城市化对都市农业景观的影响*--以西安市长安区为例

Impacts of urbanization on urban agricultural landscape-A case study of Chang'an District, Xi'an City

  • 摘要: 城市化对都市农业景观的影响日益显著, 研究城市化对都市农业景观格局的影响对协调城市化与都市农业发展、优化城市与都市农业功能、把都市农业景观融入城市景观建设具有重要意义。本文以西安市长安区为案例, 利用遥感、GIS及FRAG-STATS 3.3软件对研究区都市农业景观(耕地和园地)变化进行了分析, 并利用SPSS软件分析了城市化与都市农业景观格局的关系。结果表明: ①随着城市化的发展, 长安区耕地面积减少, 2011年耕地聚集度比1999年下降了2.45%; 而园地面积增加, 斑块形状趋于复杂, 2011年聚集度比1999年上升了10.44%。②研究区内15个乡镇(街道)的耕地破碎度呈上升趋势, 而园地面积在各乡镇(街道)都表现为增加, 聚集度上升。③相关关系表明, 随着城市化水平提高, 耕地面积减少, 破碎度上升, 但综合城市化与耕地斑块数量、形状指数、聚集度等的相关性尚难以确定; 而园地随城市化水平的提高, 在空间上呈集聚趋势; 除此之外, 城市化与园地的景观指数相关系数普遍较低, 相关系数都小于0.5, 相关性不显著。④不同城市化水平对耕地和园地的作用机制不同, 耕地在较高城市化水平和较低城市化水平下与城市化景观指数的相关关系相对明确; 但园地在中、低城市化水平下城市化与其对景观的影响作用机制比较复杂, 相关关系不明确。因此得出, 园地在城市中面积增加但分布零散, 在以后的城市规划工作中应重视这一部分。

     

    Abstract: There is an increasingly significant impact of urbanization on urban agricultural landscape. Knowing what changes are occurring in urban agricultural landscape patterns as a result of urbanization is critical for adjusting and optimizing the interactions between urbanization and urban agriculture. This is also critical for constructing urban landscapes which integrate into urban agriculture and thereby induce sustainable development. By using remote sensing (RS), Geographic Information System (GIS) and FRAG-STAT techniques, the dynamic changes in urban agricultural landscape (arable lands and garden plots) in the process of urbanization were analyzed in this paper. The paper used Chang'an District of Xi'an City as a case. It discussed the relationship between urbanization and urban agricultural landscape. The results show: ① Compared with 1999, the area of arable lands decreased and aggregation of arable lands declined by 2.45% in 2011 in Chang'an District. The area of garden plots increased while their aggregation increased by 10.44% in 2011 compared with those in 1999. ② The fragmentation of arable lands increased in 15 towns and subdistricts, while area and aggregation of garden plots increased. ③ Correlation analysis showed that improvement of urbanization level decreased area, and increased fragmentation of arable lands. However, the correlations between comprehensive urbanization level and patch number, shape index and aggregation index of arable lands were difficult to determine. Garden plots showed an agglomeration trend in space. Furthermore, the correlation coefficients between urbanization level and landscape indexes of garden plots were less than 0.5, which was insignificant. ④ There were different action mechanisms of urbanization levels on arable lands and garden plots. In higher and low levels of urbanization, the relationship between urbanization and arable lands landscape indexes were relatively clear. However, for garden plots, there was more complex relationship between urbanization level and landscape indexes in middle and low levels of urbanization. This relationship also was not clear. The results suggested that garden plots area increased, although with scattered distribution during urbanization. Future urban planning should lay more emphasis on this aspect of urbanization and agricultural landscape.

     

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