The Effect Of Tillage Regime And Fertilization Management On Soil Arthropod Community In Huang Huai-hai Plain, China

Agriculture has been identified as one of the largest contributors to the loss of biodiversity worldwide because of the large land area designated to this practice. The effect of agricultural managements such as tillage regimes and fertilizations on soil arthropod community was studied, the results showed that:(1) The effect of tillage regimes and straw returning on soil arthropod community were significant, no-tillage increased Shannon-Weiner diversity index (H') when compared with tillage treatment. Straw returning increased Simpson domination index (D), while Pilou evenness index (Js) was on the contrary. Patrick richness index (R) was elevated with increased straw returning. The effect of tillage regime on soil arthropod community was mainly indirect and presented that tillage regime was significantly interacted with soil layer and straw returning.Onychiurus armatus benifited from no-tillage plus straw returning, while tillage practices and concurrent straw returning intensively simulated Proisotoma minuta and Lepidocyrtus pallidus. No-tillage increased the population density of Folsomides famarensis and Folsomides parvulus, especially for Sminthurinus sp. and Bourletiella sp., while Pongeiella sp. had a higher population density in tillage plots compared with no-tillage plots. Oribatida was not significantly correlated with tillage regime or straw returning, while tillage plus straw returning increased Mesostigmata. Prostigmata had a higher density in no-tillage plots than tillage plots, but was little correlated with straw returning.(2) The richness and diversity indices of soil arthropod community were significantly impacted by fertilization treatments. Simpson domination index was increased in NK and OM treatment plots, while decreased in PK treatment plots. Pilou evenness in CK treatment plots was significantly increased and was also improved in PK and NK treatment plots, but it was contrary in OM treatment plots. The diversity of soil arthropod community (DG index) was the highest in OM and OMNPK treatment plots and the lowest in NK treatment plots. DG index was not significantly increased in NPK treatment plots.Population density of Onychiurus armatus and Folsomides famarensis was significantly increased by OM and OMNPK treatments. Three suborders (Oribatida, Mesostigmata and Prostigmata) of acari were all well correlated with NPK and OMNPK treatments, especially, Oribatida had a high population density in NPK and OMNPK treatment plots. Both of Oribatida and Prostigmata were little correlated with OM treatment. NK treatment had a very low population density of soil arthropod community, and a lower population density of collembolan even presented in NK plots than CK plots. Applied nitrogen fertilizer negatively impacted Onychiuridae, while positively impacted Oribatida. Increased Oribatida was limited when applied nitrogen fertilizer was higher than 250 kg N·hm-2, and both of Mesostigmata and Prostigmata was increased by applied nitrogen fertilizer at a certain extent, but were intensively constrained when higher than 230 kg N·hm-2.