人工调控措施下马尾松凋落叶化学质量变化及与分解速率的关系

发布时间：2019-05-01 06:26

【摘要】：马尾松凋落叶分解缓慢,促进其凋落物分解,提高养分归还速度,维持地力稳定,已成为马尾松人工林可持续经营中的关键问题。基于此,采用正交试验L_9(3~4)设计,选择菌剂、表面活性剂、不同碳氮营养液和有机肥料4种人工调控因素,在马尾松林下开展凋落叶分解调控试验,以掌握不同调控组合对凋落叶分解速率和化学质量的影响及作用效果等。结果表明:有机肥料和菌剂显著影响马尾松凋落叶分解速率,腐解剂2和鸡粪联合作用更利于分解。马尾松凋落叶在林下自然分解过程中,化学质量参数向着利于分解的方向变化,N、P以积累为主,C/N、C/P、L/N和L/P呈降低态势,人为调控措施加速了这一变化进程;不同调控措施对凋落叶化学质量参数的影响不尽相同,添加有机肥料有利于剩余凋落叶N、P含量升高,C/N、C/P、L/N和L/P的降低;菌剂腐解剂2有利于L/P、C/P的降低;表面活性剂OP-10有利于凋落叶L/N的降低。人工调控下,调控因素可通过改变凋落物化学质量影响其分解速率,N含量和C/N是影响马尾松凋落叶分解速率的主要因素;而P浓度、L/N、C/P、L/P对分解速率的影响不规律或不显著。
[Abstract]:It has become a key problem in the sustainable management of Pinus massoniana plantation that the litter decomposition of Pinus massoniana is slow, which promotes the decomposition of litter, improves the rate of nutrient return and maintains the stability of the soil. Based on this, the experiment of litter decomposition regulation under Pinus massoniana forest was carried out by orthogonal experiment with four artificial control factors, i.e., bacterial agent, surfactant, different carbon-nitrogen nutrient solution and organic fertilizer. In order to grasp the effects of different regulatory combinations on the decomposition rate and chemical quality of litter and so on. The results showed that the decomposition rate of litter of Pinus massoniana was significantly influenced by organic fertilizer and fungicide, and the decomposition was better by the combination of decomposing agent 2 and chicken manure. During the natural decomposition process of Pinus massoniana leaves under forest, the chemical quality parameters changed in the direction of favorable decomposition. The accumulation of N, P was the main factor, and C _ (N), C _ (C) P, L _ (N) and L _ (P) decreased. Man-made control measures have accelerated this process of change; The effects of different control measures on the chemical quality parameters of litter were different. The addition of organic fertilizer could increase the content of N, increase the content of P and decrease the contents of C, L, N and P in the leaves. The biodegradation agent 2 was beneficial to the decrease of L P and C P, and the surfactant OP-10 was beneficial to the decrease of L N in litter. Under artificial control, the chemical quality of litter could change the decomposition rate of Pinus massoniana. The content of N and C _ (N) were the main factors affecting the decomposition rate of litter. However, the effects of P concentration, L-N, C-P, L-P on the decomposition rate were irregular or not significant.
【作者单位】：贵州大学贵州省森林资源与环境研究中心;贵州师范大学地理与环境科学学院;
【基金】：国家科技支撑项目(2015BAD09B01) 贵州省科技重大专项(黔科合重大专项字[2012]6001号) 贵州省林业重大专项(黔林科合[2010]重大03号) 国家自然科学基金项目(41261058)
【分类号】：S714

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