农村土地利用方式对嘉兴土壤氮磷含量及其垂直分布的影响

为了探讨农村不同土地利用方式对土壤氮磷含量的影响,采用现场采样及室内分析测试方法,对嘉兴市水稻田、菜地、果园、畜禽养殖、农村庭院5种土地利用方式下的土壤氮、磷及其垂直分布进行了比较研究,结果表明:(1)不同农村土地利用方式土壤中TN、TP、Olsen P含量均呈自上层向下层逐渐降低的趋势.(2)在不同土地利用方式下,0～40 cm土层土壤TN含量差异显著,而40～80 cm土层土壤TN含量差异不大.(3)在不同土地利用方式下,0～80 cm各土层土壤TP、Olsen P含量的差异均显著.在0～80 cm土壤剖面中,养殖场、庭院、果园、菜地土壤TP平均含量分别为水田土壤的4.0、2.1、1.9、1.8倍;土壤Olsen P平均含量分别为水田土壤的35.5、10.6、10.0、4.4倍.

Effects of Rural Land Uses on Contents and Vertical Distribution of Nitrogen, Phosphorus in the Soil Profile in Jiaxing Region

In order to investigate contents and vertical distribution of nitrogen, phosphorus in the soil profile as affected by rural land uses, soil samples were collected at soil depths of 0～5, 5～20, 20～40,40～60 and 60～80 cm from the fields of paddy rice, vegetables, fruit orchards, live-stock farms and rural courtyards in Jiaxing region. Results showed that the contents of total nitrogen(TN) and total phosphorus(TP), and the concentration of Olsen P were decreased with a decrease in soil depths down the soil profile. The soil TN differed significantly at 0～40 cm but tended to become similar at 40～80 cm. The TP and Olsen P in the soil profile, however, varied significantly with land uses. The average con-tent of TP in the whole soil profile of vegetables, fruit orchards, livestock farms and rural courtyards was 4.0, 2.1, 1.9 and 1.8 times of that in the paddy rice soil profile, while the Olsen P in the whole soil profile of livestock farms, rural courtyards, fruit orchards and vegetables was 35.5, 10.6, 10.0 and 4.4 times of that in paddy field rice profile, respectively.