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| 成都平原农地利用方式转变下表层土壤速效钾变化特征 |
| Variation characteristics of soil available potassium in topsoil under the changes of agricultural land use in Chengdu Plain |
| 投稿时间：2022-11-22 修订日期：2023-01-15 |
| DOI： |
| 中文关键词: 速效钾 农地利用方式转变 土壤母质 成都平原 |
| 英文关键词: available potassium agricultural land-use change parent material types Chengdu Plain |
| 基金项目:四川省自然科学(2022NSFSC0104) |
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| 中文摘要: |
| 为了掌握区域土壤速效钾含量变化特征及其影响因素,在成都平原选择184个1980s第二次土壤普查时采集的样点数据和176个2016~2017年获得的样点数据,采用一般统计和单因素方差分析法(ANOVA)探究了近40年来成都平原农地表层(0~20cm)土壤速效钾(AK)含量变化特征及其与农地利用方式转变和母质类型的关系。结果表明,研究区农地表层土壤速效钾含量从44.44mg.kg-1增加到57.24 mg.kg-1,且增幅较大(28.80%(p＜0.05))。与1980s传统稻-麦/油轮作相比,2016~2017年稻-蔬轮作和稻-麦/油轮作表层土壤速效钾含量分别增加了103.83%(p＜0.05)和17.64%,而园林地表层土壤速效钾则减少了11.95%。不同母质类型上,灰棕冲积物发育的土壤表层速效钾含量增幅最高,为82.07%(p＜0.05),其次是更新统老冲积物(25.48%)和灰色冲积物(9.82%)。与传统稻-麦/油轮作相比,稻-蔬轮作下灰棕冲积物发育的土壤速效钾累积量增幅(135.96%,p＜0.05)远高于更新统老冲积物(116.04%,p＜0.05)和灰色冲积物(79.30%,p＜0.05),而园林地只增加了灰棕冲积物和更新统老冲积物发育土壤的速效钾累积量增幅,降低了灰色冲积物发育土壤的速效钾累积量增幅。这表明,农地利用方式的转变改变了研究区表层土壤速效钾累积特征,但其对累积规律的影响依赖于成土母质类型。 |
| 英文摘要: |
| In order to grasp the characteristics of regional soil available potassium(AK) content changes and its influencing factors, 184 sampling points obtained during the second national soil survey in 1980s and 176 sampling points collected during 2016~2017 were selected in Chengdu Plain. The characteristics of soil available K content changes in the surface layer (0~20cm) of agricultural land in the Chengdu Plain and its relationship with the transformation of agricultural land use mode and parent material type in the past 40 years were explored by general statistics and one-way analysis of variance (ANOVA). The results showed that the available K content in the surface soil of agricultural land increased from 44.44 mg·kg-1 to 57.24 mg·kg-1 in the study area, and the increase was large (28.80%(p<0.05)). Compared with the traditional rice-wheat/oil rotation in 1980s, the available K content of the top soil of rice-vegetable rotation and rice-wheat/oil rotation increased by 103.83% (p<0.05) and 17.64%, respectively, while the available K in the surface soil of garden land decreased by 11.95%. In different parent material types, the available K content in the soil surface layer developed by gray-brown alluvium was the highest, 82.07% (p<0.05), followed by Pleistocene old alluvium (25.48%) and gray alluvium (9.82%). Compared with the traditional rice-wheat/oil rotation, the increase of soil available K accumulation in gray-brown alluvial development under rice-vegetable rotation (135.96%, p<0.05) was much higher than that of Pleistocene old alluvium (116.04%, p<0.05) and gray alluvium (79.30%, p<0.05), while garden land only increased the increase of available K accumulation in gray-brown alluvium and Pleistocene old alluvial soil, and reduced the increase of available K accumulation in gray-brown alluvial and Pleistocene old alluvial soil. This shows that the change of farmland use mode changes the characteristics of available K accumulation in the surface soil in the study area, but its influence on the accumulation law depends on the type of parent material. |
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