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《Journal of Zhejiang University(Agriculture and Life Sciences)》 2015-02
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Effects of different planting-years of artificial Caragana intermedia shrubs on soil organic carbon, nitrogen and phosphorus stoichiometry characteristics in desert steppe

Pan Jun;Song Naiping;Wu Xudong;Yang Xinguo;Chen Lin;Qu Wenjie;Zhai Deping;Breeding Base of State Key Laboratory for Preventing Land Degradation and Ecological Restoration, Ningxia University;Union Research Center for Ecology and Exploition of Biological Resources in Western China, Ningxia University;College of Agriculture, Ningxia University;  
The thicketization of the shrub has become a common phenomenon in the arid and semi-arid steppe worldwide. The Caragana intermedia has been widely used to prevent grassland degradation because of its low transpiration rate, strong resistance and wide adaptability to the environment. The life activity of C. intermedia was notonly restricted by water shortage, but also limited by soil nutrients and environmental stress. This paper revealed the balance and cycle process of soil organic carbon( SOC), total nitrogen( TN) and total phosphorus( TP) in the soil, in which artificial shrub and grass were mixed planting. Therefore, the results can provide basic data for research on the balance and circulation of SOC, TN, TP in the soil of desert grassland ecosystems.The artificial C. intermedia shrubs in different planting-years( 9 a, 17 a, 27 a) were taken as research objects, to analyze the contents and the ecological stoichiometry of SOC, TN, TP in the depth of 0-40 cm.The result showed that the SOC and TN contents of the artificial C. intermedia shrubs with different planting-years had significant differences in the vertical section( P 0. 01). The contents of SOC and TN in shrubs increased with the planting-years, but decreased with soil depth from 0 to 40 cm, indicating surface accumulation of SOC and TN in the soil. For SOC and TN contents in any part of the shrubs, the order was inside edge outside. The contents of TP increased in all the parts of the shrubs with the planting-years, but the soil C / N ratio of each shrub decreased gradually.Furthermore, the soil C / P ratio first decreased and then increased on the edge and the inside of the shrubs, while gradually increased in the outside of the shrubs. The soil N / P ratio in the inside and outside of shrubs both showed increasing trends, and first decreased and then increased in the edge of the shurbs. The soil C / N ratio increased gradually with the increasing soil depth, while the C / P and N / P ratios first decreased and then increased as a whole. The N / P ratio had a significant negative correlation with the TP content( P 0. 01), and significant positive correlations with the TN content and the C / P ratio( P 0. 01).In conclusion, the soil nutrients in artificial C. intermedia shrubs show a significant surface accumulation and "fertile island" effect. As the growth of C. intermedia shrubs was affected by various factors, further research should be considered on the N / P stoichiometry characteristics of vegetation and soil ecosystem, and the relations between the limiting nutrients of soil N, P and the nutrient adaptability characteristics of vegetation.
【Fund】: 国家重点基础研究发展计划(973计划)前期专项(2012CB723206);; 国家自然科学基金(41461046;31460123;31460161)
【CateGory Index】: S793.3
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