杉木檫树根际土壤有机化合物研究

本文分析了杉木、檫树根际土壤的几种有机化合物数量。结果表明：无论是杉木还是檫树其根际土壤各类有机物总量都不同程度高于相应全土；杉木根际土壤的Ｃ／Ｎ比檫树根际土壤平均高出１．６８，Ｈ／Ｆ低０．２３，总糖，可溶性还原糖和有机酸含量杉木根际土较高，而总氨基酸和游离氨基酸檫树根际土高；土壤总酚量在两种根际土间无明显差异，而游离酚量杉木根际高于檫树根际；杉木连栽造成土壤有机质、全氮和Ｈ／Ｆ的降低和总酚量、游

studies on Organic Compounds in Rhizosphere soil of Chinese fir and Chinese Sassarras

The total amount of various organic compounds in the rhizosphere soil is higher than that in the bulk soil,whether in Chinese fir or Chinese sassafras.The value of C/N(of H/F) in the rhizosphere soil of Chinese fir is higher by 1.68(lower by 0.23 ) than that in the rhizosphere soil of chinese sessafras.The amount of total carbohydrate,soluble reducing carbo-hydrate and organic acid in the rhizosphere soil of Chinese fir is greater than that in the rhizosphere soil of Chinese sassafras , but it is a different case with amino acid and free amino acid. There is no remarkable difference of total phenol between rhizosphere soil of Chinese fir and that of Chinese sassafras,except that the rhizosphere soil of Chinese fir has a greater amount of free phenol.In bulk soil,Chinese fir succession can result in a decline in total organic compounds,total N and H/F,but an increase in total phenol and free phenol.Except an increase of free phenol in the rhizosphere soil of the second planting Chinese fir, the difference of other compounds is not striking in the rhizophere soil of first and second planting Chinese fir.