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Title of Journal: Plant Soil

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Abbravation: Plant and Soil

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Springer Netherlands

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DOI

10.1016/0006-8993(84)90030-1

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1573-5036

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N fertilization affects on soil respiration micro

Authors: Shuxia Jia Zhengquan Wang Xingpeng Li Yue Sun Xiaoping Zhang Aizhen Liang
Publish Date: 2010/03/24
Volume: 333, Issue: 1-2, Pages: 325-336
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Abstract

The response of belowground biological processes to soil N availability in Larix gmelinii larch and Fraxinus mandshurica ash plantations was studied Soil and root respiration were measured with LiCor 6400 and gasphase O2 electrodes respectively Compared with the control N fertilization induced the decreases of fine root biomass by 52 and 25 and soil respiration by 30 and 24 in larch and ash plantations respectively The average soil microbial biomass C and N were decreased by 29 and 42 under larch stand and 39 and 47 under ash stand respectively While the fine root tissue N concentration under fertilized plots was higher 26 and 12 than that under control plots respectively the average fine root respiration rates were increased by 10 and 13 in larch and ash stands under fertilized plot respectively Soil respiration rates showed significantly positive exponential relationships with soil temperature and a seasonal dynamic These findings suggest that N fertilization can suppress fine root biomass at five branch orders 2 mm in diameter soil respiration and soil microbial biomass C and N and alter soil microbial communities in L gmelinii and F mandshurica plantationsThe authors thank Gu Jiacun Hailong Sun Changfu Huo Xiankui Quan Sen Song Wei Shi Li Chen Zhao Yanli and Yang Xu for their help with the field and laboratory work and anonymous reviewers for valuable comments This research was supported by the projects from the Natural Science Foundation of China 30130160 and 40801071 Doctoral Research Foundation O8H2041 in Northeast Institute of Geography and Agroecology Chinese Academy of Sciences

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