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 NameAffiliation
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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