沼渣施用对土壤线虫群落结构的影响

发布时间：2018-09-06 20:15

【摘要】：为了解沼渣施用对土壤生物环境的影响,以土壤线虫为指示工具,通过盆栽试验对比沼渣(BR)、有机肥(OR)、化肥(CF)和不施肥(CK)4个处理下土壤线虫群落结构,评估不同施肥对土壤健康的影响,结果表明:沼渣可极大地刺激r-策略线虫的增长,使得线虫总数高出其他处理。各处理共获得线虫22个属,以食细菌线虫的种类和比例最高,然而不同处理食细菌线虫功能群的组成差异较大,沼渣处理几乎全部为cp值为1的小杆科线虫,有机处理cp1和cp2线虫比例相当,化肥和对照处理则主要是cp2的线虫。植食性线虫在沼渣处理中受到了明显的抑制。利用线虫群落评价不同施肥后的土壤状况,发现施用沼渣的土壤最优,食物网呈结构化,土壤养分富集;而化肥和不施肥对照土壤则表现出一定胁迫的状态。
[Abstract]:In order to understand the effect of biogas residue application on soil biological environment, soil nematode community structure was compared under four treatments of biogas residue (BR), organic fertilizer, (OR), (CF), and no fertilizer (CK), using soil nematode as indicator tool. The effects of different fertilization on soil health were evaluated. The results showed that the biogas residue could greatly stimulate the growth of r-strategy nematodes and make the total number of nematodes higher than other treatments. A total of 22 genera of nematodes were obtained from each treatment. The species and proportion of bacteriophagous nematodes were the highest. However, the composition of functional groups of bacteriophagous nematodes in different treatments varied greatly, and the biogas residue treatments were almost all small nematodes with cp value of 1. The proportion of cp1 and cp2 nematodes in organic treatment was the same, while that in chemical fertilizer and control treatment was mainly the nematodes of cp2. Phytophagous nematodes were significantly inhibited in the treatment of biogas residue. The nematode community was used to evaluate the soil condition after different fertilization. The results showed that the soil with biogas residue was the best, the food web was structured and the soil nutrient was enriched, while the fertilizer and non-fertilization control soil showed a certain stress state.
【作者单位】：北京市农林科学院植物营养与资源研究所;北京市缓控释肥料工程技术研究中心;中国农业大学资源与环境学院/生物多样性与有机农业北京市重点实验室;
【基金】：北京市农林科学院青年科研基金(QNJJ201612) 国家科技支撑计划课题(2015BAL01B04-03,2014BAD24B02-2-1) 科技部支撑计划课题(2012BAD14B01)
【分类号】：S141;S154.386

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