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中国沙漠 ›› 2021, Vol. 41 ›› Issue (1): 219-227.DOI: 10.7522/j.issn.1000-694X.2020.00125

• • 上一篇    下一篇

祁连山北麓不同海拔土壤化学计量特征

高海宁1,2(), 李彩霞2, 孙小妹1, 张勇2, 陈年来1()   

  1. 1.甘肃农业大学 资源与环境学院,甘肃 兰州 730070
    2.河西学院 甘肃省河西走廊特色资源利用省级重点实验室,甘肃 张掖 734000
  • 收稿日期:2020-09-08 修回日期:2020-11-24 出版日期:2021-01-29 发布日期:2021-01-29
  • 通讯作者: 陈年来
  • 作者简介:陈年来(E-mail: chennl@163.com
    高海宁(1973—),男,甘肃秦安人,副教授,研究方向为植物生态学。E-mail: gaohn2004@163.com
  • 基金资助:
    甘肃省重点研发计划项目(1504FKCA003)

Stoichiometry characteristics of soil at different altitudes in the Qilian Mountains

Haining Gao1,2(), Caixia Li2, Xiaomei Sun1, Yong Zhang2, Nianlai Chen1()   

  1. 1.College of Resource and Environmental Sciences,Gansu Agricultural University,Lanzhou 730070,China
    2.Key Laboratory of Hexi Corridor Resources Utilization of Gansu,Hexi University,Zhangye 734000,Gansu,China
  • Received:2020-09-08 Revised:2020-11-24 Online:2021-01-29 Published:2021-01-29
  • Contact: Nianlai Chen

摘要:

对祁连山中段冰沟流域土壤有机C、N、P含量垂直分布与化学计量特征及其影响因素进行研究。结果表明:冰沟流域土壤有机C、N、P含量在各样点随土层深度而降低,并在表层土中聚集较明显;在0—40 m土层中,土壤有机C、N、P平均含量随海拔升高总体呈现先增高后下降的趋势,在中、高海拔处最高,P含量变异较小。0—40 cm土层中土壤C/N在海拔3 128—2 814 m处高于其他海拔,在3 075 m处C/N最高,土壤C/N、C/P随海拔升高总体呈下降趋势,均在中高海拔处最高,而土壤N/P在海拔3 454 m处最高,在低海拔2 814 m处最低。不同植被类型土壤的C/N、N/P差异性不显著,而土壤SOC/P差异显著,3种植被类型影响土壤C/N和C/P的大小为乔木林>高山灌丛>高山草地,而土壤N/P为灌丛>乔木林>高山草地;植被类型、海拔是影响土壤C、N、P含量和化学计量比的主要因素,其次为盖度、坡向。

关键词: 祁连山, 海拔, 土壤, 化学计量比

Abstract:

To elucidate the vertical distribution of soil organic carbon (C), nitrogen (N) and phosphorus (P) concentration in Qilian Mountain northern foot,the eco-stoichiometric characteristics at different elevations and their influencing factors were discussed. The results showed that the soil SOC, N and P content decreased with the increase of soil depth, and the significant aggregation was observed at topsoil; In the 0-40 cm soil layer, the average contents of soil SOC, N and P showed a trend of rising first and then declining with the increase of altitude, and reached the highest at the middle and high altitude area. Notably, the variation of P content is small and relatively stable. The C/N was higher at attitude of 3 128-2 814 m, and especially, the highest at 3 075 m. However, soil C/P and N/P showed a downward trend with the increase of altitude, and they were all the highest at the middle and high altitude area, while soil N/P showed the highest level at 3 454 m and the lowest level at 2 814 m. Meanwhile, there was no significant difference in soil C/N and N/P among different land types but significant difference in C/P. The effects of the three vegetation types on soil C/N and C/P were: arbor forest > alpine shrub > alpine grassland, while N/P was: alpine shrub > arbor forest > alpine grassland. Vegetation type and altitude are the main factors affecting the eco-stoichiometric ratio of soil C, N and P, followed by coverage and slope aspect.

Key words: Qilian Mountains, altitude, soil, stoichiometry ratio

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