Contributions of biotic and abiotic factors to soil aggregation under different thinning intensities

Ecological Indicators

Ling Wang¹  Ying Yang²  Guodong Jia²  Xinxiao Yu²  Yonge Zhang³ 

[1] Beijing Badaling Forest Farm, Beijing 102102, China;College of Water and Soil Conservation, Beijing Forestry University, Beijing 100083, China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China;

关键词: Soil aggregation;    Thinning intensity;    Biotic factor;    Soil microarthropods;    Structural equation model;   

DOI  :  

来源: DOAJ

【 摘 要 】

Soil aggregation is a hierarchical and complex process mediated by both abiotic and biotic factors, and is crucial for preventing erosion.This study aimed to providing new insights into the role of biotic and abiotic factors on soil aggregation amid various thinning intensities and exploring mechanisms of aggregation. A survey involving four thinning treatments (T0: no thinning, T10: low-intensity thinning, T20: medium-intensity thinning, and T50: high-intensity thinning) of Pinus tabulaeformis plantation was conducted to explore mechanisms of soil aggregation and quantify the significance of selected biotic and abiotic factors effects on aggregation using structural equation models. Comprehensive models that included soil physicochemical properties, microbial community, root, and microarthropods were established. Compared to no-thinning, medium-intensity thinning contained about 1.8 times more mean weight diameter (MWD). The levels of total phospholipid fatty acids (totPLFAs), arbuscular mycorrhizal fungi (AMF), mycorrhizal colonization rate (F), and total microarthropods were significantly higher in T20 than in other thinning treatments. The structural equation model indicated that the abiotic, biotic, and abiotic/biotic factors accounted for 35%, 82%, and 92% of the variation on MWD, respectively. MWD depended on the positive influence of F, totPLFAs, and AMF. Microorganisms were positively affected by total microarthropods and negatively affected by Diptera. Overall, the medium-intensity thinning (T20) was beneficial to the stability of soil aggregates. Also, biotic factors were more vital in determining soil aggregation than abiotic factors. Of note, soil microarthropods actd on aggregates by influencing microorganisms rather than directly affecting aggregation.

【 授权许可】

Unknown