Key laboratory of Forest Plant Ecology, Northeast Forestry University, Harbin, 150040, P.R. China.
Urban forest and urban wetland group, Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, P.R. China.
Sci Rep. 2017 Oct 11;7(1):13003. doi: 10.1038/s41598-017-12731-7.
Despite vital importance in soil conditioning and a proxy for arbuscular mycorrhizal (AMF), glomalin-related soil protein (GRSP) contribution to soil carbon and nutrients at vertical soil profiles and underlying mechanism were not well-defined yet. Thus, 360 soil samples were collected from 72 farmland 1-m soil profiles in northeastern China, and soil physiochemical properties, nutrients, glomalin characteristics, local climates were determined. Linear decreases of glomalin amounts were observed from the top to deep soils, and glomalin/SOC (glomalin ratio to total SOC) in the 80-100 cm soil (EEG, easily-extracted GRSP, 2.2%; TG, total GRSP, 19%) was 1.34-1.5-fold higher than did in the 0-20 cm soil. Different statistical analyses crosschecked that the lower pH and higher SOC usually accompanied with the higher EEG and TG, while EEG was more sensitive to climates; Moreover, glomalin was more physiochemical-regulated in the deep soils, but more nutrient-regulation was found in the surface soils. Structure Equation Model showed that soil depths and climates indirectly affected TG and EEG features through soil properties, except significant direct effects on EEG. In future, glomalin assessment should fully consider these for identifying the AMF importance in the whole 1-m profile, and our findings also favor degrade soil improvement from glomalin rehabilitation.
尽管在土壤调理和丛枝菌根（AMF）的替代物方面具有重要意义，但有关球囊霉素相关土壤蛋白（GRSP）对垂直土壤剖面中土壤碳和养分的贡献及其潜在机制仍不明确。因此，在中国东北地区的 72 个农田 1 米土壤剖面中采集了 360 个土壤样本，并测定了土壤理化性质、养分、球囊霉素特征和当地气候。从土壤表层到深层，球囊霉素的含量呈线性下降，80-100cm 土壤中的球囊霉素/SOC（球囊霉素与总 SOC 的比值）（EEG，易提取 GRSP，2.2%；TG，总 GRSP，19%）比 0-20cm 土壤高 1.34-1.5 倍。不同的统计分析相互印证，较低的 pH 值和较高的 SOC 通常伴随着较高的 EEG 和 TG，而 EEG 对气候更敏感；此外，深层土壤中球囊霉素受理化因素调控较多，而表层土壤中受养分调控较多。结构方程模型表明，土壤深度和气候通过土壤性质间接影响 TG 和 EEG 特征，除了对 EEG 有显著的直接影响外。在未来，球囊霉素评估应充分考虑这些因素，以确定整个 1 米剖面中 AMF 的重要性，我们的研究结果也有利于从球囊霉素修复的角度改善退化土壤。
