Welcome to visit Scientia Silvae Sinicae,Today is

Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (9): 10-17.doi: 10.11707/j.1001-7488.20140902

Previous Articles     Next Articles

Composition and Fractal Features of Soil Micro-Aggregates in Camellia sinensis Plantations, Sichuan Province

Wang Shengqiang, Zheng Zicheng, Li Tingxuan   

  1. College of Resources and Environment, Sichuan Agricultural University Chengdu 611130
  • Received:2013-05-22 Revised:2014-07-30 Online:2014-09-25 Published:2014-09-30
  • Contact: 李廷轩

Abstract:

Through a field survey and laboratory analysis, the composition and fractal features of soil micro-aggregates in different Camellia sinensis plantations with different ages were studied. Results showed that 0.25~0.05 mm fraction made up the largest proportion and accounted for 41.95%~55.44% of total micro-aggregates, followed by 0.05~0.01 mm fraction that accounted for 23.54%~25.66%, and <0.001 mm fraction accounted for the smallest proportion of 5.80%~8.71%. The percentage of 0.25~0.05 mm fraction presented an increasing trend as the increase in tea plantation age, however, the percentages of 0.005~0.001 mm and <0.001 mm fractions showed an inverse trend. Moreover, the values of mean weight soil surface area (MWSSA) and fractal dimension (D) of soil micro-aggregates and compositional proportion of characteristic soil micro-aggregates PCM (<0.005 mm)/(0.25~0.05 mm) presented a decreasing trend as the increase of tea plantation age, however, the value of mean weight diameter (MWD) of soil micro-aggregates displayed an increasing trend. The values of soil micro-aggregates D and soil PCM had negative correlation with contents of soil organic matter, total N and P and available N and P. Long-term tea planting was beneficial to promoting transformation from smaller soil micro-aggregates to larger micro-aggregates, thereby improving soil micro-aggregates stability. Thus, values of soil micro-aggregates D and soil PCM can be used as the quantitative evaluation indicators of soil fertility in tea plantations.

Key words: tea plantation age, soil micro-aggregates, composition feature, fractal feature

CLC Number: