三江平原湿地漂筏苔草的株高和茎粗对水分梯度的生态响应  

Ecological Response of Plant Height and Stem Diameter of Carex pseudocuraica Ramets to Water Content Gradient in Sanjiang Plain

作　　者：栾金花[1] 吕宪国[1] 邹元春[1] 张玉微[2] 

机构地区：[1]中国科学院东北地理与农业生态研究所 [2]吉林农业大学科技师范学院,长春130118

出　　处：《吉林农业大学学报》2006年第3期256-260,共5页Journal of Jilin Agricultural University

基　　金：中国科学院知识创新工程项目资助(KZCX3-SW-NA-01)

摘　　要：采用自然湿地人工模拟的方法研究了三江平原沼泽湿地漂筏苔草（Carex pseudocuraica）的生物生态学特性。结果表明：漂筏苔草的株高随淹水深度的增加而增加（从7月开始）。株高的变化在生长后期（9月）极其明显，深水处理（50cm）的株高（160cm）远高于其他水分处理，增幅较大；浅水处理（〈30cm）的株高增幅较小；干旱状态（土壤含水量20％）的株高没有增加。漂筏苔草无性株地上茎茎粗随着淹水深度的增加而增加，生长季茎粗的变化主要发生在6月份，其次是5月份和7月份，8月份茎粗变化微小（在50cm淹水状态下）。不同水分状态下茎粗停止增长的时期也有很大差异。同株漂筏苔草地上茎茎粗变化为茎基部变化较大，中部较稳定一致，靠近生长点的1～2节茎粗又变小。The biological and ecological characteristics of Carex pseudocuraica ramets in Sanjiang plain were studied with the methods of artificial simulation in natural wetland. The result showed that the sedges reproduced both in rhizomes and in reeds in natural habitats. The stems aboveground, which consist of nodes and intemodes, performed erect, semi-erect, or creeping growth forms responding to water depth. The plant height increased with the increase of water depth from July and became significant after August. The plant height （ 160 cm） and the amplitude of Deep water （50 cm） scenario were higher than Shallow Water （ 〈 30 cm） scenario, while that of Draught （20% water content） scenario did not increase and some of the sedges died. The stem diameter increased with the increase of water depth, which mainly took place before July. Generally, it varied in the 1 - 2 nodes near the stem base, kept uniform in the central section, and became thin in the 1 - 2 nodes near the growing point.

关 键 词：漂筏苔草 株高 茎粗 生态响应 湿地 三江平原 

分 类 号：Q948.112.3[生物学—植物学]