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浙江大学学报（农业与生命科学版）
Journal of Zhejiang University (Agriculture and Life Sciences)  2014, Vol. 40 Issue (5): 541-550    DOI: 10.3785/j.issn.1008-9209.2013.11.261
Resource & environmental sciences     
Effects of planting alfalfa on soil quality in desert steppe of Ningxia
Chen Lin， Yang Xinguo， Song  Naiping*， Li  Xuebin，  Zhai  Deping
(Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in North-Western China of Ministry of Education / Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of North-Western China / Union Research Center for Ecology and Exploitation of Biological Resources in Western China， Ningxia University， Yinchuan 750021，  China
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Abstract  Soil quality plays a crucial role in sustaining agricultural systems productivity, and it is important in sustaining ecosystem. What about the soil quality in different planting  years of alfalfa ( Medicago sativa) in the steppe desert of Ningxia in China? That is not yet completely understood. The objective of this study was to investigate the soil physical and chemical properties of different soil particle diameters (>0.5 mm, 0.1060.25 mm and <0.106 mm) after planting alfalfa for 012 years. By using the method of replacing time with space, an analysis was made on the dynamic changes of top soil (020 cm and 2040 cm) nutrients and soil particle。
The results showed that  there was no significant difference between the different soil particle diameters in the same period of the pH, electrical conductivity (EC), soil organic matter (SOM), CaCO3, total nitrogen (TN), available nitrogen (AN), total phosphorus (TP) and available phosphorus (AP)  (P>0.05), but the soil active organic carbon  (SAOC) contents of the soil particle with diameters of >0.5 mm and <0.106 mm were significantly higher than that of soil particle with diameters of 0.1060.25 mm  (P<0.05). With the increasing of planting years, the pH values decreased, and after planting alfalfa, it was greater affected in 2040 cm soil layer than 020 cm soil layer. The EC values were fluctuated in different planting years, but there were not significant  (P>0.05), and the EC values of 020  cm soil layer were significantly higher than that of 2040 cm soil layer in most planting years. The SOM contents in each planting year were higher than the grass, but there was no significant difference  (P>0.05), and the SOM contents of soil particle with diameters of >0.5 mm and <0.106 mm in 020 cm soil layer were increased firstly  (1 year) and then decreased  (412 years) with the increase of planting years, while the SAOC contents of 2040 cm soil layer remained unchanged. The SAOC contents of soil particle with diameters of >0.5 mm and <0.106 mm in 040 cm soil layer in each planting year were significantly higher than that of soil particle with diameters of 0.1060.25 mm  (P<0.05), but there was no significant difference in each planting year  (P>0.05). The TN and AN contents in 040 cm soil layer fluctuated a lot and showed no influence on TN content. The TP contents of 040 cm soil layer and the AP contents of 020 cm soil layer showed the increasing trend (012 years), and the AP contents of 2040 cm soil layer showed the “M” type fluctuations. The TP contents of 020 cm soil layer were significantly lower than those of the 2040 cm soil layer in 112 years  (P<0.05). The C/N values of 020 cm soil layer were higher than those of the 2040 cm soil layer in the same planting years, and in 12 years, the C/N value was significantly lower than other years  (P<0.05). The CaCO3 contents of 040 cm soil layer showed an increasing trend with the increasing of planting years, and the CaCO3 contents of 2040 cm soil layer were significantly higher than those of 020 cm soil layer  (P<0.05). In conclusion, with the increasing of planting years, there was significant difference only between the soil particle diameter and the SAOC content  (P<0.05), and the soil quality showed temporal variability.  

Published: 20 September 2014
CLC:  S 154.1  
     
  S 344  
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Chen Lin
Yang Xinguo
Song Naiping*
Li Xuebin
Zhai Deping
Cite this article:

Chen Lin， Yang Xinguo， Song Naiping*， Li Xuebin， Zhai Deping . Effects of planting alfalfa on soil quality in desert steppe of Ningxia. Journal of Zhejiang University (Agriculture and Life Sciences), 2014, 40(5): 541-550.

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http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2013.11.261     OR     http://www.zjujournals.com/agr/Y2014/V40/I5/541


种植年限对荒漠草原区苜蓿地表层土壤特性的影响

采用时空互代法，研究宁夏中部荒漠草原区不同种植年限苜蓿地表层土壤理化性状特征。结果表明:3种粒径（>0.5 mm，0.106~0.25 mm,<0.106 mm）间土壤的pH、电导率（electrical conductivity，EC）、有机质（soil organic matter，SOM）、CaCO3、全氮（total nitrogen，TN）、碱解氮（available nitrogen，AN）、全磷（total phosphorus，TP）和速效磷（available phosphorus，AP）在同一种植年限间差异均无统计学意义（P>0.05），但>0.5 mm和<0.106 mm粒径的土壤活性有机碳（soil active organic carbon，SAOC）含量均显著高于0.106~0.25 mm粒径，相比差异有统计学意义（P<0.05）;随着种植苜蓿年限的增加，pH值有所降低，且苜蓿种植后对20~40 cm土层土壤pH值的影响大于0~20 cm;而EC值在苜蓿不同种植年限间波动较大，相比差异均无统计学意义（P>0.05），多数年限间0~20 cm土层土壤EC值高于20~40 cm土层（P<0.05）;SOM在苜蓿种植后的各年限间均较草地高，相比差异无统计学意义（P>0.05），0~20 cm以SOM较20~40 cm高;0~20 cm土层>0.5 mm和<0.106 mm粒径的SAOC随种植年限增加呈先升高（1 a）后降低（4~12 a）的趋势，而20~40 cm则基本没有变化。0~40 cm土层中>0.5 mm和<0.106 mm粒径的SAOC在各种植年限间均显著高于0.106~0.25 mm，相比差异有统计学意义（P<0.05），而0.106~0.25 mm粒径的SAOC在不同年限间差异无统计学意义（P>0.05）;0~40 cm土壤TN和AN波动较大，但没有显著提高土壤氮的质量分数，相比差异无统计学意义（P>0.05）;0~40 cm土层土壤TP和0~20 cm土层土壤AP的变化趋势均为随着种植年限（0~12 a）的增加而增大，而20~40 cm土层的AP则表现为“M”型波动。1~12 a间0~20 cm土层的TP均显著低于20~40 cm，相比差异有统计学意义（P<0.05）;0~20 cm土层土壤C/N在同一年限均高于20~40 cm土层，在12 a时，各粒径C/N显著减小，相比差异有统计学意义（P<0.05）;0~40 cm土壤CaCO3随着种植年限的增加呈升高的趋势，且在种植苜蓿12 a后20~40 cm土层的CaCO3显著高于0~20 cm，相比差异有统计学意义（P<0.05）。
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