Scientia Agricultura Sinica

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Effects of Maize Straw and Root Residues Added on Microbial Residue Carbon and Nitrogen in Different Fertility Levels of Black Soil #br#

MA Nan1, AN TingTing1*, ZHANG JiuMing2, WANG JingKuan1 #br#   

  1. 1College of Land and Environment, Shenyang Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources/Key Laboratory of Northeast Arable Land Conservation, Ministry of Agriculture and Rural Affair, Shenyang 110866; 2Institute of Soil Fertilizer and Environment Resources, Heilongjiang Academy of Agricultural Sciences, Harbin 150086
  • Published:2022-04-25

Abstract: 【ObjectiveCrop straw and root residues are the significance sources of soil organic matter (SOM). Exogenous carbon (C) and nitrogen (N) are assimilated by soil microorganism, accumulated as microbial necromass and contributed to relatively stable SOM. The objectives of this study were to clarify the accumulation of microbial residue C and N in different fertility levels of soil with straw and root residues addition, and qualify the contributions of microbial residue C and N to soil organic C (SOC) and total N (TN), respectively. This study would provide a basis for increasing the storage and stability of SOC and TN.Method】Based on a long-term experiment of black soil with different fertility levels, this study used the 13C15N isotope labeling and amino sugar biomarkers methods, and mixed the labeled maize straw and root residues with black soil samples. Then the mixture samples were incubated in lab, and sampled in 30 and 180 days. The percentages of exogenous C (straw C and root C) and N (straw N and root N) remaining in soil, contents of microbial residues C and N, and their contributions to SOC and TN were analyzed.Result】On the 180th day, the percentages of straw C and root C remaining in soil were, on average, 36.3% and 31.7%, and those of straw N and root N remaining in soil were, on average, 95.8% and 79.3%, respectively. On the 180th day, the ratio of the SOC derived from exogenous C (13C-SOC) to TN derived from exogenous N (15N-TN) were, on average, 17.6 and 28.5 in the soils with straw and root residue addition, respectively. The ratio of 13C-SOC to 15N-TN was decreased by 47.9% and 28.2% in the soils with straw and root residue addition on the 180th day compared with the 30th day, respectively. During the incubation, the contents of fungal and bacterial residue in the high fertility soil were, on average, 1.17 and 1.31 times those in the low fertility soil, respectively. On the 180th day, the content of microbial residue C and N (fungal and bacterial) was, on average, 8.50% higher in the soil added with straw than that in the soil added with root. On the end of incubation, the average percentage of fungal residue C contributed to SOC was 37.0% and 33.8%, and that of bacterial residue C contributed to SOC was 11.2% and 9.18% in the high and low fertility level soils, respectively. The average percentage of fungal residue C contributed to SOC was 36.0% and 34.7%, and that of bacterial residue C contributed to SOC was 55.2% and 16.3% in the soil added with straw and root on the 180th day, respectively. The average percentage of fungal residue N contributed to TN was 63.5% and 60.5%, and that of bacterial residue N to TN was 16.4% and 17.5% in low and high fertility level soils on the 180th day, respectively. The percentage of bacterial residue C and N contributed to SOC and TN was increased by 4.79% and 7.35% in the high fertility soil and by 20.3% and 32.5% in low fertility soil on the 180th day compared with the basic soil without straw addition, respectively.ConclusionThe accumulation of fungal residue is of great significance for the storage and stability of SOC and TN. Maize straw addition promotes the accumulation of microbial residues C and N in soil compared with root addition. Low fertility soil with the addition of straw and root improves the transformation of bacterial residue C and N to SOC and TN.


Key words: maize straw, maize , root residues,  , soil microbial residue,  , amino sugar,  , soil organic carbon, soil total nitrogen, black soil

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