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复合养殖对柑橘林土壤微团聚体分形特征及理化性质的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2017年05期
Page:
92-98
Column:
研究论文
publishdate:
2017-09-30

Article Info:/Info

Title:
Effects of compound management in citrus orchard on soil micro-aggregate fractal features and soil physical and chemical properties
Article ID:
1000-2006(2017)05-0092-07
Author(s):
SHU Zhengyue WANG Jingyan* GONG Wei LYU Xiangnan YAN Siyu CAI Yu ZHAO Changping
Sichuan Provincial Key Laboratory of Ecological Forestry Engineering in the Upper Reaches of Yargtze River, College of Forestry, Sichuan Agricultural University, Chengdu 611130, China
Keywords:
Keywords:compound management of economic forest citrus forest density of chickens soil micro-aggregate feature fractal dimension soil physical and chemical properties
Classification number :
S714.7; S157.1
DOI:
10.3969/j.issn.1000-2006.201605004
Document Code:
A
Abstract:
【Objective】Soils in the surface layer(0-20 cm)were collected to determine soil micro-aggregate features and soil physical and chemical properties when chickens were raised in different densities(0, 600, 1 200, and 2 400 chickens per hm2). The proportion of characteristic soil micro-aggregates(PCM, <0.02 mm/(≥0.02-0.25 mm))and the ratio of soil micro-aggregates diameter(RMD, <0.02 mm/(≥0.02-2.00 mm))and the factal dimension(D)were calculated. The relationships of soil physical and chemical properties with these indices were evaluated. 【Method】Citrus orchards in a low hill area of Sichuan Basin were taken as objects and four 20 m×20 m sample plots were created, with three replicates each, and chickens were raised in each plot at one of four densities(0, 600, 1 200, or 2 400 chickens per hectare). The S type of the five-point sampling method was used for stratification and sampling of the soil(0-20 cm). The soil micro-aggregate composition, the contents of organic matter, total nitrogen, hydrolyzed nitrogen, total phosphorus, available phosphorus, total potassium, available potassium, and soil physical properties were measured. 【Result】 The results show that raising chickens in citrus orchards increases large particle(≥0.02-2.00 mm)content and decreases small particle(<0.02 mm)content in soil micro-aggregates. Moreover, PCM, RMD and D presented a decreasing trend as the density of chickens increased. PCM, RMD and D had significantly negative correlation(P<0.05)with soil water content, non-capillary porosity, capillary porosity, total porosity, ventilation degree, organic matter, total nitrogen, hydrolyzed nitrogen, total phosphorus, available phosphorus, total potassium, and available potassium while had significantly positive correlation with soil density. 【Conclusion】 These findings indicate that raising chickens in citrus orchards is beneficial for promoting transformation from smaller soil micro-aggregates to larger micro-aggregates and could improve soil micro-aggregate composition, while decreasing PCM, RMD, and D. PCM, RMD and D can be used as important comprehensive quantitative indices to evaluate soil physical and chemical properties when raising chickens in a forest ecosystem.

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