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浙江大学学报(农业与生命科学版)  2021, Vol. 47 Issue (5): 607-618    DOI: 10.3785/j.issn.1008-9209.2020.10.261
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高寒森林植物叶片-枯落物-土壤养分含量及化学计量特征
杨红1(),柳文杰1,刘合满2(),曹丽花2
1.西藏农牧学院资源与环境学院,西藏 林芝 860000
2.信阳农林学院农学院,河南 信阳 464000
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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摘要:

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    
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
收稿日期: 2020-10-26 出版日期: 2021-10-27
CLC:  S 714  
基金资助: 西藏农牧学院林学创新团队建设项目(藏财预指2020-11-13);西藏农牧学院厅校联合基金(76660026);西藏自治区农业资源与环境学科建设项目(藏财预指2020-001);大连民族大学联合项目(766660042)
通讯作者: 刘合满     E-mail: hyang2016@163.com;liuh-m@163.com
作者简介: 杨红(https://orcid.org/0000-0003-4672-0831),E-mail:hyang2016@163.com
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引用本文:

杨红,柳文杰,刘合满,曹丽花. 高寒森林植物叶片-枯落物-土壤养分含量及化学计量特征[J]. 浙江大学学报(农业与生命科学版), 2021, 47(5): 607-618.

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.

链接本文:

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

样地植被类型

Vegetation type of sample plot

经度(E)

Longitude (E)

纬度(N)

Latitude (N)

海拔

Altitude/m

坡度

Slope/(°)

雪山杜鹃 R. aganniphum94°41′39.47″29°39′17.26″4 30025
林芝杜鹃 R. nyingchiense94°41′37.22″29°39′12.51″4 10032
急尖长苞冷杉 A. georgei var. smithii94°42′20.35″29°39′05.59″3 90048
林芝云杉 P. likiangensis var. linzhiensis94°42′32.53″29°39′05.08″3 70041
表1  样地位置及其群落结构
图1  森林植被叶片-枯落物-土壤连续体OC含量分布特征短栅上的不同小写或大写字母表示在相同土壤深度(A)或相同样品类型(B)不同植被间在P<0.05或P<0.01水平差异有统计学或高度统计学意义。
图2  森林植被叶片-枯落物-土壤连续体TN含量分布特征短栅上的不同小写或大写字母表示在相同土壤深度(A)或相同样品类型(B)不同植被间在P<0.05或P<0.01水平差异有统计学或高度统计学意义。
图3  森林植被叶片-枯落物-土壤连续体TP含量分布特征短栅上的不同小写或大写字母表示在相同土壤深度(A)或相同样品类型(B)不同植被间在P<0.05或P<0.01水平差异有统计学或高度统计学意义。
图4  森林植被叶片-枯落物-土壤连续体TK含量分布特征短栅上的不同小写或大写字母表示在相同土壤深度(A)或相同样品类型(B)不同植被间在P<0.05或P<0.01水平差异有统计学或高度统计学意义。
图5  OC、TN、TP、TK的化学计量特征短栅上的不同小写或大写字母表示在相同样品类型不同植被间在P<0.05或P<0.01水平差异有统计学或高度统计学意义。
图6  植物叶片-枯落物-土壤的C、N化学计量比与其他化学计量比的相关关系
图7  养分回流率PL:林芝云杉;AG:急尖长苞冷杉;RN:林芝杜鹃;RA:雪山杜鹃。
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