摘要
对福寿林场3个龄组杉木林土壤有有机碳与氮磷钾变化特征及其耦合关系进行了研究。结果表明:在杉木林生长发育过程中,0~60 cm土壤的有机碳、全氮、全磷、全钾含量及碳氮比、碳磷比表现出了幼龄林阶段较高,中龄林阶段降低,成熟林阶段又升高的变化特征,而碳钾比随着杉木林的生长发育呈现出了增加的趋势。3个龄组杉木林土壤有机碳、全氮、全磷含量及碳磷比、碳钾比都表现出了随土层深度增加而减少的规律,但在0~45 cm下降幅度大,在45 cm以下降幅度减低并趋于稳定。而碳氮比随着土层加深保持相对稳定。幼龄林、中龄林和成熟林在0~45 cm土层有机碳、全氮、全磷含量占整个土层0~60 cm有机碳、全氮、全磷含量的百分比依次为91%、87%、86%,91%、84%、85%,75%、77%和80%,说明有机碳和土壤养分主要集中0~45 cm土层内。在杉木林生长发育过程中,土壤有机碳与全氮、全磷、全钾在不同的生长阶段其相关性不完全相同,但在3个龄组中,土壤有机碳与全氮都表现出极显著的相关性。通过比较标准化回归系数发现,在杉木幼龄林和中龄林阶段,影响杉木林土壤有机碳的主导因子是全氮,其次是全磷,在杉木成熟林阶段,影响杉木林土壤有机碳的主导因子只有全氮。
A study was conducted to investigate the variation characteristics of contents of soil organic carbon, total nitrogen(N), total phosphorous(P) and total potassium(K), as well as their coupling relationships between three age groups of Chinese fir plantations in Fushou Forest Farm of Hunan Province. Results showed that the contents of soil organic carbon(SOC), N, P, K, C:N and C:P varied in the order of mature > juvenile > medium, but an increasing trend on C:K varied in the order of medium > mature > juvenile in 0 ~ 60 cm profiles with the age increasing of Chinese fir plantations. Nevertheless, the contents of SOC, N, P, K, C:P and C:K decreased sharply with the decreasing of soil depths within 0 ~ 45 cm soil layer, but these in 45 ~ 60 cm soil layer remained stable or decreased slightly, except that C:N remained relatively stable with the increasing of soil depths. The contents of SOC, N, P of juvenile, medium and mature in 0 ~ 45 cm soil layer were 91%, 87%, 86%, 91%, 84%, 85%, 75%, 77% and 80% as much as these in 0 ~ 60 cm soil layer, respectively. This showed that soil organic carbon and soil nutrients were mainly concentrated in the 0 ~ 45 cm soil layer. The correlation between SOC and N, P and K were different, but a very significant positive correlation was found between SOC content and N in different age groups of Chinese fir plantations. By comparing the standardized regression coefficient, the main factor, which affected soil organic carbon of juvenile and medium, was N followed by P, meanwhile, N was the only factor, affecting SOC of Chinese fir plantations during the maturity stage of Chinese fir.
出处
《土壤通报》
CAS
CSCD
北大核心
2014年第5期1137-1143,共7页
Chinese Journal of Soil Science
基金
"十二五"国家科技支撑计划专题(2012BAD22B0505)
湖南省教育厅项目(12C0440)资助
关键词
杉木林
土壤有机碳
全氮
全磷
全钾
耦合关系
Chinese fir plantation
Soil organic carbon
Total nitrogen
Total phosphorous
Total potassium
Coupling relationship
