不同土地利用方式下球囊霉素相关土壤蛋白与有机碳及土壤质地的关系

Relationships Among Glomalin Related Soil Protein ,SOC and Soil Texture under Different Land Use Types

[目的]揭示土地利用方式对球囊霉素相关土壤蛋白(GRSP)的影响。[方法]测定了海南岛5种主要土地利用方式下GRSP、土壤有机碳(Soil oaganic carbon)与土壤质地(Soil texture)在0～10、10～20、20～50cm3个土壤层次中的分布情况。[结果]相对于保持较好的次生林,4种不同耕作土壤的GRSP与有机碳含量均有所下降。GRSP在海南岛5种主要土地利用方式土壤中的含量为0.53～4.80mg/g,占有机碳的7.9%～23.4%,是碳库的重要组成部分。GRSP占有机碳的比例在不同土地利用方式下差异显著,在土层之间差异不显著,GRSP和有机碳含量在土壤剖面上垂直分布较明显。GRSP与有机碳、砂粒含量呈显著正相关,与粉粒和粘粒呈显著负相关。[结论]砂粒含量在很大程度上决定了GRSP的含量,壤土相对粘土更有利于GRSP的累积。

[Objective]The aim was to indicate the effects on glomalin under different land use types. [Method] GRSP,soil organic carbon content and soil texture in 3 depths（0-10 cm,10-20 cm,20-50 cm） of 5 main kinds of selected land use type were examined in Hainan. [Result]The results showed that GRSP and SOC content of four artificial land use types decreased compared with the natural secondary forest land,the GRSP content of all samples ranges from 0.53-4.80 mg/g,accounting for 7.9%-23.4% of the SOC,which means GRSP was one important component of SOC pool in soil. The ratio of GRSP to SOC was significantly different among land use types but the depths. GRSP and SOC exhibited obvious vertical distribution pattern. GRSP was significantly positive related to SOC and sand content but negative related to silt and clay content. [Conclusion] The sand content determineed the GRSP content significantly and loam was better matrix for GRSP accumulation than clay.