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,0-20 cm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;0-20 cm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。
In this study, the dynamic of yield of alfalfa, soil water and nutrient content in the production of alfalfa in Shunyi region of Beijing were investigated. The results showed that the yield of alfalfa decreased with the sequence of the cuttings in a certain year,but decreased also because of the weather＇s changes and the important and direct influence of soil moisture during the 4 years after sowing. Available N content in 0 - 20 cm soil layer increase showed the ability of alfalfa to improve the soil N, but the effects would not assured if short time of alfalfa growing. Available P content in 0 - 20 cm soil layer decrease showed alfalfa planting could decrease the P in the soil, and the fertilizer of P was needed for the soil of the long-term production of alfalfa.
出处
《华北农学报》
CSCD
北大核心
2007年第B08期144-147,共4页
Acta Agriculturae Boreali-Sinica
基金
国家"863"计划项目(2006AA10Z241)
科技支撑计划(2006BAC01A12)
