禁牧年限对退化伊犁绢蒿荒漠土壤有机碳库和微生物碳、氮的影响

发布时间：2018-07-10 20:15

本文选题：围栏封育 + 土壤碳库　；参考：《新疆农业科学》2017年05期

【摘要】：【目的】明确伊犁绢蒿(Seriphidium transiliense)荒漠土壤有机碳库和微生物量碳氮对禁牧年限的响应规律,为退化荒漠的恢复、管理和利用提供科学依据。【方法】采用空间序列代替时间序列的方法,以中度退化伊犁绢蒿荒漠为对象,研究不同禁牧年限(禁牧1、4和11 a)下荒漠有机碳库(SOC)、微生物量碳(MBC)和微生物量氮库(MBN)的变化特征。【结果】(1)与自由放牧区相比,禁牧区0~30 cm土壤有机碳储量显著下降了13.3%~24.3%,0~10 cm有机碳储量随着禁牧年限的增加呈先下降后上升的变化趋势。(2)随着禁牧年限的增加,0~30 cm土壤微生物量碳储量呈先降后升的变化趋势,而土壤微生物量氮对禁牧的响应不明显(P0.05),微生物量碳可以作为衡量退化荒漠恢复的早期指标。【结论】短期禁牧不利于退化伊犁绢蒿荒漠土壤的恢复,而长期禁牧能有效提高土壤质量。禁牧是恢复退化荒漠最经济、最方便的途径。
[Abstract]:[objective] to study the response of soil organic carbon pool and microbial biomass carbon and nitrogen in desert soil of Seriphidium transiliense to the years of forbidding grazing, which is the restoration of degraded desert. Management and utilization to provide scientific basis. [methods] the method of replacing time series with space sequence was used to study the moderately degraded desert of Artemisia Ilii. The characteristics of SOC, MBC and MBN in desert organic carbon pool (SOC), microbial biomass carbon (MBC) and microbial biomass nitrogen pool (MBN) were studied under different grazing ban years (1 ~ 4 and 11 a). [results] (1) compared with free grazing area, the changes of SOC, MBC and MBN were studied. The soil organic carbon storage of 0 ~ 30 cm soil decreased significantly in the forbidding pastoral area, and the soil organic carbon storage decreased firstly and then increased with the increase of the forbidden grazing years. (2) the soil microbial biomass carbon storage decreased first and then increased with the increase of the forbidden grazing years. But the response of soil microbial biomass nitrogen to forbidding grazing was not obvious (P0.05), microbial biomass carbon could be used as an early index to measure the restoration of degraded desert. [conclusion] Short-term forbidding grazing was not conducive to the restoration of degraded desert soil. And long-term grazing ban can effectively improve soil quality. Forbidding grazing is the most economical and convenient way to restore degraded desert.
【作者单位】：新疆农业大学草业与环境科学学院/新疆草地资源与生态自治区重点实验室;
【基金】：国家自然科学基金项目“不同退化蒿类荒漠土壤有机碳组及其碳氮特征对禁牧的响应”(31160477);国家自然科学基金项目“基于高光谱遥感的退化伊犁绢蒿荒漠草地围栏恢复特征的研究”(31360571)~~
【分类号】：S153.6;S154.3

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