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Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (6): 1219-1229.DOI: 10.7522/j.issn.1000-694X.2018.00039

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Effects of Planting Patterns on Soil Aggregates and Organic Matter Characteristics of Sandy Soil

Lin Fang1,2, Liu Xiaojing1, Zhang Jiayang2   

  1. 1. College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, China;
    2. School of Life Science and Technology, Xinxiang University, Xinxiang 453000, Henan, China
  • Received:2018-02-06 Revised:2018-04-10 Online:2018-11-20 Published:2018-12-05

Abstract: Through six consecutive years of positioning test in northern Henan province, compared with sandy bare land, the effect of three kinds of planting patterns(alfalfa single-sowing, perennial ryegrass single-sowing, alfalfa/perennial ryegrass mixed-sowing) on soil aggregates and its organic carbon and soil organic matter were studied, and the soil aggregates characteristics were quantified by fractal dimension. Results showed that the soil mechanical-stable aggregates were mainly composed of particles with sizes 5-3 mm and 3-2 mm under sandy bare land and three kinds of planting patterns, while the soil water-stable aggregates were mainly composed of particles with size <0.25 mm; compared with sandy bare land, the content of mechanical-stable aggregates(5-3 mm and 2-3 mm) under three kinds of planting patterns were significantly increased, while the content of water-stable aggregates(<0.25 mm) decreased significantly, and the content of water-stable aggregates(3-2 mm and 2-0.5 mm) increased significantly. At the same time, the organic carbon content of soil mechanical-stable and water-stable aggregates(≥ 2 mm) increased obviously; compared with sandy bare land, the contents of soil organic matter under three kinds of planting patterns were incresed, the order was as follows:alfalfa/perennial ryegrass mixed-sowing > alfalfa single-sowing > perennial ryegrass single-sowing, and the contents decreased with the deepening of the soil layer, that is, surface aggregation features were presented; both soil mechanical-stable aggregates and water-stable aggregates, the order of fractal dimension(Dm) was:sandy bare land > perennial ryegrass single-sowing > alfalfa single-sowing > alfalfa/perennial ryegrass mixed-sowing; Pearson bilateral test showed that it had significantly positive correlation between the content of mechanical-stable and water-stable aggregates(5-3 mm and 3-2 mm) and their organic carbon(P<0.01), and it also showed significant correlation associated with soil organic matter(P<0.01). Conclusion:compared with sandy bare land, it showed that the soil aggregate characteristics and physiochemical properties of artificial planting grassland after six years were improved effectively in northern Henan province, which the alfalfa/perennial ryegrass mixed-sowing was the best planting pattern.

Key words: artificial grassland, planting patterns, sandy soil, aggregates, organic carbon

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