乡镇尺度森林景观格局特征与影响因素定量分析
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中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2017MB038、CAFYBB2017ZA007-3)和林业软科学研究项目(2018-R5)


Quantitative Analysis of Forest Landscape Pattern and Its Influencing Factors in Township Scale
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    摘要:

    为更客观、精细地刻画森林生态系统格局的完整性、稳定性和森林资源健康状况,为森林资源源头保护和合理经营管理提供科学依据和决策支持,以河北省易县森林资源清查数据、DEM数据和社会经济资料为基础,运用景观指数、结构方程模型和统计学方法,分析乡镇尺度森林景观类型、数量与分布,研究自然地理、社会经济和土地开发利用主导下森林景观格局特征差异及其影响机制。结果表明,西部山区乡镇森林景观资源优势明显,东部平原乡镇森林资源则较小,森林资源主要分布于海拔100~300m浅山丘陵区和海拔500~800m中山区。在景观和类型水平上,斑块密度(PD)、凝结度(COHESION)对地理环境支配和人类活动干扰的响应更大,低破碎化、高连通性、多样化森林景观与高海拔、高起伏度的地形条件关系密切,乡镇耕地和居民建设用地面积占比(PCLA、PRCLA)越大,林地景观破碎化越强和连通性程度越低。平均坡度(MS)、土层厚度(SD)和高差(ED)作为基础性的控制因素,直接影响耕地、居民建设用地占比等方面,间接作用于森林景观格局。在一定的地形土壤条件下,降低人口数量、耕地数量和居民建设用地占比,可降低森林景观格局破碎化,提升森林景观连通性。

    Abstract:

    To describe the integrity, stability and health of forest ecosystem more objectively and meticulously, and provide scientific basis and decision support for the protection of forest resources at the source and the rational management and management of forest resources, based on the forest resources inventory data, DEM data and social and economic data in Yi County, Hebei Province, the forest landscape types, quantity and distribution of township scale were analyzed by using landscape index, structural equation model and statistical method. The characteristics of forest landscape pattern and its influence mechanism were studied under the dominance of natural geography, social economy and land exploitation and utilization. The following results were obtained: the forest landscape resources of the western mountainous areas were obvious, while the eastern plain villages and towns were smaller. The forest resources were mainly distributed in 100~300m hilly areas and in the middle mountains of 500~800m. At the landscape and type level, the forest resources of the villages and towns in the eastern plain were relatively small. Patches density (PD) and cohesion (COHESION) were more responsive to geographical environment dominance and human activity interference. There was a close relationship between low fragmentation, high connectivity, diverse forest landscape and high elevation, high undulating terrain conditions. The larger the area ratio of proportion of cultivated land area and proportion of resident construction land area (PCLA, PRCLA) was, the lower the degree of fragmentation and connectivity of forest landscape was. Mean slope (MS), soil depth (SD) and elevation difference (ED) as the basic control factors directly influenced the cultivated land and the inhabitant construction land proportion and so on, and it had an indirect action on the forest landscape pattern. Under certain topographic and soil conditions, reducing average population size (APS), the proportion of PCLA and PRCLA can reduce the fragmentation of forest landscape pattern and enhance the connectivity of forest landscape.

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孟超,王计平,支晓蓉,谷建才,张德成.乡镇尺度森林景观格局特征与影响因素定量分析[J].农业机械学报,2019,50(3):212-220.

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  • 收稿日期:2019-01-02
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  • 在线发布日期: 2019-03-10
  • 出版日期: 2019-03-10