【摘要】 在兼顾土壤类型与样点空间分布相对均匀性的前提下 ,采集了中国东北地区具有代表性的3个县 (吉林省公主岭、黑龙江省的海伦县和北安县 )的黑土样点190个。采用元素分析仪法对不同地区的黑土中有机质、全氮和全硫进行分析 ,同时采用常规法对其全磷含量进行测定。结果表明 :不同地区黑土中的有机质、全氮、全硫和全磷含量存在明显差异 ,公主岭地区各项指标均低于北安地区 ,海伦地区居中 ,表现出随纬度的增加而不断提高的趋势。不同地区黑土中有机质和全氮含量随开垦年限增长而降低 ,全硫和全磷的含量变化则不明显。由于黑土中有机质、全氮、全硫和全磷含量之间存在明显相关关系 ,因此可用黑土中有机质含量作为评价其土壤肥力质量的综合指标更多还原

【Abstract】 The organic matter, total N and total S in black soils (Isohumosols) selected from 3 areas in the northeastern of China were determined with Elementar III (Germany) and the total P was analyzed with the normal method. The results showed that there were great differences of organic matter, total N, total S and total P among the different areas. Generally, their contents went up with the increase of the latitude. The organic matter and total N (Y) decreased with the increase of reclamation years (t). And they all fit into the formula, Y=Xe-λt. Due to the significant relationships of organic matter with total N, total S and total P, the organic matter could be regarded as an integrated fertility index of Isohumosols.更多还原