Zhu Baoguo, Kuang Enjun, Meng Qingying, Feng Haoyuan, Wang Miao, Zhong Xingjie, Wang Zhichun, Qiu Lei, Wang Qingsheng, Wang Zijie
Jiamusi Branch, Academy of Agricultural Sciences of Heilongjiang/Key Laboratory of Breeding and Cultivation of Main Crops in Sanjiang Plain, Jiamusi 154007, China.
Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China.
Plants (Basel). 2025 May 22;14(11):1581. doi: 10.3390/plants14111581.
Albi-boric argosols, mainly distributed in the Sanjiang Plain of Heilongjiang Province, China, accounting for over 80% of the total cultivated land area, is characterized by a nutrient-deficient layer beneath black soil. This study addresses the challenges of modern agriculture by investigating the impact of straw incorporation on soil dissolved organic carbon (DOC) and its structures in albi-boric argosols, profiles, using fluorescence excitation-emission spectroscopy and parallel factor analysis (PARAFAC). Three treatments were applied: undisturbed albi-boric argosols (C), mixed albic and illuvium layers (M), and mixed albic and illuvium layers with straw (MS). Results showed that the yield of M and MS increased by 9.9% and 13.0%, respectively. There was a significant increase in DOC content, particularly in the MS treatment. Fluorescence index (FI) values ranged from 1.65 to 1.86, biological index (BIX) values were less than 1, and humification index (HIX) values were below 0.75, indicating a mix of plant and microbial sources for DOC, autochthonous characteristics, and weaker humification degree. PARAFAC identified two/three individual fluorophore moieties that were attributed to fulvic acid substances, soluble microbial products, and tyrosine-like substances, with microbial products as the dominant component. This study demonstrates the effect of improving barrier soil and maintaining sustainable agriculture by enhancing soil quality.
白浆型硼质淋溶土主要分布在中国黑龙江省的三江平原，占总耕地面积的80%以上，其特点是黑土之下有一个养分缺乏层。本研究通过使用荧光激发-发射光谱法和平行因子分析（PARAFAC），研究秸秆还田对白浆型硼质淋溶土剖面中土壤溶解有机碳（DOC）及其结构的影响，以应对现代农业面临的挑战。设置了三种处理：原状白浆型硼质淋溶土（C）、白浆层与淀积层混合（M）、白浆层与淀积层混合并添加秸秆（MS）。结果表明，M和MS处理的产量分别提高了9.9%和13.0%。DOC含量显著增加，尤其是在MS处理中。荧光指数（FI）值在1.65至1.86之间，生物指数（BIX）值小于1，腐殖化指数（HIX）值低于0.75，表明DOC有植物和微生物来源的混合、自源特征以及较弱的腐殖化程度。PARAFAC识别出两个/三个单独的荧光团部分，分别归因于富里酸物质、可溶性微生物产物和类酪氨酸物质，其中微生物产物为主要成分。本研究证明了通过提高土壤质量改善障碍土壤和维持可持续农业的效果。
