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| 1 | Soil microbial community structure and function responses to successive planting of Eucalyptus显示文摘Many studies have shown soil degradation after the conversion of native forests to exotic Eucalyptus plantations. However, few studies have investigated the long-term impacts of short-rotation forestry practices on soil microorganisms. The impacts of Eucalyptus successive rotations on soil microbial communities were evaluated by comparing phospholipid fatty acid(PLFA) abundances,compositions, and enzyme activities of native Pinus massoniana plantations and adjacent 1st, 2nd, 3rd, 4th generation Eucalyptus plantations. The conversion from P. massoniana to Eucalyptus plantations significantly decreased soil microbial community size and enzyme activities, and increased microbial physiological stress. However, the PLFA abundances formed '∪' shaped quadratic functions with Eucalyptus plantation age. Alternatively, physiological stress biomarkers, the ratios of monounsaturated to saturated fatty acid and Gram+ to Gram- bacteria, formed '∩' shaped quadratic functions, and the ratio of cy17:0 to 16:1ω7c decreased with plantation age. The activities of phenol oxidase, peroxidase, and acid phosphatase increased with Eucalyptus plantation age, while the cellobiohydrolase activity formed '∪' shaped quadratic functions. Soil N:P, alkaline hydrolytic nitrogen, soil organic carbon, and understory cover largely explained the variation in PLFA profiles while soil N:P, alkaline hydrolytic nitrogen, and understory cover explained most of the variability in enzyme activity. In conclusion, soil microbial structure and function under Eucalyptus plantations were strongly impacted by plantation age. Most of the changes could be explained by altered soil resource availability and understory cover associated with successive planting of Eucalyptus. Our results highlight the importance of plantation age for assessing the impacts of plantation conversion as well as the importance of reducing disturbance for plantation management. | Falin Chen Hua Zheng Kai Zhang Zhiyun Ouyang Huailin Li Bing Wu Qian Shi | 2013 | Journal of Environmental Sciences2013，25，10： | 12 |
| 2 | Variation of quantum yield curves of GaA s photocathodes under illumination显示文摘 | Zou Jijun Chang Benkang Chen Huailin | 2007 | Journal of Applied Physics2007，101，03： | 1 |
| 3 | 显示文摘 | Chen Li Liao Huailin Li Yang | 2007 | Solid-State Electronics2007，51，： | 1 |
| 4 | Wind measurements with 355-nm molecular Doppler lidar显示文摘 | Bruce M G Chen Huailin Li S X | 2000 | Optics Letters2000，25，17： | 1 |
| 5 | Wind measurements with 355-nm molecular Doppler lidar 显示文摘 | Gentry Bruce M Chen Huailin Li Steven X | 2000 | Optics Letters2000，25，12： | 1 |
| 6 | Changes in soil microbial community structure and metabolic activity following conversion from native Pinus massoniana plantations to exotic Eucalyptus plantations显示文摘 | Falin Chen Hua Zheng Kai Zhang Zhiyun Ouyang Jun Lan Huailin Li Qian Shi | 2012 | Forest Ecology and Management2012，，： | 1 |
| 7 | A 65 mW fully integrated UHF-band CMMB tuner in 65 nm CMOS process显示文摘A low power fully integrated digital TV tuner chip for China Mobile Multimedia Broadcasting(CMMB) application is presented.Based on direction conversion architecture,analog 8th-order filter/gain stages utilizing high power efficient operation-amplifiers and a ΣΔ fractional-N phase locked loop(PLL) with one voltage controlled oscillator(VCO) covering 4.8—7.2 GHz is proposed for low power and small chip area.The tuner is implemented in 65 nm CMOS process with low noise amplifier(LNA) matching network and phase locked loop(PLL) filter integrated on chip,occupying a chip area of 4.83 mm2.The measured noise figure(NF) is less than 3.2 dB over CMMB UHF band(470—798 MHz).A total power consumption of 65 mW(54 mA from 1.2 V supply) is achieved. | LIU JunHua LI Chen CHEN Long SHI CongYin WENG XuanKai WANG YiXiao WANG JiaYi LIAO Yu YE Le LIAO HuaiLin HUANG Ru | 2013 | Science China(Information Sciences)2013，56，1： | 0 |
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