不同采伐强度下龙竹林生态功能健康状况评价

Evaluation of Ecological Function Health Status of Dendrocalamus giganteus Forest Under Different Logging Intensities

  • 摘要: 针对龙竹林采伐后生态功能可能衰退的隐患,以滇西南地区4种不同采伐强度(择伐、1/3丛采伐、1/2丛采伐、全丛采伐)的龙竹林为研究对象,结合龙竹林群落特征与生境特点,从系统活力、系统恢复力、抵抗力和土壤状况4个维度筛选16项关键指标,建立龙竹林健康综合评价指标体系。运用主成分分析法和综合指数法对其权重和健康指数进行计算,并依据优质、健康、亚健康、不健康和疾病5个等级对其生态功能健康状况进行评价。结果表明:择伐、1/3丛采伐、1/2丛采伐、全丛采伐的健康指数分别为6.68、7.15、8.44、4.18,平均健康综合指数为6.61,生态功能整体处于健康状况。1/2丛采伐强度的叶面积指数、枯落物厚度、生物量、土壤侵蚀程度、土壤厚度等指标具有显著优势,展现出最高的综合健康水平;全丛采伐在生物量、土壤侵蚀程度、物种多样性等指标上显著低于其他样地,整体表现处于最低水平。针对龙竹林的采伐经营活动,建议以1/2丛采伐为首要参考依据,从而设计更为科学且合理的采伐策略。

     

    Abstract: In response to the potential decline in ecological function of Dendrocalamus giganteus forests after logging, this study selected 4 logging intensities (selective logging, 1/3 clump logging, 1/2 clump logging, and full clump logging) in southwestern Yunnan as research sites. Combining the community characteristics and habitat features of the Dendrocalamus giganteus forest, 16 key indicators were selected from 4 dimensions: system vitality, system resilience, resistance, and soil conditions, to establish a comprehensive health evaluation index system for the Dendrocalamus giganteus forest. Principal component analysis and comprehensive index method were used to calculate the weights and health index (H), and the ecological function health status was evaluated based on five grades:excellent, healthy, sub-healthy, unhealthy, and diseased. The results show that the health indices of selective logging, 1/3 clump logging, 1/2 clump logging, and full clump logging are 6.68, 7.15, 8.44, and 4.18 respectively, with an average comprehensive health index of 6.61, indicating that the overall ecological function is in a healthy state. The 1/2 culm harvesting intensity shows significant advantages in leaf area index, litter thickness, biomass, soil erosion degree, and soil thickness, indicating the highest overall health level. In contrast, full culm harvesting performs significantly worse than other plots in terms of biomass, soil erosion degree, and species diversity, with the overall performance at the lowest level. For harvesting activities in D. giganteus forests, it is recommended to use 1/2 culm harvesting as the primary reference basis for designing a more scientific and reasonable harvesting strategy.

     

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