西藏色季拉山冷杉林木根系营养元素的特征分析  

Analysis on Nutrient Characteristics in the Root System of Abies georgei var.smithii in Mount Sejila of Tibet

作　　者：辛学兵[1] 孔庆云[1] 方江平[2] 

机构地区：[1]中国林业科学研究院华北林业实验中心,北京102300 [2]西藏农牧学院高原生态研究所,西藏林芝860000

出　　处：《林业科学研究》2007年第5期717-721,共5页Forest Research

基　　金：国家西藏林芝森林生态系统定位站资助项目

摘　　要：西藏色季拉山急尖长苞冷杉根系的养分总含量在不同方向的大小顺序为：南〉西〉东〉北，其中N、K、Fe、Mn等元素的含量差异显著；不同粗度级的根系，养分含量差异较大，养分总含量大小顺序为细根〉中根〉粗根，细根的总养分含量是粗根的1．46倍，其中N、Mg、Fe、Mn元素的规律性较强；随根系长度的增加，养分总含量也在增加，特别是在细根中，这种趋势尤为明显；单株林木根系养分贮量受生物量的大小和养分含量的高低影响，养分贮量的分布顺序是中根〉粗根〉细根，各元素在根系中的贮量大小依次为：N〉K〉Mg〉Ca〉Mn〉P〉Cu〉Na〉Fe〉Zn，贮量范围在1．13～165．21g之间。单位面积冷杉林木根系中大量元素贮量与华山松、锐齿栎和油松相比，只有N元素贮量高于华山松，Mg元素贮量高于华山松和油松，其它元素均低于这些树种。The distribution of total nutrient content in the root system direction of Abies georgei var. smithii was in the order of south 〉 west 〉 east 〉 north,of which the contents of N,K,Fe.Mn were obvious difference among directions, and that of nutrients was of great difference among various width class of roots, the sequence of the total nutrient content in the roots was in the order of slender roots 〉 middle ones 〉 thick ones. The total nutrient content in the slender roots was 1.46 times that in thick ones, in particular, the contents of N, Mg, Fe, and Mn had an evident rule that in the roots of tree the total nutrien ,ntent increased with their length, and there was the obvious tendency es- pecially in slender roots. The amount of ndtrient stored in the root system of tree was influenced by biomass and nutrient content in the roots. The amount of nutrient stored in the roots was serially middle roots 〉 thick ones 〉 slender ones, and the amount of element stored in the roots was N 〉 K 〉 Mg 〉 Ca 〉 Mn 〉 P 〉 Cu 〉 Na 〉 Fe 〉 Zn with the range of 1.13 - 165.21 g. The amount of abundant nutrient in the root system of fir tree per unit showed that the N storage was more than that of armand pine （Pinus armandi）, while that the storage of Mg more than that of ar- mand pine or Chinese pine （ Pinus tabulaeformis）, and of the other elements was less with the contrast to that of armand pine, sharptooth oak （Quercus aliena var. acutesenata） and Chinese pine.

关 键 词：西藏 长苞冷杉 根系 营养元素 

分 类 号：S791.14[农业科学—林木遗传育种]