福建三明格氏栲天然林林窗凋落物-土壤的生态化学计量特征

发布时间：2018-08-20 09:34

【摘要】：在前期调查的基础上,在福建三明的格氏栲(Castanopsis kawakamii Hay.)天然林内划分不同尺度的林窗(大林窗、中林窗和小林窗,平均面积分别为199.29、78.53和37.86 m2),并以非林窗为对照,研究林窗内凋落物-土壤C、N、P和K的生态化学计量特征,并运用冗余分析(RDA)方法探讨了凋落物-土壤生态化学计量特征之间的关联性。结果显示:大林窗的凋落物C含量、N含量、C∶N比、C∶P比、C∶K比、N∶P比和N∶K比以及土壤C含量、N含量、P含量、K含量和C∶N比均最高,小林窗的凋落物P和K含量以及土壤C∶P比、C∶K比、N∶P比和N∶K比均最高,但各尺度林窗间凋落物和土壤的P∶K比总体差异不明显。在相同尺度林窗中,凋落物的C、N和P含量以及C∶N比、C∶P比、C∶K比、N∶K比和P∶K比总体上均显著高于土壤,但凋落物的K含量则显著低于土壤。与非林窗相比,小林窗的凋落物P和K含量以及土壤C含量、C∶N比、C∶K比和N∶K比,中林窗的土壤P含量,大林窗的土壤C、N和P含量以及C∶N比、C∶K比和N∶K比均显著提高,但各尺度林窗内凋落物-土壤的其他生态化学计量特征均显著降低。RDA分析结果显示:大林窗的凋落物P∶K比、中林窗的凋落物N∶P比和P含量以及小林窗的凋落物P含量对土壤肥力影响最大,而非林窗的凋落物C、P和K含量均对土壤肥力影响较大;且大林窗和中林窗的凋落物P含量和N∶P比分别与土壤P含量和N∶P比呈负相关,小林窗和非林窗的凋落物P含量和N∶P比分别与土壤P含量和N∶P比呈正相关。综合分析表明:格氏栲天然林不同尺度林窗内凋落物-土壤生态化学计量特征有较大差异,其中,大林窗的土壤肥力较高,且林窗土壤肥力主要受凋落物中P含量的限制。建议根据林窗内土壤N∶P比采取适宜的施肥管理措施,以促进植物生长并丰富物种多样性。
[Abstract]:On the basis of previous investigation, (Castanopsis kawakamii Hay.) of Castanopsis kawakamii in Sanming, Fujian Province, was established. The natural forest was divided into different scales of gaps (large, middle and small forest gaps with an average area of 199.2978.53 and 37.86 m2, respectively). The ecostoictic characteristics of litter-soil CNNP and K in forest gaps were studied by using non-forest gaps as control. The correlation between litter and soil ecological stoichiometric characteristics was studied by redundancy analysis (RDA) method. The results showed that the C content and N content of litter were higher than that of C: P ratio and C: K ratio, N: K ratio and N: K ratio, C content, N content, P content and C _ (1) N ratio of soil were higher than that of C _ (10) N ratio and C _ (1) N ratio. The contents of P and K in litter and the ratio of N: K and N: K in soil C: P were the highest, but there was no significant difference in P: K ratio of litter and soil between different scales. In the same scale, the contents of C ~ (+) N and P in litter and C _ (1 / N) were significantly higher than that of C _ (1) P than C _ (1) P than C _ (10) K and C _ (10) K and P: K were significantly higher than those of soil, but the K content of litter was significantly lower than that of soil. Compared with the non-forest gap, the litter P and K contents and the soil C content in the small forest window were C: n than C: K and N: K, and P content in the soil of the middle forest window. The contents of C _ N and P in the soil and the ratio of C _ (1) N to C _ (1) N and C _ (10) N were significantly higher than those of C _ (1) K and N _ (10) K. The results of RDA analysis showed that the litter P: K ratio of the large forest gap was significantly lower than that of the other ecological stoichiometric characteristics of soil. The N: P ratio and P content of the middle forest window and the litter P content of the small forest window had the greatest influence on soil fertility, while the litter C _ (1) P and K content of the non-forest window had a great influence on soil fertility. There was a negative correlation between P content and N: P ratio in soil, and there was a positive correlation between P content and N: P ratio in litter and N: P ratio in small forest window and non-forest window, and P content and N: P ratio were positively correlated with soil P content and N: P ratio, respectively. The comprehensive analysis showed that there were great differences in the characteristics of litter and soil ecostoichiometry in different scales of the natural forest of Castanopsis kawakamii. The soil fertility of the large forest window was higher, and the soil fertility was mainly limited by the P content in the litter. In order to promote plant growth and enrich species diversity, appropriate fertilization management measures should be taken according to N: P ratio of soil in forest gap.
【作者单位】：福建农林大学海峡自然保护区研究中心;福建农林大学福建省高校生态与资源统计重点实验室;三明莘口格氏栲自然保护区管理站;
【基金】：国家自然科学基金资助项目(31770678;31770678) 福建省自然科学基金资助项目(2015J05051)
【分类号】：S714

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