JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (1): 161-172.doi: 10.11849/zrzyxb.20161100

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Content and Ecological Stoichiometry Characteristics of Organic Carbon, Nitrogen and Phosphorus of Typical Soils in Sub-alpine/Alpine Mountain of Western Sichuan

CHENG Huan, GONG Yuan-bo*, WU Qiang, LI Yao, LIU Ying, ZHU De-wen   

  1. College of Forestry Sichuan Agricultural University, Chengdu 611130, China
  • Received:2016-10-13 Revised:2017-02-02 Online:2018-01-20 Published:2018-01-20
  • Supported by:

    The Sci-tech Pillar Project of the Twelfth Five-year Plant of China, No. 2011BAC09B05; Key Laboratory of Soil and Water Conservation & Desertification Combating of Colleges and Universities, Sichuan Agricultural University Construction Projects.

Abstract:

In this paper, organic carbon, total nitrogen, total phosphorus contents and ecological stoichiometry characteristics of typical soil types at different elevations of sub-alpine /alpine mountain of western Sichuan were studied and compared with the results of survey made in 1985. The content and ecological chemistry variables in humus horizon, illuvial horizon and parent materials horizon of various soil types (subalpine mountain meadow soil, meadow soil, dark brown soil, brown soil, yellow brown soil, cinnamon soil) were measured and calculated. The results show that in terms of soil organic carbon, the soils are sorted in following order: subalpine mountain meadow soil>meadow soil>dark brown soil>cinnamon soil>yellow brown soil>brown soil; in terms of total nitrogen content, the soils are sorted in following order: dark brown soil>subalpine mountain meadow soil>meadow soil>brown soil>cinnamon soil>yellow brown soil; in terms of total phosphorus contents, the soils are sorted in following order: subalpine mountain meadow soil>brown soil>meadow soil>dark brown soil>cinnamon soil>yellow brown soil; and the contents of dark brown soil, brown soil decrease with the increasing of the depth. According to the classification standard of Second National Soil Survey, the survey region is highly rich in soil organic carbon, rich in total nitrogen, and lack of total phosphorus, and such three elements firstly increase and then decrease from south to north. The ecological stoichiometry characteristics, soil carbon-nitrogen ratio: meadow soil>cinnamon soil>yellow brown soil>subalpine mountain meadow soil>dark brown soil>brown soil, carbon-phosphorus ratio: meadow soil>yellow brown soil>cinnamon soil>dark brown soil>subalpine mountain meadow soil>brown soil, nitrogen-phosphorus ratio: meadow soil>dark brown soil>yellow brown soil>cinnamon soil >subalpine mountain meadow soil >brown soil,, and total phosphorus content is the limiting factor of soil quality. Compared with the result of the survey in 1985, the organic carbon content in subalpine mountain meadow soil, meadow soil, yellow brown soil and cinnamon soil increased and the organic carbon content in brown soil decreased significantly (the content in 2015 was 31.06% of that in 1985) during the past three decades; total nitrogen content had slight change; total phosphorus content decreased with range between 56.41% - 87.85%.

Key words: ecological stoichiometry characteristics, sub-alpine/alpine mountain, western Sichuan, typical soil type

CLC Number: 

  • S714.2