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首页> 外文期刊>The Science of the Total Environment >Spatiotemporal variations and factors affecting soil nitrogen in the purple hilly area of Southwest China during the 1980s and the 2010s
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Spatiotemporal variations and factors affecting soil nitrogen in the purple hilly area of Southwest China during the 1980s and the 2010s

机译：1980年代和2010年代中国西南紫色丘陵区土壤时空变化及影响土壤氮素的因素

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摘要

Determination of soil nitrogen distributions and the factors affecting them is critical for nitrogen fertilizer management and prevention of nitrogen pollution. In this paper, the spatiotemporal variations of soil nitrogen and the relative importance of their affecting factors were analysed at a county scale in the purple hilly area of the mid-Sichuan Basin in Southwest China based on soil data collected in 1981 and 2012. Statistical results showed that soil total nitrogen (TN) increased from 0.88 g kg~(-1) in 1981 to 1.12 g kg~(-1) in 2012, whereas available nitrogen (AN) decreased from 8422 mg kg~(-1) to 74.35 mg kg~(-1). In particular, AN showed a significant decrease in agricultural ecosystems but remained stable in woodland and grassland. Correspondingly, most of the study area exhibited increased TN content and decreased AN content in space. The nugget/sill ratios of TN and AN increased from 0.419 to 0.608 and from 0.733 to 0.790, whereas spatial correlation distances decreased from 12.00 km to 9.50 km and from 9.50 km to 9.00 km, respectively, suggesting that the spatial dependence of soil nitrogen became weaker and that the extrinsic factors played increasingly important roles in affecting the soil nitrogen distribution. Soil group and land use type were the two dominant factors in 1981, followed by topographic factors, vegetation coverage and parent material, whereas land use type became the most important factor in 2012, and the relative contribution of topographic factors declined markedly. The results suggested that land use related to cultivation management and fertilizer application was the decisive factor for soil nitrogen change. The increase in TN content and the decrease in AN content over the study period also suggested improper use of nitrogen fertilizer, which can result in nitrogen loss through increasing nitrification rates. Thus, effective measures should be taken to increase the uptake rate of nitrogen and prevent nitrogen pollution.
机译：确定土壤氮分布及其影响因素对于氮肥管理和防止氮污染至关重要。本文基于1981年和2012年的土壤数据，分析了西南四川盆地中部紫色丘陵区县域土壤氮素的时空变化及其影响因素的相对重要性。统计结果结果表明，土壤总氮（TN）从1981年的0.88 g kg〜（-1）增加到2012年的1.12 g kg〜（-1），而有效氮（AN）从8422 mg kg〜（-1）降低到74.35毫克公斤〜（-1）。特别是，AN的农业生态系统显着减少，但在林地和草地中保持稳定。相应地，大多数研究区域的空间TN含量增加而AN含量降低。 TN和AN的金/基比从0.419增加到0.608，从0.733增加到0.790，而空间相关距离分别从12.00 km减少到9.50 km和从9.50 km减少到9.00 km，这表明土壤氮的空间依赖性更弱的是，外在因素在影响土壤氮分布中起着越来越重要的作用。土壤种类和土地利用类型是1981年的两个主要因素，其次是地形因素，植被覆盖率和母质，而土地利用类型在2012年成为最重要的因素，地形因素的相对贡献显着下降。结果表明，与耕作管理和化肥施用有关的土地利用是影响土壤氮素变化的决定性因素。在研究期间，TN含量的增加和AN含量的减少也表明氮肥的使用不当，这可能通过增加硝化率而导致氮的流失。因此，应采取有效措施以增加氮的吸收率并防止氮污染。

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