免耕对农田土壤团聚体的影响研究:Meta分析  被引量:2

Effect of No-tillage on Soil Aggregates in Farmland:A Meta Analysis

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作  者:徐艺萍 饶越悦 孟艳 温媛 孟维伟[1] 王旭清[1] 李宗新[1] 刘开昌[1] 代红翠 XU Yi-ping;RAO Yue-yue;MENG Yan;WEN Yuan;MENG Wei-wei;WANG Xu-qing;LI Zong-xin;LIU Kai-chang;DAI Hong-cui(National Engineering Research Center of Wheat and Maize,Shandong Academy of Agricultural Science,Jinan 250100,China;College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China)

机构地区:[1]山东省农业科学院小麦玉米国家工程研究中心,济南250100 [2]中国农业大学农学院,北京100193

出  处:《环境科学》2024年第2期952-960,共9页Environmental Science

基  金:国家自然科学基金项目(32001487);山东省青年科技人才托举工程项目(SDAST2021qt04);山东省农业科学院农业科技创新工程项目(CXGC2022E01,CXGC2021B08,CXGC2021C03)。

摘  要:为明确免耕对农田土壤团聚体的影响,通过Meta分析整合已发表的116项研究,综合探究免耕对土壤团聚体粒径分布、平均重量直径(MWD)以及团聚体有机碳含量的影响.结果表明,与耕作相比,免耕显著提高土壤大团聚体占比(10.9%)和MWD(12.8%),减少黏粉粒占比(-15.5%),但对微团聚体及团聚体有机碳含量没有显著影响.亚组分析表明,免耕显著提高西北地区土壤大团聚体占比(17.6%),提高华北地区土壤团聚体MWD(15.4%);在旱地及黏壤土中,免耕分别提高团聚体MWD效应值12.6%和18.4%;免耕提高大团聚体占比的效果随土壤pH值增加而增加;秸秆还田条件下,免耕显著提高土壤大团聚体占比(9.6%)及MWD(11.6%),秸秆移除后,免耕对团聚体的影响效应均不显著;在试验年限方面,短期免耕(<5 a)显著提高土壤大团聚体比例,而长期免耕(>10 a)提高团聚体MWD;在土壤深度方面,免耕仅能改善耕层(0~20 cm)土壤团聚体粒径分布及MWD,而对深层土壤(>20 cm)团聚体没有影响.综上所述,免耕能够改善土壤团聚体粒径分布及稳定性,但对团聚体碳含量无显著影响.在实际生产中,要充分考虑生产区域、土壤性质和田间管理等因素,以达到有效改良土壤团聚体的目的.In order to clarify the impact of no-tillage on the quality of farmland soil aggregates in China and promote the adaptive application of no-tillage practices,a Meta-analysis was conducted by collecting data from 116 published studies.The effects of no-tillage on aggregate size distribution,mean weight diameter(MWD),and aggregate-associated C were studied.The results showed that compared with that under tillage,no-tillage significantly increased the proportion of macroaggregates(10.9%)and MWD(12.8%)and decreased the proportion of clay and silt(-15.5%)but had no significant effect on soil microaggregate and aggregate-associated C.The subgroup and Meta regression analysis showed that notillage significantly increased the proportion of macroaggregates in Northwest China(17.6%)and MWD in North China(15.4%).In upland and clay loam,no-tillage increased MWD by 12.6% and 18.4%,respectively.The effect of no-tillage on increasing the proportion of macroaggregates increased with the soil pH.When straw returned,no-tillage significantly increased the proportion of macroaggregates(9.6%)and MWD(11.6%),but no significant effect of no-tillage on aggregates was found after straw removal.Regarding test duration,short-term(<5 a)no-tillage could significantly increase the proportion of macroaggregates,whereas long-term(>10 a)no-tillage could improve the MWD.In different soil layers,no-tillage could only significantly improve the aggregate size distribution and MWD in topsoil(0-20 cm)but had no effect in subsoil(>20 cm).In summary,no-tillage could improve aggregate size distribution and stability but had no effect on aggregate-associated C.Production region,soil properties,field management methods,and other factors should be fully considered in production practice to effectively improve the quality of soil aggregates.

关 键 词:免耕 土壤团聚体 平均重量直径(MWD) 团聚体有机碳 META分析 

分 类 号:X144[环境科学与工程—环境科学]

 

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