| 不同林龄湿地松叶、枝、根与土壤的生态化学计量及稳态性特征 |
| |
| 引用本文： | 贾婷,谌梦云,张露,易敏,郭圣茂,程子珊,李响,钟秋蔚.不同林龄湿地松叶、枝、根与土壤的生态化学计量及稳态性特征[J].核农学报,2023,37(2):397-404. |
| |
| 作者姓名： | 贾婷 谌梦云 张露 易敏 郭圣茂 程子珊 李响 钟秋蔚 |
| |
| 作者单位： | 江西省森林培育重点实验室/江西特色林木资源培育与利用2011协同创新中心/江西农业大学林学院，江西 南昌 330045 |
| |
| 基金项目： | 国家重点研发计划项目(2017YFD0600502-5);江西省林业科技创新专项(201811) |
| |
| 摘 要： | 为明确江西省湿地松(Pinus elliottii)人工林生态系统中器官与土壤养分的分配规律和稳定机制，在江西省泰和县石溪林场选择幼龄林、中龄林和成熟林阶段的湿地松人工林为研究对象，探讨其叶-枝-根-土壤的碳(C)、氮(N)、磷(P)含量及生态化学计量特征，分析湿地松不同器官与土壤养分的耦合关系和稳态性特征。结果表明，湿地松不同器官C、N、P含量均值随林龄的增加呈“V”型变化，均在中龄林阶段最低，分别为518.10、3.22和0.71 g·kg-1；而各器官C∶N值与C∶P值随林龄的增加先上升后下降，在中龄林达到峰值，说明中龄林为湿地松的速生期，对N、P元素的消耗大。土壤N含量和N∶P值随林龄的增加不断上升，而土壤C∶N值则持续下降，说明土壤N矿化能力随林龄的增加逐渐增强；成熟林阶段土壤C∶P值和N∶P值均高于其他林龄，表明成熟林阶段土壤P较匮乏。针叶N、C∶N、N∶P，枝C、C∶N、N∶P和根C、P、C∶P稳态性模型回归结果不显著，具有绝对的稳定性。针叶P、枝P的稳态性等级分别为弱敏感态和敏感态。不同器官N∶P的内稳性指数(HN∶P)大小关...
|
| 关 键 词： | 湿地松 林龄 生态化学计量 内稳态 |
| 收稿时间： | 2022-04-20 |
Ecological Stoichiometry and Homeostasis Index of Needles,Branches, Roots and Soil in Pinus elliottii Plantations of Different Ages |
| |
| JIA Ting,CHEN Mengyun,ZHANG Lu,YI Min,GUO Shengmao,CHENG Zishan,LI Xiang,ZHONG Qiuwei.Ecological Stoichiometry and Homeostasis Index of Needles,Branches, Roots and Soil in Pinus elliottii Plantations of Different Ages[J].Acta Agriculturae Nucleatae Sinica,2023,37(2):397-404. |
| |
| Authors: | JIA Ting CHEN Mengyun ZHANG Lu YI Min GUO Shengmao CHENG Zishan LI Xiang ZHONG Qiuwei |
| |
| Institution: | Jiangxi Provincial Key Laboratory of Silviculture/ 2011 Collaboration Innovation Center of Jiangxi Typical Trees Cultivation and Utilization/ College of Forestry，Jiangxi Agricultural University，Nanchang，Jiangxi 330045 |
| |
| Abstract: | In order to clarify the truth of the nutrient distribution and stoichiometric homeostasis of organs and soil in the Pinus elliottii plantation ecosystem in Jiangxi Province， the sapling forest， young forest and mature forest in Shixi Forest Farm， Taihe County were selected as research objects. The needles， branches， roots and soil of these objects were used to explore the content of carbon （C）， nitrogen （N）， phosphorus （P）， and ecological stoichiometry characteristics， and their stoichiometric homeostasis traits were analyzed. The results showed that the average of C， N and P contents in different organs of slash pine showed a “V” shape change with the increasing of forest age， the lowest were in the young forest which were 518.10， 3.22 and 0.71 g·kg-1， respectively. The ratio of C∶N and C∶P first increased and then decreased with the forest age， when in the young forest stage the ratios reached the peak values， which indicted that the young forest stage was the fast-growing period of slash pine， and the consumption of N and P elements was large. Soil N content and N∶P ratio increased with extension of the forest age， while soil C∶N ratio continued decreasing， indicating that the mineralization ability of soil N gradually increased with the forest age. The C∶P ratio and N∶P ratio of soil in mature forest stage were both higher than other forest ages， which meant that soil P in mature forest stage was relatively scarce. The homeostasis results of N， C∶N ratio， N∶P ratio in needles， C， C∶N ratio， N∶P ratio in branches and C， P， C∶P ratio in roots were not significant （P>0.1）， and had absolute stability. The homeostasis grade of P in needles was weakly sensitive， and that in branches was sensitive. The internal stability index of N∶P （HN∶P） among different organs followed the order of rootsPinus elliottii plantation. |
| |
| Keywords: | Pinus elliottii forest age ecological stoichiometry homeostasis |
|
| 点击此处可从《核农学报》浏览原始摘要信息 |
| 点击此处可从《核农学报》下载免费的PDF全文 |
