盐碱胁迫对香樟幼苗根际土壤酶活性的影响

以2年生盆栽香樟幼苗为材料,分别施用0、50、100、200 mmol/L的Na2CO3和Na HCO3(1︰1)混合溶液,研究盐碱胁迫对香樟幼苗根际土壤酶活性的影响。结果表明:随着盐碱胁迫时间的延长,各处理土壤p H不断上升,且随盐碱处理浓度越高,p H越大;对照的脲酶活性呈不断上升的趋势,盐碱胁迫处理的脲酶活性呈先升后降的趋势,盐碱处理浓度越高,土壤脲酶活性越小;过氧化氢酶活性呈不断上升的趋势,盐碱处理浓度越高,过氧化氢酶活性越大;土壤蔗糖酶活性呈先升后降的趋势,盐碱处理浓度越高,土壤蔗糖酶活性越小;轻度(0~50 mmol/L)盐碱胁迫程度促进碱性磷酸酶活性,而重度盐碱(50~200 mmol/L)胁迫抑制碱性磷酸酶活性;0 mmol/L处理的蛋白酶活性不断上升,而盐碱胁迫抑制蛋白酶活性。盐碱胁迫影响了土壤中有效养分的转化。

Effect of Salinity-alkalinity Stress on the Rhizosphere Soil Enzyme Activity of Camphor Seedlings

The potted camphor seedlings of two years were taken as the materials and were treated by the mixed solution of salinity-alkalinity (Na2CO3︰NaHCO3 = 1︰1) with different concentrations (0, 50, 100 and 200 mmol/L), the enzyme activities and pH of rhizosphere soils were studied. The results showed that pH value of rhizosphere soil increased with the stress time and concentration of salinity-alkalinity; Urease activity of 0 mmol/Ltreatment showed an increasing trend, but those of salinity-alkalinity stress increased first and then degreased. Urease activity increased with the increase of salinity-alkalinity concentration. Catalase activity showed an increasing trend, and it also increased with the increase of salinity-alkalinity concentration. Invertase activity increased first and then decreased, and it decreased with the increase of salinity-alkalinity concentration. Alkaline phosphatase activity was promoted under slight salinity-alkalinity stress (0–50 mmol/L) but restrained under severe salinity-alkalinity stress (50–200 mmol/L). Proteinase activity of 0 mmol/L treatment showed an increasing trend, but inhibited under salinity-alkalinity stress. The conversion of available nutrients in soil and nutrient absorption by plants are influenced by salinity-alkalinity stress.