摘要： 调查了北京顺义区河南村紫花苜蓿(WL323)的连续生产过程中的产量、土壤水分和土壤养分含量变化动态。结果表明,刈割产量动态年内随茬次下降,年产量则受气候变化影响波动较大,整体上呈下降趋势,土壤水分含量成为产量变化的直接原因;同时,0~20cm土层的速效氮含量波动升高,说明了紫花苜蓿的土壤改良较强,但短期种植效果不易保证;0~20cm土层中的速效磷含量在4年后降低很多,说明了紫花苜蓿的种植能降低土壤的速效磷含量,实际生产中应注意补充磷肥。

关键词: 紫花苜蓿, 土壤养分, 氮, 磷

Abstract: In this study, the dynamic of yield of alfalfa, soil water and nutrient content in the product ion of alfalfa inShunyi region of Beijing were investigated.The results showed that the yield of alfalfa decreased with the sequence of thecuttings in a certain year, but decreased also because of the weather??s changes and the important and direct influence ofsoil moisture during the 4 years after sowing. Available N content in 0- 20 cm soil layer increase showed the ability of a-lfalfa to improve the soil N, but the effects would not assured if short time of alfalfa growing. Available P content in 0- 20cm soil layer decrease showed alfalfa planting could decrease the P in the soil, and the fertilizer of P was needed for thesoil of the long-term production of alfalfa.

Key words: Alfalfa, Soil nutrient , N, P

中图分类号: 

• S541.9