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应用生态学报 ›› 2020, Vol. 31 ›› Issue (3): 753-760.doi: 10.13287/j.1001-9332.202003.033

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亚热带毛竹林土壤磷组分和微生物对施氮的响应

曾泉鑫1,2, 曾晓敏1,2, 林开淼2,3, 张秋芳1,2, 程蕾1,2, 周嘉聪1,2, 林巧玉1,2, 陈岳民1,2*, 徐建国2,3   

  1. 1福建师范大学地理科学学院, 福州 350007;
    2湿润亚热带山地生态国家重点实验室培训基地, 福州 350007;
    3福建戴云山国家级自然保护区管理局, 福建泉州 362500
  • 收稿日期:2019-08-22 出版日期:2020-03-15 发布日期:2020-03-15
  • 通讯作者: E-mail: ymchen@fjnu.edu.cn
  • 作者简介:曾泉鑫, 男, 1995年生, 硕士研究生. 主要从事森林土壤研究. E-mail: 645823769@qq.com
  • 基金资助:
    本文由海峡联合基金项目(UI505233)和国家自然科学基金项目(31670620)资助

Responses of soil phosphorus fractions and microorganisms to nitrogen application in a subtropical Phyllostachys pubescen forest

ZENG Quan-xin1,2, ZENG Xiao-min1,2, LIN Kai-miao2,3, ZHANG Qiu-fang1,2, CHENG Lei1,2, ZHOU Jia-cong1,2, LIN Qiao-yu1,2, CHEN Yueh-min1,2*, XU Jian-guo2,3   

  1. 1School of Geographical Science, Fujian Normal University, Fuzhou 350007, China;
    2Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China;
    3Daiyun Mountain National Nature Reserve Administration Bureau, Quanzhou 362500, Fujian, China
  • Received:2019-08-22 Online:2020-03-15 Published:2020-03-15
  • Contact: E-mail: ymchen@fjnu.edu.cn
  • Supported by:
    This work was supported by the Strait Union Fund Project (UI505233) and the National Natural Science Foundation of China (31670620)

摘要: 磷(P)是植物和微生物生长的重要营养元素,亚热带地区土壤P有效性较低,且长期高氮(N)沉降可能会造成土壤P有效性进一步降低。本试验开展于戴云山毛竹林,分析了施N 3年对土壤的基本理化性质、P组分、微生物生物量和酸性磷酸单酯酶活性的影响。结果表明: 施N显著增加了土壤NO3--N含量,提高了土壤N有效性,但显著降低了易分解态有机磷占全磷的比例,且总有机碳与总有机P的比例>200。土壤微生物生物量碳、微生物生物量磷、酸性磷酸单酯酶活性、微生物生物量碳/微生物生物量磷和微生物生物量氮/微生物生物量磷随施N量的增加而增加。此外,易分解态有机磷占总磷比例与微生物生物量磷呈显著负相关关系。因此,施N加剧了土壤P有效性限制,提高了微生物对P的需求。

Abstract: Phosphorus (P) is an important nutrient for plant and microbial growth. Soil P availabi-lity is poor in subtropical areas. Long-term heavy nitrogen (N) deposition might further reduce P availability. The experiment was performed in a Phyllostachys pubescens forest in Daiyun Mountain. The effects of N application on soil basic physical and chemical properties, soil P fractions, microbial biomass, and acid phosphomonoesterase activity were analyzed after three years of N application. The results showed that N application significantly increased NO3--N content and thus soil N availability, while it significantly reduced the percentage of decomposable organic P to total P, with the ratio of carbon (C) to organic P being over 200. The soil microbial biomass C, microbial biomass P, acid phosphomonoesterase, and the ratio of microbial biomass N to microbial biomass P and microbial biomass C to microbial biomass P were increased as the N application rate increased. There was a significant negative correlation between the percentage of decomposable organic P to total P and microbial biomass P. Consequently, N application enhanced soil P limitation and increased microbial P demand.