Abstract: In order to study the effect of biomass carbon input to corn seedling's growth and photosynthesis physiology feature which cultivated on saliferous gray desert soil. The saliferous soil with biomass carbon inputs were manipulated in the lab:there were three salinization levels in gray desert soil:level 1 was low salinization,level 2 was medium salinization and level 3 was high salinization,with different weight percentage of biomass carbon inputs:0(CK),1%,2%,4% and 8%. On these medium,the corn were cultivated to analyze the effect of biomass carbon input to corn seedling's growth and photosynthesis physiology features. The corn's growth,SPAD and Pn were investigated during the seedling stage. The results showed that:under the salt stress,contents of corn leaves' chlorophyll and photosynthesis metabolism were all suppressed,and these induced the inhibition of corn growth,dry matter accumulation and leaf area per plant. Biomass carbon inputs could release the suppression which induced by salt stress to corn growth.with 8% biomass carbon input,the level 1 saliferous soil had the best accelerate effects to corn's growth. Compared With CK,the dry matter accumulation,SPAD and leaf area were increased 116.22%,36.09% and 107.67% accordingly, Meanwhile,Pn,Tr and Gs were higher than CK 76.60%,57.76% and 17.33% accordingly, When 2% biomass carbon input to level 2 saliferous soil,compared with CK,the dry matter accumulation,SPAD and leaf area of corn were increased 138.04%,18.92% and 23.50% accordingly, Meanwhile,Pn,Tr and Gs were higher than CK 78.48%,55.56% and 26.23% accordingly,in the level 3 saliferous soil which have 8% biomass carbon input,corn had the highest dry matter accumulation and leaf area per plant,which were 483.33% and 92.32% compared with CK,in another hand,in level 3 saliferous soil which have 4%biomass carbon input,SPAD was highest,71.50%higher than CK.In level 3 saliferous soil which have 8% biomass carbon in-put,corn seedling leaves' Pn,Tr and Gs were higher than CK 120.00%,88.78% and 17.39% accordingly. The biomass carbon input to saliferous soil could induced the mineral content change of soil,improved the soil's water holding capacity; these could be good for chlorophyll content of plant and boosting the photosynthesis metabolism. Biomass carbon input to saliferous soil could release the plant's growth supression effect which induced by salt stress,and could be used in saliferous soi l amelioration.

Key words: Biomass carbon, Saliferous gray desert soil, Corn seedling, Photosynthesis physiology

CLC Number: 

• S513.01