黄土高原西部针叶林植物器官与土壤碳氮磷化学计量特征  

Carbon,Nitrogen,and Phosphorus Stoichiometry in Plant Organs and Soil of Coniferous Forests on the Western Loess Plateau

作　　者：孙美美[1] 关晋宏[1,2] 岳军伟[2] 李国庆[1,2] 杜盛[1,2] SUN Meimei GUAN Jinhong YUE Junwei LI Guoqing DU Sheng(State Key Laboratory of Erosion and Dryland Farming on Loess Plateau, Northwest A ＆ F University, Yangling, Shaanxi 712100 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling , Shaanxi 712100)

机构地区：[1]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 [2]中科院水利部水土保持研究所,陕西杨凌712100

出　　处：《水土保持学报》2017年第3期202-208,共7页Journal of Soil and Water Conservation

基　　金：中国科学院战略性先导科技专项"中国森林生态系统固碳现状;速率;机制和潜力"(XDA05050202)

摘　　要：为了系统地比较分析黄土高原西部针叶林植物器官与土壤内碳(C)、氮(N)、磷(P)化学计量变化特征,选取位于黄土高原西部的甘肃省天水市、甘南州、定西市、兰州市和武威市5个地区的针叶林为研究对象,通过对乔木各器官及土壤不同深度的C、N、P元素含量及其化学计量比的分析,探讨了5个调查区针叶林生态系统化学计量特征及其相互间的相关性。结果表明:植物叶的C、N、P含量较其他器官稍高,其中C含量达到511.97~538.66g/kg;5个调查区中武威地区的植物干、枝、根的C含量显著低于其他4个地区,分别为425.0,400.58,400.55g/kg。针叶林干中C∶N在地区间差异达到显著水平(p<0.05),其他各器官内差异不显著;甘南和兰州地区的针叶林各器官间C∶N差异显著;针叶林干和根中N∶P在地区之间存在显著性差异,兰州和武威地区各器官间N∶P的差异达到显著性水平。5个调查区土壤C、N、P含量及其计量特征的差异主要存在于上层土壤(0—30cm),而较深层次土壤在各地区之间的差异较小。针叶林干中C、N、P含量两两之间均存在显著相关关系,而在针叶林叶中仅N与P含量之间存在显著相关关系;土壤表层(0—20cm)中C与N含量之间存在极显著的正相关关系。To comparatively investigate the stoichiometric characteristics of carbon（C）,nitrogen（N）,and phosphorus（P）in plant organs and soil layers of coniferous forests,we conducted plot surveys in five prefectures/cities（Tianshui,Gannan,Dingxi,Lanzhou,and Wuwei）in Gansu Province on western Loess Plateau.Contents of C,N,P,and their stoichiometric ratios in each plant organ and different depth of soil layers were analyzed,and the relationships among components in the coniferous forest ecosystems were analyzed and compared across the five study areas.The results showed that C,N,and P contents in the foliage were higher than in other organs of the trees,and C content reached 511.97～538.66g/kg.The C content in stems,branches,and roots in Wuwei was 425.04g/kg,400.58g/kg,and 400.55g/kg,respectively,being significantly lower than those in the other four areas.The differences in C∶N among study areas were only significant for stems（p〈0.05）.Significant differences in C∶N among different organs of the conifers were found in Gannan and Lanzhou.The N∶P in stems and roots of the conifers were significantly different among study areas,whereas the differences in N∶P among organs were only significant in Lanzhou and Wuwei.Differences in the contents and stoichiometric characteristics of soil C,N,and P among the five survey areas were mainly detected in the 0-30 cm soil layers,while the deeper soil layers showed little difference among study areas.In addition,C,N,and P contents in stems of the conifers were significantly correlated with each other,while a significant correlation was only detected between N and P contents in leaves.SoilCand N contents in the surface layer（0-20cm）showed a significant positive correlation.

关 键 词：黄土高原西部 针叶林 碳氮磷 化学计量学特征 

分 类 号：X171.1[环境科学与工程—环境科学]