红豆草间作四翅滨藜对土壤微生物数量及酶活性的影响

Effects of Atriplex canescens and Onobrychis viciaefolia intercropping on soil microbial quantity and enzyme activity

生物修复盐渍化土壤具有持效、稳定数量及酶活性且利于水土保持和生态平衡等优势。通过盆栽方法研究在甘肃盐渍土红豆草和四翅滨藜间作对土壤微生物的影响,结果表明:(1)1行红豆草间作1行四翅滨藜其土壤细菌、放线菌、速效磷含量均最高,分别为14.75×10~3 cfu/g,11.47×10~2 cfu/g,27.28 mg/kg;(2)2行红豆草间作2行四翅滨藜其土壤脱氢酶和碱性磷酸酶均值最小,分别为0.36μg/(g·24 h),0.80 mg/(g·24 h);(3)单作四翅滨藜其细菌、速效磷、速效钾均值最小,分别为9.76×10~3 cfu/g,19.77 mg/kg,54.42 mg/kg。经灰色关联度法综合评价得出1行红豆草间作1行四翅滨藜改土效果最佳,单作四翅滨藜次之,2行红豆草间作2行四翅滨藜效果最差。

Bioremediation of saline soil has a persistent and stable effect,it is also beneficial to the conservation of water and soil and ecological balance.The effects of intercropping of legume and chenopodiaceae on soil biological characteristics were studied in saline soil in order to reveal the dominant mechanism of Onobrychis viciaefolia and Atriplex canescens on soil enzyme activity and microbial biomass.The results showed that the soil bacteria and actinomycetes quantities,and available phosphorus content of T3 treatment(1∶1,line)were the highest,i.e.,14.75×103 cfu/g,11.47×102 cfu/g and 27.28 mg/kg,respectively on average.Soil enzyme activities of dehydrogenase and alkaline phosphatase of T4 treatment(2∶2,line)were the lowest,i.e.,0.36 g/(g·24 h),and 0.80 mg/(g·24 h),respectively on average.However,bacteria quantity,available phosphorus and potassium contents of T2 treatment(Atriplex canescens only)were the lowest,i.e.,9.76(×103)cfu/g,19.77 mg/kg and 54.42 mg/kg,respectively on average.The grey relation analysis showed that the soil improvement of T3 treatment was the best,followed by T2 treatment.