浙南海涂围垦区土壤品质综合评价

系统掌握浙南海涂围垦区土壤品质现状和空间分布特征，为绿地系统规划、土壤改良措施和绿化工程实施提供参考依据。通过取样调查，获得土壤基本性状，再采用模糊数学综合评价土壤品质与分级，并运用全球定位系统（GPS），ARCGIS分析软件和Surfer软件获得土壤品质等值线分布图。结果表明:①研究区域土壤容重偏大，为1.32 g·cm-3，且含盐量高，为7.7 g·kg-1，碱性强，pH 8.25，有机质质量分数偏少，为17.94 g·kg-1，全氮和有效磷质量分数严重偏低，分别为0.69 g·kg-1和4.82 mg·kg-1，而速效钾质量分数丰富，为0.62 g·kg-1。②土壤含盐量是浙南滨海围垦区土壤品质的主要限制因子，容重和pH值也是重要评价指标。③研究区域土壤品质总体较差，并且表层土壤品质（综合评价值为0.482）略好于下层土壤（综合评价值为0.435）。土壤品质分级与等值线分布图可以更好地指导土壤改良和植被构建，需要降低土壤含盐量、pH值和容重，选取优良耐盐碱植物进行绿化种植。图1表5参33

Soil quality evaluation in a coastal reclamation region of southern Zhejiang Province

To systematically comprehend soil quality status and its spatial pattern in a coastal saline reclamation region of southern Zhejiang Province, to provide a reference for green space system planning, and for soil improvement and implementation of the green project, basic soil properties were obtained through survey sampling. A total of 61 soil samples which was composed of 8 to 12 profiles mixed in 0-20 cm and 40-60 cm were collected. A comprehensive soil quality evaluation and classification was conducted using fuzzy mathematics. Then, a soil quality contour map was obtained using GPS, ARCGIS analysis software, and Surfer software. Results showed that (1) soil bulk density (1.32 g·cm-3), salt content (7.7 g·kg-1), and pH (8.25) were all extremely high; soil organic matter (17.94 g·kg-1), total nitrogen (0.69 g·kg-1), and available phosphorus content (4.82 mg·kg-1) were severely deficient; and available potassium (0.62 g·kg-1) was abundant. (2) Soil salinity was the main limiting soil quality factor with soil bulk density and pH being important evaluation indexes. (3) Soil quality status across the study region was generally low with soil quality for the topsoil (I_FI:0.482) better than the subsoil (I_FI:0.435). Therefore, soil quality classification and contour mapping could provide guidance for soil improvement and vegetation planning, but for landscaping, soils would require lower soil salt content, pH, and soil bulk density, along with a selection of highly salt-tolerant plants.[Ch, 1 fig. 5 tab. 33 ref.]