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围封对内蒙古荒漠草原土壤理化性质及稳定碳氮同位素的影响
朱国栋, 郭 娜, 吕广一, 王成杰
内蒙古农业大学草原与资源环境学院
摘要:
以内蒙古中西部希拉穆仁荒漠草原为研究对象,比较分析了退化荒漠草原自由放牧、围封3 a和围封5 a土壤理化性质及稳定性碳氮同位素的差异。结果表明:①与自由放牧相比,围封显著增加了土壤有机碳含量、全碳含量、土壤含水量及土壤碳氮比(C/N)(P<0.05),土壤容重和全氮含量则显著降低(P<0.05),但土壤全氮含量有随围封年限增加而升高的趋势。②相比自由放牧,围封显著降低了土壤的δ13C值和δ15N值。③土壤有机碳含量与δ13C值呈显著负相关关系(P<0.05),而土壤全氮含量与δ15N值呈极显著正相关关系(P<0.01)。可见,围封有利于促进退化荒漠草原土壤有机碳的积累,减缓土壤氮循环,改善土壤性质。
关键词:  荒漠草原  围封  土壤理化性质  稳定碳氮同位素
DOI:10.13758/j.cnki.tr.2020.04.026
分类号:S812.2
基金项目:国家重点研发计划项目(2016YFC0500504)、国家自然科学基金项目(31460125)和内蒙古自治区应对气候变化及低碳发展专项资金项目(2016-615)资助。
Effects of Enclosure on Soil Physiochemical Properties and Stable Carbon and Nitrogen Isotopes in Inner Mongolia Desert Steppe
ZHU Guodong, GUO Na, LÜ Guangyi, WANG Chengjie
College of Grassland, Resources and Environment, Inner Mongolia Agricultural University
Abstract:
Soil physiochemical properties and stable carbon and nitrogen isotopes of grazing and fencing for 3 and 5 years were analyzed in the Xilamuren degraded desert steppe of the central-western Inner Mongolia. The results showed that: 1) Fencing increased the contents of soil organic carbon, total carbon and soil moisture and soil carbon-nitrogen ratio (C/N)(P<0.05) compared to free grazing. Soil bulk density and total nitrogen content were reduced(P<0.05), while the total nitrogen content of soil tended to increase with fencing years. 2) The values of δ13C and δ15N of enclosing treatments decreased with fencing years(P<0.05). 3) Soil organic carbon content was negatively significantly correlated with its δ13C value (P<0.05), while the total nitrogen content was positively significantly correlated with its δ15N value(P<0.01). In general, enclosure is beneficial to promote soil organic carbon accumulation, retard soil nitrogen cycle, and improve soil properties in degraded desert steppe.
Key words:  Desert steppe  Enclosing  Soil physical and chemical properties  Stable carbon and nitrogen isotope

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