草浆造纸木质素对土壤性质和小白菜生长的影响

Soil Properties and Cabbage Growth as Influenced by Application of Lignins Derived from Straw Pulping

草浆造纸废液是影响秸秆造纸发展的重要因素,利用小白菜盆栽试验研究了施用麦秸造纸废液木质素和麦秸对土壤性质及小白菜生长的影响,以期为造纸废弃物的资源化利用提供依据。结果表明,两茬小白菜收获后,铵木素配施N肥使土壤pH值降低;小白菜两茬连作后铵木质素配施的土壤活性有机碳含量及多酚氧化酶活性分别为2.73g·kg-1和1.77mg·g-1·2h-1,显著高于其他处理;除对照和单施氮肥外,两茬盆栽收获后土壤多酚氧化酶活性均高于第一茬试验。两茬小白菜收获后秸秆配施和碱木质素配施氮肥土壤过氧化物酶活性均高于其他处理。铵木质素配施及秸秆配施的小白菜干重相近,显著高于碱木质素配施。研究表明,与秸秆还田相比,施用铵木质素没有对土壤性状和小白菜生长产生不利影响,故铵法草浆木质素可以作为一种潜在的土壤有机改良剂应用。

The effluent waste is an important limiting factor to straw pulping and paper-making industry.A pot experiment was conducted with continued two harvests of Chinese cabbage to study the effects of application of wheat straw and lignin waste composites derived from wheat straw pulping on soil properties and cabbage growth.The results showed that a declined soil pH and significantly higher soil liable organic carbon content（2.73 g·kg-1） and polyphenol oxidase activity（1.77 mg·g-1·2h-1） were found with applying ammonium lignosulfonate plus N fertilizer.Compared with the measurements after the first harvest,soil polyphenol oxidase activity was found to be higher after the second harvest when wheat straw or straw lignin applied.The application of wheat straw plus N or kraft lignin plus N fertilizer had a higher soil peroxidase activities compared with ammonium lignosulfonate plus N or no organic materials used.Similar dry biomass weights of cabbage were obtained with applying ammonium lignosulfonate plus N and wheat straw plus N,which were significantly higher than with Kraft lignin plus N.It was suggested that soil and cabbage plant was not negatively affected by application of ammonium lignosulfonate derived by straw pulping comparing with wheat straw plow down and the lignin from ammonium sulfate straw pulping process could be used as one of potential organic soil amendments.