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吉林省西部地区实施土地整理和引水工程后累计新增水田2.7×105hm2,盐碱地改水田后,以TN(总氮)、TP(总磷)和盐类物质为输出特征污染物的水田退水污染问题凸显。2010年对位于吉林省西部镇赉县的典型试验水田采用田间试验研究方法,分析了水田排水中TN、TP和总盐量年净输出强度特征,估算了年净输出负荷,并研究了盐碱水田收割后土壤中盐碱离子含量动态特征。结果表明:田间排水中TN、TP和总盐量的年净输出强度为4.7 kg/hm2,0.29 kg/hm2和3 159.7 kg/hm2;年净输出负荷为:1.269×105kg/hm2、0.783×104kg/hm2和8.531×107kg/hm2;盐碱水田退水中以巨量盐类物质净输出为特征。
After the land consolidation and diversion project was implemented in the western Jilin Province, a total of paddy fields of 2.7 × 105hm2 were newly added, and saline-alkali land was converted into paddy fields. Pollution from paddy fields with TN (total nitrogen), TP (total phosphorus) and salt as output pollutants The problem is highlighted. In 2010, a field experiment was conducted in a typical paddy field in Juxian County, west of Jilin Province to analyze the net output intensity characteristics of TN, TP and total salt in drainage in paddy fields. The annual net output load was estimated, Dynamic Characteristics of Saline and Alkali in Soils after Harvesting. The results showed that the annual net output intensity of TN, TP and total salt in the field was 4.7 kg / hm2, 0.29 kg / hm2 and 3 159.7 kg / hm2, respectively. The annual net output load was 1.269 × 105 kg / hm2 and 0.783 × 104 kg / hm2 and 8.531 × 107kg / hm2. The net output of huge amount of salt in the saline-alkali water reclamation was characterized.