CAJ | 학술논문

通过人工控水土培方法,研究了干旱胁迫对真桦的根系形态、分级特征、苗高生长以及生物量分配的影响。结果表明,干旱胁迫显著影响真桦根系形态及构型,随着土壤含水量的降低,真桦根系质量和平均直径降低。轻度和中度干旱使真桦根系总长度、根系表面积、比根长降低;重度干旱下,直径小于0.5 mm的细根比例显著提高,根系总长度、根系表面积、比根长显著提高。随着土壤含水量的降低,真桦苗木的高生长受到抑制,生物量降低,根冠比明显提高。
통과인공공수토배방법,연구료간한협박대진화적근계형태、분급특정、묘고생장이급생물량분배적영향。결과표명,간한협박현저영향진화근계형태급구형,수착토양함수량적강저,진화근계질량화평균직경강저。경도화중도간한사진화근계총장도、근계표면적、비근장강저;중도간한하,직경소우0.5 mm적세근비례현저제고,근계총장도、근계표면적、비근장현저제고。수착토양함수량적강저,진화묘목적고생장수도억제,생물량강저,근관비명현제고。
Effect of drought stress on root morphology,diameter scale of root system,height growth biomass allocation of Betula maximowicziana by four artificially controlled moisture gradients were studied.Result shows that root system morphology construction of Betula maximowicziana were influenced markedly by soil moisture stress.Biomass average diameter of root system in Betula maximowicziana decreased with the reduction of soil moisture.Light moderate stress reduced the total root length,root surface area special root length,while they were raised in heavy stress conditions by increasing the number of fine roots（root diameter below 0.5 mm）.Drought stress reduced the seedling height biomass of Betula maximowicziana,but significantly raised its root-shoot ratio.