封育年限对伊犁绢蒿荒漠土壤有机氮组分的影响

发布时间：2018-03-24 22:33

本文选题：封育年限　切入点：伊犁绢蒿荒漠　出处：《草业科学》2017年09期

【摘要】：为探究荒漠土壤有机氮组分对封育年限的响应规律,研究了不同封育年限(封育时间为0、1、4和11a)对中度退化伊犁绢蒿(Seriphidium transiliense)荒漠草地土壤全氮(total nitrogen,TN)、轻组氮(light fraction organic nitrogen,LFON)、颗粒氮(particulate organic nitrogen,PON)、微生物量氮(soil microbial biomass nitrogen,SMBN)及其分配比例的影响。结果表明,与封育0a相比,其它封育年限5-10、10-20、30-50cm土层的TN含量均显著降低(P0.05),且0-50cm土层TN含量随封育年限延长呈"降-升"趋势;封育11a,0-5cm土层PON含量达到最高,而封育4a,5-10和20-30cm土层PON分配比例显著增加;0-20cm土层LFON含量增加显著,且0-5cm土层含量最高。0-50cm土层SMBN随封育年限增加呈"降-升"趋势,而封育4a,5-10和20-30cm土层SMBN分配比例显著高于封育0a和封育1a(P0.05);0-10cm土层LFON和0-50cm土层LFONR与封育年限呈显著正相关。总之,短期封育(1~11a)下,中度退化伊犁绢蒿荒漠土壤全氮含量仍未得到恢复,但促进了LFON、PON、SMBN及其分配比例的增加。
[Abstract]:In order to investigate the response of organic nitrogen components to the years of fencing in desert soil, The effects of different fencing years (fencing time 0 ~ 1 ~ 1 ~ 4 and 11 a) on total N ~ (3 +) total N ~ + n ~ (10), fraction fraction organic nitrogenn N ~ (1), granular organic nitrogenPON, microbial biomass soil microbial biomass nitrogenn (SMBN) and their partitioning ratios in the desert grassland were studied. Compared with the period of fencing for 0 years, the TN content in the soil layer of 5-10 ~ (-10) ~ (-20) ~ (-50) ~ (-50) cm was significantly lower than that in the rest of a year, and the TN content of 0-50cm soil layer showed a "down-ascending" trend with the extension of the period of fencing, and the PON content of the soil layer of 11a ~ (10) ~ (-5) cm was the highest. However, the distribution ratio of PON in the soil layer of 4a ~ (5 ~ 10) and 20-30cm was significantly increased. The content of LFON in 0-20 cm soil layer increased significantly, and the content of SMBN in the soil layer of 0 ~ 50 cm soil layer was the highest in the soil layer of 0 ~ 50 cm, and the ratio of SMBN increased with the increase of the period of closure. However, there was a significant positive correlation between the distribution of SMBN in the soil layer of 4a, 5-10 and 20-30cm, and that of LFON and 0-50cm in the soil layer of 0-10cm and 0-10cm, respectively. In a word, the total nitrogen content of the moderately degraded desert soil of Artemisia Yili was not recovered under short-term fencing. But it promoted the increase of SMBN and its distribution ratio.
【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——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(31260574)
【分类号】：S812.2

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