The pH change in rhizosphere ofPinus koraiensis seedlings as affected by different nitrogen sources and its effect on phosphorus availability |
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| Authors: | Chen Yong-liang Han Shi-jie Zou Chun-jing Zhou Yu-mei Yu Xia |
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| Institution: | (1) Northeast Forestry University, 150040 Harbin, P.R. China;(2) Institute of Applied Ecology, Chinese Academy of Sciences, 110016 Shenyang, P.R. China;(3) Dandong Research institute of Forestry, 118011 Dandong City Liaoning Province, P.R. China |
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| Abstract: | Root mat method described by Kuchenbuch and Jungk was used to study the rhizosphere processes. The experiment was carried
out on two years oldPinus koraiensis seedlings. Soil samples collected from the upper 20-cm soil layer in Changbai Mountain were treated with three different
forms of nitrogen fertilizers: NO3
−−N, NH4
+−N and NH4NO3. The results showed that the soil pH and available P near the roots were all lower than in the bulk soil in control treatment.
NH4
+−N application greatly decreased the soil pH near the roots compared to the control treatment and promoted the absorption
of phosphorus, which led to a more remarkable depletion region of available P. On the contrary, the rhizosphere soil pH was
higher than in the bulk soil in treatments with NO3
−−N and retarded the P absorption, which led to a nearly equal available P contents to the bulk soil. In treatment with NH4NO3, the rhizosphere soil pH was only a little lower than that in the control treatment and its effects on P absorption is mediate
between the treatments with NH4
+−N and NO3
−−N.
Foundation item: This paper was supported by National Natural Science Foundation of China (Grant No. 30170167).
Biography: Chen Yong-liang (1969-), male, Ph. Doctor, lecture of Northeast Forestry University, Harbin 150040, Post-doctor in Institute
of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, P.R. China. E-mail: ylchin@sohu.com
Responsible editor: Seng Funan |
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| Keywords: | Nitrogen sources Rhizosphere pH Available P |
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