干旱区研究 ›› 2024, Vol. 41 ›› Issue (3): 444-455.doi: 10.13866/j.azr.2024.03.09 cstr: 32277.14.j.azr.2024.03.09
白丽丽1(), 王文颖2,3(), 德却拉姆2, 刘艳方1, 邓艳芳4
收稿日期:
2023-08-10
修回日期:
2023-10-23
出版日期:
2024-03-15
发布日期:
2024-04-01
通讯作者:
王文颖. E-mail: wangwy0106@163.com作者简介:
白丽丽(1990-),女,博士研究生,主要从事草地生态学研究. E-mail: Lilysx@163.com
基金资助:
BAI Lili1(), WANG Wenying2,3(), Dequelamu 2, LIU Yanfang1, DENG Yanfang4
Received:
2023-08-10
Revised:
2023-10-23
Published:
2024-03-15
Online:
2024-04-01
摘要:
本研究针对祁连山国家公园山体沿海拔(2700~4043 m)自下而上出现的针叶林、草甸化草原、高寒灌丛、高寒草甸、流石滩稀疏植被5种典型植被,研究土壤碳、氮、磷含量及生态化学计量比垂直分异规律,为祁连山国家公园生态系统土壤碳氮磷生物地球化学循环过程提供数据参考和科学依据。结果表明:(1) 祁连山山体垂直带上0~40 cm土壤总碳、总氮和总磷含量分别为15.33~83.46 g·kg-1、1.63~7.76 g·kg-1、0.41~0.66 g·kg-1。土壤总碳和总氮含量均表现为针叶林>草甸化草原>高寒灌丛>高寒草甸>流石滩稀疏植被,都是沿着海拔的升高显著降低。土壤全磷含量表现为高寒灌丛显著高于高寒草甸,其余植被间差异不显著。(2) 0~40 cm土壤铵态氮、硝态氮、速效磷含量分别为11.01~14.73 mg·kg-1、2.78~12.46 mg·kg-1和4.35~13.57 mg·kg-1。土壤铵态氮含量在各植被类型间差异不显著,土壤硝态氮含量沿着海拔的升高而显著降低,土壤速效磷在流石滩稀疏植被中含量较高。(3) 0~40 cm土壤C:N、C:P和N:P含量分别为9.52~10.11、29.89~320.24和3.18~29.63,土壤C:N沿着海拔升高逐渐降低,土壤C:P和N:P在流石滩稀疏植被中显著低于其他植被,潜在指示碳和氮是流石滩限制性养分元素,但相对于碳和氮,流石滩是一个富磷的环境。海拔综合多种环境因子变化,显著影响土壤碳、氮、磷的生物化学过程。
白丽丽, 王文颖, 德却拉姆, 刘艳方, 邓艳芳. 祁连山典型植被土壤碳、氮、磷含量及生态化学计量特征的垂直变化[J]. 干旱区研究, 2024, 41(3): 444-455.
BAI Lili, WANG Wenying, Dequelamu , LIU Yanfang, DENG Yanfang. Elevational variations in ecological soil C, N, and P stoichiometry among five typical vegetation types in the Qilian Mountains[J]. Arid Zone Research, 2024, 41(3): 444-455.
表1
样地基本情况"
植被类型(土壤类型) | 地理位置 | 海拔/m | 植被盖度/% | 优势种 |
---|---|---|---|---|
针叶林 (山地灰褐土) | 37°17′25″N, 101°57′29″E | 2700 | 80 | 青海云杉+早熟禾 Picea crassifolia+Poa annua |
草甸化草原 (亚高山草甸土) | 37°37′42″N, 101°24′11″E | 3278 | 95 | 珠芽蓼+鹅绒委陵菜+高山嵩草 Bistorta vivipara+Potentilla anserina+Kobresia pygmaea |
高寒灌丛 (高山灌丛草土) | 37°39′17″N, 101°25′38″E | 3555 | 95 | 金露梅+鬼箭锦鸡儿+矮嵩草 Potentilla fruticosa+Caragana jubata+Kobresia humilis |
高寒草甸 (高山草甸土) | 37°40′19″N, 101°26′13″E | 3720 | 70 | 高山嵩草+早熟禾 Kobresia pygmaea+Poa annua |
流石滩稀疏植被 (高山寒漠土) | 37°41′30″N, 101°27′06″E | 4043 | 40 | 胎生鳞茎早熟禾+高山嵩草+囊肿草Poa bulbosa L. var. vivipara Koeler+Kobresia pygmaea+Thylacospermum caespitosum |
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