树高、平均胸径和林分蓄积量)对林龄、林分密度及立地指数的响应规律,构建多因子耦合模型,准确模拟和预测立地质量等因子对刺槐生长的影响,为该地区刺槐人工林可持续经营提供科学依据。方法: 基于2021—2022年样地调查及文献收集数据,首先采用上外包线法确定平均树高和平均胸径对林龄、林分密度和立地指数的单因子响应关系和函数类型;然后,通过连乘构建多因子耦合生长模型的框架,并利用3/4和1/4的数据率定和验证树高与胸径生长的多因子耦合模型;最后,基于模型计算的平均树高和胸径数据,重新率定林分蓄积量生长模型,并用于林分密度管理的情景分析。结果: 1) 随林龄增加,平均树高、胸径均先快速增大后缓慢增大;随密度增加,树高先缓慢降低后快速降低,胸径先快速降低后缓慢降低;随立地指数增加,树高和胸径均近线性增大。2) 建立了耦合立地指数、林龄和密度影响的平均树高、平均胸径和林分蓄积量生长模型,精度均较高(R2分别为0.73、0.67和0.71)。3) 模拟并分析了不同立地指数、林分密度和林龄时的平均树高、平均胸径及林分蓄积量生长,并提出了不同立地条件的刺槐人工林经营策略建议。在劣等(SI<7.5 m)和中等立地(SI为7.5~12.5 m),仅能生产小径级林木(胸径<13 cm),林分蓄积量较低,建议以土壤保持、水文调节等为主导功能,但可在中等立地上兼顾木材生产功能。在优等立地(SI≥12.5 m),林龄40 年前可生产小径级林木;林龄50 年时可生产中径级林木(胸径13~21 cm),林分蓄积量较高,建议以木材生产为主导功能,同时兼顾土壤保持、水文调节等生态功能。结论: 黄土高原刺槐人工林的生长同时受到立地质量和林分结构的影响,建立的包括立地指数、林分密度和林龄的多因子耦合生长模型,可准确地预测和解释不同立地条件下刺槐林生长对密度调控的响应,并据此制定不同经营策略,指导刺槐人工林的可持续经营。

关键词: 刺槐人工林, 多因子耦合生长模型, 立地指数, 林分密度, 黄土高原

Abstract:

Objective: This study aims to investigate the response of main growth parameters (mean tree height, mean DBH, and stand volume) of Robinia pseudoacacia plantations on the Loess Plateau of China to forest age, stand density and site index (SI) , and to establish multi-factor coupling growth models for providing scientific basis of sustainable management of R. pseudoacacia plantations in this study region. Method: Based on the data of sample plots collected from the field surveys in 2021—2022 and literature, the response relations and corresponding function types of mean tree height and mean DBH to the single-factors of forest age, stand density and site index were determined using the upper envelope line method. Then, a framework of multi-factor coupling growth models was established by a continuous multiplication of these function types, and the multi-factor coupling growth models of mean tree height and DBH were calibrated and verified using 3/4 and 1/4 of sample plots data. Thereafter, the growth model of stand volume was re-calibrated based on the model calculated data of mean tree height and DBH, and used to the scenario analysis of stand density management. Result: 1) Both the mean tree height and DBH increase first rapidly and then slowly with rising forest age; With rising stand density, the mean tree height decreases first slowly and then rapidly, while the DBH decreases first rapidly and then slowly; With rising SI, both the mean tree height and DBH increase near linearly. 2) The established growth models of mean tree height, DBH, and stand volume by coupling the effects of multiple factors (SI, forest age, and stand density) have high fitness (R2 = 0.73, 0.67, 0.71). 3). The mean tree height, DBH and stand volume under different SI, stand density, and forest age were simulated and analyzed, and then management strategies of R. pseudoacacia plantations with different site conditions were proposed. At poor sites (SI < 7.5 m) and medium sites (SI = 7.5?12.5 m), only small sized timber (DBH < 13 cm) can be produced with lower stand volume. Therefore, it is recommended that the dominant function of forests at poor sites should be soil conservation, hydrological regulation, or other ecological services, but a low priority should be given to the function of timber production; while the recommended dominant function of forests at medium sites should be still soil conservation or hydrological regulation, but giving consideration to the timber production functions. At fertile sites (SI ≥ 12.5 m), small sized timber can be produced before the forest age of 40 years, while medium sized timber (DBH = 13?21 cm) can be produced at the forest age of 50 years with higher stand volume. Therefore, the recommended dominant function of forests at fertile sites is timber production, while considering the functions of soil conservation, hydrological regulation, and other ecological services. Conclusion: The growth of R. pseudoacacia plantations on the Loess Plateau is influenced by both site quality and stand structure. The established growth models coupling multi-factors (SI, stand density, and forest age) can accurately predict and explain the growth response of R. pseudoacacia plantations to density regulation under different site conditions, and formulate different management strategies accordingly, to guide the sustainable management of R. pseudoacacia plantations.

Key words: Robinia pseudoacacia plantation, multifactor-coupling growth model, site index, stand density, Loess Plateau

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