环境因素驱动植物功能性状的变化,这反过来又促进了社区的恢复。社区在不同恢复阶段的环境条件不同。变化的环境因素可能会在群落水平上驱动植物功能性状的变化并影响物种的适应性。我们研究了五个不同恢复阶段的植物群落(草本植物,草和灌木,灌木,树和灌木,和树)在镇宁的喀斯特高原,贵州(研究区植被在1958-1960年森林砍伐后经历了一个逐步自然恢复的过程)。我们研究了功能性状及其与环境因素的联系。主要结果包括以下几点。(1)随着时间的推移,植物高度,叶干物质含量,树期叶片氮含量和叶片磷含量显著增加,而在乔木阶段,叶片厚度和比叶面积显着下降。(2)土壤有机碳,土壤N含量,土壤磷含量,土壤C:P和土壤C:K呈增加趋势,并且在树木阶段明显高于其他阶段。土壤钾含量波动,土壤容重逐渐下降,达到树阶段的最低值,但差异不显著。(3)在恢复过程中,功能特征从具有较高的比叶面积和较低的干物质含量和较短的株高的植物群落到具有较低的比叶面积和较高的干物质含量的植物群落的组合变化。(4)随着恢复的进行,研究区逐渐从土壤养分贫乏的环境转变为养分丰富的环境。总的来说,在喀斯特地区植物群落恢复过程中,环境因素差异很大。植物群落从积极的(资源获取)转变为保守的(环境贫瘠抗性)生态策略。土壤磷含量和土壤C:K是影响镇宁喀斯特植物群落恢复过程中功能性状变化的主要环境因子。
Environmental factors drive changes in plant functional traits, which in turn promote community recovery. The environmental conditions of the community are different at different recovery stages. Changing environmental factors may drive the changes in plant functional traits at the community level and affect species adaptation. We studied plant communities in five different recovery stages (herb, grass and shrub, shrub, tree and shrub, and tree) in the karst plateau of Zhenning, Guizhou (The vegetation in the
study area has undergone a gradual natural recovery process after the forests were deforested in 1958-1960). We studied functional traits and their links to environmental factors. The main results include the following. (1) Over time, plant height, leaf dry matter content, leaf nitrogen content and leaf phosphorus content increased significantly in the tree stage, while leaf thickness and specific leaf area decreased significantly in the tree stage. (2) Soil organic carbon, soil N content, soil P content, soil C:P and soil C:K showed an increasing trend, and were significantly higher in tree stage than in other stages. Soil potassium content fluctuated and soil bulk density decreased gradually, reaching the lowest value in the tree stage, but the difference was not significant. (3) During the restoration process, the functional characteristics changed from a combination of plant communities with high specific leaf area and low dry matter content with a short plant height to plant communities with low specific leaf area and high dry matter content with a tall plant height. (4) As recovery proceeded, the
study area gradually changed from a soil nutrient-poor environment to a nutrient-rich environment. Overall, the environmental factors vary greatly during the recovery of plant communities in karst areas. The plant community shifts from an aggressive (resource acquisition) to a conservative (environmental barrenness resistance) ecological strategy. The soil phosphorus content and soil C:K are the main environmental factors affecting the changes in functional traits during the restoration of karst plant communities in Zhenning.