Centre for Earth Science, Indian Institute of Science, Bangalore, Karanataka 560012, India.
Academy of Scientific and Innovative Research (AcSIR), CSIR-National Botanical Research Institute (CSIR-NBRI) Campus, Rana Pratap Marg, Lucknow 226001, India.
Sci Total Environ. 2018 Jun 1;625:1341-1350. doi: 10.1016/j.scitotenv.2018.01.061. Epub 2018 Jan 12.
The revegetation on mine spoiled lands has potential to improve the status of reclaimed mine-soil quality. However, to date the temporal dynamics of labile and stable fractions of soil organic carbon (SOC) and glomalin related soil protein (GRSP) have not been satisfactorily demonstrated. We investigated SOC and GRSP fractions including labile particulate OC (POC) and easily extractable GRSP (EE-GRSP) and stable non-particulate OC (NPOC) and difficulty extractable GRSP (DE-GRSP) along with other important soil properties in six reclaimed mine lands chronosequence (1 to 26 years old) and a reference forest site in Raniganj Coalfield, India. Our results demonstrated that the accumulation of SOC and GRSP significantly increased with increasing age of the sites, with greater extent of increment after 26 years were seen in labile POC (6.6×) and EE-GRSP (11.5×) compared to stable NPOC (1.8×) and DE-GRSP (6.2×). The higher contribution of GRSP-C in NPOC compared to TOC across the sites, indicate the proximate role of GRSP in accumulation and stabilization of SOC during the pedogenesis. The multivariate analysis revealed strong association among arbuscular mycorrhizal fungi (AMF) spore density, microbial biomass carbon, SOCs and GRSPs, suggesting the factors involved in SOC accumulation likely contributed to AMF proliferation and GRSP enrichment during the reclamation process. Moreover, strong correlation of GRSP and SOC with soil's bulk density, pH, total N and C/N ratio, suggest increasing GRSP and SOC content resulted in multi-level improvement in soil properties. Our results highlight the importance of using GRSP and SOC as indicator during mine land reclamation.
矿区复垦地的植被恢复具有改善矿区土壤质量的潜力。然而，迄今为止，土壤有机碳（SOC）和菌根相关土壤蛋白（GRSP）的不稳定和稳定分数的时间动态尚未得到令人满意的证明。我们研究了 SOC 和 GRSP 分数，包括易分解的颗粒有机碳（POC）和易提取的 GRSP（EE-GRSP）以及稳定的非颗粒有机碳（NPOC）和难提取的 GRSP（DE-GRSP），以及印度兰加纳格煤田六个复垦矿区（1 到 26 年）和一个参考森林地点的其他重要土壤特性。我们的结果表明，SOC 和 GRSP 的积累随着场地年龄的增加而显著增加，在 26 年后，易分解的 POC（6.6 倍）和 EE-GRSP（11.5 倍）比稳定的 NPOC（1.8 倍）和 DE-GRSP（6.2 倍）的增加幅度更大。与 TOC 相比，GRSP-C 在 NPOC 中的更高贡献表明，在成土过程中，GRSP 对 SOC 的积累和稳定起着直接作用。多元分析显示，丛枝菌根真菌（AMF）孢子密度、微生物生物量碳、SOC 和 GRSP 之间存在很强的关联，这表明 SOC 积累所涉及的因素可能有助于 AMF 的增殖和 GRSP 在复垦过程中的富集。此外，GRSP 和 SOC 与土壤容重、pH 值、总氮和 C/N 比之间的强烈相关性表明，GRSP 和 SOC 含量的增加导致土壤性质在多个层面上得到改善。我们的研究结果强调了在矿区复垦过程中使用 GRSP 和 SOC 作为指标的重要性。
