Yang Qi-Liang, Zhang Fu-Cang, Liu Xiao-Gang, Ge Zhen-Yang
Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Ying Yong Sheng Tai Xue Bao. 2012 May;23(5):1233-9.
To investigate the effects of alternate partial root-zone drip irrigation (ADI) on the morphological characteristics and root hydraulic conductivity of apple seedlings, three irrigation modes, i.e., fixed partial root-zone drip irrigation (FDI, fixed watering on one side of the seedling root zone), controlled alternate partial root-zone drip irrigation (ADI, alternate watering on both sides of the seedling root zone), and conventional drip irrigation (CDI, watering cling to the seedling base), and three irrigation quotas, i. e., each irrigation amount of FDI and ADI was 10, 20 and 30 mm, and that of CDI was 20, 30 and 40 mm, respectively, were designed. In treatment ADI, the soil moisture content on the both sides of the root zone appeared a repeated alternation of dry and wet process; while in treatment CDI, the soil moisture content had less difference. At the same irrigation quotas, the soil moisture content at the watering sides had no significant difference under the three drip irrigation modes. At irrigation quota 30 mm, the root-shoot ratio, healthy index of seedlings, and root hydraulic conductivity in treatment ADI increased by 31.6% and 47.1%, 34.2% and 53.6%, and 9.0% and 11.0%, respectively, as compared with those in treatments CDI and FDI. The root dry mass and leaf area had a positive linear correlation with root hydraulic conductivity. It was suggested that controlled alternate partial root-zone drip irrigation had obvious compensatory effects on the root hydraulic conductivity of apple seedlings, improved the soil water use by the roots, benefited the equilibrated dry matter allocation in seedling organs, and markedly enhanced the root-shoot ratio and healthy index of the seedlings.
为研究交替局部根区滴灌(ADI)对苹果幼苗形态特征和根系水力传导率的影响,设计了三种灌溉方式,即固定局部根区滴灌(FDI,在幼苗根区一侧固定浇水)、控制性交替局部根区滴灌(ADI,在幼苗根区两侧交替浇水)和常规滴灌(CDI,紧贴幼苗基部浇水),以及三种灌溉定额,即FDI和ADI每次灌溉量分别为10、20和30毫米,CDI每次灌溉量分别为20、30和40毫米。在ADI处理中,根区两侧土壤含水量呈现干湿交替的重复过程;而在CDI处理中,土壤含水量差异较小。在相同灌溉定额下,三种滴灌方式下浇水侧的土壤含水量无显著差异。在灌溉定额为30毫米时,与CDI和FDI处理相比,ADI处理的根冠比、幼苗健康指数和根系水力传导率分别提高了31.6%和47.1%、34.2%和53.6%、9.0%和11.0%。根干质量和叶面积与根系水力传导率呈正线性相关。结果表明,控制性交替局部根区滴灌对苹果幼苗根系水力传导率有明显的补偿效应,提高了根系对土壤水分的利用,有利于幼苗各器官干物质的均衡分配,并显著提高了幼苗的根冠比和健康指数。