火烧频率对草原土壤养分及球囊霉素相关土壤蛋白含量的影响

目的]分析不同火烧频率下草原土壤养分与球囊霉素相关土壤蛋白(GRSP)的动态变化及相互关系,揭示不同火烧处理下土壤养分及GRSP的变化规律,为合理利用火烧措施改良草原植被和土壤质量提供理论依据。方法]以锡林郭勒草原不同火烧频率的羊草草原为研究对象,测定土壤有机碳、全氮、全磷及GRSP含量。结果]表层土壤(0~5 cm)有机碳含量随火烧频率增加呈降低趋势。低频火烧(每4 a火烧1次)可使10~40 cm土壤有机碳含量显著增加(P0.05),高频火烧(每2 a火烧1次)则使0~40 cm土层有机碳含量显著降低(P0.05)。而火烧处理对0~40 cm土壤全氮、全磷无显著影响(P0.05)。低频火烧既可以提高表层(0~5 cm)土壤EE-GRSP产生量(P0.05),又显著增加0~40 cm土层T-GRSP的积累量(P0.05),同时GRSP、有机碳、全氮相互之间呈极显著相关性(P0.01)。结论]采用每4 a进行1次火烧的低频火烧,有利于深层土壤碳库的积累,同时提高GRSP的产生量和积累量,能够充分发挥改善退化草原土壤的作用。

Impact of Burning Frequency on Soil Nutrients and Glomalin Related Soil Protein in Grassland

Objective] The study aims to reveal varying patterns of soil nutrients and glomalin related soil protein (GRSP) in different burning treatments by analyzing associations between soil nutrients and GRSP in grassland with different burning frequencies .This study will provide theo-retical basis for improving grassland vegetation and soil quality with using reasonable burning measure . Method ] Chinese wildrye grassland of different burning frequencies in Xilingol was selected as object.We determined some soil parameters,including soil organic carbon (SOC),total nitrogen (N),total phosphorus (P) and GRSP content.Result] For SOC of 0-5 cm,there was a decreased trend with increasing burning fre-quencies.Lower burning frequency (every 4 years) could significantly increase SOC in 0-40 cm layer (P<0.05),while higher burning frequen-cy (every 2 years) could markedly decrease SOC in the same layer (P<0.05).Soil P and N were not affected by different burning treatments in 0-40 cm (P>0.05).Lower burning frequency (every 4 years) could increase EE -GRSP content in soil surface (0-5 cm) and T-GRSP content in 0-40 cm (P<0.05).Meanwhile,highly significant correlations among SOC,N and GRSP were observed(P<0.01).Conclusion] Lower burning frequency could improve SOC sequestration in deeper soil layer and increase GRSP output and input ,which was mainly responsible for improving degraded grassland soil quality .