Wheat cover crop promoted cucumber seedling growth through regulating soil nutrient resources or soil microbial communities?
Wheat cover crop promoted cucumber seedling growth through regulating soil nutrient resources or soil microbial communities?
复制标题
小麦覆盖作物通过调节土壤养分资源或土壤微生物群落促进黄瓜幼苗生长？
DOI：
10.1007/s11104-017-3307-9
复制
发表时间：
2017-09-01
期刊：
影响因子：
4.9
通讯作者：
Wu, Fengzhi
中科院分区：
文献类型：
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作者：
Gao, Danmei;Zhou, Xingang;Wu, Fengzhi
背景与目的虽然在集约化蔬菜生产系统中经常观察到覆盖作物的生物量和产量增加，但对驱动这种刺激作用的机制的了解仍然很少。方法通过1）添加养分来平衡种植小麦引起的土壤养分差异，2）添加活性炭，残渣洗涤和燃烧以去除次生代谢物，研究小麦覆盖作物对黄瓜幼苗生长的影响。 小麦根系分泌物和凋落物分解，3）土壤灭菌和土壤生物接种，验证小麦对土壤生物群变化的作用。结果小麦覆盖作物增加了黄瓜幼苗生长和植株N、P、K浓度，但降低了土壤速效N、P、K、Mn和B含量。消除土壤养分差异、去除次生代谢产物、对土壤进行消毒后，黄瓜幼苗生长下降。土壤生物群对黄瓜幼苗生长呈正反馈效应。小麦覆盖作物增加了土壤细菌和真菌群落的多样性，改变了假单胞菌的结构和组成，降低了芽孢杆菌和假单胞菌的丰度。结论小麦覆盖作物通过改变土壤养分有效性、调节土壤微生物群落多样性来促进黄瓜幼苗生长。
Background and aimsAlthough biomass and yield increase of plant following cover crops is often observed in intensive vegetable production systems, clear understanding of the mechanisms driving such stimulatory effects is still poor.MethodsEffects of wheat cover crop on cucumber seedling growth were studied by 1) adding nutrients to balance difference in soil nutrients caused by planting wheat, 2) adding activated carbon, residue washing and burning to remove secondary metabolites from root exudates and litter decomposition of wheat, 3) soil sterilization and soil biota inoculation to validate the role of changes in soil biota induced by wheat.ResultsWheat cover crop increased cucumber seedling growth and plant N, P and K concentrations, but decreased soil available N, P, K, Mn and B contents. Cucumber seedling growth decreased after eliminating the difference in soil nutrients, removing secondary metabolites and sterilizing soils. Feedback effects of soil biota on cucumber seedling growth were positive. Wheat cover crop increased the diversity of soil bacterial and fungal community, changed the structure and composition ofPseudomonasspp., and decreased the abundances ofBacillusandPseudomonasspp.ConclusionsWheat cover crop promoted cucumber seedling growth by changing soil nutrient availability and regulating soil microbial community diversity.