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| Effects of pig farm waste, phosphate-solubilizing bacteria, and earthworms on enzymes related to soil C cycling in arid hillside land |
| Received:May 11, 2017 |
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| KeyWord:pig manure;earthworm;phosphate-solubilizing bacteria;soil enzyme |
| Author Name | Affiliation | E-mail | | CHENG Xiong | The College of Natural Resources and Environment of South China Agricultural University, Guangzhou 510642, China
The New Countryside Development Institute of South China Agricultural University, Guangzhou 510642, China | | | WANG Li-ying | The College of Natural Resources and Environment of South China Agricultural University, Guangzhou 510642, China
Preparation Office of Southern China Agricultural Museum of South China Agricultural University, Guangzhou 510642, China | | | LI Wen-yan | The College of Natural Resources and Environment of South China Agricultural University, Guangzhou 510642, China | | | ZHANG Hai-chun | The College of Natural Resources and Environment of South China Agricultural University, Guangzhou 510642, China | | | LI Yong-tao | The College of Natural Resources and Environment of South China Agricultural University, Guangzhou 510642, China | | | ZHANG Yu-long | The College of Natural Resources and Environment of South China Agricultural University, Guangzhou 510642, China | yulongzhang@scau.edu.cn |
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| Abstract: |
| Livestock wastes from intensive agricultural production are extensively utilized as organic fertilizers in soils. The degradation of organic wastes and the release of nutrients are closely associated with soil microbial activity. Earthworms and bacteria in soil may accelerate the transformation of organic matter via digestion and assimilation. Soil microbial biomass and enzyme activities are important indicators of soil quality. To elucidate the effects of pig manure, biogas slurry, and functional organisms on the microbial biomass carbon (MBC) and the activities of enzymes related to C cycling, a field experiment was conducted with six treatments of control (CK), pig manure (Pm), pig manure + slurry[ (Pm+S)/T], manure + slurry + earthworms (Te), manure + slurry + phosphate-solubilizing bacteria (Tb), and manure + slurry + earthworms + bacteria[T (e+b)]. The former three treatments were to investigate the roles of the exogenous wastes on the activities of enzymes related to C cycling. The latter three were to further evaluate the collaborative effects of functional organisms. Compared with those in CK, the activities of amylase and β-glucosidase increased by 10.0%~50.53% and 30.2%~55.9%, respectively, in Pm. Compared with those in Pm+S, the contents of MBC, invertase, amylase, and β-glucosidase activity by 58.0%~124%, 95.2%~216%, 22.3%~66.8%, and 65.3%~118%, respectively, in T (e+b). The results indicated that pig waste had a significant effect on the activities of amylase and β-glucosidase in the arid-slope soil. Furthermore, the application of earthworms and phosphate-solubilizing bacteria stimulated the amylase and β-glucosidase activities. Meanwhile, soil MBC and invertase activity were also enhanced in T (e+b), suggesting a synergistic effect of earthworms and phosphate-solubilizing bacteria on these two soil properties. In contrast, the addition of earthworms or phosphate-solubilizing bacteria alone did not have a significant effect on soil enzyme activities. These results suggest that the combined addition of earthworms and phosphate-solubilizing bacteria was an efficient strategy for stimulating the transformation of manure organic matter and the cycling of nutrients in arid hillside soils. |
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