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Difference of acid rain,soil pH value,and yield of dry-land wheat in hong dong,shanxi province

Zhao Yuliang;Ren Aixia;Yuan Shujie;Wang Xiaotai;Yin Dongjuan;Hongdong county in Shanxi Province meteorological bureau;Chengdu Information Engineering University;College of Agriculture,Shanxi Agricultural University;Hongdong county in Shanxi Province Agriculture Committee;Hongdong county Agricultural Technology Station;  
[Objective]The aim of this study was to improve the technology of the prevention of acid rain for dry-land wheat.[Methods]The field test was conducted in Wang village,Big pagoda tree town,Gaogong village,Wanan town and Dongan village,Guangshengsi town,the effect of acid precipitation during wheat growth on dry-land wheat soil pH,soil microbial biomass carbon and nitrogen and yield were researched,comparison of physiological needs each stage,the influence degree of the acid rain on crop was evaluated.[Results]When acid rain was happened,soil pH value decreased,lower amplitude of soil pH and natural precipitation and its pH value were positively correlated,that was to say:the stronger the single precipitation acidity,the greater the soil pH decreased;the greater the rainfall level,the greater the decline.But after the precipitation several days,the soil pH value could be slowly return to the relative steady original state.Although the acid rain,the soil microbial biomass carbon and nitrogen at jointing stage and booting stage and filling stage and harvest were normal.Soil microbial biomass carbon and nitrogen in depth of 0~ 10 cm was gradually larger than that in the depth of 10~20cm soil layer.Theresult also showed:The yield in Wang village,Big pagoda tree town,Dongan village,Guangshengsi town and Gaogong village,Wanan town respectively were 7 707kg·hm-2、7 545kg·hm-2、7 394kg·hm-2,compared with average yield of 3 695.1kg·hm-2 during the twelfth fiveyear,they were higher,so the effect of acid rain on yield was smaller,but group tillers of big pagoda town in condition of partial acid precipitation On April 3and April 18 were affected,but has no effect on spike growth.Correlation analysis showed that soil pH and negatively correlated with soil microbial biomass carbon of dry-land wheat and nitrogen,soil pH is close to the panicle agronomic traits at mature stage,is also closely related to the ear number and grains,which affects yield,but not significant.[Conclusion]After acid rain,the change range of soil pH value is not very obvious,and within a few days after the rain,basic could be restored the original state,within the acid rain resistance of soil,soil still was in a state of suitable for plant growth,eventually impact on wheat growth is weak,too.
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