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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (12): 7-13.doi: 10.11707/j.1001-7488.20141202

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Long-Term Effects of Harvest Residue Management on Soil and Foliar δ15N of Chinese Fir Plantations

Liu Ruiqiang1,2, He Zongming3, Huang Zhiqun1,2, Fan Shaohui4, Wan Xiaohua1,2, Du Ting5, Su Huiqin5   

  1. 1. Cultivation Base of Key Laboratory of Humid Subtropical Mountain Ecology Fuzhou 350007;
    2. College of Geographical Science, Fujian Normal University Fuzhou 350007;
    3. Forestry College, Fujian Agriculture and Forestry University Fuzhou 350002;
    4. International Center for Bamboo and Rattan Beijing 100102;
    5. Xiayang State Forest Farm of Fujian Province Nanping 353005
  • Received:2014-06-14 Revised:2014-11-04 Online:2014-12-25 Published:2015-01-08

Abstract:

We measured the changes of δ15N in the mineral soil (0-40 cm layers) in Chinese fir (Cunninghamia lanceolata) plantations which were subjected to five harvest residue management treatments in subtropical China between 1999 and 2011. These treatments included: burning residue, whole tree harvest plus forest floor removal, whole tree harvest, stem only harvest and double residue. The results showed that there were no significant differences in soil δ15N at any age of the plantation among treatments. Soil δ15N in 0-10 cm layers presented significantly positive correlation with litter production, and significantly negative correlation with microbial biomass nitrogen, respectively. There were no significant differences in foliar δ15N, foliar 15N enrichment factors (δ15Nfoliar-δ15Nsoil), foliar nitrogen and phosphorus concentrations, and nitrogen/phosphorus ratio at age of 15 years among treatments. Soil and foliar δ15N presented significantly negative correlations with soil total nitrogen(TN), and hot water extractable nitrogen in 0 to 10 cm layers, respectively. But, ANOVA showed that harvest residue management had no significant effects on soil TN, hot water extractable nitrogen and microbial biomass nitrogen in the 15-years-old plantation, and litter production at any age of years. These observations suggested that the long-term effect of harvest residue management on nitrogen cycling in soil was not significant in subtropical China.

Key words: Chinese fir, nitrogen cycling, harvest residue management, δ15N

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