滇东岩溶高原不同恢复阶段云南松林叶片-枯落物-土壤碳氮磷化学计量特征  

Stoichiometric characteristics of carbon, nitrogen, and phosphorus in leaf litter soil of Pinus yunnanensis forest during different restoration stages in the karst plateau of eastern Yunnan

作　　者：陈培云 范弢 何停 户红红 CHEN Peiyun;FAN Tao;HE Ting;HU Honghong(Faculty of Geography,Yunnan Normal University,Kunming 650500,China;Yunnan Key Laboratory of Plateau Geographical Process and Environmental Change,Kunming 650500,China)

机构地区：[1]云南师范大学地理学部,昆明650500 [2]云南省高原地理过程与环境变化重点实验室,昆明650500

出　　处：《应用与环境生物学报》2022年第6期1549-1556,共8页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(41661004)资助。

摘　　要：以滇东岩溶坡地不同恢复阶段云南松林(纯林、人工混交林、天然次生林)为研究对象,以元江栲原生林和小铁仔灌丛作为参照样地,对5种植被类型中的叶片-枯落物-土壤中的C、N、P含量和化学计量比特征进行研究.结果表明:(1)3种云南松林都呈现为高C(432.27 g/kg)、低N(10.28 g/kg)、P(0.96 g/kg)的格局,5种植被类型的叶片-枯落物-土壤C、N、P含量基本都表现为叶片>枯落物>土壤,C/N、C/P、N/P值则都表现为枯落物>叶片>土壤,叶片和枯落物的养分含量和化学计量比值与土壤间差异显著.(2)3种云南松林对于养分的吸收同化能力差异不大,但天然次生林的枯落物质量最好,人工混交林的土壤N、P有效性最高,云南松林内受N的胁迫作用强于原生林和灌丛.(3)植物叶片-枯落物-土壤中C、N、P及其化学计量比间相关性显著,互馈机制明显.研究区内土壤C、N、P化学计量特征受土壤pH、团聚体颗粒、含水率、容重和硝态氮影响显著.因此,滇东岩溶高原云南松植被恢复过程中主要受N胁迫作用,提高枯落物养分回流是云南松植被恢复与经营的关键要素.(图4表3参41)We evaluated Pinus yunnanensis forests(pure forests, artificial mixed forests, and natural secondary forests) at different stages of restoration on karst slopes in eastern Yunnan, China;Castanopsis orthacantha primary forest and Myrsine africana shrub were used as reference plots. The C, N, and P contents and their stoichiometric ratios in the leaf litter soil of the five types of forest were investigated. The results showed that:(1) all the three P. yunnanensis forests had a pattern of high C(432.27 g/kg) with low N(10.28 g/kg) and P(0.96g/kg). The contents of C, N, and P in the leaf litter soil of the five forest types from high to low were as follows:leaf > litter > soil, while the values of C/N, C/P, and N/P from high to low were as follows: litter > leaf > soil. The nutrient content and stoichiometric ratios of leaves and litter were significantly different from those of the soil.(2)The nutrient absorption and assimilation capacity of the three P. yunnanensis forests showed little difference,but the natural secondary forests had the best litter quality, and the artificial mixed forests had the highest soil N and P availability. P. yunnanensis forests were more stressed by N than primary forests and shrubs.(3)Plant leaf-litter-soil C, N, and P were significantly correlated with their stoichiometric ratios, and the mutual feedback mechanism was obvious. The stoichiometric characteristics of soil C, N, and P in the study area were significantly affected by soil pH, aggregate particles, water content, volume, weight, and nitrate nitrogen. The vegetation restoration of P. yunnanensis in the karst plateau of eastern Yunnan was mainly affected by N stress,which is the key factor for vegetation restoration and management of P. yunnanensis to improve the nutrient backflow of litter.

关 键 词：叶片-枯落物-土壤 化学计量特征 影响因子 云南松 滇东高原 

分 类 号：S791.257[农业科学—林木遗传育种]