Nutrient contents and stoichiometric characteristics of plant leaf-litter-soil in alpine forest

doi:10.3785/j.issn.1008-9209.2020.10.261

Journal of Zhejiang University (Agriculture and Life Sciences)

2021, Vol. 47

Issue (5): 607-618 DOI: 10.3785/j.issn.1008-9209.2020.10.261

Resource utilization & environmental protection

Nutrient contents and stoichiometric characteristics of plant leaf-litter-soil in alpine forest

Hong YANG¹(

),Wenjie LIU¹,Heman LIU²(

),Lihua CAO²

^1.Resources and Environment College, Tibet Agricultural and Animal Husbandry University, Linzhi 860000, Xizang, China
^2.College of Agronomy, Xinyang Agriculture and Forestry University, Xinyang 464000, Henan, China

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Abstract

In order to explore the nutrient content, return rate and stoichiometric characteristics of plant leaf-litter-soil in alpine forest, the typical forests of Sejila Mountain in Southeast Tibet were analyzed. The results showed that for the same forest type, the contents of organic carbon (C), total nitrogen (N), total phosphorus (P) and total potassium (K) in 0-10 cm soil layer were the highest, while those in ＞20-30 cm soil layer were the lowest. The contents of total N, total P and total K in the samples were new leaf＞old leaf＞litter＞soil, while the content of organic C was old leaf＞new leaf＞litter＞soil. The stoichiometric ratios of C to N, C to P, and C to K of soil, litter, new and old leaves, respectively, were coniferous forest＞broad-leaved forest. It could be seen that coniferous forest was more conducive to the accumulation of C, and broad-leaved forest was conducive to the accumulation of mineral nutrients of N, P, and K. The stoichiometric ratios of N to P in plant leaves ranged from 2.87-5.27, which were significantly lower than the global average level (16.00). It was indicated that this study area was obviously restricted by N element. The nutrient return rates of N, P, and K were all positive, and generally showed that the broad-leaved forest was higher than the coniferous forest. The results provide data support for scientifically clarifying the plant leaf-litter-soil nutrient cycle of forest ecosystem in Southeast Tibet.

Key words： alpine forest stoichiometric characteristics plant leaf litter soil

Received: 26 October 2020 Published: 27 October 2021

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Corresponding Authors: Heman LIU E-mail: hyang2016@163.com;liuh-m@163.com

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Cite this article:

Hong YANG,Wenjie LIU,Heman LIU,Lihua CAO. Nutrient contents and stoichiometric characteristics of plant leaf-litter-soil in alpine forest. Journal of Zhejiang University (Agriculture and Life Sciences), 2021, 47(5): 607-618.

URL:

http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2020.10.261 OR http://www.zjujournals.com/agr/Y2021/V47/I5/607

高寒森林植物叶片-枯落物-土壤养分含量及化学计量特征

以藏东南色季拉山典型森林植被为研究对象，探究高寒森林植物叶片-枯落物-土壤养分含量、回流率及化学计量特征。结果表明：同一森林类型有机碳、全氮、全磷和全钾含量在不同土层中均表现为0～10 cm土层最高，＞20～30 cm土层最低；各部分中全氮、全磷和全钾含量表现为新叶＞老叶＞枯落物＞土壤，有机碳含量表现为老叶＞新叶＞枯落物＞土壤。土壤、枯落物、新叶和老叶的碳（C）、氮（N）和C、磷（P）与C、钾（K）的化学计量比均表现为针叶林＞阔叶林，可见针叶林更有利于C的累积，阔叶林则有利于N、P、K矿质营养元素的累积。本研究中，植物叶片N、P的化学计量比分布在2.87～5.27之间，显著低于全球平均水平（16.00），说明本研究区域为明显的N元素限制类型。N、P、K养分回流率均为正值，总体上均表现为阔叶林＞针叶林。本研究结果为科学阐明藏东南森林生态系统植物叶片-枯落物-土壤养分循环研究提供了数据支撑。

关键词： 高寒森林, 化学计量特征, 植物叶片, 枯落物, 土壤

Table 1 Sample plot location and its community structure

Fig. 1 Distribution characteristics of OC content in leaf-litter-soil continuum of forest vegetationDifferent lowercase or uppercase letters above bars indicate significant or highly significant differences at the same soil depth (A) or the same sample type (B) among different vegetation types at the 0.05 or 0.01 probability level.

Fig. 2 Distribution characteristics of TN content in leaf-litter-soil continuum of forest vegetationDifferent lowercase or uppercase letters above bars indicate significant or highly significant differences at the same soil depth (A) or the same sample type (B) among different vegetation types at the 0.05 or 0.01 probability level.

Fig. 3 Distribution characteristics of TP content in leaf-litter-soil continuum of forest vegetationDifferent lowercase or uppercase letters above bars indicate significant or highly significant differences at the same soil depth (A) or the same sample type (B) among different vegetation types at the 0.05 or 0.01 probability level.

Fig. 4 Distribution characteristics of TK content in leaf-litter-soil continuum of forest vegetationDifferent lowercase or uppercase letters above bars indicate significant or highly significant differences at the same soil depth (A) or the same sample type (B) among different vegetation types at the 0.05 or 0.01 probability level.

Fig. 5 Stoichiometric characteristics of OC, TN, TP, and TKDifferent lowercase or uppercase letters above bars indicate significant or highly significant differences at the same sample type among different vegetation types at the 0.05 or 0.01 probability level.

Fig. 6 Correlation between stoichiometric ratios of plant leaf-litter-soil C to N and other stoichiometric ratios

Fig. 7 Nutrient return ratePL: P. likiangensis var. linzhiensis; AG: A. georgei var. smithii; RN: R. nyingchiense; RA: R. aganniphum.


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