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首页> 外文期刊>Paddy and Water Environment >Effects of detritivorous invertebrates on the decomposition of rice straw: evidence from a microcosm experiment
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Effects of detritivorous invertebrates on the decomposition of rice straw: evidence from a microcosm experiment

机译：减少无脊椎动物对稻草分解的影响：来自微观微观实验的证据

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Decomposition of crop residues is a key process in agricultural systems that influences nutrient cycling and productivity. To clarify the roles of different groups of invertebrates in decomposition in paddy fields, we conducted a microcosm experiment, testing the effects of soil eluate filtered through a 21 mu m mesh (control treatment) against the effects of microfauna (& 0.1 mm) and small gastropods (juvenile golden apple snails (Pomacea canaliculata), ca. 2 mm shell diameter), both separately and in combination, on rice straw decomposition. Rice straw in litterbags was incubated at the soil surface and in the soil together with standardized amounts of the respective detritivores for 10 and 21 days. Compared to the control treatment, snails and microfauna enhanced the reduction in straw mass on the soil surface by 19 and 22%, respectively. Both groups combined increased the reduction in straw biomass by 30%. Below the soil surface, the contribution of detritivores to decomposition was smaller, reducing straw biomass by just 1% (snails), 11% (microfauna) and 14% (snails + microfauna) compared to the control. The effects of microfauna and snails on decomposition were not fully additive, a pattern that could be due to competition or trophic interactions. Model selection using Akaike's information criterion on nested linear mixed effects models led to a model including the main effects (snails, microfauna, position and time), several two-way interactions and the three-way interaction snails * microfauna * litterbag_position as the most parsimonious description of the data. Keeping straw accessible to aquatic invertebrate detritivores should be a suitable management strategy to enhance decomposition in paddy fields, although trade-offs with other management issues such as pest control need to be considered.
机译：作物残留物的分解是农业系统的关键过程，影响营养循环和生产率。为了澄清不同群体无脊椎动物在稻田中分解中的作用，我们进行了一种微观的实验，测试了土壤洗脱液通过21μm网状（对照处理）的影响，以抵御Microfauna（＆amp; 0.1mm; 0.1mm; 0.1 mm的效果）和小型胃脂（少年金苹果蜗牛（Pomacea canaliculata），Ca.2 mm壳体直径），既单独和组合，稻草分解。将稻草在土壤表面和土壤中孵育在土壤表面和土壤中，与标准化量的相应DetRitVivors进行10和21天。与对照治疗相比，蜗牛和微荷松分别增强了土壤表面上的稻草质量减少19％至22％。两组两组将秸秆生物质的减少增加30％。在土壤表面下方，与对照相比，秸秆生物量减少，减少了仅1％（蜗牛），11％（MicroFauna）和14％（蜗牛+ Microfauna）的秸秆生物质。 Microfauna和蜗牛对分解的影响不是完全添加剂，这是由于竞争或营养互动的模式。模型选择使用Akaike的信息标准对嵌套线性混合效果模型导致了一个模型，包括主要效果（蜗牛，微框，位置和时间），几种双向交互和三通交互蜗牛* microfauna * litterbag_position是最具典范的数据描述。保持水生无脊椎动物的吸管应该是加强稻田中的分解的合适管理策略，尽管需要考虑与其他管理问题等其他管理问题的权衡。

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