亚热带红壤侵蚀区马尾松针叶生态化学计量特征  

Stoichiometric Characteristics of Pinus massoniana Plantation in the Subtropical Red Soil Erosion Region

作　　者：张欣影[1] 宁秋蕊 李守中[1,2] 姜良超[1,2] 刘溶[1] 张昊泽[1] 陶晶晶[1] 

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]湿润亚热带山地生态国家重点实验室培育基地,福州350007

出　　处：《水土保持研究》2017年第2期156-161,共6页Research of Soil and Water Conservation

基　　金：国家科技支撑计划项目(2014BAD15B02);国家自然科学基金面上项目(31470633)

摘　　要：为了解亚热带红壤侵蚀区马尾松(Pinus massoniana)针叶碳(C)、氮(N)、磷(P)化学计量特征,在长汀河田地区选取12个样点并采集四个叶龄阶段的马尾松针叶作为研究对象,测定其C,N,P含量并分析C∶N∶P化学计量特征。结果表明:(1)叶片中C,N,P的变化范围分别为(482.15±9.35)^(512.7±6.56)mg/g,(7.35±0.75)^(10.49±1.34)mg/g,(0.21±0.04)^(0.71±0.21)mg/g。不同叶龄阶段的C,N,P含量有显著差异。C随叶龄增长整体含量增长幅度较小,变异系数仅为2.8%;N,P绝对含量较低,在叶片生长后期含量显著下降(p<0.05)。(2)C∶N∶P计量比变化与叶龄有关。N/P变化范围为(15.42±3.08)^(36.43±8.08),N/P随叶龄增加而逐渐增大,说明该地区马尾松养分限制因素的变化与叶龄有显著关系,随叶龄的增长受P限制表现更为突出。(3)马尾松针叶N,P含量有极显著正相关关系,C,P含量存在显著负相关关系,N,P元素间协同变化显著。本研究初步阐明了马尾松针叶不同叶龄阶段C,N,P化学计量特征及其变化规律,为深刻了解亚热带红壤侵蚀区先锋树种马尾松的养分利用特征和机制提供理论基础。In order to understand the distribution pattern of carbon（C）,nitrogen（N）,phosphorus（P）and the stoichiometric characteristics of Pinus massonianain the the erosion-prone areas,we selected needles of four different ages from a masson pine plantation（12sampling sites）,and analyzed their C∶N∶P contents and characteristics of C∶N∶P stoichiometry.The results showed that the average contents of C,N and P in leaves ranged from 482.15±9.35 to 512.7±6.56mg/g,from 7.35±0.75 to 10.49±1.34mg/g,and from0.21±0.04 to 0.71±0.21mg/g,respectively.With an increase of needle age,the C content increased slowly and the coefficient of variation was 2.8%,the N,P contents decreased significantly（p〈0.05）.Leaf age had the significant impact on the C,N,and P contents.Ratios of N to P ranged from 15.42±3.08 to 36.43±8.08.The ratio of N to P increased gradually with the increase of leaf age.In the region where masson pine was more severely limited in P,leaf age was correlated with the change of nutrient limiting factors.While the P content was positively correlated with N content in the needles of Pinus massoniana,there was the significant negative correlation between C and P contents.The synergy changes between N and P contents were significant.This study on C,N,P stoichiometry and its variation in the pine needles of different ages provided the theoretical basis for the better understanding of the nutrient utilization characteristics and mechanisms in the pioneer plants in areas subject to water and soil losses.

关 键 词：马尾松 叶龄 化学计量特征 亚热带 

分 类 号：S718.5[农业科学—林学]