腐殖酸对矿物结合汞活性的影响研究: Ⅲ.对酸性淋溶条件下矿物结合汞的淋洗与迁移的影响

Made teas and typical tea-grown soils in sichuan and chongqing were collected to investigate soil nutrients,related soil properties and tea quality.The tea-grown soils in Sichuan and Chongqing are distributed mainly in mountainous areas.The high annual precipitation(over 1100mm),precipitous soil plopes,low cohesion among soil particles and high soil porosity suggested that intensive erosion and leaching might occur in these soils,Morever,they were very acidic and poor in mineral nutrients such as N,P,K,Ca and Mg except S.The average content of total S was 20.40g kg^-1,much higher than that of organic matter in these soils,revealing that S in the tea-grown soils existed mainly in inorganic forms and very little in organic forms.Water-extractable S accounted for only a small amount of total S, which showed that ost parts of sulfur in these soils were insoluble in water,K and S varied greatly in made teas,The concentrations of N and P,however,varied little in these teas even though they differentiated significantly in the tea-grown soils.The high concentration of nitrogen in made teas could result in the high free amino acids and low polyphenol of teas,Significantly positive correlation was established between potassium and polyphenol in made teas.Teas with high ratio of phenol to free amino acids were usually good taste and appearance.

Tea-Grown Soils and Tea Quality in Sichuan and Chongqing, China

Made teas and typical tea-grown soils in Sichuan and Chongqing were collected to investigate soil nutri-ents, related soil properties and tea quality. The tea-grown soils in Sichuan and Chongqing are distributed mainly in mountainous areas. The high annual precipitation (over 1 100 mm), precipitous soil slopes, low cohesion among soil particles and high soil porosity suggested that intensive erosion and leaching might occur in these soils. Moreover, they were very acidic and poor in mineral nutrients such as N, P, K, Ca and Mgexcept S. The average content of total S was 20.40 g kg-1, much higher than that of organic matter in thesesoils, revealing that S in the tea-grown soils existed mainly in inorganic forms and very little in organic forms.Water-extractable S accounted for only a small amount of total S, which showed that most parts of sulfur in these soils were insoluble in water. K and S varied greatly in made teas. The concentrations of N and P,however, varied little in these teas even though they differentiated significantly in the tea-grown soils. Thehigh concentration of nitrogen in made teas could result in the high free amino acids and low polyphenolof teas. Significantly positive correlation was established between potassium and polyphenol in made teas.Teas with high ratio of phenol to free amino acids were usually good in taste and appearance.