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以我国三江平原地区不同开垦年限的白浆土为研究对象,采用Hedley等首次提出经Agbenin J.O.Tiessen H改进的方法对土壤磷库组成成分进行研究,即连续浸提法对土壤中不同形态磷素变化特征进行研究,结果表明:长期开垦施肥可显著增加土壤中活性无机磷(Resin-Pi和NaHCO3-Pi)和有机磷(NaHCO3-Po)的含量,NaOH-Pi随开垦年限增加含量升高,且其占总无机磷的比例随开垦年限增加而增加,开垦0 a最低(3.89%),开垦30 a后比例达到最高值(41.98%)。难溶性无机磷(1M HCl-Pi和Conc-HCl-Pi)占总无机磷的比例随开垦年限增加而降低(65.98%~30.98%),NaOH-Po是有机磷库的主要组成部分(57.91%~84.41%),开垦0 a比例最高(84.41%),开垦30 a后比例最低(57.91%)。在开垦前20 a有机磷是该地区白浆土土壤磷库的主要组成部分。
Taking the white soil of different reclamation years in the Sanjiang Plain of our country as the research object, the method of Agbenin JOTiessen H was first proposed by Hedley et al. To study the composition of the soil phosphorus pool, that is, the continuous extraction of different forms of phosphorus in the soil The results showed that the long-term reclamation and fertilization could significantly increase the content of active inorganic phosphorus (Resin-Pi and NaHCO3-Pi) and organic phosphorus (NaHCO3-Po) in the soil and the content of NaOH-Pi increased with the increase of reclamation years, The proportion of total inorganic phosphorus increased with the increase of reclamation years. The lowest of 0 a reclamation (3.89%) and the highest reclamation of reclamation of 30 years (41.98%). The proportion of inorganic phosphate (1M HCl-Pi and Conc-HCl-Pi) in total inorganic phosphorus decreased with the increase of reclamation age (65.98% -30.98%), and NaOH- Po was the main component of organic phosphorus pool (57.91% ~ 84.41%), the highest percentage of reclamation 0 a (84.41%), the lowest proportion of reclamation 30 a (57.91%). Organic phosphorus was the main component of soil phosphorus pool in alluvial soils in the area 20 d before reclamation.