N fertilization affects on soil respiration, microbial biomass and root respiration in Larix gmelinii and Fraxinus mandshurica plantations in China
N fertilization affects on soil respiration, microbial biomass and root respiration in Larix gmelinii and Fraxinus mandshurica plantations in China
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施氮对中国落叶松和水曲柳人工林土壤呼吸、微生物量和根系呼吸的影响
DOI：
10.1007/s11104-010-0348-8
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发表时间：
2010-08-01
期刊：
影响因子：
4.9
通讯作者：
Liang, Aizhen
中科院分区：
文献类型：
--
作者：
Jia, Shuxia;Wang, Zhengquan;Liang, Aizhen
研究了落叶松和水曲柳人工林地下生物过程对土壤氮素有效性的响应。分别使用 Li-Cor 6400 和气相 O2 电极测量土壤和根系呼吸。与对照相比，施氮肥导致落叶松和白蜡人工林细根生物量分别减少52%和25%，土壤呼吸分别减少30%和24%。落叶松林下土壤微生物平均生物量C和N分别下降29%和42%，白蜡林分别下降39%和47%。施肥地块细根组织氮浓度分别比对照地块高26%和12%，而施肥地块落叶松和白蜡林的平均细根呼吸速率分别增加10%和13%。土壤呼吸速率与土壤温度和季节动态呈显着正指数关系。这些研究结果表明，施氮肥可以抑制五个分支目（直径 <2 毫米）的细根生物量、土壤呼吸和土壤微生物生物量碳和氮，并改变 L. gmelinii 和 F. mandshurica 种植园的土壤微生物群落。
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 Li-Cor 6400 and gas-phase 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 plantations.