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[1]WANG Dong,WANG Yanping,CHEN Xinli,et al.Seasonal Dynamics of Soil Physical and Chemical Properties after Thinning for 7 Years in Chinese Fir Plantation[J].Research of Soil and Water Conservation,2015,22(02):69-73,78.

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Seasonal Dynamics of Soil Physical and Chemical Properties after Thinning for 7 Years in Chinese Fir Plantation

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 02 Page number: 69-73,78 Column: Public date: 2015-04-28

Title:: Seasonal Dynamics of Soil Physical and Chemical Properties after Thinning for 7 Years in Chinese Fir Plantation

Author(s):: WANG Dong, WANG Yanping, CHEN Xinli, GUAN Qingwei; School of Forestry Resources and Environment, Nanjing Forestry University, Nanjing 210037, China

Keywords:: physical and chemical properties of soil; seasonal difference; thinning intensity; Chinese fir plantation

CLC:: S753

DOI:: -

Abstract:: Seasonal dynamics of soil temperature, soil water content, soil total C, soil total N, soil total P, C/N and N/P at 0—20 cm soil depth among four thinning intensities (CK:0%, LIT:30%, MIT: 50%, HIT: 70%) of Chinese fir (25 years) plantation in Nanjing Lishui Forest Farm were examined. Results showed that the effect of thinning on soil physical and chemical properties varied among seasons. In spring, thinning had no significantly effect on soil temperature, soil water content and soil total C. Compared with control treatment, MIT and HIT significantly decreased soil total N by 22% and 11%, respectively, and MIT also significantly decreased soil total P by 26%. In summer, no any significant difference was observed for soil temperature, soil total N,soil total P and soil N/P between thinned and control treatments, while all thinned intensities significantly increased soil water content, with an average of 22%, and both MIT and HIT significantly decreased soil total C and soil C/N. In autumn, all studied indexes of soil significantly changed under thinning. Soil temperature, soil water content, soil N/P in all thinned plots were significantly higher than those of control plot, but the changes of soil total P was opposite. In winter, the effect of thinning on soil was not so obvious, except that MIT significantly decreased soil temperature, and MIT and HIT significantly increased soil C/N and soil total P, respectively, no other significantly differences were observed between thinned and control plots. These results showed that it was important to take seasonal differences into consideration in evaluating the effect of thinning on soil physical and chemical properties. After seven years of thinning, soil total N and total P in thinned plots were lower than those of control plot in some degree. Therefore, in order to increase soil nutrient resources in thinned plots, we suggested that nitrogen fertilizer should be applied in LIT plot in the spring, phosphorus fertilizer was highly needed in all thinned plots in the autumn, and both nitrogen and phosphorus fertilizers should be applied in MIT in the spring. From the perspective of annual soil total N and total P, HIT was the best thinning intensity to maintain the soil N and P among three treatments, and then it was followed by LIT.

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