免耕对农田土壤团聚体的影响研究:Meta分析 |
摘要点击 1233 全文点击 191 投稿时间:2023-03-16 修订日期:2023-05-04 |
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中文关键词 免耕 土壤团聚体 平均重量直径(MWD) 团聚体有机碳 Meta分析 |
英文关键词 no-tillage soil aggregates mean weight diameter (MWD) aggregate-associated SOC Meta analysis |
作者 | 单位 | E-mail | 徐艺萍 | 山东省农业科学院小麦玉米国家工程研究中心, 济南 250100 中国农业大学农学院, 北京 100193 | xuyiping9703@163.com | 饶越悦 | 山东省农业科学院小麦玉米国家工程研究中心, 济南 250100 中国农业大学农学院, 北京 100193 | | 孟艳 | 山东省农业科学院小麦玉米国家工程研究中心, 济南 250100 | | 温媛 | 中国农业大学农学院, 北京 100193 | | 孟维伟 | 山东省农业科学院小麦玉米国家工程研究中心, 济南 250100 | | 王旭清 | 山东省农业科学院小麦玉米国家工程研究中心, 济南 250100 | | 李宗新 | 山东省农业科学院小麦玉米国家工程研究中心, 济南 250100 | | 刘开昌 | 山东省农业科学院小麦玉米国家工程研究中心, 济南 250100 | liukc1971@126.com | 代红翠 | 山东省农业科学院小麦玉米国家工程研究中心, 济南 250100 | daihongcui2013@163.com |
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中文摘要 |
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. |
英文摘要 |
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 no-tillage 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. |