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Acta Prataculturae Sinica ›› 2021, Vol. 30 ›› Issue (3): 200-207.DOI: 10.11686/cyxb2020146

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Characteristics of soil nutrients under different land types in the loess hill region based on ecological chemometrics

Shuai-nan LIU1(), Guang LI1(), Jiang-qi WU1, Wei-wei MA1, Chuan-jie YANG1, Shi-kang ZHANG2, Yao YAO3, Yan-hua LU1, Xing-xing WEI1, Juan ZHANG1   

  1. 1.College of Forestry,Gansu Agricultural University,Lanzhou 730070,China
    2.College of Agriculture,Gansu Agricultural University,Lanzhou 730070,China
    3.College of Information Science and Technology,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2020-03-30 Revised:2020-05-18 Online:2021-03-20 Published:2021-03-09
  • Contact: Guang LI

Abstract:

This research aimed to explore the characteristics of soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) under different land types in the loess hill region. Sites classed as typical wheat land, spruce woodland, and alfalfa land in the loess hill region were identified and SOC, TN, and TP levels and their stoichiometric ratio for the different land types and soil depths (0-10 cm, 10-20 cm, 20-40 cm, 40-60 cm, 60-80 cm, 80-100 cm) were evaluated. Based on the measured data, variance and relevant statistical analysis were conducted. It was found that SOC, TN, and TP concentrations in all three land types decreased with increasing soil depth, and their average contents were 12.19, 0.33, and 0.48 g·kg-1, respectively. The spatial variability of SOC, TN, and TP at wheat and alfalfa land sites was larger than that in spruce forest. The ranking for SOC and TN was spruce woodland>wheat field>alfalfa field, and the TP concentration ranked spruce woodland>alfalfa field>wheat field. A significant positive correlation was found between SOC, TN, and TP. The wheat field C∶P ratio was higher than that of the alfalfa field by 41.96% (P<0.05), while the N∶P ratio of wheat land was significantly higher than that of spruce woodland and alfalfa fields by 28.57% and 36.19%, respectively. Averaged over the three different land types, the values of the soil stoichiometric ratios (C∶N, C∶P, and N∶P) were 39.61, 31.53, and 0.83, respectively. The value for C∶N is greater than the average for greater China (12.3), while values for C∶P and N∶P are significantly smaller than the national average (61.0, 5.2, respectively). The C∶N value in the loess hill region is relatively stable. Land use types have distinctive C, N, and P content signatures and stoichiometric ratios. Appropriate adjustment of land use structure is conducive to the retention of soil nutrients and can potentially improve soil ecological status.

Key words: loess hilly region, soil stoichiometric characteristics, soil carbon nitrogen and phosphorus, land type