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不同龄组杉木林土壤碳、氮、磷的生态化学计量特征
曹小玉, 李际平, 杨 静, 闫文德
中南林业科技大学林学院
摘要:
为了阐明不同发育阶段杉木人工林土壤的生态化学计量特征,在湖南省金洞林场选择立地因子基本一致的杉木幼龄林、中龄林、近熟林、成熟林、过熟林分别设置3块20 m × 30 m样地,在每个样地利用S形5点取样法分层(0 ~ 15、15 ~ 30、30 ~ 45、45 ~ 60 cm)采取土壤样品,用于测定土壤有机碳、全氮、全磷,并计算化学计量比。结果显示:5个龄组杉木林0 ~ 60 cm土壤有机碳、全氮、全磷的含量分别为11.02 ~ 14.74、1.65 ~ 1.84、0.26 ~ 0.35 g/kg。土壤有机碳和全氮的含量随着杉木年龄的增长表现出了先减少后增加再减少的趋势,而土壤全磷的含量则表现为先减少后增加的趋势。土壤有机碳和全氮的含量都表现为随土层加深而下降的规律,土壤有机碳下降幅度中龄林>近熟林>过熟林>成熟林>幼龄林,土壤全氮下降幅度近熟林>过熟林>中龄林>幼龄林>成熟林。而土壤全磷含量随着土层下降没有明显的变化规律。5个龄组杉木林0 ~ 60 cm土壤C:N、C:P和N:P变化范围分别为6.94 ~ 8.53、49.03 ~ 53.07和5.79 ~ 7.74,土壤C:N随着杉木年龄的增加表现出了先减少后增加的趋势,土壤C:P和N:P则表现出了先增加后降低的趋势。土壤C:P和N:P随土层下降而减少,而土壤C:N随着土层下降呈现出相对稳定的规律。
关键词:  杉木林  龄组  土壤养分  化学计量特征
DOI:10.13758/j.cnki.tr.2019.02.012
分类号:S714.2
基金项目:湖南省自然科学基金面上项目(2018JJ2673)、林学重点学科开放基金项目(2016ZD06)、多功能森林经营湖南金洞林场样板基地作业法研究及示范项目(1692017-6)、湖南省教育厅项目(16C1668)、湖南省大学生研究性和创新性实验计划项目(湘教通〔2016〕283号)和中南林业科技大学人才引进项目(2016YJ075)资助。
Stoichiometric Characterization of Soil C,N,and P of Different Age-group Chinese Fir Plantations
CAO Xiaoyu, LI Jiping, YANG Jing, YAN Wende
College of Forestry, Central South University of Forestry & Technology
Abstract:
To clarify soil stoichiometric characteristics of different age-group Chinese fir plantations, young, half mature, near mature, mature and over mature Chinese fir plantations with similar site condition were selected in Jindong forest farm of Hunan Province. Three sample plots of 20 m × 30 m were set up in each of these different age-group plantations and soil samples were collected from 0-15, 15-30, 30-45 and 45-60 cm depths, respectively, with S-shaped sampling method (5 sampling points) in each plot. The contents of soil organic carbon (SOC), total nitrogen (N), total phosphorus (P) in depth of 0-60 cm were measured, then ratios of C:N, C:P and N:P were analyzed. Results showed that the contents of SOC, N and P ranged in 11.02-14.74, 1.65-1.84, 0.26-0.35 g/kg, respectively, in different age-group Chinese fir plantations. With the increasing age, the contents of SOC and N decreased first then increased and finally decreased, the content of P decreased first and then increased. The contents of SOC and N decreased with the increase of soil depth, and the decreasing degree of SOC varied in the order of half mature>near mature>over mature>mature>young, and that of N in the order of near mature>over mature>half mature>young>mature, but the content of P varied irregularly with the increase of soil depth. Ratios of C:N, C:P and N:P ranged in 6.94-8.53, 49.03-53.07 and 5.79-7.74, respectively, in different age-group Chinese fir plantations. C:N decreased first and then increased with the increasing age, but C:P and N:P changed oppositely. C:P and N:P decreased with the increase of soil depth, while soil C:N remained stable.
Key words:  Chinese fir plantation  Age-group  Soil nutrient  Stoichiometric characteristics

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