摘要
为研究黄土丘陵沟壑区植物生长的养分限制因素,探讨油松各器官养分供应状况及其对环境因子的适应规律,以黄土高原东北缘山西省大同市新荣区典型油松(Pinus tabulaeformis)人工林为研究对象,探讨纯林及与柠条(Caragana korshinskii)混交模式的油松,叶、枝、根的C、N、P质量分数及其计量比的变化特征和影响因子。结果表明:①油松纯林及油松柠条混交林中枝C质量分数均显著低于叶、根C质量分数,而叶N、P质量分数均显著高于枝、根的N、P质量分数;与柠条混交可显著提升油松叶C、根N质量分数,而叶、枝P质量分数均显著降低;油松各器官N质量分数及N、P质量分数比均较低(N、P质量分数比<14),严重受到N限制。②各器官C、N、P质量分数相关性较弱,但与纯林相比,与柠条混交可加强油松各器官C、N、P之间的联系。③冗余分析(RDA)结果表明,叶和根化学计量对环境较为敏感,受到冠层因子和土壤因子的共同影响;叶、枝、根的主要环境贡献因子各有不同,但均受到土壤N质量分数的限制;与纯林相比,与柠条混交模式的油松各器官均向N、P质量分数比高的方向偏移。④油松不同器官化学计量的特征各有不同,且对C、N、P养分的吸收存在各自的平衡机制。目前该区油松器官N质量分数较低,受N限制较严重,但与柠条混交可以一定程度上缓解器官受N限制的困境,对该区人工造林具有重要意义。
In order to study the nutrient limiting factors of plant growth in the loess hills and ravines,and explore the nutrient supply status of various organs of Pinus tabulaeformis and their adaptation patterns to environmental factors,taking the typical P.tabulaeformis plantation in Xinrong District,Datong City,Shanxi Province on the northeast edge of the loess plateau as the research object,we discussed the changing characteristics and influencing factors of C,N and P mass fractions and their stoichiometric ratios of leaves,branches and roots of P.tabulaeformis in pure forest and mixed mode with Caragana korshinskii.The results showed that:(1)The contents of branches C in pure P.tabulaeformis forests and mixed P.tabulaeformis and C.korshinskii forests were significantly lower than that of leaves and roots,while the contents of leaf N and P were significantly higher than that of branches and roots;Mixing with C.korshinskii can significantly increase the contents of leaves C and roots N,but significantly decrease the contents of leaves and branches P.The content of N and the ratio of N to P in all organs of P.tabulaeformis were low(the ratio of N to P is less than 14),which was seriously limited by N.(2)The correlation of the contents of C,N and P in different organs was weak,but compared with pure forests,mixing with C.korshinskii can strengthen the connection among the elements of C,N and P in different organs of P.tabulaeformis.(3)Redundancy analysis(RDA)showed that the stoichiometry of leaves and roots was sensitive to the environment and was influenced by both canopy factors and soil factors.The main environmental contribution factors of leaves,branches and roots are different,but they are all limited by soil N content.Compared with pure forests,all organs of P.tabulaeformis mixed with C.korshinskii shifted to the direction with higher mass fraction ratio of N and P.(4)The stoichiometric characteristics of different organs of P.tabulaeformis were different,and the absorption of nutrients C,N and P had its own equilibrium mechanism.Now,N content of organs of P.tabulaeformis in this area is low,which is seriously limited by N.However,mixing with C.korshinskii can alleviate the dilemma of organs limited by N to some extent,which is of great significance to artificial afforestation in this area.
作者
王洁茹
石文凯
达安
吴会峰
闫佳兴
韩海荣
Wang Jieru;Shi Wenkai;Da An;Wu Huifeng;Yan Jiaxing;Han Hairong(Beijing Forestry University,Beijing 100083,P.R.China;Shanxi Provincial Forestry and Grassland Engineering General Station)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2023年第11期95-101,124,共8页
Journal of Northeast Forestry University
基金
国家重点研发计划项目(2019YFA0607304)
林业科技创新平台运行补助项目(2020132075)。
关键词
晋北黄土丘陵区
油松
造林模式
化学计量特征
环境因子
Loess hilly area in northern Shanxi
Pinus tabulaeformis
Afforestation model
Stoichiometric characteristics
Environmental factors
