【摘要】 ３种来自小麦秸杆腐解过程中产生的化感物质（阿魏酸、苯甲酸、对羟基苯甲酸），在不同浓度及不同ｐＨ条件下对硝酸还原酶活性的影响实验结果表明，阿魏酸（ｔ－ＦＡ）在０．２６、２．５８、５．１５ｍｍｏｌ／Ｌ浓度下对硝酸还原酶活性均表现出一定的抑制作用，抑制率分别为０．５２％，１１．６％和９．０２％；苯甲酸（ＢＡ）在４．０９、８．１９ｍｍｏｌ／Ｌ浓度下对硝酸还原酶的活性有抑制作用，其抑制率分别为１８．４％和６．９８％，在０．４１ｍｍｏｌ／Ｌ浓度下则表现出促进作用，促进率为３．０７％；对羟基苯甲酸（ｐ－ＨＡ）在０．３６、１．８１、３．６２ｍｍｏｌ／Ｌ浓度下对硝酸还原酶活性均表现出促进作用，促进率分别为６．８６％、１５．８％和８．７３％，其中以１．８１ｍｍｏｌ／Ｌ浓度促进作用最强．阿魏酸，苯甲酸在不同ｐＨ下（ｐＨ６、ｐＨ７、ｐＨ８）对硝酸还原酶活性均表现出一定的抑制作用，其中ｐＨ６最为明显．阿魏酸在ｐＨ６时抑制率为１１．６％，苯甲酸的抑制率为１８．４％．阿魏酸、苯甲酸和对羟基苯甲酸３种化感物质的混合液，在ｐＨ６时对硝酸还原酶活性表现出显著的促进作用，促进率为１２．７％，在ｐＨ７和ｐＨ８条件下则表现出抑制作用，抑制率分别为５?更多还原

【Abstract】 This paper described the research results on influence of trans ferulic acid (t FA),benzoic acid (BA) and p hydroxybenzoic acid (p HA) isolated from decomposition of wheat straw on the activity of nitrate reductases in different concentration and different pH. The results showed that the activity of nitrate reductases was inhibited by t FA under the concentration of 0.26, 2.58 and 5.15 mmol/L, and BA under the concentration of 4.09 and 8.19 mmol/L, the inhibition rate was 0.52%, 11.6%, 9.02%,18.4%,and 6.98%,respectively.0 41 mmol/L of BA, however, displayed some stimulation to nitrate reductases, the stimulation rate was 3.07%. The activity of nitrate reductases was stimulated by p HA under the concentration of 0.36, 1.81,3.62mmol/L, the stimulation rate was 6.86%, 15.8% and 8.73%, respectively. The more strong stimulation was observed at 1.81 mmol/L of p HA. The effect of different pH values on the activity of nitrate reductases was also studied. pH 6 for t FA and BA showed a obvious inhibition effect, the inhibition rate was 11.6% and 18.4%, respectively. The mixture of t FA,BA and p HA at pH6 showed a significant stimulation to nitrate reductases and inhibition effect at pH7 and pH8. between production of NO 2 N and residue of NO 3 N there was relationship.更多还原