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| 祁连山疏勒河源区冻土退化对土壤微生物生物量碳氮的影响 | |
| 引用本文： | 吴明辉,瞿德业,李婷,刘放,高雅月,陈生云,陈拓.祁连山疏勒河源区冻土退化对土壤微生物生物量碳氮的影响[J].地理科学,2021,41(1):177-186. |
| 作者姓名： | 吴明辉 瞿德业 李婷 刘放 高雅月 陈生云 陈拓 |
| 作者单位： | 1.中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室疏勒河源冰冻圈与生态环境综合监测研究站，甘肃 兰州 730000 2.青海师范大学高原科学与可持续发展研究院/地理科学学院，青海 西宁 810008 3.中国科学院大学，北京 100049 4.西北师范大学地理与环境科学学院，甘肃 兰州 730600 5.云南大学生态学与环境学院，云南 昆明 650000 6.祁连山国家公园国家长期科研基地，青海 西宁 810000 |
| 基金项目： | 国家重点研发计划课题(2019YFC0507404);国家自然科学基金(41871064);青海省重点研发与转化计划项目(2020-SF-146);青海省“高端创新人才千人计划”高层次人才项目资助 |
| 摘 要： | 对青藏高原东北缘祁连山西段疏勒河源区多年冻土区0~50 cm土壤微生物生物量碳氮分布特征及其影响因素进行分析。结果表明:稳定型和极不稳定型多年冻土区0~50 cm土壤中微生物量碳含量范围分别为0.015~0.620 g/kg和0.019~0.411 g/kg，微生物量氮含量范围分别为0.644~12.770 mg/kg和0.207~3.725 mg/kg；土壤微生物量总体呈现出稳定型显著高于极不稳定型多年冻土，表明多年冻土退化（多年冻土由稳定型退化为极不稳定型）对土壤微生物量积累有明显抑制作用。土壤微生物生物量碳占有机碳、微生物生物量氮占全氮的比值在稳定型多年冻土中显著高于极不稳定型，表明多年冻土退化对土壤微生物的矿化能力有明显抑制作用。土壤微生物量及其与土壤养分的比值有显著的剖面变化特征，随土壤深度增加而减小。土壤微生物量碳氮均与土壤温度显著负相关，与地下生物量显著正相关。稳定型多年冻土中，土壤微生物量碳氮与碳氮比正相关、与氧化还原电位负相关；不稳定型多年冻土中，土壤微生物量碳氮与pH正相关。土壤微生物量碳氮与土壤温度和pH在剖面变化上显著相关。逐步回归分析表明驱动微生物生物量碳氮在不同多年冻土类型和土层之间变化的因子是不同的。 |
| 关 键 词： | 土壤微生物量碳 土壤微生物量氮 多年冻土退化 疏勒河源区 |
| 收稿时间： | 2020-06-19 |
| 修稿时间： | 2020-12-11 |
Effects of Permafrost Degradation on Soil Microbial Biomass Carbon and Nitrogen in the Shule River Headwaters,the Qilian Mountains |
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| Wu Minghui,Qu Deye,Li Ting,Liu Fang,Gao Yayue,Chen Shengyun,Chen Tuo.Effects of Permafrost Degradation on Soil Microbial Biomass Carbon and Nitrogen in the Shule River Headwaters,the Qilian Mountains[J].Scientia Geographica Sinica,2021,41(1):177-186. | |
| Authors: | Wu Minghui Qu Deye Li Ting Liu Fang Gao Yayue Chen Shengyun Chen Tuo |
| Abstract: | Soil microbial biomass, as an important index of soil active nutrients, is sensitive to microbial activity, environmental factors and climate change. Thus frozen ground degradation may exhibit striking influences on it. However, up to now, the related research is lacking in the Qinghai-Tibet Plateau (QTP). For this, two ecological plots containing the stable permafrost (SP) and extremely unstable permafrost (EUP) were selected, and investigated the quantity and distribution of soil microbial biomass carbon (SMBC) and nitrogen (SMBN) at depth of 0-50 cm, and further analyzed how soil physicochemical factors affect them in the Shule River headwaters, the Qilian Mountains, northeastern of the QTP. Here, our study was conducted upon an existing way that different permafrost types could shift to the temporal series that displayed different stages of permafrost degradation, which has been defined as a spatial-temporal shifts method. Results showed that the range of SMBC was 0.015-0.620 g/kg and 0.019-0.411 g/kg, and that of SMBN was 0.644-12.770 mg/kg and 0.207-3.725 mg/kg, respectively in the SP and EUP. Soil microbial biomass of the SP at depth of 0-50 cm was significantly higher than that of the EUP, indicating that the permafrost degradation had a distinct inhibition on the accumulation of soil microbial biomass. Moreover, ratios of soil microbial biomass to soil nutrients in the SP were significantly higher than that in the EUP, suggesting that the permafrost degradation could also inhibit the mineralization of soil microorganisms. Soil microbial biomass and its ratio to soil nutrients had obviously profile distribution, which decreased with the profile depth increase. Furthermore, permafrost types mainly controlled correlations between SMBC, SMBN and soil physicochemical factors, belowground biomass. Both SMBC and SMBN were negatively correlated with soil temperature and positively correlated with belowground biomass. In addition, in the SP, SMBC and SMBN were positively correlated with the ratio of carbon to nitrogen and negatively correlated with redox potential; in the EUP, SMBC and SMBN are positively correlated with soil pH. In the profile, SMBC and SMBN were significantly correlated with soil temperature and pH. The stepwise regression analysis showed that factors driving microbial biomass carbon and nitrogen were different in different types of frozen ground and profile. In conclusion, the study of characteristics about soil microbial biomass carbon and nitrogen in this region provides scientific support for assessing soil quality, health and predicting global carbon and nitrogen cycles under frozen ground degradation. |
| Keywords: | soil microbial biomass carbon soil microbial biomass nitrogen permafrost degradation the Shule River headwaters |
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