摘要
分析不同土地利用方式对土壤各形态钾素含量和有效性的影响,能优化土地利用,并对科尔沁沙地土壤肥力的提升具有重要意义。通过化学分析方法测试土壤的各形态钾素含量,计算非交换性钾转换量、非交换性钾转换率,结果表明:研究区土壤整体钾素质量分数为16.41~20.75 g/kg,但有效钾素质量分数仅占0.76%~2.62%,严重缺乏有效钾素,需要根据作物进行定期施肥。不同土地利用方式使土壤钾库储备显著提升(P<0.05),有效性增强,各形态钾素的有效部分比例提高0.46%~1.86%,质量分数呈现表聚特征,但受研究区土壤质地影响无层化特征。长期稳定的土地利用使土壤的非交换性钾转换量平均提高23 mg/kg,有效钾素间具有显著正相关性,促进各形态钾素间的平衡转化。土壤钾素肥力评价排序为阔叶林>旱田>针阔混交林>水田>针叶林>灌木>天然草地。在不添加钾素的情况下,营造阔叶林或针阔混交林是较好地维护提升风沙土钾素肥力水平的利用方式。
[Background]The northeast region has the highest potassium supply level,but the potassium supply potential of sandy soil in Horqin Sandy Land is extremely low.Clarifying the effects of different land use patterns on the content and availability of various forms of potassium in soil can optimize land use and is of great significance for improving soil fertility in Horqin sandy land.[Methods]Soil samples were collected from 0-20 and 20-40 cm soil layers under seven land use types(paddy field,dry field,natural grassland,shrub,coniferous forest,broad-leaved forest,mixed coniferous and broad-leaved forest)in the southern margin of the Horqin Sandy Land.The contents of 8 forms of potassium in soil was detected by chemical analysis method.Non-exchangeable potassium conversion and conversion rate was calculated.Analysis of variance,correlation analysis(Pearson coefficient)and factor analysis were performed on the detected and calculated data.[Results]1)The overall potassium content of the soil in the study area was 16.41-20.75 g/kg,but the content of available potassium was only 0.76%-2.62%,which was seriously lack of available potassium.2)Different land use patterns significantly increased the soil potassium pool reserve(P<0.05),and the effectiveness was enhanced.The proportion of effective parts of various forms of potassium increased by 0.46%-1.86%,and the content showed surface accumulation characteristics,but it was affected by the soil texture in the study area.3)Long-term stable land use increased the amount of non-exchangeable potassium in soil by 23 mg/kg on average,and there was a significant positive correlation between available potassium,which promoted the balanced transformation of various forms of potassium.4)The order of soil potassium fertility evaluation was broad-leaved forest>dry field>mixed coniferous and broad-leaved forest>paddy field>coniferous forest>shrub>natural grassland.[Conclusions]The study area needs to apply potassium fertilizer regularly to ensure crop growth.In the absence of potassium,having broad-leaved forest or mixed coniferous and broad-leaved forest is a better way to maintain and improve the fertility level of the aeolian sandy soil potassium.
作者
曹怡立
吕刚
张学利
安宇宁
刘亚萍
马骏
卢志朋
郎明翰
CAO Yili;L Gang;ZHANG Xueli;AN Yuning;LIU Yaping;MA Jun;LU Zhipeng;LANG Minghan(School of Environmental Science and Engineering,Liaoning Technical University,123000,Fuxin,Liaoning,China;Liaoning Institute of Sandy Land Management and Utilization,123000,Fuxin,Liaoning,China)
出处
《中国水土保持科学》
CSCD
北大核心
2024年第1期122-130,共9页
Science of Soil and Water Conservation
基金
辽宁省“兴辽英才计划”项目“辽东水源涵养林区煤矿废弃地生态修复关键技术研究”(XLYC2007046)
辽宁工程技术大学双一流学科创新团队建设资助项目“矿山生态修复与水土保持创新团队”(LNTU20TD-24)。
