植物生态学报

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荒漠藓类植物死亡对表层土壤酶活性的影响

张庆1,2,尹本丰2,3,李继文2,陆永兴2,荣晓莹2,周晓兵4,张丙昌4,张元明5   

  1. 1. 山西师范大学地理科学学院
    2. 中国科学院新疆生态与地理研究所
    3. 北京师范大学生命科学学院
    4. 中国科学院干旱区生物地理与生物资源重点实验室, 中国科学院新疆生态与地理研究所
    5. 中国科学院新疆生态与地理研究所, 中国科学院干旱区生物地理与生物资源重点实验室
  • 收稿日期:2021-04-07 修回日期:2021-09-12 发布日期:2021-09-18
  • 通讯作者: 张丙昌
  • 基金资助:
    国家自然科学基金项目;中国科学院西部青年学者B类项目;中国科学院西部青年学者B类项目;中国科学院青年创新促进会

Effects of death of moss-dominated biological soil crusts on soil enzyme activities

ZHANG Qing1,2, 3,4,LI JiWen2,LU YongXing2,RONG XiaoYing2,Xiao-Bing ZHOU5,Bing-Chang ZHANG6,Yuan-Ming ZHANG   

  • Received:2021-04-07 Revised:2021-09-12 Published:2021-09-18
  • Contact: Bing-Chang ZHANG

摘要: 土壤胞外酶作为土壤生物化学反应的催化剂,直接驱动了土壤物质循环和能量流动过程。全球气候变化和土地利用类型改变致使维持荒漠地表稳定的生物土壤结皮出现不同程度的死亡,然而,生物土壤结皮的死亡将如何影响荒漠表层土壤养分循环过程仍缺乏研究。本研究选取新疆古尔班通古特沙漠优势藓类结皮为研究对象,测定了自然存活及自然死亡藓类结皮下不同土层(0-2 cm, 2-5 cm, 5-10 cm, 10-20 cm)碳、氮、磷相关酶活性。结果发现:除蔗糖酶外,藓类植物死亡显著影响了β-葡萄糖苷酶、过氧化物酶、多酚氧化酶、脲酶、硝酸还原酶、植酸酶和碱性磷酸酶活性,并随着土壤深度的增加呈逐渐递减趋势。同时,藓类植物死亡显著抑制了植酸酶活性,促进了与碳氮磷循环相关的土壤酶活性。土壤碳、氮循环相关酶活性与土壤有机碳、全氮、NO3-N和NH4+-N显著正相关,与pH显著负相关;植酸酶、碱性磷酸酶与全磷、速效磷相关性不显著。荒漠藓类植物的死亡,在短期内显著改变了土壤酶系统,加速了土壤养分循环。

关键词: 生物土壤结皮, 土壤胞外酶, 养分循环, 齿肋赤藓, 古尔班通古特沙漠

Abstract: Aims The catalysis associated with extracellular enzymes are closely related to nutrient circulation and energetic flow in soils. The changes of Global climate and land use have resulted in different degree of death of moss-dominated biological soil crusts (BSCs), yet there is still little knowledge of how the death of the moss-dominated crust influence the nutrient cycling of topsoil of desert soil. Methods In this study, we measured the enzyme activities related to carbon, nitrogen and phosphorus in different soil layers (0-2 cm, 2-5 cm, 5-10 cm, 10-20 cm) of living and dead mosses. Important findings And found that moss death has a significant effect on the enzyme activities of β-glucosidase, peroxidase, polyphenol oxidase, urease, nitrate reductase, phytase and alkaline phosphatase; these activities decreased with the increase of soil depth. The moss death decreased phytase activity, and increased enzyme activities related to carbon, nitrogen and phosporus transformation. The results of correlation analyses showed that the carbon- and nitrogen-related enzyme activities were positively correlated with SOC, TN, NO3--N and NH4+-N, and negatively correlated with pH, whereas the phytase and alkaline phosphatase had no significant correlation with TP and AP. In summary, the moss death in the temperate desert changed soil enzyme system and accelerated soil nutrient cycling in a relatively short time.

Key words: Biological soil crust, Soil extracellular enzymes, Nutrient cycling, Syntrichia caninervis, Gurbantunggut Desert