高寒区华北落叶松林生长季内地表凋落物层碳氮磷化学计量特征  

Litter carbon, nitrogen, and phosphorus stoichiometry of Larix principis-rupprechtii in alpine region during growing season

作　　者：尹宝丝 史常青[1,2,3,4] 贺康宁 田赟[1,2,3,4] 左巍 YIN Baosi;SHI Changqing;HE Kangning;TIAN Yun;ZUO Wei(Faculty of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing 100083, China;Engineering Research Center of Forestry Ecological Engineering of Ministry of Education, Beijing 100083, China;Beijing Engineering Research Center of Soil and Water Conservation, Beijing 100083, China)

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]水土保持国家林业局重点实验室,北京100083 [3]林业生态工程教育部工程研究中心,北京100083 [4]北京市水土保持工程技术研究中心,北京100083

出　　处：《应用与环境生物学报》2019年第2期268-274,共7页Chinese Journal of Applied and Environmental Biology

基　　金：中央高校基本科研业务费专项资金(2015ZCQ-SB-03);国家科技支撑计划(2015BAD07B030302)资助~~

摘　　要：为了解青海高寒区华北落叶松地表凋落物不同分解层养分在生长季内的变化特征,分别在2015年5月1日(5/01)、6月15日(6/15)、7月30日(7/30)、9月13日(9/13)和10月28日(10/28)进行采样,将凋落物层分为未分解层(Fresh litter layer,LL)、半分解层(Fragmented litter layer,FL)和全分解层(Humified litter layer,HL),对华北落叶松凋落物总有机碳(Total organic carbon,TOC)、全氮(Total nitrogen,TN)和全磷(Total phosphorus,TP)及其化学计量比进行测定分析.结果显示:生长季内凋落物的TOC、TN、TOC/TP、TOC/TN和TN/TP均表现为LL> FL> HL,且各分解层之间差异显著,TP含量各分解层之间差异不显著.在生长季内,TOC、TN和TP含量及其化学计量比表现出不同的变化规律,但最大值均出现在5/01.凋落物分解层与采样时间对TOC、TN和TP储量及其化学计量特征影响的交叉分析表明,TOC、TOC/TN、TOC/TP和TN/TP的变异主要受分解层的影响,TN的变异主要受采样时间的影响,TP的变异主要受分解层和采样时间交互作用的影响,且采样时间对TP的变异没有产生显著影响.凋落物TOC、TN和TP含量及TOC/TN、TOC/TP和TN/TP的Pearson相关分析显示,TOC和TN与TOC/TN、TOC/TP和TN/TP之间呈极显著正相关关系(P <0.01),P与TOC/TN没有相关关系(P> 0.05),与TOC/P显著负相关(P <0.05),与TN/TP极显著正相关(P <0.01).本研究表明,青海高寒区华北落叶松凋落物在分解过程中TOC、TN和TP化学计量均表现出明显的季节变化,季节变化和分解程度将显著影响凋落物分解过程中TOC、TN和TP含量;TOC和TN含量是影响TOC、TN和TP化学计量比的关键因子.(图1表4参42)This study aimed to analyze the seasonal variation of litter nutrients in different litter decomposition layers of Larix principis-rupprechtii in the alpine region of Qinghai province. Samples were taken in 2015 on May 1 (5/01), June 15 (6/15), July 30 (7/30), September 13 (9/13), and October 28 (10/28). The litter layers were divided into fresh litter layer (LL), fragmented litter layer (FL), and humified litter layer (HL). The total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) stoichiometry of litter was evaluated. The results showed that the TOC, TN, TOC/TP, TOC/TN and TN/TP of the litter during the growing season were highest in the LL, followed by the FL, and lowest in the HL. There was a significant difference between the decomposition layers. However, the difference between the decomposition layers was not significant for TP. During the growing season, the TOC, TN and TP contents and their stoichiometric ratios showed different patterns of variation, but the maximum values were found on May 1. The cross-analysis of litter decomposition layer and sampling time on TOC, TN and TP reserves and their stoichiometric characteristics demonstrate the following: the variation of TOC, TOC/TN, TOC/TP and TN/TP is mainly affected by the decomposition layer;TN is affected by the sampling time;TP is affected by the interaction of the decomposition layer and sampling time;and the sampling time has no significant effect on the variation of TP. Pearson correlation analysis of litter TOC, TN, and TP contents and TOC/TN, TOC/TP, and TN/TP showed that there was a highly significant positive correlation between TOC and TN and TOC/TN, TOC/TP, and TN/TP (P < 0.01). There was no correlation between TP and TOC/TN (P > 0.05), but a significant negative correlation with TOC/TP (P < 0.05) and a very significant positive correlation with TN/TP (P < 0.01). To conclude, the TOC, TN and TP contents and their stoichiometric ratios are subject to seasonal changes during the decomposition process of L. principis-ruppr

关 键 词：高寒区 华北落叶松 凋落物分解层 化学计量 季节变化 

分 类 号：S718.554[农业科学—林学]