祁连山西段草地土壤氮矿化及影响因子的关系研究

干旱区地理 ›› 2018, Vol. 41 ›› Issue (1): 92-98.

祁连山西段草地土壤氮矿化及影响因子的关系研究

车宗玺¹, 闫明², 何同弟³, 裴雯¹, 廖空太¹, 马世贵¹, 张建奇¹, 王善举¹, 金敏艳¹, 王明海¹, 王小芳¹

1. 甘肃祁连山国家级自然保护区管理局, 甘肃张掖 734000;
2. 甘州区农业行政综合执法大队, 甘肃张掖 734000;
3. 甘州区环境保护局, 甘肃张掖 734000

收稿日期:2017-10-05 修回日期:2017-12-05 出版日期:2018-01-25
通讯作者: 闫明(1969-),男,大学本科,农艺师.E-mail:931967238@qq.com
作者简介:车宗玺(1980-),男,大学本科,副研究员.E-mail:chezongxi@126.com
基金资助:
国家自然科学基金项目（31260141）；河西学院校长基金项目（XZ2014-21）联合资助

Soil nitrogen mineralization and its influence factors in grassland in western Qilian Mountains

CHE Zong-xi¹, YAN Ming², HE Tong-di³, PEI Wen¹, LIAO Kong-tai¹, MA Shi-gui¹, ZHANG Jian-qi¹, WANG Shan-Ju¹, JIN Min-yan¹, WANG Ming-hai¹, WANG Xiao-fang¹

1. National Nature Reserve Bureau of Qilian Mountains, Zhangye 734000, Gansu, China;
2. Agricultural administrative law enforcement unit of Ganzhouqu, Zhangye 734000, Gansu, China;
3. Environmental Protection Bureau of Ganzhouqu, Zhangye 734000, Gansu, China

Received:2017-10-05 Revised:2017-12-05 Online:2018-01-25

摘要/Abstract

摘要： 以祁连山西段草地土壤氮为研究对象，采用PVC管野外培养法，测定分析土壤氮及其理化指标，计算氮矿化量、矿化速率，分析引起土壤氮矿化的主要环境变量。结果表明：（1）全氮、pH值在海拔上均差异显著（P<0.05），有机质差异不显著（P>0.05）， NH⁺ ₄-N在2 700 m、2 800 m、2 850 m、2 900 m、3 000 m、3 050 m差异显著（P<0.05），其他海拔差异不显著（P>0.05），NO₃^--N在海拔上差异显著（P<0.05）。（2）野外培养能促进土壤氮矿化，矿化速率在海拔上遵循二次多项式。（3）土壤理化指标对土壤氮矿化速率影响大小依次为：pH值 > K > NH₄⁺-N>全氮>水分>温度>容重，土壤氮矿化速率与全氮、K、pH值、NH₄⁺-N、水分之间均有较显著的相关性（P<0.05），与全氮、K、NH₄⁺-N、水分之间有二次多项式显著相关性，与pH值有显著的线型正相关，容重有对数正相关，土温有幂函数正相关，后两者相关性不强。（4）通过研究发现能促进土壤氮矿化各变量因子的赋值范围为：pH值（7.2～8.4）、水分（21.8%～33.27%）、土温（4.41～8.91 ℃）。

关键词: 土壤氮矿化, 影响因子, 关系, 祁连山西段草地

Abstract: In order to explore the characteristics and the main causes of soil nitrogen mineralization in western Qilian Mountains,Gansu Prouince,China,the experiments were conducted in the grassland there utilizing the PVC pipe culture method in the field to measure the soil nitrogen and its associated physical and chemical elements.The nitrogen mineralization amount and the nitrogen mineralization rate were calculated in order to understand the main environmental variables that cause soil nitrogen mineralization.The results showed that,there were significant differences (P<0.05) in total nitrogen and pH value along with the altitude while the difference in organic matter was not significant (P>0.05).There were obvious differences in NH₄⁺-N at various elevations including 2 700 m,2 800 m,2 850 m,2 900 m,3 000 m,and 3 050 m (P<0.05),while no significant difference for NO₃^--N along with the altitude (P<0.05).(The soil nitrogen mineralization was promoted by field culture)The value of mineralization rate was following a quadratic polynomial in altitude.The impacts of physicochemical elements on the rate of soil nitrogen mineralization appeared in the sequence as follows based on descending order of influencing extent:pH value,K,NH₄⁺-N,total nitrogen,the water content,the temperature and soil bulk density.For the soil nitrogen mineralization rate,there were a significant correlation (P<0.05) with total nitrogen,K,pH value,NH₄^--N and water content as a quadratic polynomial correlation,a significant positive linear correlation with the pH value,a logarithm positive correlation with the soil bulk density,and a power function positive correlation with the soil temperature.However the correlation between the soil nitrogen mineralization rate and the latter two was not strong.The study also found that,the value ranges of the variable factors that can promote soil nitrogen mineralization were,pH value from 7.2 to 8.4,water content from 21.8% to 33.27%,and soil temperature from 4.41℃ to 8.91℃.

Key words: soil nitrogen mineralization, influence factors, correlation, grassland in western Qilian Mountains

中图分类号:

S153.6⁺1

车宗玺, 闫明, 何同弟, 裴雯, 廖空太, 马世贵, 张建奇, 王善举, 金敏艳, 王明海, 王小芳. 祁连山西段草地土壤氮矿化及影响因子的关系研究[J]. 干旱区地理, 2018, 41(1): 92-98.

CHE Zong-xi, YAN Ming, HE Tong-di, PEI Wen, LIAO Kong-tai, MA Shi-gui, ZHANG Jian-qi, WANG Shan-Ju, JIN Min-yan, WANG Ming-hai, WANG Xiao-fang. Soil nitrogen mineralization and its influence factors in grassland in western Qilian Mountains[J]. 干旱区地理, 2018, 41(1): 92-98.

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