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| Effects of agricultural utilization on soil carbon， nitrogen content， and microbial biomass in Mu Us Sandy Land |
| Received:April 25, 2020 |
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| KeyWord:Mu Us Sandy Land;soil microbial biomass;agricultural utilization;soil quality |
| Author Name | Affiliation | E-mail | | XUE Ying-long | School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China | | | LI Chun-yue | School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China | chunyue_li@snnu.edu.cn | | WANG Yi | Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China | | | MIAO Yu | School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China | | | CHANG Shun | School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China | |
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| Abstract: |
| Studies on the effects of different types and methods of agricultural utilization on soil carbon and nitrogen, as well as the microbial characteristics, in Mu Us Sandy Land are reviewed herein, and the changes of soil nutrients and microbial biomass of sandy land in arid areas are revealed. This study has important theoretical guiding significance for improving the soil environment of sandy farmland and preventing the degradation of these land systems. This study takes the Gechougou Valley, which is located in the Mu Us Sandy Land, as a research site, selecting the different agricultural usage types and methods of traditional agriculture(Triticum aestivum, Oryza sativa, Upland rice), agricultural facilities(Graptopetalum blackberry, Lonicera caerulea L. var. edulis Turcz. ex Herd, Vitis vinifera), and intensive agriculture(Solanum tuberosum) as research objects. Furthermore,it uses the sand as a comparative medium,analyzing different agricultural usage types and methods on soil carbon, nitrogen, respiration, and microbial effects of Mu Us Sandy Land. The results show that:Different types and modes of agricultural utilization had certain effects on soil microbial biomass carbon and nitrogen, among which several agricultural utilization types had more significant effects. Microbial biomass carbon showed the highest level in facility agriculture and microbial biomass nitrogen showed the highest level in intensive agriculture(8.45 mg·kg-1), significantly higher than other agricultural utilization types. Compared with sandy land, the content of total carbon, total nitrogen, and mineralized nitrogen in the soil of seven agricultural utilization methods was significantly increased. The contents of total carbon, organic carbon, and total nitrogen in the soil of the three agricultural utilization types were the highest in the various sites of facility agriculture, with mean values 6.32, 3.82, and 10.14 times of those in sandy land, respectively. Soil nitrate and mineralized nitrogen were the highest in intensive agriculture and their mean values were 6.46 and 8.21 times of those in sand, respectively. Under different agricultural utilization methods, the ammonium nitrogen content of the soil in other agricultural utilization modes was significantly reduced by 8.70%~56.32% compared with that in sandy land, except rice land and sorbita ruba land. In addition to upland rice fields, the soil respiration rate of other agricultural utilization methods significantly increased by 60.17%~194.07% compared to that of sandy land. Correlation analysis showed that there was a significant positive correlation between total carbon, organic carbon, total nitrogen, and microbial biomass carbon, while there was a significant positive correlation between nitrate and microbial biomass nitrogen. The agricultural utilization of sandy land affected the life activities of microorganisms to different degrees and reduced the content of ammonium nitrogen in the soil. Traditional and intensive agriculture accelerated the decomposition of soil organic matter and promoted the mineralization of soil nitrogen. Facility agriculture had advantages in increasing the soil carbon and nitrogen content. |
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