水肥耦合效应对保护地土壤硝态氮运移的影响

Coupling effects of water and fertilizers on translocation of nitrate nitrogen in protected land.

采用二次回归正交旋转组合设计,研究了水肥耦合效应对保护地土壤硝态氮运移的影响。结果表明,0—20cm土层硝态氮含量主要受灌水和施氮的影响,且灌水影响程度大于施氮,灌水与0—20cm土层硝态氮含量呈负相关,而与施氮呈正相关。20—40cm土层和40—60cm土层硝态氮也主要受灌水和施氮的影响,但施氮影响程度大于灌水。灌水和施氮对0—20cm土层硝态氮含量影响有相互拮抗作用。施磷对3个层次土壤硝态氮含量影响都很小。

Coupling effects of water and fertilizers on translocation of nitrate nitrogen in protected land were studied with the design of quadratic orthogonal rotational combinations.The results show that content of nitrate nitrogen in 0-20 cm soil layer is mainly affected by water and nitrogenous fertilizer,and negatively related to the former but positively to the latter.And the effect of water is more significant than that of nitrogenous fertilizer.Contents of nitrate nitrogen in 20-40 cm and 40-60 cm soil layers are also mainly affected by water and nitrogen fertilizer,but the effect of fertilizer is more significant than that of the water.The effects of the two are antagonistic on content of nitrate nitrogen in 0-20 cm soil layer.The effect of phosphate fertilizer is not significant on content of nitrate nitrogen in the three soil layers.