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采用GPS定位和土钻取样相结合的方法,研究了河南境内淮河干流及其四条支流(贾鲁河、惠济河、双洎河、清巽河)沿岸2km范围内土壤硝态氮的空间分布规律与累积状况,结果表明:该区域内土壤硝态氮含量普遍偏低,从空间分布来看,土壤硝态氮含量自上而下基本呈逐渐降低的趋势,一些样点存在硝态氮淋溶现象。0～80cm土层硝态氮累积总量清巽河沿岸土壤最高,32个取样点平均为98.8kghm-2;淮河干流沿岸土壤次之,32个点平均为78.9kghm-2;相比之下,双洎河、惠济河沿岸土壤硝态氮累积量较低,双洎河沿岸土壤40个点平均为73.5kghm-2,惠济河沿岸土壤64个点平均为72.3kghm-2;贾鲁河沿岸土壤最低,72个点平均仅为63.7kghm-2。同一河流不同取样点之间相差极大,可达几十倍至几百倍。
This paper studied the spatial distribution of nitrate nitrogen in the soil within 2km along the coast of Huaihe River and its four tributaries (Jialu, Huiji, Shuangba, Qingtao River) and The results showed that the content of soil nitrate nitrogen in the area was generally low. From the perspective of spatial distribution, the soil nitrate nitrogen content gradually decreased from top to bottom, and some samples had nitrate leaching . The total amount of nitrate accumulation in 0 ~ 80cm soil layer was the highest in the bank of Qingbai River with the average of 32 samples being 98.8kghm-2. The soil along the Huaihe River was the second with an average of 78.9kghm-2 at 32 points. , While that of Shuanghe River and Huiji River was lower than that of Shuanghe River. The average soil nitrate accumulation in Shuangjihe River was 73.5kghm-2, that of the Huiji River was 64.33gghm-2, The lowest soil, 72 points average only 63.7kghm-2. The same river between different sampling points vary greatly, up to several times to several hundred times.