The effects of nitrogen fertilizer on the contents of TOC, POC, SMBC and WSOC in two kinds of sandy substrates

Abstract

Abstract: The effects of continuous nitrogen fertilizer application on the contents of TOC (total organic carbon), POC (particulate organic carbon), SMBC (soil microbial biomass carbon) and WSOC (water-soluble organic carbon) under two types of marginal lands (gross sandy soil and pure sand) were studied using switchgrass planted in PVC pipes. Nitrogen fertilizer exerted significant effects on root dry weight, contents of TOC, POC, SMBC and WSOC at different soil depths of both gross sandy soil and pure sand (P<0.05). In both soil depths of the two types of substrates, the contents of TOC, POC and SMBC all reached a maximum under the N₄ gradient, while the WSOC content decreased. For all nitrogen concentrations there was no significant difference in the vertical distribution of root dry weight, contents of TOC, POC, SMBC and WSOC under both types of substrate. The maximum of all indexes appeared at the 0-60 cm depth.

CLC Number:

S143

ZHU Yi, HOU Xin-cun, WU Ju-ying, DUAN Liu-sheng, FAN Xi-Feng. The effects of nitrogen fertilizer on the contents of TOC, POC, SMBC and WSOC in two kinds of sandy substrates[J]. Acta Prataculturae Sinica, 2013, 22(2): 38-46.

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