Scientia Agricultura Sinica ›› 2019, Vol. 52 ›› Issue (8): 1425-1434.doi: 10.3864/j.issn.0578-1752.2019.08.012

• HORTICULTURE • Previous Articles     Next Articles

Soil Nutrient Status in Wuyi Tea Region and Its Effects on Tea Quality-Related Constituents

ZHOU Zhi1,LIU Yang1,ZHANG LiMing2,XU RuiNeng1,SUN LiLi1,LIAO Hong1()   

  1. 1 Root Biology Center, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002
    2 College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002
  • Received:2018-11-25 Accepted:2018-01-22 Online:2019-04-16 Published:2019-04-26
  • Contact: Hong LIAO


【Objective】 The objective of this research was to study the relationship between soil nutrient status and tea quality in Wuyi Tea Region, the main production area of Oolong tea, so as to provide theoretical basis for improving nutrient management in tea plantation and subsequent tea quality. 【Method】 Based on the soil survey data from Fujian Province in 2008, 68 tea plantations from three main tea production areas, including 12, 32 and 24 tea plantations from Tongmu, Rock tea and Zhou tea area, respectively, were randomly selected in Wuyi Tea Region in 2015. Soil samples from 0-20 cm top soil layer and one-tip-three-leaf tissue samples were collected from each tea plantation. Five soil nutrient indexes, including pH value, soil organic matter (SOM), alkaline nitrogen (AN), available phosphorus (AP) and available potassium (AK) concentrations in the top 0-20cm soils, and the concentrations of 6 secondary metabolites as quality factors in the fresh tea leaves (theanine, caffeine, rutin, ECG, EGCG and total catechins) were quantitatively measured by High Performance Liquid Chromatography (HPLC). 【Result】 Comparative analysis of soil nutrient indexes in 2008 and 2015 showed that soils throughout the Wuyi Tea Region were severely acidified, and those in a number of locations there were dramatic increased in AP over that time span. Among the three main tea production areas, soil nutrient status in Rock tea area was most significantly changed, which pH value, SOM and AN concentrations were reduced 0.65, 45.29% and 49.39%, respectively. While its AP was largely increased from 5.21 mg?kg -1 to 245.70 mg?kg -1 with over 40 times increase, indicating that excessive fertilization existed in the tea plantations of this region. Soil nutrient status significantly affected tea quality, with each quality factor being uniquely affected by particular soil nutrient indexes. The results from the marginal effect analysis revealed that the highest concentration of each secondary metabolite was associated with a corresponding suitable range for each soil nutrient index. Based on these associations, we proposed the suitable soil nutrient ranges for high-quality tea plantations in the Wuyi Tea Region were as follows: pH, 4.5-5.0; SOM, 20-40 g·kg -1; AN, 60-100 mg·kg -1; AP, 10-100 mg·kg -1; and AK, 100-150 mg·kg -1. 【Conclusion】Taken together, we suggested that the overall nutrient management in the areas of Rock tea and Zhou tea of Wuyi Tea Region were as follows: partially replace chemical fertilizers with organic fertilizers, properly supplement nitrogen and potassium, while strictly control phosphorus fertilization.

Key words: soil nutrient, tea, quality components, secondary metabolites, nutrient index, Wuyi tea region

Fig. 1

Map of soil sampling sites in 2008 (A) and 2015 (B)"

Table 1

Statistical characteristics of soil nutrient in farmland soils in 2008 (n=3671)"

土壤属性Soil properties 最小值Min 最大值Max 平均值Mean 标准差SD 变异系数CV (%)
pH 3.60 7.40 4.70 0.31 6.60
有机质SOM (g·kg-1) 4.50 84.40 39.59 11.02 27.84
碱解氮 AN (mg·kg-1) 24.00 427.00 177.93 43.37 24.37
有效磷 AP (mg·kg-1) 0.60 166.00 16.87 16.70 98.99
速效钾 AK (mg·kg-1) 2.00 289.00 68.60 38.06 55.48

Fig. 2

Spatial distribution of soil nutrient status in cultivation land of Wuyi mountain area in 2008 The red ”☆” in the figures indicate the locations of sampling sites in 2015"

Fig. 3

Soil nutrient status in different regions of Wuyi Tea Region in 2008 and 2015 *: significantly different between 2008 and 2015 (P<0.05, t-test). Different letters above bars denote significant differences among different regions at the same year (P<0.05, lowercase letters: 2008; capital letters: 2015)"

Fig. 4

Relationship between soil nutrient status and secondary metabolites in Wuyi Tea Region The green and red dots represent the actual values and fitting boundary values of secondary metabolites in tea leaves corresponding to soil nutrients in different tea regions, respectively"

Fig. 5

Comparative analysis of soil nutrient status in Wuyi Tea Region on secondary metabolites of tea leaves"

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