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土壤肥力是土壤特性的综合反映,也是揭示土壤条件动态变化的最敏感指标,不同尺度下土壤肥力空间格局的影响因素不同。本研究以西湖风景区为研究区域,通过网格布点采样,采用修改的内梅罗公式作为土壤肥力定量计算模型,研究了风景区土壤肥力指数的空间分布及其影响因素。结果表明:西湖风景区土壤为酸性,土壤有机质和有效磷平均含量达到全国第二次土壤普查养分分级标准1级水平,全氮平均含量达2级水平;空间格局上,西湖南部和北部土壤综合肥力指数高于风景区西北部和西南部;不同土地利用方式、植被类型和生态系统类型的土壤综合肥力指数高低顺序分别为居民区>交通区>农业用地>景区绿地>山林地,短柄枹>桂花>香樟>茶园>竹林>青冈>枫树>木荷,绿地草坪>常绿阔叶林>常绿混交林;总体上表现为景观绿地的土壤肥力高于农业土壤和自然土壤。
Soil fertility is a comprehensive reflection of soil characteristics and is also the most sensitive indicator to reveal the dynamic changes of soil conditions. The influencing factors of spatial pattern of soil fertility are different under different scales. In this study, the West Lake Scenic Area was selected as the research area. Through the sampling of the grid layout and the modified Nemerow formula as the quantitative model of soil fertility, the spatial distribution of soil fertility index and its influencing factors were studied. The results showed that the soil in the West Lake scenic area was acidic, the average content of soil organic matter and available phosphorus reached the level 1 of the second national soil nutrient classification standard, and the average level of total nitrogen reached level 2. In the spatial pattern, Fertility index was higher than that in the northwestern and southwestern part of the scenic area. The sequence of soil comprehensive fertility index of different land use types, vegetation types and ecosystem types were residential area> traffic area> agricultural land> scenic green space> mountain woodland, > Sweet-scented osmanthus> camphora> tea plantation> bamboo forest> Cyclobalanopsis glauca> maple> Schima superba and green lawn> evergreen broad-leaved forest> evergreen mixed forest. Generally, the fertility of landscape green land was higher than that of agricultural soil and natural soil.