苦竹叶片碳氮磷化学计量特征的海拔梯度效应

林 华<sup>1</sup>; 谢燕燕<sup>2</sup>; 杨丽婷<sup>2</sup>; 陈双林<sup>2</sup>; 郭子武<sup>2*</sup>

引用本文:	林华, 谢燕燕, 杨丽婷, 陈双林, 郭子武.苦竹叶片碳氮磷化学计量特征的海拔梯度效应[J].广西植物,2021,41(9):1443-1449.[点击复制]
	LIN Hua, XIE Yanyan, YANG Liting, CHEN Shuanglin, GUO Ziwu.Concentration and its stoichiometrics of leaf carbon, nitrogen and phosphorus of Pleioblastus amarus forest from different altitudinal gradients[J].Guihaia,2021,41(9):1443-1449.[点击复制]

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苦竹叶片碳氮磷化学计量特征的海拔梯度效应
林华¹, 谢燕燕², 杨丽婷², 陈双林², 郭子武^2*
1. 福建省沙县林业局, 福建沙县 365500;2. 中国林业科学研究院亚热带林业研究所, 杭州 311400

摘要:

为揭示海拔梯度对苦竹林立竹叶片碳(C)、氮(N)、磷(P)化学计量特征的影响,该文以3个海拔梯度 [低海拔,(200±10)m; 中海拔,(400±10)m; 高海拔,(800±10)m]苦竹林为研究对象,测定1至3年生立竹叶片C、N、P含量,分析其化学计量特征和异速增长关系。结果表明:(1)立竹年龄对苦竹叶片C、N、P含量及其化学计量特征影响明显,随立竹年龄的增大,苦竹叶片C、N、P含量和N:P总体上均呈降低趋势,而C:N、C:P总体上呈升高趋势。(2)海拔对苦竹叶片C、N、P含量及其化学计量特征有重要影响,随海拔梯度升高,不同年龄立竹叶片C含量呈先升高后下降变化趋势,N、P含量总体上呈降低趋势,而C:N、C:P和N:P均呈升高趋势。(3)不同海拔梯度苦竹林立竹叶片C、N、P含量和C:N、C:P差异显著,中、高海拔苦竹林立竹叶片N:P无显著差异,均显著高于低海拔苦竹林; 不同海拔梯度苦竹林立竹叶片C、N、P间呈显著的正异速增长关系,随海拔梯度的升高,C-N、C-P异速增长指数显著升高,而N-P异速增长指数显著下降。综上结果表明,高海拔苦竹林虽然N、P利用效率提高,但立竹叶片C含量较低,P限制性作用增强; 中海拔苦竹林不但具有较高的N、P利用效率,而且立竹叶片C含量高,说明中海拔是苦竹林丰产培育的适宜海拔。

关键词: 苦竹, 海拔, 主要养分, 生态化学计量, 异速增长

DOI：10.11931/guihaia.gxzw202009027

分类号:Q948

文章编号:1000-3142(2021)09-1443-07

基金项目:“十三五”国家重点研发计划重点专项课题(2016YFD0600903)[Supported by the National Key Research and Development Program of China in “the 13th Five-Year Plan”(2016YFD0600903)]。

Concentration and its stoichiometrics of leaf carbon, nitrogen and phosphorus of Pleioblastus amarus forest from different altitudinal gradients

LIN Hua¹, XIE Yanyan², YANG Liting², CHEN Shuanglin², GUO Ziwu^2*

1. Forestry Bureau of Shaxian County, Shaxian 365500, Fujian, China;2. Research Institute of Subtropical Forestry, CAF, Hangzhou 311400, China 1. Forestry Bureau of Shaxian County, Shaxian 365500, Fujian, China; 2. Research Institute of Subtropical Forestry, CAF, Hangzhou 311400, China

Abstract:

To reveal the influence of altitude on stoichiometrics of leaf carbon(C), nitrogen(N)and phosphorus(P)of Pleioblastus amarus, we determined the contents of leaf C, N and P for 1-3-year-old bamboo from stand at three different altitudinal gradients [low altitude,(200±10)m; middle altitude(400±10)m; high altitude,(800±10)m], and analyzed their stoichiometries and allometric growth. The results were as follows:(1)Bamboo age had great influences on the contents of leaf C, N and P and its stoichiometrics. With the increasing of bamboo age, the contents of leaf C, N, P and N:P ratios decreased overall, while ratios of C:N and C:P increased.(2)Altitude had significant effects on the contents of leaf C, N and P and its stoichiometrics. With the increase of altitudinal gradient, leaf carbon increased remarkably and then deceased sharply, while leaf N and P decreased overall, and leaf C:N, C:P and N:P increased generally.(3)There were significant differences existing in the contents of leaf C, N, P, C:N and C:P at different altitudinal gradients. Leaf N:P ratios of stands from the middle and high altitudes were higher than those of the low altitude. There was significantly positive allometric growth between leaf C, N and P. With the increase of altitudinal gradient, allometric exponent for leaf C-N and C-P increased remarkably, but that for N-P decreased dramatically. The results indicate that the P. amarus stand at the high altitude had the highest utilization efficiency of N and P, but its carbon content was lower and P limitation increased. While the P. amarus stand at the middle altitude had higher utilization efficiencies of N, P and the highest C content, therefore, it is the preferred altitude of high-yield cultivation for P. amarus forest.

Key words: Pleioblastus amarus, altitude, main nutrient, ecological stoichiometry, allometric growth