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通过对北京市顺义区长期定位监测点的长期监测,结合每年测定采集土样的化验结果,分析顺义区耕地土壤肥力的现状和随年份的变化趋势,以便对以后耕作制度的调整和肥料投入提供参考依据。结果表明:1)顺义区监测地块中肥力和低肥力地块占76.6%,反映出顺义区耕地水平还处于中低水平;2)顺义区的碱解氮要明显高于京郊的平均水平,而速效钾则明显低于京郊平均水平,其余的几项指标基本持平;3)随着年份的变化,在全氮上,粮田、果树地的全氮基本趋于平稳,牧草地的全氮有所下降;在有机质上,有机质变化趋势基本上和全氮相同;在有效磷上,有效磷菜田>果树>粮田>牧草,菜田的有效磷含量明显高于其他的3种种植类型,蔬菜和果树的有效磷有了一定的增加,粮田和牧草地基本上在一定范围内呈现上下波动;在速效钾上,菜田>果树地>粮田,2008年牧草地的速效钾养分出现了明显下降。
Based on the long-term monitoring of long-term monitoring points in Shunyi District of Beijing Municipality and the annual soil testing results, the status of soil fertility and its changing trend with years in Shunyi District were analyzed to adjust the later farming system and fertilizer input Reference. The results showed that: 1) Fertility and low fertility plots in the monitoring plots of Shunyi District accounted for 76.6%, reflecting that the cultivated land level in Shunyi District was still at a low level; 2) Nitrogen content in Shunyi District was significantly higher than that in the suburbs of Beijing , While available potassium was significantly lower than the average level in the suburbs of Beijing, and the rest of the indicators were basically the same. 3) With the change of years, the total nitrogen in grain fields and fruit trees tended to be stable on the total nitrogen, Total nitrogen decreased; on organic matter, the change trend of organic matter was basically the same as that of total nitrogen; on available phosphorus, available phosphorus field> fruit tree> grain field> pasture and vegetable field, the effective phosphorus content was obviously higher than the other three kinds The available phosphorus in vegetables, fruit trees and fruit trees increased to a certain extent. Grain and pasture areas fluctuated basically within a certain range. On the available potassium, vegetable field> fruit tree land> grain field, Potassium nutrients showed a significant decline.