贵州月亮山5个优势树种叶片与土壤生态化学计量特征

生态化学计量学是研究生态过程和生态作用中化学元素平衡的科学,对于揭示植物对营养元素的需要和土壤的养分供给能力具有十分重要的意义。以贵州省月亮山优势树种麻栎、枫香、木荷、马尾松、杉木为研究对象,对上层、中层及下层叶片以及群落土壤进行取样,测定C,N,P含量并分析生态化学计量学特征。结果表明:(1)贵州月亮山优势树种叶片C,N,P平均含量分别为(530.06±34.12)mg/g,(14.80±2.35)mg/g,(0.98±0.14)mg/g,叶片C∶N,C∶P,N∶P平均含量分别为(37.95±2.74),(572.9±34.5),(15.93±2.11)。0—30cm土壤C,N,P平均含量分别为(33.53±3.22)mg/g,(10.92±1.52)mg/g,(0.44±0.08)mg/g。(2)贵州月亮山5个优势树种上层、中层及下层叶片的碳、氮、磷及化学计量均不存在显著差异,表明叶位对叶片C,N,P含量未产生影响。(3)贵州月亮山落叶树种C,C∶N,C∶P显著小于常绿树种,N,P含量则显著大于常绿树种。(4)贵州月亮山非喀斯特森林群落0—20cm土层C含量远低于同一纬度带的喀斯特森林,N含量远高于同一纬度带的喀斯特森林,而叶片C,N含量则相反。(5)本研究土壤C,N,P之间均表现出极显著正相关(p0.01),叶片C与土壤P表现出显著负相关(p0.05),其余均无相关关系。研究结果可为同纬度带喀斯特森林与非喀斯特森林对比研究提供科学基础。

Stoichiometry Characteristics of Leaves and Soils of Five Dominant Tress Species in Yueliang Mountain of Guizhou

Stoichiometry is a scientific method of studying the balance of chemical elements in ecological interactions and processes,which provides a comprehensive approach for the study of elements in measuring relationship between biogeochemical cycle and the pattern of ecological processes,it is of great significance to reveal the demand of plant nutrition and the ability of soil nutrient supply.The forest ecosystem of the Yuelian Mountain in Guizhou is a non karst forest,which is typical and special in Guizhou Province.This research aimed to study the stoichiometric characteristics of leaves of 5 dominant tree species(Quercus acutis sima,Liquidambar formosana,Schima superba,Pinus massoniana,Cunninghamia lanceolat) in different leaf positions and soils in their communities,which were of great significance for revealing the coupling relationship between vegetation and habitats.Taking the upper,middle and lower leaves of 5 dominant tree species and soils in their communities in the Yueliang Mountain of Guizhou,we analyzed the characteristics of ecological stoichiometry.The results showed that:(1) the average C,N,P contents of 5 dominant species in the Yueliang Mountain were 530.06±34.12 mg/g,14.80±2.35 mg/g and 0.98±0.14 mg/g,respectively,the averages of C ∶ N,C ∶ P,and N ∶ P were 37.95±2.74,572.9±34.5 and 15.93±2.11,respcectively,the average contents of C,N and P in 0-30 cm soil layer was 33.53±3.22 mg/g,10.92±1.52 mg/g and 0.44± 0.08 mg/g,respectively;(2) the contents of C,N and P and stoichiometric ratios of 5 dominant species in the upper,middle and lower layers of tress were not significant,which means the leaf position does not affect C,N and P contents;(3) C,C ∶ N,C ∶ P of tree species were less than the evergreen tree species;(4) in 0-20 cm surface soil,the C,P contents of non karst forest of Yueliang Mountain were much lower than those in the same latitude zone of the karst forest,and the N content was much higher than that in karst forest;However,leaf C,N contents were opposite;(5) correlation analysis showed that soil C,N and P were significantly positively correlated,however leaf C and soil P were not significantly positively correlated.The results can provide the scientific basis for the comparative study of karst and non karst forests in the same latitude zone.