Effects of different modified materials and their combinations on photosynthesis and root morphological characteristics of maize in saline-alkali soil of Hetao Plain
To explore the effects of different modified materials and their combined applications on the morphologi-cal characteristics of maize at seedling stage,an experiment was conducted on the saline-alkali land in Hetao Plain of Inner Mongolia.There were eight treatments,including control(CK),desulfurized gypsum(T1),soil amelio-rant(T2),organic fertilizer(T3),desulfurized gypsum combined with soil ameliorant(T4),desulfurized gypsum combined with organic fertilizer(T5),soil ameliorant combined with organic fertilizer(T6),and desulfurized gyp-sum combined with soil ameliorant and organic fertilizer(T7).We measured plant height,photosynthetic rate and root morphological characteristics of maize seedlings.The results showed that:(1)the T7 treatment had the stron-gest promoting effect on plant height,stem diameter and SPAD value,with an increase of 30.0％,24.2％and 27.8％,respectively.(2)The combined treatments significantly increased net photosynthetic rate,stomatal con-ductance,intercellular CO2 concentration,and leaf water use efficiency,but significantly decreased transpiration rate.The combined treatments had a better promoting effect on root morphological characteristics(total root length,surface area,number,volume)than the single treatments,with a significant increase in root branching and a sig-nificant increase in the number of lateral roots and root hairs with a diameter less than 1 mm.(3)Principal compo-nent analysis showed that the scores of maize photosynthetic performance and root morphological characteristics for different treatments were T7＞T4＞T6＞T5＞T2＞T3＞T1＞CK.In conclusion,compared with single application and combined applications of two modified materials,the combined application of three modified materials had a stron-ger promoting effect on leaf photosynthetic capacity and root morphological characteristics of maize seedlings.
soil ameliorationphotosynthesissaline-alkali landmaizeroot system
万方数据
维普
