水稻生长对土壤氮素矿化的影响

EFFECT OF RICE GROWTH ON THE MINERALIZATION OF SOIL NITROGEN

摘要:

淹水条件下,土壤氮素的矿化是土壤有效积温的函数.用淹水密闭培养法,预测田间种稻下土壤氮素的矿化量和矿化过程时,其准确性受到许多因素的影响.为了明确水稻生长对土壤氮素矿化的影响程度,以及不同季别的水稻在这方面的异同,我们进行了下述试验.

Abstract:

The effect of rice growth on the mineralization of soil nitrogen was investigated by pot experiment and sealed anaerobic incubation.The results obtained are summarized as follows.Except in the initial stage of mineralization,the nitrogen mineralized from soil organic matter calculated from the sum of nitrogen in whole plant (including roots) and ammonium-N in soil under rice growing condition was 29-62% higher than that in sealed anaerobic incubation being carried out under the same conditions with pot experiment,which showes that the growth of rice plant can considerably promote the mineralization of soil nitrogen.