山核桃林土壤肥力的研究

通过浙皖两省6个县市13个乡镇27个典型高低产山核桃林产量与土壤肥力的相关调查研究，表明在黑色石灰土和山地黄壤上山核桃生长结果良好，产量高；在第四纪红土及幼年石灰土上，产量低。高产林分的土壤其主要理化指标为：微酸性至中性，质地由轻壤至轻粘，容重小于1．35，有机质大于1．5％，土层厚度在60cm以上。在土壤矿物元素方面，有效的磷、钾含量与产量关系密切，这与山核桃的果肉高磷、钾含量是一致的。

Study on Soil Fertility of Carya cathayensis Forests

Investigation in 13 towns of 6 cities and counties of Zheyang provinces and Anhuiprovince on the correlation of yield to soil fertility in the forest of Carya cathayensis showedthat C. cathayensis trees on black lime soil and hilly yellow soil grow and fruit well withhigh yield, but those on red soil formed during the Quaternary Period and young lime soilhave a low yield. Physiochemically, the soil for high - yield forest is slightly acidic to neutralwith a texture of light loam to light clay. Unit weight less than 1. 35 and organic mattercontent more than 1. 5%. Phosphorus and potassium in the effective form have close relationwith yield, which is confirmed by a high content of P and K in the kernel of the nut.