Impact of Continuous Chinese Fir Monoculture on SoilEnglish Full Text
YANG Yu-Sheng, LIU Chun-Jiang, W. KUTSCH, CHEN Guang-Shui and YU Xin-Tuo College of Geography Science, Fujian Normal University, Fuzhou 350007 (China). E-mail: ffcyys@public. npptt,fj. cn College of Forestry, Fujian Agriculture and Forestry University, Nanping 353001 (China) Ecology Center, University of Kiel, Schauenburgerstr. 112, 24118 Kiel (Germany)
Abstract: Soil properties were investigated in sites where three succeeding generations of Chinese fir （Cunning-hamia lanceolata （Lambert） Hooker） in Nanping, Fujian, China, were cultivated in order to show the impact of a repeated monoculture on site productivity. Compared with the first generation （FG） stand the soil structure deteriorated in the second generation （SG） and the third generation （TG） stands. For instance, the destruction rate of the peds increased by 55%-115% in the SG and the TG stands compared to the FG stand. Soil nutrient storage and nutrient availability also decreased in the SG and the TG stands. For surface soils of 0-20 cm, the organic matter content, total N and P, and available N and P decreased by 3%-20% relative to those in the FG stand. For many soil parameters, the differences between the FG stand and the SG and the TG stands were statistically significant （LSD test, P ＜ 0.05）. Furthermore, with each succeeding generation of Chinese fir, the total number of soil microbes declined, the soil enzyme activity weakened, and the soil biological activity decreased. In order to maintain sustainable site productivity, new silvicultural practices need to be developed for management of Chinese fir plantations.
Keywords：
Chinese fir; nutrient availability; repeated monoculture; soil biochemistry; soil structure;
- Series：
(D) Agriculture
- Subject：
Forestry
- Classification Code：
S791
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