干旱区研究

Arid Zone Research >

2021 , Vol. 38 >Issue 4: 973 - 979

DOI: https://doi.org/10.13866/j.azr.2021.04.08

Soil Resources

Effects on soil aggregate composition and stability under various fertilization regimes of defective forest land in a sandy soil area

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  • 1. Key Laboratory of Degraded and Unused Land Consolidation Engineering, Land Engineering Technology Innovation Center, Ministry of Natural Resources, Xi’an 710021, Shaanxi, China
    2. Shaanxi Key Laboratory of Land Consolidation, Xi’an 710064, Shaanxi, China
    3. Weinan Agricultural Technology Extension Centre, Weinan 714000, Shaanxi, China

Received date: 2021-01-07

  Revised date: 2021-03-01

  Online published: 2021-08-03

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Abstract

To evaluate the stability of soil aggregates in cultivated land improvements in sandy soil areas, an experimental field was set up in the remnant forest land improvement project area of Jingbian County, Yulin, northern Shaanxi, China. The orthogonal experiment scheme [L9(34)] was used to analyze the effects of different fertilizer types and application rates on soil aggregates. The results showed that compared to non-fertilized farmland soil, the combined application of N fertilizer and organic fertilizer can increase the content of water-stable macro-aggregates. Among them, the content of water-stable macro-aggregates larger than 2 mm was relatively higher when applying the T7 treatment (421.34 kg·hm-2 urea, no P fertilizer, 125 kg·hm-2 potassium chloride, and 7.5 t·hm-2 organic fertilizer) than T1 (no N, P, or K fertilizer, and organic fertilizer), T2 (no N fertilizer, 333.33 kg·hm-2 superphosphate, 62 kg·hm-2 potassium chloride, 7.5 t·hm-2 organic fertilizer), and T3 (no N fertilizer, 675 kg·hm-2 superphosphate, 125 kg·hm-2 potassium chloride, 15 t·hm-2 organic fertilizer). The contents of macro-aggregates over 2 mm were 470.15%, 360.24% and 210.57%, respectively. The quantity distributions when the cumulative content of soil aggregates were 10%, 30%, 60% were D10, D30, D60, respectively. The mean weight diameter, geometric mean diameter, and the soil structure coefficient all had a significant influence, with water-stable large aggregates >2 mm and 0.25-2 mm having obvious promoting effects. The soil structure coefficient (Kctp) of T3, T4 (198.28 kg·hm -2 urea, no P fertilizer, 62 kg·hm-2 potassium chloride, and 15 t·hm-2 organic fertilizer), T5 (198.28 kg·hm-2 urea, 333.33 kg·hm-2 super phosphate, 125 kg·hm-2 potassium chloride, no organic fertilizer), T6 (198.28 kg·hm-2 urea, 675 kg·hm-2 superphosphate, no K fertilizer, 7.5 t·hm-2 organic fertilizer), T7 and T8 (421.34 kg·hm-2 urea, 333.33 kg·hm-2 superphosphate, no K fertilizer, and 15 t·hm-2 organic fertilizer) were between 1.5 and 0.67, with a good soil structure. In summary, the combined application of N fertilizer and organic fertilizer, especially with the urea application rate of 421.34 kg·hm-2 (basic application 60%, topdressing 40%), the potassium chloride application rate of 125 kg·hm-2, and the organic fertilizer application rate of 7.5 t·hm-2 can improve newly added forest land. The structure of arable soil aggregates enhances the resistance of soil aggregates to water erosion.

Key words： defective forest land; water-stable aggregates; fertilizer; organic fertilizer; soil structure

Cite this article

ZHANG Lu,MENG Tingting,HU Ya,WEI Jing . Effects on soil aggregate composition and stability under various fertilization regimes of defective forest land in a sandy soil area[J]. Arid Zone Research, 2021 , 38(4) : 973 -979 . DOI: 10.13866/j.azr.2021.04.08

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