不同林龄尾巨桉人工林凋落物和土壤C、N、P化学计量特征

发布时间：2018-01-24 12:23

本文关键词： 尾巨桉人工林凋落物土壤化学计量特征　出处：《热带亚热带植物学报》2017年02期 　论文类型：期刊论文

【摘要】：为正确认识桉树(Eucalyptus spp.)人工林凋落物和土壤C、N、P时空分配格局及两者间的关系,对5个林龄尾巨桉林分凋落物及土壤C、N、P含量及化学计量比进行测定分析。结果表明,凋落物的C含量均显著大于土壤,且不同林龄间凋落物C含量无显著差异,1年生人工林土壤表层(0~20 cm)的C含量显著小于3~7年生,其他土层C含量在不同林龄间差异不显著。凋落物的N含量均显著高于土壤,且1年生人工林显著大于其他林龄的,而土壤表层的N含量以7年生人工林最大,1年生的最小。凋落物的P含量除1年生人工林显著大于3年生外,其他林龄间均无显著差异,土壤的P含量在不同林龄间的差异均不显著。凋落物C∶N随林龄呈逐渐增大趋势,且显著大于土壤层。凋落物的C∶P和N∶P在不同林龄间的差异不显著,但均显著大于土壤层。凋落物的N含量与表层土壤的C、N含量呈极显著负相关,凋落物的C∶N与表层土壤的C∶P,N∶P呈显著正相关,表层土壤C、N积累受到凋落物N的制约。因此,在桉树人工林经营管理过程中如何降低凋落物分解的N限制性、提高养分传递效率及合理施肥显得十分重要。
[Abstract]:For a correct understanding of Eucalyptus (Eucalyptus spp.) Plantation Litter and soil C, N, P and the space-time distribution pattern, the 5 Lin Lingwei of Eucalyptus grandis Plantation Litter and soil C, N, were detected on P contents and chemical measurement. The results showed that the C content of litter were significantly greater than the soil, and different ages between the litter C content had no significant difference, the 1 years old plantation soil surface (0~20 cm) C was significantly less than 3~7 years old, the other soil C content in different ages had no significant differences. N content of litter were significantly higher than that of the soil, and the 1 years old plantation was significantly greater than the other ages, while the content of N in surface soil in 7 years old plantation, 1 year old minimum. P content of litter in the 1 year old plantation was significantly greater than 3 years, there were no significant differences in other age, the difference of P content in soil of different age was not significant among. Litter C N: with age increase gradually, and significantly greater than the soil litter layer. C: P and N: the difference of P in different age was not significant, but were significantly higher than that of soil layer. The content of N and soil litter C, N content was significantly negatively correlated, litter C: N and surface soil C: P, N: P was positively related to soil C, N accumulation is restricted by litter N. Therefore, how to reduce the limitation of N litter decomposition in Eucalyptus plantation management process, improve the transfer efficiency of nutrients and rational fertilization is very important.

【作者单位】：国家林业局桉树研究开发中心;
【基金】：广东省林业科技创新项目(2014KJCX021-04,2013KJCX014-03) 林业科技创新平台运行补助项目(2015-LYPT-DW-006)资助~~
【分类号】：S714
【正文快照】： 凋落物和土壤作为森林生态系统的重要组成部分,他们之间的相互作用关系研究是生态学领域的研究热点之一[1]。凋落物养分元素的化学计量特征是目前研究林地森林生态系统生产力的重要指示性指标[2]。土壤作为凋落物载体,其碳氮磷是生物体体内元素的主要来源,在生态系统物质循环

【相似文献】