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[1]刘美 马志良**.青藏高原东部乔灌交错带地被物和土壤碳氮磷化学计量特征[J].应用与环境生物学报,2021,27(03):1-15.[doi:10.19675/j.cnki.1006-687x.2020.05040]
 LIU Mei & MA Zhiliang **.Carbon, nitrogen, and phosphorus stoichiometric characteristics of ground covers and soils in a forest-shrub ecotone on the eastern Tibetan Plateau[J].Chinese Journal of Applied & Environmental Biology,2021,27(03):1-15.[doi:10.19675/j.cnki.1006-687x.2020.05040]
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青藏高原东部乔灌交错带地被物和土壤碳氮磷化学计量特征()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
27卷
期数:
2021年03期
页码:
1-15
栏目:
研究论文
出版日期:
2021-06-25

文章信息/Info

Title:
Carbon, nitrogen, and phosphorus stoichiometric characteristics of ground covers and soils in a forest-shrub ecotone on the eastern Tibetan Plateau
作者:
刘美1 马志良2**
1绵阳师范学院,生态安全与保护四川省重点实验室 绵阳 621000
2西华师范大学生命科学学院 南充 637009
Author(s):
LIU Mei1 & MA Zhiliang 2**
1 Sichuan Province Key Laboratory of Ecological Security and Protection, Mianyang Normal University, Mianyang 621000, Sichuan, China;
2 College of Life Science, China West Normal University, Nanchong 637009, Sichuan, China
关键词:
枯落物 苔藓 土壤 植被类型 生态化学计量特征 青藏高原
Keywords:
litter moss soil vegetation type ecological stoichiometry characteristic Qinghai-Tibet Plateau
DOI:
10.19675/j.cnki.1006-687x.2020.05040
摘要:
为深入了解青藏高原东部高寒灌丛群落扩张对生态系统地表地被物和土壤C、N和P生态化学计量学特征的影响,以青藏高原东部岷江源头区典型的高寒针叶林-乔灌-灌丛垂直分布带为研究对象,分析乔灌交错带地表地被物(枯落物和苔藓层)和土壤(0-10cm、10-20cm和20-30cm)全C、全N和全P含量及生态化学计量学特征。结果表明:针叶林和和灌丛枯落物全C含量和C/P显著大于乔灌(P < 0.05 );针叶林和乔灌枯落物全N、全P含量、N/P和C/N显著大于灌丛(P < 0.05 )。针叶林苔藓层全C含量、C/N和C/P显著大于乔灌,而全N、全P含量和N/P显著小于乔灌(P < 0.05 )。乔灌0-30 cm土壤全C、全N和全P含量显著大于针叶林和灌丛(P < 0.05 )。不同植被类型土壤C/N、N/P和C/P随土层深度具有显著差异,但没有表现出一致的变化规律。Pearson相关分析结果表明,交错带枯落物和苔藓层全C含量与0-30 cm土壤全C、全N和全P含量呈显著负相关(P < 0.05 ),全N含量与0-30 cm土壤全C含量呈显著正相关(P < 0.05 ),全P含量与0-30 cm土壤全C、全N和全P含量呈显著正相关(P < 0.05 )。枯落物和苔藓层C/N和C/P与0-30 cm土壤全C和全P含量呈显著负相关(P < 0.05 ),N/P与0-30 cm土壤C/N和C/P呈显著正相关(P < 0.05 ),与0-30 cm土壤N/P呈显著负相关(P < 0.05 )。以上结果表明,青藏高原东部高寒灌丛群落扩张能够促进地表地被物和土壤对C、N和P的固存,进而影响区域森林地表C、N和P物质周转和循环等生态过程。(表5参50)
Abstract:
In order to understand the effects of alpine shrubland expansion on the carbon (C), nitrogen (N), and phosphorus (P) stoichiometric characteristics of ground covers and soils on the eastern Qinghai-Tibet Plateau, the ground covers (i.e. litter and moss) and soils from different layers (0-10cm, 10-20cm, and 20-30cm) were collected from three vegetation types of a typical alpine forest-shrub ecotone in the source area of Minjiang River, which were dominated by Picea likiangensis (coniferous forest), Picea likiangensis-Salix oritrepha (forest-shrub), and Sibiraea angustata (shrub). We analyzed the total C, total N, total P , C/N, C/P, and N/P ratios of litter, moss and soils as well as their relationships. The results showed that the total C contents and C/P of litter in coniferous forest and shrubland were significantly ( P < 0.05) higher than those in forest-shrub. The total C , total P, N/P and C/N of litter in coniferous forest and forest-shrub were significantly ( P < 0.05) higher than those in shrubland. The total C contents , C/N and C/P of moss in coniferous forest were significantly ( P < 0.05) higher than those in forest-shrub, while the total N , total P, and N /P of moss in coniferous forest were significantly ( P < 0.05) lower than those in forest-shrub. The total C, total N and total P contents of 0-30 cm soils in forest-shrub were significantly ( P < 0.05) higher than those in coniferous forest and shrubland. Moreover, the C/N, N/P and C /P varied with soil layers and vegetation types, and there w ere no consistent pattern s of C/N, N/P and C /P in soils. Furthermore, the Pearson correlation analysis indicated that the total C contents of litter and moss in the forest-shrub ecotone were significantly (P < 0.05) and negative ly correlated with total C, total N and total P contents of 0-30 cm soils, respectively. The total N contents of litter and moss were significantly (P < 0.05) and positively correlated with total C contents of 0-30 cm soils. While the total P contents of litter and moss were significantly (P < 0.05) and positively correlated with total C, total N and total P contents of 0-30 cm soils, respectively. The C/N and C/P of litter and moss were both significantly (P < 0.05) and negatively correlated with total C and total P contents of 0-30 cm soils, while N:P were significantly (P < 0.05) and positively correlated with C/N and C/P, and significantly (P < 0.05) and negatively correlated with N/P of 0-30 cm soils. These results implied that the expansion of alpine scrubland could accelerate the sequestration of C, N and P in ground covers and soils, and further affect ecological processes of C, N and P return ing and cycl ing on the forest floor of the eastern Qinghai-Tibet Plateau.

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备注/Memo

备注/Memo:
收稿日期 Received: 2020-05-22 接受日期 Accepted: 2020-07-10
西华师范大学博士科研启动基金项目(18Q047)资助 Supported by the Doctoral Scientific Research Foundation of China West Normal University (18Q047)
**通讯作者 Corresponding author (E-mail: feng281@126.com)
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更新日期/Last Update: 2020-08-04