Alteration of soil carbon and nitrogen pools and enzyme activities as affected by increased soil coarseness

文献类型： 外文期刊

第一作者： Wang, Ruzhen

作者： Wang, Ruzhen;Lu, Linyou;Liu, Heyong;Feng, Xue;Han, Xingguo;Jiang, Yong;Lu, Linyou;Yu, Guoqing;Creamer, Courtney A.;Dijkstra, Feike A.;Han, Xingguo

作者机构：

期刊名称：BIOGEOSCIENCES （ 影响因子：4.295； 五年影响因子：4.787 ）

ISSN： 1726-4170

年卷期： 2017 年 14 卷 8 期

页码：

收录情况： SCI

摘要： Soil coarseness decreases ecosystem productivity, ecosystem carbon (C) and nitrogen (N) stocks, and soil nutrient contents in sandy grasslands subjected to desertification. To gain insight into changes in soil C and N pools, microbial biomass, and enzyme activities in response to soil coarseness, a field experiment was conducted by mixing native soil with river sand in different mass proportions: 0, 10, 30, 50, and 70% sand addition. Four years after establishing plots and 2 years after transplanting, soil organic C and total N concentrations decreased with increased soil coarseness down to 32.2 and 53.7% of concentrations in control plots, respectively. Soil microbial biomass C (MBC) and N (MBN) declined with soil coarseness down to 44.1 and 51.9 %, respectively, while microbial biomass phosphorus (MBP) increased by as much as 73.9 %. Soil coarseness significantly decreased the enzyme activities of beta-glucosidase, N-acetylglucosaminidase, and acid phosphomonoesterase by 20.2-57.5 %, 24.5-53.0 %, and 22.2-88.7 %, used for C, N and P cycling, respectively. However, observed values of soil organic C, dissolved organic C, total dissolved N, available P, MBC, MBN, and MBP were often significantly higher than would be predicted from dilution effects caused by the sand addition. Soil coarseness enhanced microbial C and N limitation relative to P, as indicated by the ratios of beta-glucosidase and N-acetyl-glucosaminidase to acid phosphomonoesterase (and MBC: MBP and MBN: MBP ratios). Enhanced microbial recycling of P might alleviate plant P limitation in nutrient-poor grassland ecosystems that are affected by soil coarseness. Soil coarseness is a critical parameter affecting soil C and N storage and increases in soil coarseness can enhance microbial C and N limitation relative to P, potentially posing a threat to plant productivity in sandy grasslands suffering from desertification.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序