不同母岩发育山核桃林地土壤性质及叶片营养元素分析

为了解不同母岩发育山核桃Carya cathayensis林地土壤性质及叶片营养的差异，于2008年7月采集和分析了板岩、花岗岩、千枚岩和砂页岩等4种母岩发育的土壤和山核桃植株叶片。结果表明，花岗岩发育的土壤酸碱度最低（pH 4.72），有机质（43.11 g·kg^－1）和有效硫（38.73 mg·kg^－1）质量分数最高，交换性钙（5.22 mg·kg^－1）和有效锌（1.65 mg·kg^－1）质量分数最低；而有效磷（7.29 mg·kg^－1），有效铁（31.24 mg·kg^－1）和有效锰（67.49 mg·kg^－1）质量分数则以千枚岩发育的土壤为最高；山核桃叶片中各营养元素质量分数的大小顺序表现为氮＞钙＞钾＞镁＞磷＞锰＞铁＞锌；花岗岩发育的土壤上的山核桃叶片氮、钙、镁、锌质量分数最高，磷、铁质量分数最低；不同母岩发育山核桃林地土壤pH值、有机质与多个大中微量元素有效养分之间存在显著或极显著相关关系。叶片氮、钾、钙、镁、铁与土壤多种养分质量分数之间存在一定的相关性。表5参22

Nutrient elements in soil and Carya cathayensis leaves from four parent rock materials

To reveal changes in soil properties and leaf nutrition from different parent rock material in a Carya cathayensis forest in Lin’an City, soil and leaf samples developed from four types of parent rock material： i.e. slate, granite, phyllite, and sandy shale, were collected in July of 2008 and analyzed with a correlation analysis. Results showed soil sampled from the granite parent material had the highest organic matter （43.11 g·kg-1） and available sulfur （38.73 mg·kg-1）; however, it had the lowest pH （4.72）, available calcium （Ca,5.22 mg·kg-1）, and available zinc （Zn,1.65 mg·kg-1）. Soil sampled from the phyllite parent material had the highest available phosphorus （P,7.29 mg·kg-1）, iron （Fe,31.24 mg·kg-1）, and manganese （Mn,67.49 mg·kg-1）. Available nutrient elements in C. cathayensis leaves for all soils were in the order： nitrogen （N）Capotassium（K）MgPMnFeZn. Additionally, leaves growing on soil developed from phyllite parent material had the highest available N, Ca, Mg, and Zn, but the lowest available P and Fe. The correlation analysis was also significant for soil pH, soil organic matter, andavailable nutrients. Correlations for N, K, Ca, Mg, and Fe content in leaves as well as content of soil nutrient element were also significant.