不同土地利用方式下土壤动物对凋落物的分解作用及影响因素
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贵州大学农学院

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国家自然科学基金(41807055);贵州省科技厅项目 (黔科合后补助[2020]3001)


Contributions and Influencing Factors of Soil Fauna to Litter Decomposition under Different Land-use Patterns
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Guizhou University College of Agriculture

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National Natural Science Foundation of China (Nos. 41807055) and Project of Guizhou Provincial Department of science and technology (Nos. [2020]3001)

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    摘要:

    土壤动物通过掘穴、取食等活动对凋落物分解起着重要作用。除凋落物本身质量外,气候因子是影响土壤动物对凋落物分解的重要外界因素。然而,目前尚不清楚不同土地利用方式下土壤动物在凋落物分解中的贡献大小是否具有差异,以及气候因子对这一过程的调控作用是否相同?本文运用Meta分析方法,量化土壤动物群对凋落物分解率的影响大小,提取了中国地理范围内56篇文献的308条研究(检索论文发表时间截止2021年5月31日),研究气候因子调控不同土地利用方式下土壤动物对凋落物分解速率的影响。结果表明,土壤动物平均增加了8.10%凋落物的分解。在林地、草地和耕地等不同土地利用方式间,土壤动物对凋落物分解的促进作用均达显著水平(P < 0.01),其中在耕地的促进作用最强(12.36%)。土壤动物对凋落物分解的效应值与温度、降雨量、海拔、凋落物袋尺寸、试验时长等因素相关。在林地,土壤动物的效应值随低温月(1月)、高温月(7月)平均温度及年均温的增加显著增加(P < 0.01);在草地,土壤动物效应值与低温月、高温月平均温度及年均温的相关关系均不显著(P > 0.05),但却表现出随低温月、高温月平均温度及年均温的增加降低的趋势。土壤动物对凋落物分解的效应值与年降水量正相关,与海拔负相关。此外,随凋落物袋尺寸的增加和试验时长的增长,土壤动物对凋落物分解的效应值分别表现出增加和降低的趋势(P < 0.01)。

    Abstract:

    [Objective] Soil fauna play an important role in litter decomposition processes through activities such as burrowing and feeding. Besides the quality of litter, climate parameters have been identified as major factors affecting the role of soil fauna on litter decomposition. However, the contribution of soil fauna in litter decomposition and the role of climatic parameters under different land-use patterns are still not clear. [Method] In this paper, meta-analysis was used to quantify the effect sizes of soil fauna on litter decomposition rates. We established a meta-analysis database by collecting the results of 56 publications both in Chinese and English in China from papers published until May 31, 2021. The effect size of soil fauna on litter decomposition rates among three different land-use patterns (i.e., forest, grassland, and farmland), was further tested by a random-effects model. Correlations were tested between environmental factors - temperature, precipitation, litterbag size, latitude, and experimental duration – and the effect size of soil fauna on litter decomposition rates. [Result] Soil fauna increased litter decomposition rate by an average of 8.10%, reaching a significant level among different land-use patterns. Among the three different land-use patterns, the effect of soil fauna on litter decomposition rates was strongest in the farmland (12.36%). Environmental factors were closely correlated with the effect size of soil fauna on litter decomposition rates. [Conclusion] In the forest, effect size significantly increased with temperature, including the average temperature in January and July, and the mean annual temperature (P < 0.01). In grassland, however, the effect size of soil fauna decreased with temperature (P > 0.05). The effect size significantly increased with mean annual precipitation but significantly decreased with altitude (P < 0.01). Besides, with the increase of litterbag size and experimental duration, the effect size values of soil fauna on litter decomposition significantly increased and decreased, respectively.

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袁访,宋理洪,邓承佳,唐静.不同土地利用方式下土壤动物对凋落物的分解作用及影响因素[J].土壤学报,,[待发表]
yuanfang, SONG Lihong, DENG Chengjia, TANG Jing. Contributions and Influencing Factors of Soil Fauna to Litter Decomposition under Different Land-use Patterns[J]. Acta Pedologica Sinica,,[In Press]

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