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Abstract
The microcalorimetric method was applied to analyze the influences of successive reforestations with Eucalyptus granddis × E. uophylla, Pinus massoniana, and continuous sugarcane production on the soil microbial activities. 500 g of each refined representative sample was collected in rainy and dry seasons from four 100 m2 homogeneously and perfectly defined acrisol quadrats in subtropical China. Two of them were Eucalyptus plantations with 10 (E10) and 20 (E20) year–old stands. The other two were 10–year–old pine tree plantation (P10) and sugarcane land (SL10) correspondingly contiguous to E10 and E20 and used as references for E10 and E20, respectively. Blocks of E10/P10 were 1500 m away from that of E20/SL10. Microcalorimetric experiments were carried out using 1.2 g soil samples and 0.6 ml of solution containing 5.0 mg of glucose and 5.0 mg of ammonium sulphate at 28°C. The effects of land management practice on soil quality were examined by measuring their physicochemical and biological properties. The results showed that: 1) zymogeneous bacteria were the dominated microbes in the land of continuous sugarcane production, but autochthonous floras were the ones for forest; 2) when compared with its control (SL10), land of eucalyptus (E20) had lower soil packing degree and inhibitory effect on microbial activities, but higher seasonal fluctuation in microbe constitution and activities under the same circumstance; 3) compared with its control P10, the land of eucalyptus E10 had alike soil packing degree and higher seasonal fluctuation degree of microbial activities, but lower inhabiting degree of soil microbial metabolism. Key words: Microcalorimetry, microbial activity, eucalyptus, pine tree, sugarcane.
Highlights
As essential components of terrestrial ecosystems, soil microbes play significant roles in decomposing organic materials and nutrient circulation
Half of its total tillable soil is used for reforestation of eucalyptus and pine trees (98% of which is for eucalyptus) and the other half is for vegetation of sugarcane
Plots plantation with stands of 10 years (P10), E20 and SL10 were more favorable to microbe growth because they had more abundant nitrogen
Summary
As essential components of terrestrial ecosystems, soil microbes play significant roles in decomposing organic materials and nutrient circulation. They are more sensitive to environment stress in their community composition and biomass and dynamic profile than other plants and animals, are commonly used as earliest indicators of many ecosystem processes The soil conditions are energetically transformed by the microbes throug changing their community composition, biomass and metabolism (Nsabimana et al, 2004). Soil properties are transformed by land management such as tillage mode, planting vegetation species and fertilization (Zheng et al, 2007; Aanderud et al, 2008).
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