粪肥施用对土壤团聚体的影响——Meta分析

Responses of Soil Aggregates to Manure Application: A Meta-analysis

摘要:

粪肥施用为土壤输入大量有机质与养分，能影响土壤团聚体的形成和稳定性，大部分研究主要认为粪肥施用促进土壤大粒径团聚体的形成(marcoaggregate，≥0.25 mm)，但进一步细分是对大团聚体(large marcoaggregate，>2 mm)还是小团聚体(small marcoaggregate，2 ~ 0.25 mm)的影响更大，研究存在较大差异。本文使用Meta分析收集了36篇相关文献，共267个团聚体数据，发现施用粪肥能显著增加土壤大团聚体和小团聚体含量，分别增加了95% 和17%，同时减少了土壤微团聚体(microaggregates，0.25 ~ 0.053 mm)和土壤粉黏颗粒(silt-plus and clay-size particles，<0.053 mm)含量，分别减少了14% 和20%。本文还从土壤因素、粪肥因素、气候因素3个角度的解释变量来分析粪肥施用对土壤团聚体影响不同的原因，结果发现土壤类型、土壤pH、粪肥种类和年均气温、年均降水量是造成不同研究结果差异的主要原因。

Abstract:

Manure application can affect the formation and stability of soil aggregates by increasing the amount of organic matter and nutrients in soil. Most studies found that manure application increased the proportion of soil marcoaggregates (≥0.25 mm). However, there are significant differences among studies in the results that manure application affect large marcoaggregates (>2 mm) more or small marcoaggregates (2–0.25 mm). A Meta-analysis based on 36 studies with 267 aggregate data was conducted and found that manure application significantly increased the proportion of soil large macroaggregates and small marcoaggregate by 95% and 17%, respectively. At the same time, it reduced the proportion of soil microaggregates (0.25–0.053 mm) and silt-plus and clay-size particles (<0.053 mm) by 14% and 20%, respectively. What’s more, Meta-regression analyze found that soil types and pH, manure types, annual temperature, and annual rainfall are the main factors affecting the responses of soil aggregates to manure application.