Urban forest soil is often disturbed by rapid urbanization. Organic mulching is effective for improv-ing soil quality and aggregate stability. This study evalu-ated how soil binding agents changed aggregate stability through organic mulching in urban forest soils. Three treat-ments were applied in Jiufeng National Forest Park, Bei-jing: (1) no organic mulch (control); (2) wood chips alone (5 cm thickness); and, (3) wood chips + wood compost (This mulch was divided into two layers, the upper layer of wood chips (2.5 cm), the lower layer wood compost (2.5 cm)). Soil samples were collected from the surface 10- cm soil layer and fraction into four aggregates. Glomalin-related soil protein and soil organic carbon were measured in bulk soil and the four aggregates. The results show that wood chips + wood compost increased the proportion of large and small macroaggregates, mean weight diameter and geomet-ric mean diameter. The total and easily extractable glomalin-related soil protein were higher in the wood chips + wood compost. However, soil organic carbon was lower in the wood chips alone application compared to the controls and wood chips + wood compost. Easily extractable / total glo-malin-related soil protein and glomalin-related soil protein / soil organic carbon ratios of wood chips alone and wood chips + wood compost had increased trend compared to the controls but did not reach significant levels ( p > 0.05). Mean weight diameter and geometric mean diameter correlated positively with total and easily extractable glomalin-related soil protein but were not positively correlated with soil organic carbon, the ratios of easily extractable and total glo-malin-related soil protein, and the ratios of glomalin-related soil protein and soil organic carbon. Redundancy analysis revealed that total glomalin-related soil protein was the most important driver for soil aggregate stability, especially the total glomalin-related soil protein of small macroaggre-gates. The results suggest that wood chips + wood compost enhanced soil aggregate stability through the increase of glo-malin-related soil protein. Wood chips alone cannot enhance soil aggregate stability in urban forests in the short term.

Wei Zhou;Xiangyang Sun;Suyan Li;Tiantian Du;Yi Zheng;Zhihui Fan

College of Forestry,Beijing Forestry University,Beijing 100083,People's Republic of China

林业研究（英文版）

[1]Wei Zhou;Xiangyang Sun;Suyan Li;Tiantian Du;Yi Zheng;Zhihui Fan-.Effects of organic mulching on soil aggregate stability and aggregate binding agents in an urban forest in Beijing, China)[J].林业研究（英文版）,2022(03):1083-1094

Jiufeng,Glomalin,macroaggregates,Easily,malin,macroaggre

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