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为了解杭州市耕地土壤肥力的空间差异,指导科学施肥,比较分析了杭州市滨海平原、水网平原、河谷平原和丘陵山地等4个农业地貌区间耕地土壤p H、有机质、全氮、有效磷、速效钾和CEC等主要肥力指标状况。结果表明,杭州市耕地土壤酸化以丘陵山地和河谷平原区最为明显;滨海平原区耕地土壤有机质、全氮及保肥能力明显低于其他地区;除水网平原区外,其他地区速效钾普遍偏低;因施肥水平的差异各农业地貌内土壤有效磷都有较大的变化。总体上,耕地土壤肥力水平以水网平原区为最高。文中提出了各农业地貌区的施肥对策:在滨海平原应重视基础地力的提升,增加有机肥料的投入;水网平原区内应重视测土施肥工作,根据土壤养分实际状况针对性地施用肥料;丘陵山地和河谷平原区,需重视石灰的施用,对土壤酸度进行核正,适当增加钾肥的用量。
In order to understand the space difference of cultivated land fertility in Hangzhou and to guide the scientific fertilization, soil p H, organic matter, total nitrogen and available phosphorus in four arable land areas of Hangzhou coastal plain, water network plain, valley plain and hilly area were compared. , Available potassium and CEC and other major indicators of fertility conditions. The results showed that the soil acidification of cultivated land in Hangzhou was the most obvious in the hilly and valley plain areas. The soil organic matter, total nitrogen and fertilizer holding capacity of the cultivated land in the coastal plain area were significantly lower than those in other areas; except for the plain of the water network, Low; due to differences in fertilization levels of soil available phosphorus in all agricultural landscapes have greater changes. In general, the soil fertility level of arable land is the highest in the water plain area. The article put forward the countermeasures of fertilization in each agro-topography area: in coastal plain, the improvement of basic soil fertility should be emphasized and the input of organic fertilizers should be increased; soil fertilization should be paid great attention in the plain area of water network; fertilizer should be applied according to the actual situation of soil nutrients; Mountain and valley plain areas, the need to focus on the application of lime, soil acidity correction, an appropriate increase in the amount of potash.