CAJ | 학술논문

为探讨膜下滴灌条件下水分和盐分对棉花根系空间发育的影响,在花铃期选择相同灌溉制度、咸淡水灌溉的两个膜下滴灌处理田块采集距滴灌带不同距离、不间深度上的根系样品144件.用1 mm土筛和手拣将棉花根系从土壤中筛分出来,去除死根,冲洗干净后用扫描仪扫描成tif格式图像.再用DT-SCAN软件计算根长密度.对比分析发现膜下滴灌及盐胁迫条件下,咸水灌溉的根系分布范围较大.其总根长密度比淡水大31.69 mm/cm~3,根系生长深度也远大于淡水灌溉.咸水灌溉根系分布主要受盐分胁迫,淡水灌溉根系分布主要受水分胁迫.水平方向上距滴头40 cm以远,水分胁迫对根系发育起主导作用.土壤体积含水率在20%以上、电导率在2000 μs/cm以下时可以满足根系的正常生长发育.
위탐토막하적관조건하수분화염분대면화근계공간발육적영향,재화령기선택상동관개제도、함담수관개적량개막하적관처리전괴채집거적관대불동거리、불간심도상적근계양품144건.용1 mm토사화수간장면화근계종토양중사분출래,거제사근,충세간정후용소묘의소묘성tif격식도상.재용DT-SCAN연건계산근장밀도.대비분석발현막하적관급염협박조건하,함수관개적근계분포범위교대.기총근장밀도비담수대31.69 mm/cm~3,근계생장심도야원대우담수관개.함수관개근계분포주요수염분협박,담수관개근계분포주요수수분협박.수평방향상거적두40 cm이원,수분협박대근계발육기주도작용.토양체적함수솔재20%이상、전도솔재2000 μs/cm이하시가이만족근계적정상생장발육.
In order to understand the impact of water-salt on spatial development of cotton roots under mulch drip irrigation,144 root samples were collected in the flower and boll stage for two different treatments irrigated with saline groundwater and fresh surface water using same irrigation system.Screening out cotton roots from the soil with 1 mm soil sieve and hand-picking,removing dead roots,scanning into a tif format images after washing,then the root length density was obtained through DT-SCAN software calculation.The results show that the distribution area of roots under mulch drip irrigation with saline water iS larger and total root length density(31.69 mm/cm~3)is bigger than that with fresh water.The depth of root for saline water irrigation is much greater than that with fresh water because of salt stress.Root distribution is mainly affected by salt stress under saline water irrigation;however,it is affected by water stress under fresh water irrigation.Water stress plays a leading role in root development 40 cm away from the emitter at the horizontal direction.When the volumetric water content of soil is greater than 20%and the electric conductivity is smaller than 2000 μs/cm,the root can grow and develop normally.