川西亚高山2种典型针叶林土壤碳氮磷和碳稳定同位素分布特征

doi:10.16036/j.issn.1000-2650.2021.03.011

摘要/Abstract

摘要： 【目的】为揭示川西亚高山针叶林土壤剖面碳、氮、磷和稳定碳同位素分布特征。【方法】以川西亚高山两种典型针叶林岷江冷杉林（Abies faxoniana）和粗枝云杉林（Picea asperata）为研究对象,分析其土壤剖面各层碳、氮、磷含量和稳定同位素组成特征。【结果】①川西亚高山岷江冷杉林土壤碳氮磷含量分别为35~400、2~13.5和0.2~0.6 g/kg,δ¹³C为-33.4‰~-24.1‰; 粗枝云杉林土壤碳氮磷含量分别为50~360、1~12和0.2~0.6 g/kg,δ¹³C为-37.0‰~-24.3‰;②两种林型土壤碳、氮含量均随土层深度增加而降低,磷含量在土壤有机层显著低于矿质层;③土壤碳含量与氮含量呈显著正相关,碳、氮含量均与δ¹³C呈显著负相关;④土层和林型均显著影响土壤碳、氮含量和¹³C的分布。【结论】川西亚高山针叶林土壤碳氮磷和碳稳定同位素分布特征均受到林型和土壤层次的显著影响,且碳稳定同位素组成与碳氮含量呈负相关。研究结果可为深入了解该区域针叶林森林生态系统碳和养分循环过程提供科学依据。

关键词: 针叶林, 碳氮磷, δ¹³C, 土壤, 亚高山

Abstract: 【Objective】 To understand the distribution characteristics of carbon, nitrogen, phosphorus and stable carbon isotopes in the soil profile of subalpine coniferous forests in Western Sichuan. 【Method】 Taking two typical coniferous forests in western Sichuan, Abies faxoniana and Picea asperata as the research objects, the content of carbon, nitrogen, phosphorus and stable isotopic composition of each layer of the soil profile were analyzed. 【Result】 ①The content of soil carbon, nitrogen and phosphorus in the Abies faxoniana forest in western Sichuan were 35-400, 2-13.5 and 0.2-0.6 g/kg, respectively the δ¹³C was -33.4‰--24.1‰; the content of soil carbon, nitrogen and phosphorus in the Picea asperata forest were 50-360, 1-12, and 0.2-0.6 g/kg, respectively, the δ¹³C is -37.0‰--24.3‰;②The soil carbon and nitrogen contents of the two forest types decreased with the increase of soil depth. Phosphorus content in the soil organic layer was significantly lower than that in the mineral layer;③Soil carbon content was significantly positively correlated with nitrogen content, and both carbon and nitrogen contents were significantly negatively correlated with δ¹³C;④Both soil layer and forest type significantly affected the soil carbon, nitrogen content and ¹³C distribution. 【Conclusion】 The distribution characteristics of soil carbon, nitrogen, phosphorus and stable carbon isotopes of subalpine coniferous forests in Western Sichuan were all significantly affected by forest types and soil layers, and the δ¹³C negatively correlated with carbon and nitrogen contents. The research results would provide scientific data for deeply understanding the carbon and nutrients cycling processes in subalpine coniferous forest ecosystems.

Key words: coniferous forest, CNP, δ¹³C, soil, subalpine

中图分类号:

S714.8

古韬, 王华, 刘瑞, 杨玉婷, 谭波, 张丽, 徐振锋, 李晗. 川西亚高山2种典型针叶林土壤碳氮磷和碳稳定同位素分布特征[J]. 四川农业大学学报, 2021, 39(3): 355-361.

GU Tao, WANG Hua, LIU Rui, YANG Yuting, TAN Bo, ZHANG Li, XU Zhenfeng, LI Han. Characteristics of C N P and Carbon Stable Isotope in Two Subalpine Coniferous Forests of Western Sichuan[J]. Journal of Sichuan Agricultural University, 2021, 39(3): 355-361.

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