| Effects of different plant cover of Reaumuria soongorica on soil carbon and nitrogen in different variety and soil bacterial diversity |
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| DOI：10.7606/j.issn.1000-7601.2009.04.30 |
| Key Words: Reaumuria soongorica plant cover microbial biomass soil bacterial diversity PCR-DGGE |
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| Abstract: |
| Soil quality restoration and soil management is the key for vegetation restoration and eco-environment sustainable development for the hilly region of the semiarid Loess Plateau. In order to provide scientific reference for vegetation restoration and soil care in the Loess Plateau, the change of soil carbon and nitrogen in different variety and soil bacterial diversity was studied by designing five gradient levels of plant cover of Reaumuria soongorica at Lanzhou Experiment Base of Environmental Afforestation of South-North Mountains. The results showed: soil organic carbon (SOC), total nitrogen (TN), soil microbial biomass C (MBC) and microbial biomass N (MBN) gradually increased with vegetation cover，SOC, TN, MBC and MBN increased quickly before the vegetation cover approaching 48.73%. There were similar trend between soil microbial biomass (MBC and MBN) and nutrients (SOC and TN) under the same vegetation cover, which indicted that the organic fertilizer could provide energy for the growth of microbe. Soil bacterial diversity increased with vegetation cover, and then gradually remained at a quite constant level, although soil microbial community's structure was different fro
m each other under different vegetation cover. It implies that in arid and semiarid areas with sparse vegetation and lower plant diversity, the increase of the vegetation cover of Reaumuria soongorica changed obviously the ecological function of the soil. However, the unilateral increase of vegetation cover will have less effect to the soil properties. |
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