| The soil carbon, nitrogen, and phosphorus contents and their stoichiometry under different land uses in loess hilly region |
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| DOI：10.7606/j.issn.1000-7601.2019.04.16 |
| Key Words: land use mode soil carbon, nitrogen and phosphorus stoichiometry environmental factor canonical correlation analysis |
| Author Name | Affiliation | | BAI Yi-ru | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China | | ZHANG Xing | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China | | BAO Wei-bin | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China | | WANG You-qi | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China | | ZHAO Yun-peng | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| Land use change will break the balance of carbon (C), nitrogen (N), phosphorus (P) in ecosystem, thus affecting the mineralization, transportation, absorption and utilization of C, N, and P elements in soil. There were 288 soil samples collected from the 0~100 cm soil layer in millet, alfalfa, caragana, and jujube land to study soil C, N, and P contents and their stoichiometry of C/N, C/P, and N/P. The results showed that the average soil C, N, and P contents were 2.12, 0.21 g·kg-1 and 0.43 g·kg-1, respectively, which indicated poor nutrient status. The mean values of soil C/N, C/P, and N/P were 10.83, 5.0, and 0.48, respectively. Variation coefficients of SOC, TN, TP, C/N, C/P, and N/P were between 10% and 100%, indicating moderate variation. The results showed that land use had remarkable effect on soil C, N, P, C/N, C/P, and N/P. The 0~20 cm soil C content of millet land was significantly higher than that of jujube and caragana land (P<0.05). The 20~40 cm soil C content of millet land was significantly higher than that of alfalfa land (P<0.05). The soil N contents of 0~20, 20~40, and 60~80 cm layers of millet land were significantly higher than that of caragana land (P<0.05). The soil P contents of 0~20, 60~80, and 80~100 cm layers from alfalfa land were significantly higher than that of caragana land (P<0.05). The soil C and N of jujube, alfalfa, and millet land tended to distribute in surface soil. The soil C and N of caragana land scarcely decreased as the soil depth increased, which indicated high ability of carbon fixation capacity. There were significant differences in C/N among different land uses (P<0.05) with highest value in caragana land soil and the lowest value in millet land. The C/P under 80~100 cm soil layer was significantly different between caragana land and alfalfa land (P<0.05). There were significant differences for 0~20 and 20~40 cm N/P among different land uses (P<0.05) with the highest value in millet land and the lowest value in caragana land. The canonical correlation analysis showed that soil C, N, C/P, and N/P were significantly related to environmental factors such as soil depth, clay content, and soil pH. |
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