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Journal of Arid Land  2014, Vol. 6 Issue (2): 164-173    DOI: 10.1007/s40333-013-0223-6
Research Articles     
Saline soil enzyme activities of four plant communities in Sangong River basin of Xinjiang, China
ZhengJun GUAN1,2, Qian LUO1, Xi CHEN3, XianWei FENG3, ZhiXi TANG1, Wei WEI1*, YuanRun ZHENG1
1 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
2 Department of Life Sciences, Yuncheng University, Yuncheng 044000, China;
3 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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Abstract  Soil enzyme activity plays an important role in the conversion of soil organic carbon into inorganic carbon, which is significant for the global carbon cycle. In this study, we investigated the soil enzyme activities of two ligninolytic enzymes (peroxidase and polyphenol oxidase) and five non-ligninolytic enzymes (α-1,4-glucosidase (AG); β-1,4-glucosidase (BG); N-acetyl-β-glucosaminidase (NAG); β-D-cellobiosidase (CBH); and β-xylosidase (BXYL)) in four plant communities of the Sangong River basin in Fukang, North Xinjiang, China. The four typical plant communities were dominated by Haloxylon ammodendron, Reaumuria soongonica, Salsola passerina, and Tamarix rarmosissima, respectively, with saline soils of varied alkalinity. The results showed that the soil peroxidase activity decreased seasonally. The activities of the five non-ligninolytic enzymes decreased with increasing soil depths, while those of the two ligninolytic enzymes did not show such a trend. In the four plant communities, BG had the highest activity among the five non-ligninolytic enzymes, and the activities of the two ligninolytic enzymes were higher than those of the four non-ligninolytic ones (AG, NAG, CBH, and BXYL). The community of H. ammodendron displayed the highest activity with respect to the two ligninolytic enzymes in most cases, but no significant differences were found among the four plant communities. The geometric mean of soil enzyme activities of the four plant communities was validated through an independently performed principal component analysis (PCA), which indicated that different plant communities had different soil enzyme activities. The correlation analysis showed that soil polyphenol oxidase activity was significantly positively correlated with the activities of the five non-ligninolytic enzymes. The soil pH value was positively correlated with the activities of all soil enzymes except peroxidase. Soil microbial carbon content also showed a significant positive correlation (P<0.01) with the activities of all soil enzymes except polyphenol oxidase. The results suggested that the H. ammoden-dron community has the highest ability to utilize soil organic carbon, and glucoside could be the most extensively utilized non-ligninolytic carbon source in the saline soil of arid areas in Xinjiang.
Keywords: soil enzyme activity; saline soil; Haloxylon ammodendron; Reaumuria soongonica; Salsola passerina; Tamarix rarmosissima


Received: 01 May 2013      Published: 10 April 2014
Fund:  

This work was funded by the ational Basic Research Program of China (2009CB825103), the National Natural Science Foundation of China (31200422), and China’s Postdoctoral Science Foundation (2012M520455, 2013T60193).

Corresponding Authors: Wei WEI     E-mail: weiwei@ibcas.ac.cn
Cite this article:

ZhengJun GUAN, Qian LUO, Xi CHEN, XianWei FENG, ZhiXi TANG, Wei WEI, YuanRun ZHENG. Saline soil enzyme activities of four plant communities in Sangong River basin of Xinjiang, China. Journal of Arid Land, 2014, 6(2): 164-173.

URL:

http://jal.xjegi.com/10.1007/s40333-013-0223-6     OR     http://jal.xjegi.com/Y2014/V6/I2/164

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