摘要
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(Carexpseu—docuraica)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)。
The variation of stem diameter and internode length of Carex pseudocuraica ramets in Sanjiang Plain under different water condition (Drought : S1 &S2 ; Shallow Water : S3, S4 & 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&S2(S2〈S4 & 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 lst-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 lst2nd internodes of both stem base (except S6) and top.
出处
《西北农林科技大学学报(自然科学版)》
CSCD
北大核心
2006年第8期105-108,115,共5页
Journal of Northwest A&F University(Natural Science Edition)
基金
中国科学院知识创新工程项目(KZCX3-SW-NA-01)
关键词
三江平原
漂筏苔草
水分状态
地上茎
茎粗
节长
Carex pseudocuraica stem aboveground
stem diameter internode length water content Sanjiang Plain