title: Effect of long-term combined application of organic and inorganic fertilizers on soil nematode communities within aggregates.
abstract: A long-term fertilization experiment was conducted to examine the effects of different fertilization practices on nematode community composition within aggregates in a wheat-maize rotation system. The study was a randomized complete block design with three replicates. The experiment involved the following four treatments: no fertilizer, inorganic N, P and K fertilizer (NPK), NPK plus manure (NPKM) and NPK plus maize straw (NPKS). Soil samples were taken at 0-20 cm depth during the wheat harvest stage. Based on our results, NPKS contributed to soil aggregation and moisture retention, with a positive effect on soil total nitrogen accumulation, particularly within small macroaggregates (0.25-1 mm) and microaggregates (<0.25 mm). The C/N ratio was correlated to the distribution of the soil nematode community. Both manure application and straw incorporation increased the nematode functional metabolic footprints within all aggregates. Additionally, the functional metabolic footprints decreased with a decline in aggregate size. The accumulation of total nitrogen within <1 mm aggregates under NPKS might play a key role in maintaining the survival of soil nematodes. In our study, both crop straw incorporation and inorganic fertilizer application effectively improved soil physicochemical properties and were also beneficial for nematode survival within small aggregate size fractions.
authors: Liaoning Key Laboratory of Soil Environmental Quality and Agro-product Safety, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.|College of Land and Environment, Shenyang Agricultural University, Shenyang 110161, China.
authors: Zhiyong
authors: Z
authors: Zhang
authors: Liaoning Key Laboratory of Soil Environmental Quality and Agro-product Safety, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
authors: Xiaoke
authors: X
authors: Zhang
authors: Liaoning Key Laboratory of Soil Environmental Quality and Agro-product Safety, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
authors: Md
authors: M
authors: Mahamood
authors: Institute of Plant Nutrition and Environmental Resources Science, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China.
authors: Shuiqing
authors: S
authors: Zhang
authors: Institute of Plant Nutrition and Environmental Resources Science, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China.
authors: Shaomin
authors: S
authors: Huang
authors: Liaoning Key Laboratory of Soil Environmental Quality and Agro-product Safety, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
authors: Wenju
authors: W
authors: Liang
mesh_terms: D000818:Animals; D005308:Fertilizers; D009348:Nematoda / Q000502:physiology*; D012987:Soil / Q000737:chemistry*
chemical_list: D005308:Fertilizers; D012987:Soil