论文部分内容阅读
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。
The characteristics of the changes of soil organic carbon, NPK and K in the three age groups of Fushou forest farm and their coupling were studied. The results showed that the contents of organic carbon, total nitrogen, total phosphorus and total potassium, C / N ratio and P / C ratio in 0-60 cm soil layer of Chinese fir plantation showed higher and middle ages Stage decreased, and the stage of mature forest increased again. However, the ratio of C to K showed an increasing trend with the growth and development of Chinese fir plantation. The soil organic carbon, total nitrogen and total phosphorus contents, C / P ratio and C / K ratio in three age groups showed a decreasing trend with the depth of soil layer increasing, but the decreasing range was large at 0 ~ 45 cm cm to reduce the decline and tend to be stable. The C / N ratio remained relatively stable with the deepening of the soil layer. The contents of organic carbon, total nitrogen and total phosphorus in 0-45 cm soil layer in young, middle-aged and mature forests accounted for 91% of the total organic carbon, total nitrogen and total phosphorus in 0-60 cm soil layer, 87%, 86%, 91%, 84%, 85%, 75%, 77% and 80% respectively, indicating that organic carbon and soil nutrients are mainly concentrated in 0 ~ 45 cm soil layer. During the growth and development of Chinese fir plantations, the correlation between soil organic carbon and total nitrogen, total phosphorus and total potassium in different growth stages was not the same. However, in the three age groups, soil organic carbon and total nitrogen showed extremely Significant correlation. By comparing the standardized regression coefficients, it was found that in the young and middle-aged Chinese fir stands, the dominant factor affecting soil organic carbon in Chinese fir plantation was total nitrogen, followed by total phosphorus. In mature Chinese fir stage, the dominant organic carbon in Chinese fir plantation Factor only total nitrogen.