Stoichiometric characteristics of C, N, P of Taxus chinensis var. mairei plantation needles

CHEN Li, LIU Chenggong, QIAN Yingying, TANG Xiaodie, WANG Shengshu, LI Zhidong, LI Yan, CUI Jun

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5) : 53-61.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5) : 53-61. DOI: 10.12302/j.issn.1000-2006.202103051

Stoichiometric characteristics of C, N, P of Taxus chinensis var. mairei plantation needles

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Abstract

【Objective】 The nutrient ecological stoichiometry and nutrient reabsorption characteristics of Taxus chinensis var. mairei needles were studied to reveal its nutrient restriction pattern and nutrient efficient utilization strategy, thereby providing a theoretical basis for its high-quality afforestation and plantation cultivation 【Method】 The nutrient contents, ecological stoichiometric ratio, nutrient reabsorption efficiency and their relationships were analyzed by measuring the contents of carbon (C), nitrogen (N), and phosphorus (P) and their stoichiometric characteristics in needles of 9-year-old T. chinensis var. mairei plantations at different growth stages. 【Result】 The results showed that the average C, N and P contents of T. chinensis var. mairei plantation needles were 479.67, 22.52 and 2.21 g/kg, respectively. The C/N mass ratio (C:N), C/P mass ratio (C:P), and N/P mass ratio (N:P) were 21.74, 226.25 and 10.55, respectively. A significantly positive correlation between N, P and C existed. Similarly, P content was significantly positively correlated with C content. The C content, which was stable in the needles, had a lower coefficient of variation (3.09%), and P (22.43%) content had higher variability than that of N (15.34%). During the growing season (from June to November), the contents of C and P first rose slightly, and decreased dramatically,both peaked in August and kept until September. The C and N contents reached the lowest in October and November, respectively. The P content increased obviously first, then declined greatly,and peaked in September,much higher than those in other months. Changes in C:N and N:P were stabler than those in C:P that relied on P content. The nitrogen reabsorption efficiency (NRE) and phosphorus reabsorption efficiency (PRE) were 19.33% and 22.16%, respectively. The PRE was negatively correlated with P content and C:P in the senescent needles, but positively correlated with N:P. 【Conclusion】 In the study area, needles of 9-year-old T. chinensis var. mairei plantations had a good C storage capacity and nutrient resource competitiveness, and the nutrients were retained long time in needles because of the low efficiency of N and P reabsorption. Therefore, growth and development of T. chinensis var. mairei plantations was not hindered by N and P.

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Taxus chinensis var. mairei plantation / needle nutrient elements / stoichiometry characteristics / nutrient reabsorption efficiency

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CHEN Li , LIU Chenggong , QIAN Yingying , et al . Stoichiometric characteristics of C, N, P of Taxus chinensis var. mairei plantation needles[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2021, 45(5): 53-61 https://doi.org/10.12302/j.issn.1000-2006.202103051

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Abstract
为了探究青藏高原东部窄叶鲜卑花(Sibiraea angustata)灌木不同器官碳(C)、氮(N)、磷(P)含量的分配格局及其生态化学计量特征, 该文采用分层随机抽样方法布设样地, 选择16个窄叶鲜卑花灌丛样地, 分别采集窄叶鲜卑花灌木根、茎、叶、当年枝和果等植物器官样品, 并分析样品C、N、P含量及其计量比。结果表明: C、N、P在不同器官中的含量分别表现为茎>当年枝>果>根>叶; 叶>果>当年枝>茎>根; 果>叶>当年枝>根>茎。窄叶鲜卑花各器官中C含量相对稳定, N、P含量变异系数较大, 在根部的变异系数最大。在不同器官中N:P的范围为7.12-12.41, 其值变化不大, N:P变异系数的最小值在当年枝中, 说明N:P在当年枝中的内稳性较高。在该灌木植物体中C与N之间、C与P之间呈极显著的负相关关系, C对N、P具有稀释作用; N与P呈极显著正相关关系, N与P间具有较好的耦合协同性。分析发现: 窄叶鲜卑花不同器官C、N、P化学计量特征在一定程度上符合内稳态理论和生长速率理论, 其元素分配与器官所执行的功能密切相关; 同时指出在物种水平上应当谨慎使用生态化学计量比来判断养分的限制情况。
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