Changes in soil P chemistry as affected by conversion of natural secondary forests to larch plantations |
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| Authors: | Kai Yang Jiao-Jun Zhu Qiao-Ling Yan Osbert Jianxin Sun |
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| Institution: | 1. Qingyuan Experimental Station of Forest Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China;3. MOE Key Laboratory for Silviculture and Conservation, Institute of Forestry and Climate Change Research, Beijing Forestry University, Beijing 100083, China |
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| Abstract: | To assess the impact of conversion of native forests to monocultural larch plantations on soil chemical properties, we compared the total and various fractions of soil phosphorus (P) and acid phosphatase activity (APA) between natural secondary forests (NSF) and Larix olgensis plantations (LOP) on a montane forest site in eastern Liaoning Province, Northeast China. We found that the concentrations of total P (TP), inorganic P, and iron-bound P (Fe-P) were significantly higher, and the concentrations of microbial biomass P (MBP), sodium bicarbonate-extractable organic P (NaHCO3-Po), and APA were significantly lower, in the LOP stands than in the NSF stands; whilst organic P, sodium bicarbonate-extractable inorganic P (NaHCO3-Pi), aluminum-bound P (Al-P) and calcium-bound P (Ca-P) were comparable between the two forest types. Our study also showed that the ratios of MBP/TP, NaHCO3-Pi/TP, NaHCO3-Po/TP, and APA significantly varied with time during the growing season. Moreover, the concentrations of NaHCO3-Pi, NaHCO3-Po, and MBP had significant (P < 0.01) and positive linear relationships with APA. Overall, results from this study suggest that conversion of native forests to larch plantations in the region is more likely to cause compositional change in soil P than to result in reduction in overall P availability. |
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| Keywords: | Acid phosphatase activity Larch plantation Microbial biomass Natural secondary forest Northeast China Soil P chemistry |
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