摘要
揭示农地土壤剖面氮素分布特征及其影响因素有助于区域氮肥管理和氮素面源污染防治。基于173个土壤剖面的1356个采样数据,运用地统计学和方差分析方法,分析成都平原农地土壤剖面氮素空间变异特征,探讨农地利用方式和成土母质对土壤氮素剖面分布的影响。结果表明,在垂直方向上,0~100 cm土层全氮和碱解氮含量随土壤深度增加从1.91 g·kg^(-1)和138.48 mg·kg^(-1)分别显著降低至0.55 g·kg^(-1)和25.39 mg·kg^(-1)。在水平空间上,各土层全氮和碱解氮含量空间分布格局一致,总体呈现出由中部向东北部和西南部递增的趋势。稻-蔬轮作地和稻-麦/油轮作地各土层全氮和碱解氮含量之间均无显著差异,而园林地表层(0~20 cm)土壤全氮和碱解氮含量较稻-麦/油轮作地和稻-蔬轮作地2种方式低11.23%~15.78%(P<0.05)。就不同母质类型而言,与Q4灰色冲积物发育土壤相比,Q3老冲积物发育土壤0~40 cm土层全氮和碱解氮含量为其1.12~1.19倍(P<0.05),而>60~100 cm土层全氮含量仅为其0.89倍(P<0.05);Q4灰棕色冲积物发育土壤0~40 cm土层全氮和碱解氮含量为其1.14~1.21倍(P<0.05)。不同农地利用方式在Q3老冲积物发育土壤上4个土层全氮和碱解氮含量均无显著差别(P>0.05)。园林地的Q4灰色冲积物和Q4灰棕冲积物发育表层土壤全氮和碱解氮含量低于其他2种用地方式,而>20~40 cm土层土壤整体高于其他2种用地方式。以上结果说明土壤氮素剖面分布特征受农地利用方式的影响,且这种影响与土壤母质类型有关。
Understanding the profile distribution characteristics of soil nitrogen and its influencing factors in the farmland is essential for regional nitrogen fertilizer management and control of non-point source nitrogen pollution.Based on 1356 samples from 173 soil profiles on the Chengdu Plain,this study analyzed the spatial variation characteristics of soil nitrogen in farmland soil profile using geostatistics and variance analysis and identified the effects of agricultural land use types and soil parent materials on the nitrogen distribution in soil profile.The results show that the contents of total nitrogen(TN)and available nitrogen(AN)decreased significantly from 1.91 g·kg^(-1) and 138.48 mg·kg^(-1) to 0.55 g·kg^(-1) and 25.39 mg·kg^(-1),respectively,in the 0-100 cm soil layer with the increase in soil depth.Spatially,the contents of TN and AN in each soil layer had a similar spatial distribution pattern,which showed an increasing trend from the central to the northeast and southwest.There was no significant difference in the contents of TN and AN of each soil layer between rice-vegetable rotation land and rice-wheat/rapeseed rotation land,while the contents of TN and AN in the surface layer(0-20 cm)of afforested land were 11.23%-15.78% lower than those of the other two land uses(P<0.05).Compared with soils formed from Q4 gray alluvium,soils formed from Q3 old alluvium had 1.12-1.19 times of TN and AN content in 0-40 cm soil layer(P<0.05)and 0.89 times of TN content in>60-100 cm soil layer(P<0.05),while the contents of TN and AN in the 0-40 cm soil layer of soils formed from Q4 gray-brown alluvium were 1.14-1.21 times as those in the Q4 gray alluvium(P<0.05).There were no significant differences in the contents of TN and AN under different land uses in each layer of Q3 old alluvium developed soil(P>0.05).For afforested land,soils formed from Q4 grey alluvium and Q4 grey-brown alluvium in afforested land had lower TN and AN content in the topsoil than the other two land use types,but had higher TN and AN content below the>20-40 cm soil layer.The above results suggest that the profile distribution characteristics of soil nitrogen are affected by agricultural land use types and such effects are controlled by soil parent material.
作者
冉敏
宋靓颖
薛晶玲
张元媛
张浩
吴德勇
李启权
RAN Min;SONG Liang-ying;XUE Jing-ling;ZHANG Yuan-yuan;ZHANG Hao;WU De-yong;LI Qi-quan(College of Resources,Sichuan Agricultural University,Chengdu 611130,China)
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2024年第3期398-407,共10页
Journal of Ecology and Rural Environment
基金
四川省自然科学基金(2022NSFSC0104)。
关键词
土壤氮素
土壤剖面
空间分布
农地利用方式
成土母质
soil nitrogen
soil profile
spatial distribution
agricultural land use mode
soil parent material
