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采用液体培养法研究了供试钾细菌对江西 4种酸性土壤和陕南黄褐土中 K、P、Si、Fe、Mn、Zn等 6种元素的活化作用。结果表明 :1接种钾细菌后 ,4种酸性土壤和陕南黄褐土中的速效 K、P、Si、Fe、Mn的平均生物释放量分别为 2 0 .4,6 9.8,10 0 .4,42 .6 ,15 .9和 40 .7,40 .5 ,5 2 5 .9,199.4,81.9m g/ kg,较不接菌对照增加 10 .6 %,80 .8%,37.4%,372 .0 %,10 9.2 %和 2 2 .7%,5 2 1.6 %,172 .8%,12 0 4.0 %,131.7%,中性黄褐土中各元素的释放量及增率均高于酸性土壤 ;2钾细菌能使 40 %酸性土样中的 Zn元素发生轻度活化 ,其余酸性及中性土样中的 Zn元素固定 ;3钾细菌在液体培养过程中产酸 ,接菌后 4种酸性土壤培养液的 p H值平均降低 1.0单位 ,较对照降低14.8%,产酸可能是钾细菌活化养分的途径之一。
The activation of six K elements such as K, P, Si, Fe, Mn and Zn in four acidic soils of Jiangxi Province and yellow cinnamon soil of Southern Shaanxi Province was studied by liquid culture method. The results showed that: (1) After potassium inoculation, the average bioaccumulation rates of available K, P, Si, Fe and Mn in four acid soils and southern Shaanxi yellow cinnamon soil were 20.4, 9.8 9.8 and 10.4 , 42.6, 15.9 and 40.7, 40.5, 52.59, 199.4 and 81.9 mg / kg, respectively, increased by 10.6%, 80.8%, 37.4% and 372.0% %, 10 9.2%, 22.7%, 52.6%, 172.8%, 12.0%, 131.7% respectively. The release amount and increasing rate of each element in neutral yellow cinnamon soil were higher than those in acid soil. 2 Potassium bacteria could mildly activate Zn in 40% acidic soil samples, and fix Zn in the other acidic and neutral soil samples. 3 Potassium bacteria produced acidity in the liquid culture and cultivated in 4 acidic soils after inoculation The p H value of the liquid decreased by 1.0 unit on average, which was 14.8% lower than that of the control. Acid production may be one of the ways to activate the potassium bacteria.