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土壤动物在农田生态系统腐屑食物网中占有重要地位 ,它们参与土壤有机质分解、植物营养矿化及养分循环作用 .国内外许多研究表明 ,土壤动物对全球变化 ,尤其是大气CO2 浓度升高能够产生正向、中性和负向的影响 .土壤线虫是这类土壤动物的典型代表 ,因为它们在大多数土壤中分布是丰富的 ,而且营养类群是多样的 .应用自由空气CO2 浓度增高 (FACE)技术设计 3个处理水稻圈暴露在大气CO2 增高(浓度为 5 70 μmol·mol-1)条件下 ,3个对照水稻圈为环境中的CO2 浓度 (370 μmol·mol-1) .在中国无锡稻田生态系统水稻生长期内 ,本项研究监测了 0～ 5cm和 5～ 10cm土层中线虫营养类群 .研究结果显示 ,线虫总数、食细菌线虫、植物寄生线虫、杂食 捕食类线虫在取样深度和取样日期上存在显著差异 ;在整个取样日期中 ,FACE处理 5～ 10cm深度中线虫总数、食细菌线虫数量比对照中的高 ;在 0～ 5cm深度中 ,FACE处理食细菌线虫数量比对照中的高 ,而杂食 捕食类线虫数量则表现出相反的趋势 .食真菌线虫在FACE处理与对照之间也存在极显著差异 .
Soil fauna occupies an important place in the food ecosystem of farmland ecosystems and they are involved in the decomposition of soil organic matter, mineralization and nutrient cycling in plants.Many researches at home and abroad show that soil fauna can enhance the global climate change, especially the atmospheric CO2 concentration Neutral and negative effects Soil nematodes are typical representatives of this type of soil fauna because they are abundant in most soils and are diverse in nutrient groups and are exposed to elevated free-air CO 2 concentrations (FACE ) Technical design Three rice rings exposed to atmospheric CO 2 concentration (370 μmol · mol-1) were exposed to elevated CO2 (5 70 μmol · mol-1) Rice paddy ecosystem During the growth of rice, the study monitored the nematode nutrition groups in 0 ~ 5cm and 5 ~ 10cm soil layers.The results showed that the total number of nematodes, bacteria-eating nematodes, plant parasitic nematodes, omnivorous nematodes at the sampling depth and There was a significant difference in the sampling date; in the whole sampling date, the total number of nematodes in the depth of 5 ~ 10cm was treated by FACE compared with the control .In the depth of 0-5 cm, the number of nematodes fed by FACE was higher than that of the control, while the number of omnivorous predators showed the opposite trend. There was also a significant difference between FACE and control .