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| Soil Physical-chemistry and Microbial Caracteristics under Different Vegetation Restoration Modes in the Loess Hilly Region |
| Zhong Fang1, Chai Xiaohong2, Wang Guoji2, Duan Zhenghu3 |
1. Green Project Headquarter of South-north Hills Environments of Lanzhou, Lanzhou 730046, China;
2. College of Pratacultural Science/Key Laboratory of Grassland Ecosystem of Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province, Gansu Agricultural University, Lanzhou 730070, China;
3. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730070, China |
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Abstract Soil physical-chemistry (soil water content, pH, organic total carbon, total nitrogen, available nitrogen, total phosphorus, available phosphorus and available potassium) and microbial characteristics (soil microbial biomass, microbial respiration, metabolic quotient, microbial quotient) of different vegetation restoration modes were determined and analyzed in Dingxi loess hilly region. The results showed there was no significant difference of soil pH between different vegetation restoration modes. In 0-20 cm soil layer, pure plantation (CL) restoration mode had the highest content of soil organic total carbon (SOC), total nitrogen (TN), available nitrogen (AN), total phosphorus (TP), available phosphorus (AP), soil microbial biomass carbon (SMBC), soil microbial biomass nitrogen (SMBN) and microbial respiration (MR),natural (Q) restoration mode had the highest available potassium (AK), while artificial+natural (RZ) had the highest metabolic quotient (qCO2) and microbial quotient (qMB); In 20-40 cm soil layer, the highest content of SOC, TN, AN, TP and AP were consistent with 0-20 cm soil layer, AK, SMBC, SMBN, qMB and MR of RZ restoration mode was the highest among the restoration modes while the highest of qCO2 was in the restoration modes of Q. In 40-60 cm, the highest content of SOC, TN, AN, AP and TP appeared at CL restoration mode while SMBC, SMBN and qMB, MR were at the RZ restoration mode, and AK and qCO2 was the restoration modes of Q restoration mode. With the increase of soil depth, the content of SOC,TN, AN, TP, AP, AK, SMBC, SMBN, qMB and MR reduced gradually, but qCO2 rose gradually under the same vegetation restoration mode, which except for RZ restoration mode. Meanwhile, the result of correlation analysis indicated that there were significant correlations among SOC, TN, AN, SMBC, SMBN, qMB, MR and qCO2.
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Received: 26 March 2014
Published: 20 July 2014
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2014, Vol. 34 
