鄂尔多斯高原不同年限弃耕农田土壤养分特征

doi:10.16843/j.sswc.2018.02.006

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Abstract [Background]:Plant community succession and soil nutrients change affects each other, and it is significant to research soil nutrient change in abandoned croplands with different years for us to understand plant community succession process.[Methods] Abandoned croplands at different years in the regions of Ruanliang and Yingliang in the Ordos Plateau, China, were selected (abandoned time was 1, 6, 10, 15, and 20 years in Ruanliang; and 3, 6, 10, 15 and 20 in Yingliang) to conduct field investigation for analyzing change of soil nutrients during vegetation succession.[Results] In the abandoned cropland in Ruanliang, except fluctuations of total carbon and total potassium, soil total nitrogen and total phosphorus increased gradually with increasing abandoned years, while total nitrogen and total phosphorus decreased with increasing soil depth. In the abandoned cropland in Yingliang, with increasing abandoned years, soil total carbon increased and then decreased generally; soil total nitrogen decreased and then increased at 0-10 cm soil layer, increased and then decreased at other soil layers; soil total phosphorus increased and then decreased at 0-30 cm soil layer, decreased and then increased at other soil layers; soil total potassium increased and then decreased at 0-10 cm soil layer, decreased at other soil layers. With increasing of soil depth, total carbon decreased in 20 year's abandoned cropland and natural vegetation, increased in other year's abandoned croplands; soil total nitrogen fluctuated in 6 year's abandoned cropland, decreased in other years' abandoned croplands; total phosphorus decreased and then increased in 10 years' abandoned cropland and natural vegetation, decreased in other year's abandoned croplands; soil total potassium did not show obvious changing trends. With the increasing abandoned years, soil C/N decreased, then increased, decreased finally in the abandoned cropland in Ruanliang and Yingliang. With the increasing soil depth, soil C/N decreased in natural vegetation, increased in other years' abandoned croplands in the abandoned cropland in Ruanliang; soil C/N increased in the abandoned cropland in Yingliang.[Conclusions] During vegetation succession, abandoned yeas and soil depth had significant effects on soil nutrients, and soil nutrient was higher in surface soil layers. The study provids scientific basis for vegetation restoration of abandoned cropland in the Ordos Plateau.

Key words： shrub encroachment abandoned cropland soil nutrient Ordos Plateau

Received: 29 June 2017

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S154

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	Articles by authors
	YANG Liu
	CAI Wentao
	LAI Liming
	ZHOU Jihua
	JIANG Lianhe
	ZHENG Yuanrun

Cite this article:

YANG Liu,CAI Wentao,LAI Liming, et al. Characteristics of soil nutrients in abandoned croplands at different abandoned years in the Ordos Plateau[J]. SSWC, 2018, 16(2): 39-46.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2018.02.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2018/V16/I2/39

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