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Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (1): 15-22.doi: 10.11924/j.issn.1000-6850.casb2021-0169

Special Issue: 生物技术 园艺

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Water Inorganic Anions Profiles in Stemflow of Cinnamomum camphora: Variation Characteristics

OUYANG Zeyi1,2(), OUYANG Shuolong3, LIAO Juyang1,2(), LI Qiaoyun1,2, LIU Yan1,2, OUYANG Cuilan4, WU Linshi1,2, YI Haoyu4   

  1. 1Hunan Botanical Garden, Changsha 410116
    2Hunan Chang-zhu-tan City Cluster National Research Station of Forest Ecosystem, Changsha 410116
    3Hunan Academy of Forestry, Changsha 410004
    4Forestry Bureau of Yueyang County, Yueyang, Hunan 414100
  • Received:2021-02-22 Revised:2021-11-08 Online:2022-01-05 Published:2022-02-24
  • Contact: LIAO Juyang E-mail:455281453@qq.com;liaojuyang@163.com

Abstract:

To explore the change rule of acid rain in urban forest ecosystem, this research investigates SO42-, NO3-, Cl-, NO2-, F- in both the rainwater and the stemflow of Cinnamomum camphora forest ecosystem in Changsha. The results showed that SO4 2- and NO3- were the major inorganic anions in rainwater and stemflow, which accounted for 84.36% and 90.49%-91.42% of total anion contents in the rainwater and stemflow, respectively. The ratio of SO42-/NO3- was 1.14 and 2.32-2.61 in rainwater and stemflow, respectively. The pH value of rainwater averaged 4.87 in the study area, which indicated that the rainwater was a sulfuric-nitric mixed acid rain. The leaching coefficient of each inorganic anion in stemflow of different diameter at breast height(DBH) class ranged from 1.04 to 11.41, indicating different enrichment effects. The monthly variations of each inorganic anion showed that NO2- was the most unstable one and its variable coefficient was 0.49, while F- was the most stable inorganic anion, with the variation coefficient of F- at all DBH classes was 0.24. Except NO2 -, the variation coefficient of the other 4 anions decreased with the DBH class increase, i.e. The larger the diameter, the more stable the anion content was. The contents of SO4 2-, NO3, Cl- and F- of different DBH class were all in the order of d1(8-10 cm)> d2(16-18 cm)> d3(24-26 cm)> d4(32-34 cm),while for NO2 -, the order was: d1>d4>d2>d3. The contents of SO42-, NO3-, Cl-, NO2-, F- at all DBH class showed significantly negative correlation with the precipitation, indicating that the greater the rainfall amount, the greater the decrease trend of the inorganic anion was. However, there was no significant correlation between the inorganic anion content in the stem flow and the inorganic anion content in atmospheric precipitation, showing that the inorganic anions in stemflow mainly came from dry disposition of acidoids. Therefore, the bark of Cinnamomum camphora can adsorb acid materials in air, and has positive effects on air cleaning and acid rain mitigation.

Key words: Cinnamomum camphora, inorganic anions, stemflow, diameter at breast height class, enrichment effect

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