西藏色季拉山冷杉林木根系营养元素的特征分析
Ana lysis on Nutr ient Character istics in the Root System ofAbies georgei var. sm ith ii in Mount Sejila of Tibet
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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. 21 g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。Abstract: The distribution of total nutrient content in the root system direction of Abies georgei var. sm ithii was inthe order of south >west > east > north, ofwhich the contents ofN、K、Fe、Mn were obvious difference among directions, and that of nutrientswas of great difference among variouswidth class of roots, the sequence of the total nutrient content in the rootswas in the order of slender roots >middle ones > thick ones. The total nutrient content in theslender rootswas 1. 46 times that in thick ones, in particular, the contents ofN,Mg, Fe, andMn had an evident rulethat in the roots of tree the total nutrient content increased with their length, and there was the obvious tendency especially in slender roots. The amount of nutrient stored in the root system of tree was influenced by biomass and nutrient content in the roots. The amount of nutrient stored in the rootswas seriallymiddle roots > thick ones > slenderones, and the amount of element stored in the roots was N > K >Mg > Ca >Mn > P > Cu >Na > Fe > Zn with therange of 1. 13～165. 21 g. The amount of abundant nutrient in the root system of fir tree per unit showed that the Nstorage wasmore than that of armand p ine ( Pinus arm andi) , while that the storage ofMgmore than that of armandp ine or Chinese p ine ( Pinus tabulaeform is) , and of the other elementswas less with the contrast to that of armandp ine, sharp tooth oak (Quercus aliena var. acutesena ta) and Chinese p ine.
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Key words:
- Tibet
- / Abies georgei var. sm ithii
- / root system
- / nutritive element
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