生物多样性 ›› 2022, Vol. 30 ›› Issue (12): 22189.  DOI: 10.17520/biods.2022189

所属专题: 土壤生物与土壤健康

• 研究报告 • 上一篇    下一篇

紫色土线虫对长期不同施肥措施的响应

胡惠玲1, 姚致远2, 高世斌1,*(), 朱波2   

  1. 1.四川农业大学玉米研究所, 成都 611130
    2.中国科学院山地表生过程与生态调控重点实验室/中国科学院水利部成都山地灾害与环境研究所, 成都610041
  • 收稿日期:2022-04-14 接受日期:2022-06-27 出版日期:2022-12-20 发布日期:2022-09-29
  • 通讯作者: *E-mail: shibingao@163.com
  • 基金资助:
    中国科学院水利部成都山地灾害与环境研究所青年科学研究基金(SDS-QN-2101);国家自然科学基金(42007100);中国科学院特别研究助理资助和四川省博士后专项资金

Nematode response to long-term fertilization in purple soil

Huiling Hu1, Zhiyuan Yao2, Shibin Gao1,*(), Bo Zhu2   

  1. 1. Maize Research Institute of Sichuan Agricultural University, Chengdu 611130
    2. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences/Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041
  • Received:2022-04-14 Accepted:2022-06-27 Online:2022-12-20 Published:2022-09-29
  • Contact: *E-mail: shibingao@163.com

摘要:

土壤线虫在农田生态系统中数量丰富且对土壤环境变化敏感, 可用于评估不同田间管理条件下的土壤健康。本文探究了紫色土区长期不同施肥措施及土壤团聚体粒径对线虫群落的分布及其生态功能多样性的影响。试验设置了5个施肥处理: 不施肥(对照, CK)、单施化肥(NPK)、生物炭 + 化肥(BCNPK)、商品猪粪 + 化肥(OMNPK)和秸秆 + 化肥(RSDNPK)。团聚体粒径分为: 原状土(BS)、大团聚体(> 2 mm; LA)和小团聚体(0.25-2 mm; SA)。结果表明, 与对照相比, 施肥可促进线虫数量增长, 其中单施化肥处理下增幅最小(66%); 有机物料与化肥配施对线虫数量的提升更为显著, 秸秆 + 化肥处理下增幅达206%。不同施肥处理间线虫类群相对丰度差异显著, 大小均表现为: 食细菌线虫(BA) > 杂食/捕食线虫(OP) > 植食线虫(PP) > 食真菌线虫(FU)。小团聚体较其他土壤团聚体的杂食/捕食线虫丰度更低, 食细菌线虫丰度较高。秸秆与化肥配施处理下线虫群落结构指数和富集指数显著增加, 且各施肥处理下线虫功能足迹呈现明显差异。有机肥与化肥配施(尤其是秸秆 + 化肥)可提高土壤养分供应且有利于形成稳定健康的土壤生态系统, 助推区域农业的可持续发展。

关键词: 土壤线虫, 优化施肥, 土壤团聚体, 多样性, 土壤食物网

Abstract

Aims: Soil nematodes are abundant in agroecosystems and are sensitive to edaphic environmental changes, they can be used to assess soil health under different field management conditions. This study aims to investigate the effects of long-term fertilization and soil aggregation patterns on nematode community distribution and functional diversity in purple soil.
Methods: Five fertilization treatments were established: no fertilizer (control, CK), chemical fertilizer alone (NPK), biochar + chemical fertilizer (BCNPK), commercial pig manure + chemical fertilizer (OMNPK) and straw + chemical fertilizer (RSDNPK). Soil particle sizes were categorized as: bulk soil, large macroaggregates (> 2 mm) and small macroaggregates (0.25-2 mm).
Results: Fertilization increased the number of soil nematodes compared to the CK with a minimum increase of 66% under the NPK treatment group. Soil treated with a combination of organic and chemical fertilizers exhibited an increase in nematode abundance of 206%. The relative abundance of nematode groups was consistent across treatments: bacterivores > omnivores/predators > plant parasites > fungivores. However, omnivores/predators and bacterivores populations in small macroaggregates were smaller and larger, respectively, than populations associated with other soil particle categories. Community structure and enrichment index values increased in the RSDNPK group, and the nematodes’ functional footprint varied across treatments.
Conclusions: The application of a combination of organic and chemical fertilizers (especially RSDNPK) can increase soil nutrient supply capacity and help establish stable and healthy soil ecosystems, supporting the development of sustainable local agriculture.

Key words: soil nematode, optimizing fertilization, soil aggregates, diversity, soil food web