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间伐对马尾松人工林根际土壤磷组分的影响

叶钰倩1,2,赵家豪1,2,刘畅1,2,关庆伟1,2*   

  1. (1南方现代林业协同创新中心,南京 210037;2南京林业大学生物与环境学院, 南京 210037)
  • 出版日期:2018-05-10 发布日期:2018-05-10

Effects of thinning on phosphorus fractions of rhizosphere soil in Pinus massoniana plantations.

YE Yu-qian1,2, ZHAO Jia-hao1,2, LIU Chang1,2, GUAN Qing-wei1,2*   

  1. (1CollaborativeInnovation Center of Sustainable Forestry in Southern China, Nanjing 210037, China; 2College of Biology and the Environment, Nanjing Forestry University Nanjing 210037, China).
  • Online:2018-05-10 Published:2018-05-10

摘要: 以南京溧水林场间伐10年后的30年生马尾松(Pinus massoniana)人工林为对象,研究了不同间伐强度(对照,未间伐,CK;弱度间伐,LIT,25%;中度间伐,MIT,45%;强度间伐,HIT,65%)对根际土壤磷组分的影响。结果表明,与对照相比,中度间伐显著降低了根际土壤全磷和有机磷含量;强度间伐显著降低了根际土壤无机磷总量,且各处理间差异显著;中度和弱度间伐增加了根际土壤酸性磷酸酶活性以及速效磷、微生物量磷和活性磷含量(H2O-Pi、NaHCO3-Pi和NaHCO3-Po),而显著降低NaOH-Po含量;间伐对稳定态磷含量(HCl-P和残留P)影响不显著。除稳定态磷外,根际土壤中磷组分含量均大于非根际,具有明显的正根际效应。土壤含水量、pH、有机质含量及酸性磷酸酶活性是影响土壤磷含量的重要因子。弱度和中度间伐有利于提高根际土壤磷的有效性。

关键词: 森林生态弹性, 火干扰, LANDIS, 气候变化, 北方森林

Abstract: We investigated the responses of phosphorus (P) fractions of rhizosphere soil to thinning in a 30-year-old Pinus massoniana plantation after 10 years of thinning. There were four thinning intensities: control (CK, 0%), low intensity thinning (LIT, 25%), moderate intensity thinning (MIT, 45%), and high intensity thinning (HIT, 65%). The results showed that MIT significantly reduced the total P and organic P concentrations, whereas HIT significantlydecreased the concentrations of inorganic P in the rhizosphere soil. LIT and MIT increased soil acid phosphatase activity, available P, microbial biomass P, and easily available P (H2O-Pi, NaHCO3-Pi and NaHCO3-Po) in rhizosphere soil, but decreased NaOH-Po. Thinning had no effect on the non-available P. Except for non-available P, all the P fractions in rhizosphere soil were higher than those in bulk soil, indicating a positive rhizosphere effect. Soil P content was closely correlated with soil moisture, pH, organic matter content and acid phosphatase activity. These results suggest that LIT and MIT improved soil P availability, which could be used asefficient management practices inP. massoniana plantations.

Key words: forest ecological resilience, climate change, boreal forest, fire disturbance, LANDIS.