河源地区桉树人工林土壤肥力和土壤区划研究

Soil Fertility and Soil Regionalization of Eucalyptus Plantation in Heyuan

为了更好地进行针对性的配方施肥,对河源地区桉树人工林的土壤肥力和土壤区划进行研究。结果表明:(1)总体上,河源地区桉树人工林的土壤退化严重,土壤板结,通气透水能力差。有机质、全钾、全磷、水解性氮和速效钾处于中等水平,而全氮和速效磷较缺乏。有效铁、有效钙、有效镁、有效硫较丰富,而有效硼、有效锌、有效锰相对缺乏。(2)花岗岩发育的土壤中有机质、全氮和水解性氮较优,而页岩和砂页岩发育的土壤中微量元素较优;二代萌芽林的土壤养分优于植苗造林。(3)最后把桉树人工林区划为土壤肥力较好地区(编号是3、4、9、11、12、15、19、22)、肥力中等地区(1、2、8、14、16、17、18、20、21)和肥力较差地区(5、6、7、10、13)3个类型,土壤养分含量分别为3.546%～4.415%、2.742%～3.228%和1.795%～2.590%。

In order to better target formula fertilization, the author studied soil fertility and soil regionalization of Eucalyptus plantation in Heyuan. The results showed that： （1） overall, the soil was serious degradation, serious compaction and the ventilation permeable ability was very poor of Eucalyptus plantation in Heyuan. Organi c matter, total potassium, total phosphorus, hydrolysis of nitrogen and quick result of potassium were the middle level, while total nitrogen and available phosphorus were in the lack of level. （2） Organic matter, total nitrogen and hydrolysis of nitrogen of granite soil were in the optimum level, while trace elements of shale and sandshale soil are in the optimum level. Soil nutrients of second generation of budding forest were better than planting by stock. （3） In the end, Eucalyptus plantation were divided into good soil fertility areas （numbers were 3,4,9,11,12,15,19,22）, medium fertility areas （1,2,8,14,16,17,18,20,21） and poor soil fertility areas （5,6,7, 10,13）, soil nutrient contents were 3.546%-4.415% 2.742%-3.228% and 1.795%-2.590%.