CAJ | 학술논문

2009年调查研究了三峡库区长寿段消落带的狗牙根(Cynodon dactylon L.)种群,探讨了库区水位变化对低位狗牙根种群的影响.结果表明,156 m处狗牙根地下茎的总茎长、总茎节数和总茎节数/总茎长大于150 m处的狗牙根,分别比后者多20.3%、30.1%、11.3%;而其地下茎的总芽数/总茎长、萌芽数和萌芽率分别比后者低7.5%、34.3%、74.9%.同时,156m处狗牙根分株的株数、茎长、叶宽、叶长低于150m处的狗牙根,分别比后者少了26.2%、10.8%、19.0%、37.9%;其茎节数、茎节数/茎长、叶片数、根长较大,分别比后者增加了18.7%、34.2%、10.0%、22.6%.156m处狗牙根植株分株的鲜质量、干质量、鲜质量/总鲜质量、干质量/总干质量分别比150 m处的狗牙根低32.5%、13.2%、18.2%和14.2%;其地下茎的鲜质量、干质量、鲜质量/总鲜质量、干质量/总干质量分别比后者高5.8%、17.5%、27.2%、15.2%;且前者的分株、地下茎和根的干鲜质量比均分别比后者高29.6%、12.5%和17.6%.表明,库区水位变化显著促进了150 m处狗牙根地下茎茎节伸长、芽形成、芽萌发和分株的生长.因而,低位狗牙根对库区水位变化具有较强的适应能力.
2009년조사연구료삼협고구장수단소락대적구아근(Cynodon dactylon L.)충군,탐토료고구수위변화대저위구아근충군적영향.결과표명,156 m처구아근지하경적총경장、총경절수화총경절수/총경장대우150 m처적구아근,분별비후자다20.3%、30.1%、11.3%;이기지하경적총아수/총경장、맹아수화맹아솔분별비후자저7.5%、34.3%、74.9%.동시,156m처구아근분주적주수、경장、협관、협장저우150m처적구아근,분별비후자소료26.2%、10.8%、19.0%、37.9%;기경절수、경절수/경장、협편수、근장교대,분별비후자증가료18.7%、34.2%、10.0%、22.6%.156m처구아근식주분주적선질량、간질량、선질량/총선질량、간질량/총간질량분별비150 m처적구아근저32.5%、13.2%、18.2%화14.2%;기지하경적선질량、간질량、선질량/총선질량、간질량/총간질량분별비후자고5.8%、17.5%、27.2%、15.2%;차전자적분주、지하경화근적간선질량비균분별비후자고29.6%、12.5%화17.6%.표명,고구수위변화현저촉진료150 m처구아근지하경경절신장、아형성、아맹발화분주적생장.인이,저위구아근대고구수위변화구유교강적괄응능력.
To investigate influence of water level fluctuating of Three Gorges reservoir on Cynodon dactylon population in low water level zone, C. dactylon population in Changshou area were studied in 2009. Results showed that total stem length, total node number and the ratio (total node number to total stem length) ofC. dactylon rhizomes in 156 m water level zone were more than those in 150 m water level zone, which increased 20.3%, 30.1% and 11.3%, respectively. And total buds number to total stem length ratio, ger-minated buds number and germination rate of the former rhizomes were 7.5%, 34.3% and 74.9% lower than those of the latter, re-spectively. At the same time, plant number, stem length, leaf width and leaf length of the former ramets were lower than those of the latter, decreased 26.2%, 10.8%, 19.0% and 37.9%, respectively. And node number, node number to node length rate, leaf number and root length of the former ramets were more than those of the latter, with the increase of 18.7%, 34.2%, 10.0% and 22.6%, respec-tively. Furthermore, fresh mass, dry mass, fresh mass to total fresh mass ratio and dry mass to total dry mass ratio of the former ramets decreased 32.5%, 13.2%, 18.2% and 14.2% respectively compared with the latter. Instead, the promotion of the former rhi-zomes correspond to 5.8%, 17.5%, 27.2% and 15.2% respectively. Moreover, the former ratio of dry-to-fresh mass of the former ramets, rhizomes and roots were 29.6%, 12.5% and 17.6% more than those of the latter, respectively. It indicated that water level fluctuating enhanced rhizomes' nodes elongation, buds formation and germination, and ramets growth of C. dactylon in 150m water level zone. So, C. dactylon has a strong adaptability to water level fluctuating in Three Gorges reservoir.