农田营造杨树速生丰产林对地力的影响及效益分析

通过对湖北省杨树主产区石首、公安等县(市)杨树造林地和周边农田20个样本的调查分析,结果表明:粗放经营(未施肥)的杨树林地较农田(常规施肥)土壤板结,有机质、全氮、全磷、速效氮、速效磷、速效钾、有效镁、有效锌含量均较低;平衡施肥能有效改善杨树林地土壤肥力水平。施肥后杨树林土壤有机质,全效氪、磷、钾,速效氮、磷、钾含量均高于农田,农田营造杨树速生丰产林与种植农作物比较,经济效益显著。

Effects of Establishment for Fast-growing and High-yield Poplar Plantation on Soil Fertility and Economic Benefits Analysis in Farmland

This paper analyzed 20 soil samples collected from poplar afforestation and surrounding farmland in Shishou and Gongan city, the main poplar productive areas in Hubei province. It shows that the soil was more hardy in poplar forest land without fertilization i.e. extensive management than relative to farmland with conventional fertilizer application, and the organic matter, total nitrogen, total phosphorus, quick acting nitrogen, phosphorus, and potassium, available magnesium and zinc were lower than farmland. On the contrary, balanced fertilization could improve the fertility level instill of poplar forest land, and soil organic matter, total nitrogen, phosphorus, and potassium, quick acting nitrogen, phosphorus and potassium were bigger than farmland. The economic benefits from constructing poplar high—yield and fast—growing forest in farmland were significantly increased compared with planting agricultural crops.