论文部分内容阅读
以1290个土地样品分析数据为依据,对冀西北农牧交错带张北县土壤养分时空变异与生产特性进行了分析研究,结果表明:张北县土壤pH值为8.23,土壤有机质和全氮含量分别20.4g/kg和1.05g/kg,土壤碱解氮、速效磷和速效钾含量分别为80.5mg/kg、20.6mg/kg和181.1mg/kg,和80年代相比均有明显地提高;土壤养分空间分布规律为东南部坝头区高于中部平原区,中部平原区高于西北部丘陵区。随着人类生产活动对土壤性质影响的提高,土壤养分的时空变异性增加,根据张北全县及不同分区的土壤养分时空分异提出适宜的农业生产发展建议。提高土壤有机质和氮含量仍是张北县土壤肥力提高的前提基础,保证土壤中磷和钾的稳定供应对保持土壤肥力、作物高产也是十分必要的。
Based on the analysis of 1290 land samples, the spatial and temporal variability and production characteristics of soil nutrients in Zhangbei County in the ecotone between agriculture and animal husbandry in northwestern Hebei Province were analyzed. The results showed that soil pH value was 8.23, soil organic matter and total nitrogen content Respectively 20.4g / kg and 1.05g / kg. The contents of available nitrogen, available phosphorus and available potassium in soils were 80.5mg / kg, 20.6mg / kg and 181.1mg / kg respectively, which were significantly higher than those in the 1980s. Spatial distribution of soil nutrients in the southeastern part of the dam head area is higher than the central plains, the central plains area higher than the hilly area in the northwestern. With the increase of human activities affecting the soil properties, the spatial and temporal variability of soil nutrients increased. Based on the spatial and temporal variations of soil nutrients in Zhangbei county and different sub-regions, some suggestions for agricultural production development were put forward. Increasing soil organic matter and nitrogen content is still the prerequisite for soil fertility improvement in Zhangbei County. Ensuring a stable supply of phosphorus and potassium in the soil is also necessary for maintaining soil fertility and high crop yield.