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[1]王兴灵 薛 丹 陈 槐** 刘建亮 詹 伟 胡 骥 张金波 Christoph Müller.牦牛排泄物输入对若尔盖高寒泥炭地土壤短期氮转化的潜在影响*[J].应用与环境生物学报,2018,24(06):1-14.[doi:10.19675/j.cnki.1006-687x.2018.04004]
 WANG Xingling & XUE Dan,CHEN Huai**,LIU Jianliang,et al.Potential short-term effects of yak excreta addition on peat soil gross nitrogen transformations from Zoige peatland under laboratory conditions *[J].Chinese Journal of Applied & Environmental Biology,2018,24(06):1-14.[doi:10.19675/j.cnki.1006-687x.2018.04004]
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牦牛排泄物输入对若尔盖高寒泥炭地土壤短期氮转化的潜在影响*()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
24卷
期数:
2018年06期
页码:
1-14
栏目:
研究论文
出版日期:
2018-12-25

文章信息/Info

Title:
Potential short-term effects of yak excreta addition on peat soil gross nitrogen transformations from Zoige peatland under laboratory conditions *
文章编号:
201804004
作者:
王兴灵123 薛 丹12 陈 槐12** 刘建亮12 詹 伟12 胡 骥12 张金波4 Christoph Müller 5
1中国科学院成都生物研究所山地生态恢复与生物资源利用重点实验室 成都 610041?
2中国科学院全球变化研究若尔盖生态站 红原 624400?
3中国科学院大学 北京 100049?
4南京师范大学地理科学学院 南京 210023?
5吉森大学植物生态学系 德国 35392
Author(s):
WANG Xingling123 & XUE Dan 12 CHEN Huai12** LIU Jianliang12 ZHAN Wei12 HU Ji12 ZHANG Jinbo3 & Christoph Müller 4
1 Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China2 Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan 624400, China3University of Chinese Academy of Sciences, Beijing 100049, China4School of Geography Science, Nanjing Normal University, Nanjing 210023, China5Department of Plant Ecology, Justus-Liebig University Giessen, Giessen 35392, Germany
关键词:
总氮转化率MCMC数值优化模型牦牛排泄物若尔盖泥炭地
Keywords:
gross nitrogen transformations MCMC numerical model yak excreta Zoige peatland
DOI:
10.19675/j.cnki.1006-687x.2018.04004
摘要:
牦牛放牧是若尔盖泥炭地一个普遍现象,牦牛排泄物直接返还于泥炭地。目前有关牦牛排泄物输入对泥炭地土壤氮转化的研究有限。通过室内短期培养实验,利用15N稳定同位素成对标记法结合MCMC数值模型,研究了牦牛排泄物输入对土壤氮初级转化速率的影响。结果表明:施粪组土壤NH4+-N的总生产速率(17.49 mg kg-1 d-1)约为对照组的2倍(8.94 mg kg-1 d-1),其中有机氮的矿化作用是其主要来源途径。两种处理土壤NH4+-N的总消耗速率均大于各自总生产速率,其中被微生物的同化作用固定于难分解有机氮库中的NH4+-N分别占其总消耗量的70%(对照组)和91%(施粪组)。微生物的自养硝化作用是两种处理土壤NO3--N的主要产生途径,均占各自NO3--N总生产量的80%以上。对照组和施粪组土壤NO3--N的主要利用方式均为NO3--N的异化还原作用,分别为0.20和0.24 mg kg-1 d-1。施粪组土壤N2O累积排放量最高,为7.81 mg kg-1,对照组次之,为6.08 mg kg-1,施尿组最少,为3.04 mg kg-1。施粪和施尿使土壤CH4累积排放量分别增加了2.08和9.49 mg kg-1。施粪组和施尿组土壤CO2累计排放量分别为对照组(145.17 mg kg-1)的3.89倍和22.63倍。总体来说,牦牛粪便输入通过促进土壤有机氮的矿化作用、抑制微生物的自养硝化作用以及促进NO3--N的异化还原作用,提高了土壤的供氮能力和减少了NO3--N的淋溶风险。(图4表2参71)
Abstract:
Yak graze extensively on the alpine Zoige peatland in the eastern Qinghai-Tibetan Plateau, and large amounts of excrements are directly deposited onto alpine peatland. However, information on peat soil gross nitrogen transformations after yak excreta return is limited. In this study, we investigated the potential short-term effects of yak excrements on peat soil gross nitrogen transformation by a 15N tracing study under laboratory conditions. Results showed that the total NH4+-N production was about twice higher in the dung-affected soil (17.49 mg kg-1 d-1) than in the CK treatments (8.94 mg kg-1 d-1), and the mineralization of organic nitrogen are the main source in both treatments, with about 57% of total nitrogen mineralization came from the recalcitrant organic matter in the dung-affected soil while amounted to 63% from the mineralization of soil labile organic matter in CK. The total consumption of NH4+-N was higher than that of production in both soils, leading to net NH4+-N consumption in the soils. About 70% and 91% of the total NH4+-N consumption in the CK and dung-affected soils were both used for microbial immobilization to recalcitrant organic nitrogen pool. Autotrophic nitrification was the major NO3--N formation mechanism in both soils, which were 5.31 mg kg-1 d-1 and 2.13 mg kg-1 d-1 in the CK and dung–affected soil, respectively. Meanwhile, dissimilatory nitrate reduction in the dung-affected soils are slightly higher than that in the CK treatment, indicating that yak dung addition could reduce potential NO 3--N leaching risks. the largest cumulative N2O emissions over the 19 incubation period is in the dung-affected soil, which was 7.81 mg kg-1, while the lowest values appears in the urine-affected soil (3.04 mg kg-1,). Yak dung and urine addition both significantly (P < 0.01) increased soil CH4 and CO 2 emissions . In conclusion, our findings suggested that yak dung may increase soil nitrogen supply capacity and decrease potential nitrate leaching risks by increasing gross NH 4+-N mineralization, inhibiting autotrophic nitrification and promoting dissimilatory nitrate reduction to ammonium. Yak dung slightly increased soil N 2O emissions while yak urine addition significantly decreased soil N2O emission. In addition, yak dung and urine addition both increased largely soil CO2 and CH4 emissions.

备注/Memo

备注/Memo:
收稿日期: 2018-04-04 接受日期: 2018-05-08
*中国科学院前沿科学重点研究项目(QYZDB-SSW-DQC007)和国家自然科学基金面上项目(31570480)资助?
**通讯作者(E-mail:chenhuai@cib.ac.cn)
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更新日期/Last Update: 2018-06-05