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稻田土壤供氮能力的解析研究
ANAL YTICAL ST UDIES ONTHE NITROGEN SUPPLYING CAPACITY OF PADDY SOILS
【摘要】 以太湖地区三种类型水稻土为对象进行的研究表明:(1)风干土淹水培养后,固定态铵平均增加17ppm,相当于交换性铵增量的28%。似应将培养后固定态铵的增量与交换性铵增量之和计为土壤氮素的矿化量。(2)田间微区试验中,耕层以下土壤所供应的氮量占稻田土壤供氮量的16—49%,平均30%。(3)根据所得结果,讨论了用培养法预测稻田土壤供氮量中存在的问题。
【Abstract】 Nitrogen supplying capacity of three types of paddy soils in Tai-lake region were studied. Results obtained showed that (1) the mean value of the increments of clay mineral-fixed ammonium after anaerobic incubation of 9 air-dried soil samples was 17 ppm, which was equivalent to 28% of the increment of the exchangeable ammonium. It seems that the sum of the increments of exchangeable and clay mineral-fixed ammonium should be taken as the nitrogen mineralization capacity of the soils capable of fixing ammonium; (2) results obtained in the field microplot experiments revealed that the contributions of subsoil to the nitrogen supplying capacity of the paddy fields ranged from 16% to 49%, with a mean value of 30%; and (3) difficulties in the prediction of nitrogen supplying capacity of a paddy field with incubation technique are discussed.
- 【文献出处】 土壤学报 ,Acta Pedologica Sinica , 编辑部邮箱 ,1988年03期
- 【被引频次】33
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