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草业学报 ›› 2024, Vol. 33 ›› Issue (7): 25-40.DOI: 10.11686/cyxb2023310

• 研究论文 • 上一篇    下一篇

封育对伊犁绢蒿荒漠草地土壤碳氮磷、酶活性及其化学计量特征的影响

李思媛1(), 孙宗玖1,2,3(), 于冰洁1, 周晨烨1, 周磊1, 郑丽1, 刘慧霞1, 冶华薇1   

  1. 1.新疆农业大学草业学院,新疆 乌鲁木齐 830052
    2.西部干旱区草地资源与生态教育部重点实验室,新疆 乌鲁木齐 830052
    3.新疆草地资源与生态自治区重点实验室,新疆 乌鲁木齐 830052
  • 收稿日期:2023-08-31 修回日期:2023-11-09 出版日期:2024-07-20 发布日期:2024-04-08
  • 通讯作者: 孙宗玖
  • 作者简介:E-mail: nmszj@21cn.com
    李思媛(1997-),女,新疆塔城人,硕士。E-mail: breezes09@163.com
  • 基金资助:
    国家自然科学基金项目(32060408);新疆维吾尔自治区重点实验室开放课题(2022D04003);新疆维吾尔自治区自然科学基金(2020D01A60)

Effect of grazing exclusion on soil carbon, nitrogen, and phosphorus contents and enzyme activity and stoichiometry in Seriphidium transiliense desertgrasslands

Si-yuan LI1(), Zong-jiu SUN1,2,3(), Bing-jie YU1, Chen-ye ZHOU1, Lei ZHOU1, Li ZHENG1, Hui-xia LIU1, Hua-wei YE1   

  1. 1.College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,China
    2.Key Laboratory of Grassland Resources and Ecology of Western Arid Region,Ministry of Education,Urumqi 830052,China
    3.Xinjiang Key Laboratory of Grassland Resources and Ecology,Urumqi 830052,China
  • Received:2023-08-31 Revised:2023-11-09 Online:2024-07-20 Published:2024-04-08
  • Contact: Zong-jiu SUN

摘要:

明确土壤酶活性及其化学计量特征在封育恢复过程中的变化特征,对揭示土壤养分可利用性随着植被恢复的变化规律及阐明生态系统养分循环机制有重要意义。本研究通过对土壤碳氮磷、酶活性及其化学计量特征的测定,初步分析了封育6年的蒿类荒漠草地对封育措施响应的特征变化。结果表明:1)封育后蒿类荒漠草地0~20 cm土层土壤有机碳、全氮、全磷、C/P、N/P及土壤亮氨酸氨基肽酶、碱性磷酸酶,酶活性C/N均无显著变化,而4月各样地β-1,4-葡萄糖苷酶活性及7月玛纳斯样地β-1,4-N-乙酰氨基葡萄糖苷酶活性较对照呈增加趋势;2)封育显著增加了7月玛纳斯样地的C/N及4月各样地酶活性C/P,降低了7月玛纳斯样地酶活性N/P值,封育后4月各样地向量长度均显著增加,且各样地封育前后向量长度均大于45°,表明研究区土壤微生物主要受碳和磷的限制;3)冗余分析表明封育后土壤碳氮磷及其计量特征解释了土壤酶活性及化学计量特征、向量特征变异的56.03%,且结构方程模型显示封育后土壤有机碳极显著影响土壤酶活性及其化学计量特征,表明土壤有机碳可能是影响蒿类荒漠草地土壤酶活性及其化学计量特征的主要因子。

关键词: 蒿类荒漠, 土壤酶活性, 化学计量特征, 封育

Abstract:

It is important to determine the changes in soil enzyme activity and enzyme stoichiometry during grazing exclusion to understand how vegetation restoration affects soil nutrient availability, and to elucidate the mechanisms of nutrient cycling in ecosystems. In this study, therefore, the responses of soil in sagebrush desert grassland to 6 years of grazing exclusion were initially analyzed by measuring soil carbon (C), nitrogen (N) and phosphorus (P) contents, as well as soil enzyme activities and their stoichiometry. The results showed that: 1) There were no significant changes in soil organic C, total N, and total P contents, soil C/P, soil N/P, soil leucine aminopeptidase, alkaline phosphatase activities and soil enzyme C/N, in the 0-20 cm soil layer after grazing exclusion. The activities of β-1, 4-glucosidase in April and β-1, 4-N-acetylglucosaminidase in July Manasi showed an increasing trend, compared with those in the control, after grazing exclusion; 2) Grazing exclusion significantly affected the soil C/N in July Manasi, increased soil enzyme C/P in April, and decreased soil enzyme N/P values in July Manasi. In a vector analysis, the vector lengths of all samples increased significantly in April after grazing exclusion, and the vector lengths of all samples before and after grazing exclusion were greater than 45°, suggesting that the soil microorganisms in the study area were mainly limited by C and P; 3) The results of a redundancy analysis showed that soil C, N, and P contents and their stoichiometric characteristics explained 56.03% of the variance in soil enzyme activity and stoichiometric and vector characteristics after grazing exclusion. These results indicate that soil organic C content may be the main factor influencing the activity of soil enzymes and their characteristics in sagebrush desert grasslands.

Key words: sagebrush desert, soil enzyme activities, stoichiometric characteristics, grazing exclusion