Variation law of stem diameter and internode length above ground of Carex pseudocuraica ramets under different water content
2006
Luan Jinhua | Zou Yuanchun | Lv Xianguo
chinois. 采用自然湿地人工模拟的方法，研究了不同水分状态下三江平原沼泽湿地漂筏苔草 (Carex pseudocuraica) 无性株地上茎粗和节间长度的变化。结果表明，漂筏苔草地上茎的茎粗随着土壤含水量和淹水深度的增加而增大，在5～9月份，不同水分状态下漂筏苔草茎粗的增幅为干旱状态(S1和S2)＜浅水状态(S3，S4和S5)＜深水状态(S6)；同株漂筏苔草地上茎粗变化为茎基部1～3节变化较大，中部较稳定一致，靠近生长点的1～3节又变细；一般茎基部1～2个节间(S6除外)和靠近顶端生长点1～2个节间较短，多数水分状态下从第3节以后的中部茎节间较长，且随着土壤含水量的增加和水位的加深而加长，其规律为S1＜S4＜S5＜S6(S6倒1节除外）。
Afficher plus [+] Moins [-]anglais. The variation of stem diameter and internode length of Carex pseudocuraica ramets in Sanjiang Plain under different water condition (Drought: S1 and S2; Shallow Water: S3, S4 and S5; Deep Water: S6) were studied with the method of artificial simulation in natural wetland. The results showed that the increment amplitude of stem diameter behaved as S1 and S2＜S3, S4 and S5＜S6. Of the same ramet, the stem diameter varied in the stem base, kept uniform in the central section, and became thin in the 1st-3rd node near the growing point. The internonde length of central section after the 3rd node from the base, which increased with soil water content and water depth (S1＜S4＜S5＜S6, except the last node of S6), was longer than 1st-2nd internodes of both stem base (except S6) and top.
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