Saline soil enzyme activities of four plant communities in Sangong River basin of Xinjiang,China

查看全文 作　　者：ZhengJun [1,2]GUAN;Qian [1]LUO;Xi [3]CHEN;XianWei [3]FENG;ZhiXi [1]TANG;Wei [1]WEI;YuanRun [1]ZHENG

机构地区：[1]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences;[2]Department of Life Sciences,Yuncheng University;[3]Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences

出　　处：《Journal of Arid Land》索引2014年第6卷第2期,共10页

基　　金：National Basic Research Program of China (2009CB825103);National Natural Science Foundation of China (31200422);China’s Postdoctoral Science Foundation (2012M520455, 2013T60193) 摘　　要：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);andβ-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.ammodendron 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. 关键词：土壤酶活性植物群落三工河流域新疆北部氨基葡萄糖苷酶木质素降解酶中国过氧化物酶活性

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Saline soil enzyme activities of four plant communities in Sangong River basin of Xinjiang,China

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