不同林窗马尾松凋落叶与土壤养分变化研究

发布时间：2018-05-06 15:19

本文选题：马尾松人工林 + 林窗　；参考：《植物研究》2017年01期

【摘要】：以现有42年生的马尾松(Pinus massoniana)人工纯林,经过采伐形成4种不同大小有效面积的林窗(100、400、900和1 600 m2)为研究对象,以未经采伐的42年生马尾松人工纯林为对照样地,采用凋落叶分解袋法,研究不同大小有效面积林窗对马尾松凋落叶、土壤C、N、P及化学计量比和养分损失率的影响。研究结果表明:(1)不同大小有效面积林窗下的马尾松凋落叶、土壤C、N、P含量及养分损失率除土壤P含量和马尾松凋落叶P养分损失率外,均存在显著差异。随着林窗有效面积G1~G4的增大,马尾松凋落叶C、N、P含量均呈降低趋势,三者均在G3林窗体现出较小值。马尾松凋落叶C、N、P养分损失率、土壤C、N、P养分含量多呈抛物线趋势,且均在G2或G3林窗体现出最大值。(2)不同大小有效面积林窗下的马尾松凋落叶、土壤C/N/P均存在显著差异。随着林窗有效面积G1~G4的增大,马尾松人工林土壤C/N/P基本呈抛物线变化趋势,土壤C/N在G3林窗出现最大值,土壤C/P、N/P均在G2林窗体现出最大值;土壤C/N、C/P、N/P变异系数分别为13.31%、16.51%、17.21%。马尾松凋落叶C/N、C/P均在G3体现出最小值。(3)马尾松凋落叶C、N含量与土壤C、C/N/P及环境因子的相关性较强,P含量与它们的相关性较弱;C/N与土壤P、C/N/P及环境因子的相关性较强,C/P、N/P与土壤C/P及环境因子的相关性较强;C、N养分损失率与土壤C、C/N、C/P及环境因子的相关性较强,P养分损失率与土壤C、N、P含量及其化学计量比和环境因子的相关性较弱。土壤C、N、P含量及其化学计量比与环境因子的相关性较强。
[Abstract]:The artificial pure forest of Pinus massoniana, which is 42 years old, was used as the research object, and four kinds of plantations with different effective areas, 100400,900 and 1 600 m2, were harvested. The artificial pure forest of 42-year-old Pinus massoniana, which was not harvested, was used as the contrast field. The effects of forest gaps of different effective areas on the soil C ~ (+ +) N ~ (+ +) P, stoichiometric ratio and nutrient loss rate of Pinus massoniana (Pinus massoniana) were studied by the method of litter leaf decomposition bag. The results showed that there were significant differences in soil Con N P content and nutrient loss rate except P content in soil and P nutrient loss rate in litter leaves of Pinus massoniana under different effective area forest windows. With the increase of the effective area of forest G1~G4, the content of C ~ (+) N ~ (+) P of Pinus massoniana litter leaves decreased, and all of them showed a smaller value in the G3 forest window. The nutrient loss rate of Pinus massoniana in litter leaves and the nutrient content of C ~ (2) N ~ (+) P in soil showed parabola trend, and the maximum value was found in G _ 2 or G _ 3 forest windows. There were significant differences in soil C/N/P among the litter leaves of Pinus massoniana under different effective area forest windows. With the increase of G1~G4, the soil C/N/P of Pinus massoniana plantation showed a parabola change trend, the maximum value of soil C / N appeared in the G3 forest window, and the maximum value of soil C / P / N / P was in the G2 forest window, and the coefficient of variation of soil C / N / P / P / P was 13.31% 16.51% and 17.21 1, respectively. C / N / P in litter leaves of Pinus massoniana showed a minimum value in G3. (C / N content in litter leaves of Pinus massoniana was strongly correlated with soil C / N / N / P and environmental factors, and P content was weakly correlated with soil P / N and soil P / P / N / P and environmental factors.) the correlation between C / N content and soil C / P / N / P and environmental factors was stronger than that of C / P% P / P content in litter leaves of Pinus massoniana var. massoniana. The correlation between C / P and environmental factors was stronger than that between C / N nutrient loss rate and soil C / N N / P loss rate and environmental factor. The correlation between nutrient loss rate and soil C / N P content, stoichiometric ratio and environmental factor was weak. The content and stoichiometric ratio of C ~ (2 +) N ~ (+) P in soil were strongly correlated with environmental factors.
【作者单位】：四川农业大学林学院生态林业研究所;生态林业工程重点实验室;长江上游生态安全协同创新中心;
【基金】：国家自然科学基金(31370628)~~
【分类号】：S714

【相似文献】