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中国农学通报 ›› 2025, Vol. 41 ›› Issue (2): 69-82.doi: 10.11924/j.issn.1000-6850.casb2024-0374

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

等碳量秸秆和秸秆炭还田对棉田土壤理化性质及酶活性的影响

房佰涵(), 刘晶晶, 郭晓雯, 叶扬, 杨茂琪, 张楠, 郭慧娟, 闵伟()   

  1. 石河子大学农学院,新疆生产建设兵团绿洲生态农业重点实验室,新疆石河子 832003
  • 收稿日期:2024-05-31 修回日期:2024-10-14 出版日期:2025-01-13 发布日期:2025-01-13
  • 通讯作者:
    闵伟,男,1986年出生,安徽太和人,副教授,博士,研究方向:土壤肥力与调控。通信地址:832003 新疆石河子 石河子大学农学院,E-mail:
  • 作者简介:

    房佰涵,男,2001年出生,山东德州人,硕士研究生,研究方向:土壤肥力与养分循环。通信地址:832003 新疆石河子 石河子大学农学院,E-mail:

  • 基金资助:
    国家自然科学基金项目“生物炭对咸水滴灌棉田土壤硝化反硝化作用的影响与机制”(32160742); 兵团指导性项目“生物炭对咸水滴灌棉田土壤的改良效应研究”(2022DZ011); 石河子大学大学生研究训练计划项目“秸秆及其生物炭还田对咸水滴灌棉田土壤硝化作用的影响”(SRP2024194)

Effects of Equal Carbon Amounts of Straw and Straw Charcoal Incorporation on Soil Physical and Chemical Properties and Enzyme Activity in Cotton Fields

FANG Baihan(), LIU Jingjing, GUO Xiaowen, YE Yang, YANG Maoqi, ZHANG Nan, GUO Huijuan, MIN Wei()   

  1. Key Laboratory of Oasis Ecological Agriculture, Xinjiang Production and Construction Corps / College of Agriculture, Shihezi University, Shihezi, Xinjiang 832003
  • Received:2024-05-31 Revised:2024-10-14 Published:2025-01-13 Online:2025-01-13

摘要:

本研究以棉花秸秆资源合理利用为背景,旨在探讨等碳量条件下添加秸秆和秸秆炭对土壤理化性质及养分转化酶活性的影响,以期为干旱区滴灌棉田土壤培肥和农业可持续发展提供一定的理论依据和参考价值。试验设置3个处理:无还田(CK)、棉花秸秆还田(ST,6 t/hm2)和秸秆炭还田(BC,3.7 t/hm2)。结果表明:较无还田相比,棉花秸秆和秸秆炭均增加了显著增加土壤大团聚体占比,显著提高团聚体平均质量直径和几何平均直径,增强了团聚体的稳定性,增加了土壤孔隙度和含水量,其中,大团聚体占比和含水量分别增加了107.7%和58.5%、42.1%和28.5%,但显著降低土壤容重。较无还田相比,棉花秸秆和秸秆炭显著增加土壤阳离子交换量、有机质、全氮、碱解氮、速效磷和速效钾含量,阳离子交换量分别增加了4%和12%,其中,秸秆炭还田对阳离子交换量、有机质、碳氮比、速效磷和速效钾含量增效大于棉花秸秆还田,而对于土壤全氮和碱解氮含量的增效小于棉花秸秆还田。棉花秸秆和秸秆炭显著增加土壤蔗糖酶、β-葡萄糖苷酶、纤维素酶、脱氢酶和碱性磷酸酶活性;此外,棉花秸秆还田显著增加土壤脲酶和碱性蛋白酶活性,而秸秆炭还田则降低土壤脲酶和碱性蛋白酶活性。相关性分析表明,土壤全氮和碱解氮是促进蔗糖酶、β-葡萄糖苷酶、纤维素酶、脱氢酶和碱性磷酸酶活性的主要因子,土壤pH和容重是抑制蔗糖酶、β-葡萄糖苷酶、纤维素酶、脲酶、脱氢酶和碱性磷酸酶活性的主要因子。棉花秸秆和秸秆炭还田显著提高棉花氮素、磷素和钾素的吸收量,从而促进棉花的生长发育有利于籽棉产量显著增加,增幅分别为12.6%和10.2%。棉花秸秆和秸秆炭还田提高了大团聚体的占比,增加土壤孔隙度和含水量,降低土壤容重,改善了土壤物理结构,同时有效提升了土壤养分含量和养分转化相关酶活性,有利于促进棉花养分吸收,进而提升棉花籽棉产量。

关键词: 棉花秸秆, 秸秆炭, 土壤理化性质, 土壤酶活性, 养分吸收, 籽棉产量

Abstract:

The study investigated the impact of adding equal carbon amounts of cotton stalks and biochar to soil on soil physical and chemical properties and nutrient transformation enzyme activities, aiming to support sustainable agriculture in drip-irrigated cotton fields in arid regions. The experiment included three treatments: no residue returning (CK), cotton stalk returning (ST, 6 t/hm2) and biochar returning (BC, 3.7 t/hm2). The results showed that both cotton stalks and biochar significantly increased the proportion of large soil aggregates compared with CK, the mean mass diameter and geometric mean diameter of aggregates were significantly improved, aggregate stability was improved, and soil porosity and water content were enhanced. Large aggregates and water content increased by 107.7%, 58.5% and 42.1%, 28.5%, but the soil bulk density was significantly reduced. Compared with CK, both treatments elevated soil cation exchange capacity (CEC), organic matter, total nitrogen, alkali-hydrolyzable nitrogen, available phosphorus and available potassium, CEC increased by 4% and 12%, with biochar being more effective in enhancing CEC, organic matter, carbon-nitrogen ratio, available phosphorus and available potassium. Cotton stalks were more effective in increasing total nitrogen and alkali-hydrolyzable nitrogen. Both treatments increased the activities of soil sucrase, β-glucosidase, cellulase, dehydrogenase and alkaline phosphatase, with cotton stalks also elevating urease and alkaline protease activities, while biochar reduced them. Correlation analysis indicated that total nitrogen and alkali-hydrolyzable nitrogen were primary factors promoting activities of sucrase, β-glucosidase, cellulase, dehydrogenase and alkaline phosphatase enzyme, while soil pH and bulk density inhibited them. Both treatments significantly enhanced the absorption of nitrogen, phosphorus and potassium in cotton, promoting growth and development, and increasing cotton seed yield by 12.6% for cotton stalks and 10.2% for biochar. In conclusion, returning cotton stalks and biochar to the soil improved soil structure, increased nutrient content and enzyme activities, and promoted nutrient absorption in cotton, leading to a significant increase in cotton seed yield.

Key words: cotton straw residue, charcoal residue, soil physical and chemical properties, soil enzyme activity, nutrient absorption, cotton seed yield