Response of soil dispersion and fractal dimension to conversion from slope farmland to Zanthoxylum armatum plantation

doi:10.3969/j.issn.1004-1524.2018.10.18

›› 2018, Vol. 30 ›› Issue (10): 1739-1747.DOI: 10.3969/j.issn.1004-1524.2018.10.18

• Environmental Science • Previous Articles Next Articles

Response of soil dispersion and fractal dimension to conversion from slope farmland to Zanthoxylum armatum plantation

TANG Hailong, GONG Wei^*, WANG Jingyan, SHU Zhengyue, XIONG Jing, CAI Yu, LIN Mei

College of Forestry, Sichuan Agricultural University, Sichuan Provincial Key Laboratory of Ecological Forestry Engineering, Chengdu 611130, China

Received:2018-01-19 Online:2018-10-25 Published:2018-11-02

Abstract

Abstract: The objective of the study was to evaluate the effect of conversion from slope farmland to Zanthoxylum armatum plantation on soil dispersion, fractal dimension and soil fertility characteristics, to understand the relationship between fractal dimension of soil particles and soil fertility, and to provide references for further cultivation and soil management of Z. armatum. The experiment included three treatments: (1) slope farmland (CK); (2) three-year-old Z. armatum plantation (TJ-3); (3) five-year-old Z. armatum plantation (TJ-5). Soil samples of 0-20 cm layers in the hilly area of eastern Sichuan were collected for determination of soil micro-aggregate composition, soil particle composition, nutrients contents, enzymes activities and microbe number. Membership function was used for the comprehensive evaluation of soil dispersion, fractal dimension and soil fertility. It was shown that large particle (2-0.02 mm) content increased yet small particle (<0.02 mm) content decreased in soil micro-aggregate determination after conversion from slope farmland to Z. armatum plantation. Soil structural particle index, aggregation status, aggregation degree and physical stability index, contents of organic matter, total N, hydrolysis N, available P and available K, number of bacteria, fungi, actinomycetes and total microorganisms, activities of invertase, phosphatase, urease and catalase, particle fractal dimension, and soil fertility (CVSF) of Z. armatum plantations were higher than those of CK, and the values of these indexes increased with plantation age. Soil dispersion rate, erosion coefficient, comprehensive value of soil dispersion (CVSD), and micro-aggregate fractal dimension (D) of Z. armatum were lower than that of CK and decreased with plantation age. The CVSD and D were significantly correlated to soil nutrients contents, microbes number, enzyme activities and CVSF (P<0.05). Conversion from slop farmland to Z. armatum plantation promoted transform of smaller soil micro-aggregate to larger ones, soil micro-aggregate composition and stability were improved. The indexes of CVSD and D could be used to evaluate soil fertility under land use conversion.

Key words: particle composition, micro-aggregate, soil properties, land management

CLC Number:

S714

TANG Hailong, GONG Wei, WANG Jingyan, SHU Zhengyue, XIONG Jing, CAI Yu, LIN Mei. Response of soil dispersion and fractal dimension to conversion from slope farmland to Zanthoxylum armatum plantation[J]. , 2018, 30(10): 1739-1747.

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Response of soil dispersion and fractal dimension to conversion from slope farmland to Zanthoxylum armatum plantation

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