Soil-derived exogenous ash (EA) poses a challenge toward lignocellulosic autohydrolysis due to its buffering capacity. Previous works focusing on this phenomenon have failed to also investigate the role that soluble salts, and organic matter plays in this system. Herein, sodium phosphate and sodium humate were employed as model buffering compounds representing soluble salts and organic matter and dosed into a de-ashed wheat straw (DWS) autohydrolysis process to show the potential impacts of WS attached soil conditioners on the WS autohydrolysis efficiency which would further affect the enzymatic digestibility of autohydrolyzed WS. Results showed that with the increasing loadings of sodium phosphate and sodium humate resulted in elevated pH values (from 4.0 to 5.1 and from 4.1 to 4.7, respectively). Meanwhile, the reductions of xylan removal yields from ~ 84.3–61.4% to 72.3–53.0% by loading (1–30 g/L) sodium phosphate and sodium humate during WS autohydrolysis lead to a significant decrease of cellulose accessibilities which finally lead to a reduction of the enzymatic digestibility of autohydrolyzed WS from ~ 75.4–77.2% to 47.3–57.7%. The existence of different types soil conditioner model compounds results in various component fractions from autohydrolyzed WS in the process of autohydrolysis. A lack of sufficient xylan removal was found to drive the significant decrease in enzymatic accessibility. The results demonstrated the various effects of two typical tested soil conditioners on WS autohydrolysis and enzymatic hydrolysis.

中文翻译：

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揭示土壤调节剂模型化合物对小麦秸秆自水解效率和酶水解的影响。

由于其缓冲能力，土壤衍生的外源灰分 (EA) 对木质纤维素自水解提出了挑战。以前关注这一现象的工作也未能研究可溶性盐和有机物在该系统中的作用。在此，磷酸钠和腐植酸钠被用作代表可溶性盐和有机物的模型缓冲化合物，并被添加到脱灰麦秸 (DWS) 自水解过程中，以显示 WS 附着的土壤调理剂对 WS 自水解效率的潜在影响，这将进一步影响自水解WS的酶消化率。结果表明，随着磷酸钠和腐植酸钠负载量的增加，pH 值升高（分别从 4.0 到 5.1 和从 4.1 到 4.7）。同时，通过在 WS 自水解过程中加载（1-30 g/L）磷酸钠和腐植酸钠，木聚糖去除率从 ~ 84.3-61.4% 降低到 72.3-53.0%，导致纤维素可及性显着降低，最终导致自水解 WS 的酶消化率从 ~ 75.4-77.2% 到 47.3-57.7%。不同类型土壤调理剂模型化合物的存在导致在自水解过程中自水解的WS产生不同的组分馏分。发现缺乏足够的木聚糖去除导致酶可及性显着降低。结果证明了两种典型的测试土壤调理剂对 WS 自水解和酶水解的各种影响。在 WS 自水解过程中通过加载（1-30 g/L）磷酸钠和腐植酸钠 0% 导致纤维素可及性显着降低，最终导致自水解 WS 的酶消化率从 ~ 75.4-77.2% 降低到 47.3- 57.7%。不同类型土壤调理剂模型化合物的存在导致在自水解过程中自水解的WS产生不同的组分馏分。发现缺乏足够的木聚糖去除导致酶可及性显着降低。结果证明了两种典型的测试土壤调理剂对 WS 自水解和酶水解的各种影响。在 WS 自水解过程中通过加载（1-30 g/L）磷酸钠和腐植酸钠 0% 导致纤维素可及性显着降低，最终导致自水解 WS 的酶消化率从 ~ 75.4-77.2% 降低到 47.3- 57.7%。不同类型土壤调理剂模型化合物的存在导致在自水解过程中自水解的WS产生不同的组分馏分。发现缺乏足够的木聚糖去除导致酶可及性显着降低。结果证明了两种典型的测试土壤调理剂对 WS 自水解和酶水解的各种影响。不同类型土壤调理剂模型化合物的存在导致在自水解过程中自水解的WS产生不同的组分馏分。发现缺乏足够的木聚糖去除导致酶可及性显着降低。结果证明了两种典型的测试土壤调理剂对 WS 自水解和酶水解的各种影响。不同类型土壤调理剂模型化合物的存在导致在自水解过程中自水解的WS产生不同的组分馏分。发现缺乏足够的木聚糖去除导致酶可及性显着降低。结果证明了两种典型的测试土壤调理剂对 WS 自水解和酶水解的各种影响。