Effects of enclosure on soil organic carbon mineralization of desert steppe in Ningxia

doi:10.3969/j.issn.1004-1524.2017.09.18

›› 2017, Vol. 29 ›› Issue (9): 1549-1554.DOI: 10.3969/j.issn.1004-1524.2017.09.18

• Environmental Science • Previous Articles Next Articles

Effects of enclosure on soil organic carbon mineralization of desert steppe in Ningxia

TAO Libo^{1, 2}, WANG Jianjun³, WANG Guohui^{1, 2}, YU Shuang^{1, 2}, LI Huihui¹, XU Dongmei^{1, 2, *}

1. School of Agriculture, Ningxia University, Yinchuan 750021, China;
2. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Yinchuan 750021, China;
3. Tongxin Middle School, Tongxin 751300, China

Received:2017-02-24 Online:2017-09-20 Published:2017-09-27

Abstract

Abstract: In the present study, grazing grassland and grassland enclosed for 3, 5, 8, 11 a of desert steppe were selected as study objects in Yanchi County, Ningxia Province, to study the soil organic carbon mineralization potential by indoor constant temperature incubation. It was shown that with the increase of enclosing year, the accumulative soil organic carbon mineralization showed an increasing trend as 11 a enclosed grassland>8 a enclosed grassland>5 a enclosed grassland>grazing grassland>3 a enclosed grassland. From the 1^st day to the 7^th day, the mineralization rates decreased rapidly. From the 7^th day to the 13^th day, the rates rose slowly. Then, the rates decreased until the 27^th day to be stable. With different enclosing year, the amount of potential mineralization carbon pools (C₀) of the grassland decreased in sequence of 11 a enclosed grassland>8 a enclosed grassland>grazing grassland>5 a enclosed grassland>3 a enclosed grassland. The soil half-life of 8 a enclosed grassland was significantly (P<0.05) lower than others. Therefore, according to the soil organic carbon mineralization characteristics and the situation of vegetation restored, the grassland could be appropriately used after enclosing for 5 years.

Key words: enclosure, desert steppe, soil organic carbon mineralization, potential mineralization carbon pool

CLC Number:

S153

TAO Libo, WANG Jianjun, WANG Guohui, YU Shuang, LI Huihui, XU Dongmei. Effects of enclosure on soil organic carbon mineralization of desert steppe in Ningxia[J]. , 2017, 29(9): 1549-1554.

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Effects of enclosure on soil organic carbon mineralization of desert steppe in Ningxia

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