| 摘要 | 【目的】分析地处西北内陆黄土高原腹地、具有典型丘陵沟壑特征的陕西省安塞县农田土壤pH值和养分的现状及其相关性,为黄土高原丘陵沟壑区提高土地生产力和培肥土壤提供理论依据。【方法】采集安塞县12个乡镇有代表性并能充分反映土壤特性的农田耕层(0～20 cm)土样4 231个,对其pH值及有机质、全氮、碱解氮和速效磷、钾含量进行测定,分析土壤pH值与各养分含量间的相关性。【结果】安塞县农田土壤pH值为8.16,偏碱性,变异程度为弱变异。土壤有机质、全氮含量分别为8.73和0.54 g/kg,碱解氮、速效磷、速效钾含量分别为31.11,8.79和100.68 mg/kg,其中只有速效钾的含量达到了中等肥力水平,其他养分含量均处于中等以下肥力水平;各养分含量均为中等变异。土壤pH值与有机质、碱解氮、速效钾含量呈显著或极显著负相关,有机质含量与全氮、碱解氮和速效磷含量呈显著或极显著正相关。【结论】安塞县农田土壤养分含量较低,土壤有机质含量和pH值影响着土壤速效养分的含量,今后应积极推广配方施肥技术,推进退耕还林还草工程,以提高土壤肥力水平。; 【Objective】 Ansai,a typical hilly-gully region,is located in the middle of the Loess Plateau.The research studied the status and correlation of farmland soil pH value and nutrient content,to provide a basis to improve soil productivity and fertility.【Method】 Soil pH,organic matter,total N,alkali-hydrolyzabled nitrogen,available P,and available K were measured in 4 231 farmland soil samples of 0-20 cm from 12 villages in Ansai.The correlation between soil pH and nutrient content was analyzed.【Result】 The far... |
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