我国东部水蚀区坡耕地土壤质量现状分析

doi:10.16843/j.sswc.2017.03.005

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Abstract [Background] Soil quality is the foundation of land productivity. Sloping farmland is an important kind of cultivable land resource in the water erosion zone of China. The current study is aimed at investigating the general situation of sloping farmland soil quality in this region. [Methods] We collected 36 soil samples from the soil layer of 0-20 cm in this region dispersedly and tested 28 soil physical and chemical indicators for each soil sample. The method of principal component analysis (PCA) was used to select the key indicators for soil quality analysis. Membership functions were used to transform the key indicators into dimensionless data, and the weighted multiplication method was applied to calculate soil quality index (SQI) for each sampling point. [Results] 1) The variation coefficient of available P was the maximum, and the variation coefficient of microaggregate volume fraction was the minimum. Most of the indicators had intermediate variability. The mean variation coefficient of soil physical indicators was much smaller than soil chemical indicators. 2) The key indicators for assessing soil quality were clay volume fraction, silt volume fraction, microaggregate volume fraction, soil organic matter, pH,Cd and Cr. Cr had the highest membership value, while pH had the lowest membership value. The membership values of Cd were significantly different between the six secondary partition regions. 3) The mean value of the SQI was 0.64±0.16. There was no significant difference about SQI between the six secondary partition regions. The proportions of SQI ranked as low, middle, high, higher level were 8.33%, 38.89%, 36.11% and 16.67% of the total area of sloping farmland, respectively. [Conclusions] On the whole, the general situation of sloping farmland soil quality in the region was fine, but we still need to strengthen fertilization and amelioration in the regions with low soil quality. These findings of the study had great significance for understanding and maintaining sloping farmland soil quality, soil quality grade classification and regionalization, exploiting and utilizing land resource reasonably in the eastern water erosion zone of our country.

Key words： soil quality principal component analysis key indicator soil quality index sloping farmland the eastern water erosion zone of China

Received: 22 July 2016

PACS:	S158
	S159.2

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	Articles by authors
	MA Qianhong
	ZHANG Guanghui
	GENG Ren
	WANG Hao

Cite this article:

MA Qianhong,ZHANG Guanghui,GENG Ren, et al. Present condition analysis of sloping farmland soil quality in the eastern water erosion zone of China[J]. SSWC, 2017, 15(3): 36-42.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2017.03.005 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2017/V15/I3/36

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