近自然经营对马尾松人工林生态系统碳储量的影响

Effects of Close-to-Nature Managementon CarbonStorage of Pinus massoniana Plantation Ecosystem

关键词:  近自然经营  马尾松人工林  林分发展阶段  生态系统碳储量

Key words:  close-to-nature management  Pinus massoniana plantation  stage of stand development  carbon storage of ecosystem

摘要:

探究近自然经营对马尾松(Pinus massoniana)人工林生态系统碳储量的影响，可为马尾松林固碳増汇和可持续经营提供实践基础和科学依据。本研究以贵州省贵阳市开阳县龙岗镇马尾松人工林为研究对象，采用成对t检验方法对比分析近自然经营10余年后不同林分发展阶段马尾松人工林对照林分和近自然经营林分(以下简称“经营林分”)中植被层、枯落物层、土壤层碳储量的变化规律。结果表明：①近自然经营能够改变马尾松人工林生态系统不同层次碳储量的占比，但是生态系统碳储量总体依然呈现土壤层＞乔木层＞枯落物层＞灌木层＞草本层的分配规律。②马尾松人工林在不同林分发展阶段生态系统碳储量均为经营林分显著大于对照林分，表明近自然经营后相对较长的时期内能够有效提升生态系统碳储量。③植被层碳储量在中龄林阶段经营林分显著大于对照林分；枯落物层碳储量在3个林分发展阶段对照林分和经营林分无显著差异；土壤层碳储量在近熟林阶段经营林分显著大于对照林分。综上，近自然经营对马尾松人工林生态系统固碳能力的提升具有一定效果，后续还可以通过补植枫香(Liquidambar formosana)、白栎(Quercus fabri)和麻栎(Q.acutissima)等乡土阔叶树种来提高物种多样性，促进马尾松林生态系统林分生长和碳累积。本研究对马尾松林及其他人工林的经营管理具有一定的科学参考意义。

Abstract:

The study on the effects of close-to-nature management on carbon storage of Pinus massoniana plantation ecosystem can provide practical and scientific bases for carbon sequestration and sustainable management of P.massoniana plantation.This study took P.massoniana plantation in Longgang Town,Kaiyang County,Guiyang City,Guizhou Province,as the research object.The paired t-test was conducted to compare the carbon storage of the vegetation layer,litter layer and soil layer in the control stand and the close-to-nature management (hereinafter referred to as “management”) stand of P.massoniana plantation at different development stages after nearly 10 years of close-to-nature management.The results showed that:①Close-to-nature management changed the proportion of carbon storage at different layers of the plantation ecosystem,while the overall distribution of carbon storage in the ecosystem still followed the pattern of soil layer>tree layer>litter layer>shrub layer>herb layer.②The carbon storage of P.massoniana plantation at different stand development stages was significantly higher in the management stand than in the control stand,indicating that the carbon storage of the ecosystem can be effectively improved in a relatively long period after the close-to-nature management.③The carbon storage in the vegetation layer was significantly higher in the management stand than in the control stand in the middle-age stage.The carbon storage in the litter layer showed no significant difference between control and management stands at the three development stages.The carbon storage in the soil layer was significantly higher in the management stand than in the control stand in the near mature stage.In conclusion,close-to-nature management has the effect of improving the carbon sequestration of P.massoniana plantation ecosystem.Subsequently,local broad-leaved tree species such as Liquidambar formosana,Quercus fabri and Q.acutissima can be replanted to enhance species diversity and promote stand growth and carbon accumulation in the P.massoniana ecosystem.This study provides scientific reference for the management of P.massoniana plantation and other plantations.