不同绿肥作物与油茶幼林套种对丘岗红壤pH值变化和有效养分含量的影响

Effects of Interplanting Different Green Manure Crops with Young Camellia Forest on Dynamic Variation of pH Value and Nutrient Content Effective in Hilly Red Soil Region

采用田间试验考察了红壤丘岗地不同绿肥作物与油茶幼林套种模式对土壤碱解氮、有效磷、速效钾含量和pH值动态变化的影响。结果表明:种植绿肥对土壤pH值影响不大;但能提高土壤碱解氮含量,尤以套种箭舌豌豆最高;由于新垦油茶幼林在套种绿肥的同时增施了磷肥,各处理土壤有效磷含量都较高,土壤供磷能力较强;各处理土壤速效钾含量都不高,在新垦油茶林上应增加钾肥的施用。新垦油茶幼林套种黑麦草、套种紫云英与肥田萝卜混播以及套种毛叶苕子与肥田萝卜混播3种模式在不影响油茶幼林生长的同时,能获得较高的绿肥产量,是促进生态环境保护和农业增产增收的较好种植模式。

The influences of interplanting different green manure crops with young camellia on contents of available N,available phosphorus and available potassium in soil and dynamic variation of soil pH value in hilly red soil region were investigated by field tests.The results indicated that interplanting green manure crops had little influence on soil pH value,but can increase soil available potassium content,especially for interplanting Vicia sativa.Because simultaneous applying P fertilizer and interplanting green manure crops for newly cultivated young camellia forest,soil available P content in each treatment was high,thus,the P-supplying capacity of soil was strong;but soil available K content in each treatment was low,so K fertilizer should be applied.The three interplanting patterns that interplanting young camellia and ryegrass,interplanting milk vetch and radish,and interplanting hairy vetch and radish areal can obtain a good yield of green manure while not affect the growth of young camellia forest,therefore,they are great planting mode for promoting protection of ecological environment and increase of yield and income.