[1]CHAI Chengwu,WANG Lide,YU Qiushi,et al.Change Characteristics of Soil Particle Composition and Nutrient of Abandoned Farmland in Different Years in Qingtu Lake Area in Minqin[J].Research of Soil and Water Conservation,2020,27(04):99-104.
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Change Characteristics of Soil Particle Composition and Nutrient of Abandoned Farmland in Different Years in Qingtu Lake Area in Minqin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 04
Page number:
99-104
Column:
目次
Public date:
2020-06-20
- Title:
- Change Characteristics of Soil Particle Composition and Nutrient of Abandoned Farmland in Different Years in Qingtu Lake Area in Minqin
- CLC:
- Q948
- DOI:
- -
- Abstract:
- Studied the characteristics of soil particle composition and nutrient of abandoned farmland as the research object of the typical district in different years in Qingtu Lake area in Minqin by the spatio-temporal substitution method. The results show that:(1)the total soil particle composition in different years was sand>silt>clay>coarse sand. And there were significant differences in the content of clay between CK and the soil layer of 0—20 cm and 20—40 cm. But the content of clay in the soil tended to be stable with the increase of the year, and there was no significant difference between the two soil layers. The structural content of silt and sand changed sharply in CK and 2 years later, and there were significant differences between 0—20 cm and 20—40 cm soil layers in the same year, and then the differences between the two soil layers and the years of conversion were not significant with the increase of the years of conversion, gradually becoming stable. The content of coarse sand is relatively stable only in CK and 2 years later, but which changes greatly in 4—40 years after conversion, there is instability in the same year, and significant differences shows among soil layers.(2)The overall change trend of the three soil nutrients decreased with the increase of the years of abandoned farmland, and finally became stable. In the same years, the content of soil nutrients in 0—20 cm soil layer was more than in 20—40 cm, and the content difference between the two layers decreased with the increase of the years of abandoned farmland, especially the content of soil organic matter and available phosphorus are obvious. The content of soil organic matter changed greatly in the period of CK～8 years, and there was a sharp turning point in the period of 4 years later, and the change range was small in the period of 13～40 years. The content of total nitrogen was the most stable in the three kinds of soil nutrients, and the change range was small in the whole time. The content of soil available phosphorus was the largest in CK, especially in the 0—20 cm of soil surface layer is the most obvious, and then it shows a trend of fluctuating decline with the increase of the years of abandoned land, and tends to be stable.
- References:
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Last Update:
2020-07-09