Soil organic carbon and nitrogen dynamics induced by continuous maize cropping compared to maize-soya bean rotation
文献类型： 外文期刊
第一作者： Dou, X.
作者： Dou, X.;Li, F.;Li, F.;Cheng, X.;Zhu, P.
作者机构：
期刊名称：EUROPEAN JOURNAL OF SOIL SCIENCE （ 影响因子：4.949； 五年影响因子：4.626 ）
ISSN： 1351-0754
年卷期： 2018 年 69 卷 3 期
页码：
收录情况： SCI
摘要： Agricultural measures that alter soil carbon (C) and nitrogen (N) dynamics might affect biogeochemical cycling. We combined soil chemical fractionation with isotope analyses to investigate C and N dynamics of soil organic matter pools (SOMP) after 25years of cropping with the application of manure. Soil samples (0-20- and 20-40-cm depths) were taken from the control (CK, i.e. the initial soil condition) and two cropping treatments: continuous maize (Zea mays L.) (MM) and maize-soya bean (Glycine max (L.) Merr.) rotation (MS). Samples were separated into recalcitrant and labile fractions and analysed for C and N content, delta C-13 and delta N-15 values, and soil C and N recalcitrance indices (RIC and RIN). Long-term MM and MS cropping with manure application increased the soil organic carbon (SOC) storage considerably (1852.69gCm(-2) on average) because of enhanced recalcitrant C (RC) and labile C (LC). Soil organic nitrogen (SON) storage (166.79gCm(-2) on average) was also increased in MM and MS treatments from the accumulation of recalcitrant N (RN). In contrast, labile N (LN) was reduced in soil under MM and MS compared with CK. Storage of SOC was greater for MS than MM, but RIC was larger for MM than MS in the top layer, indicating that MM cropping might be more effective for future soil C sequestration because of the greater proportion of stable C stored. The RIN values were larger in cropped soil than in CK at 0-20-cm depth. Moreover, the delta C-13 values indicated that the turnover rates of soil C were faster in MS than in MM. The more enriched delta N-15 values and decreased C:N ratios of SOMP occurred in soil under MM than under MS, indicating a greater loss of soil N with MM cropping.
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