棉 花 学 报      Cotton Science     2009，21(2)：138-143

Effects of Different Soil Salinity Levels on the Distribution of Cotton Root in Drip Irrigation under Film
GONG Jiang¹，BAO Jian-xi²，Lü Ning³，HOU Zhen-an^1*
（1.College of Agriculture，Shihezi Univerity，Shihezi,Xinjiang 832003，China；2.College of Resources and Environment，China Agricultural Univerity，Beijing 100094，China；3.Xinjiang Academy of Agricultural and Reclamation Sciences，Shihezi,Xinjiang 832000，China）

Abstract：A pot experiment was carried out to evaluate the effect of soil salinity distribution on growth and distribution of cotton root.The result showed that there was a desalted zone at 0～30 cm depth with water motion ， the desalted zone which maintained an environment of lower salinity and nutrient，and the salt accumulation zone was under 30 cm.The distribution of root in different soil salinity treatments was significantly different (P<0.05)，the total root length was 26.35 m、49.54 m and 34.40 m for EC_1.5 treatments 0.32、1.12 and 1.90 dS·m^-1, respectively，but distribution of root was different in different soil depth. The root length densities for EC_1.5 treatments 1.12 and 1.90 dS·m^-1 were significantly higher（P<0.05）than 0.32 dS·m ^-1 at 0～30 cm soil depth, in which salinity was desalted，but the root length density was decreased when soil salinity increased from 0.32 to 1.90 dS·m^-1 at 30～50 cm depth. The cotton root would adjust its distribution by salinity stress and produce compensatory effect，the root quantity in salinity desalted zone was significantly increased when the root absorbed more water and nutrient.
Key words：soil salinity；root；cotton；drip irrigation under film     [Full Text, 2638KB]