球囊霉素在土壤团聚体中的分布特征及影响因素的Meta分析

Distribution Characteristics and Influencing Factors of Glomalin in Soil Aggregates:A Meta-Analysis

为充分认识球囊霉素在维持土壤有机碳平衡和土壤团聚体稳定性中的重要作用,建立改善土壤结构和提升土壤质量的管理策略,通过收集整理近些年来已发表的19篇文献中的332组数据,定量分析球囊霉素在不同粒径土壤团聚体中的分布特征,系统解析其影响因素,并比较了不同土地利用方式下球囊霉素在土壤团聚体中的分配差异。结果表明:无论总球囊霉素还是易提取球囊霉素,在大团聚体(>2000μm)和小团聚体(2000~250μm)中的质量百分比(分别约占30%)均显著高于微团聚体(250~53μm)和黏粉粒级微团聚体(<53μm)(分别约占15%)。易提取球囊霉素占总球囊霉素的比例在粉黏粒级微团聚体(<53μm)中更低,约为20%,其他粒径均在30%以上。球囊霉素中碳占土壤有机碳的比例在各团聚体中无显著差异,不同粒径团聚体中易提取球囊霉素约占有机碳的2%左右,而总球囊霉素约占有机碳的8%左右。大于250μm团聚体中球囊霉素随温度和降水的增加而增加,而随着pH的升高而降低。在小于250μm团聚体中未发现显著相关性,但发现球囊霉素随土壤有机碳增加而增加,呈显著正相关。通过比较不同利用方式的土壤,本研究还发现林地土壤各粒径团聚体中的球囊霉素均不低于耕地和草地土壤,说明林地土壤较其他类型土壤更有利于球囊霉素的积累。

【Objective】This study aimed to understand the role of glomalin in maintaining soil organic carbon(SOC)balance and soil aggregate stability,and construct management strategies for improving soil structure and soil quality.【Method】To fully understand glomalin,published data in recent years(332 sets of data from 19 literature)were collected,the distribution characteristics of glomalin in soil aggregates were quantitatively analyzed,and its influencing factors were systematically analyzed.Moreover,the distribution of glomalin in soil aggregates under different land uses was compared.【Result】The results showed that the mass percentages of the>2000μm and 2000-250μm aggregates(about 40%,respectively)were significantly higher than that of the 250-53μm aggregates(about 20%).The proportion of easily extractable glomalin in total glomalin was 20%in<53μm aggregates,which was lower than other particle sizes(>30%).There was no significant difference in the glomalin-C in SOC in different aggregates.The proportion of easily extractable glomalin-C in aggregates of different particle sizes was about 2%,while the proportion of total glomalin-C was about 8%.【Conclusion】In the>250μm aggregates,GRSP(glomalin related soil protein)increased with the increase of temperature and precipitation,but decreased with the increase of pH.Although these correlations were not found in<250μm aggregates,there was a significant positive correlation between glomalin and SOC.By comparing different land use patterns,it was found that the glomalin in the aggregates of forest soil was more than those in farmland and grassland,which indicated that forest soil was more conducive to the accumulation of glomalin than farmlands and grasslands.