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| 1 | Effect of vegetation type, wetting intensity, and nitrogen supply on external carbon stimulated heterotrophic respiration and microbial biomass carbon in forest soils显示文摘By using packed soil-core incubation experiments,we have studied stimulating effects of addition of external carbon(C)(glucose,6.4 g Cm^(-2))on heterotrophic respiration and microbial biomass C of a mature broadleaf and Korean pine mixed forest(BKPF)and an adjacent white birch forest(WBF)soil under different wetting intensities(55%and 80%WFPS,water-filled pore space)and nitrogen(N)supply(NH_4C1 and KNO_3,4.5 g Nm^(-2))conditions.The results showed that for the control,the cumulative carbon dioxide(CO_2)flux from WBF soil during the 15-day incubation ranged from 5.44 to 5.82 g CO_2-Cm^(-2),which was significantly larger than that from BKPF soil(2.86 to 3.36 g CO_2-Cm^(-2)).With increasing wetting intensity,the cumulative CO_2 flux from the control was decreased for the WBF soil,whereas an increase in the CO_2 flux was observed in the BKPF soil(P<0.05).The addition of NH_4C1 or KNO_3 alone significantly reduced the cumulative CO_2 fluxes by 9.2%-21.6%from the two soils,especially from WBF soil at low wetting intensity.The addition of glucose alone significantly increased soil heterotrophic respiration,microbial biomass C(MBC),and microbial metabolic quotient.The glucose-induced cumulative CO_2 fluxes and soil MBC during the incubation ranged from 8.7 to 11.7 g CO_2-Cm^(-2)and from 7.4 to 23.9 g Cm^(-2),which are larger than the dose of added C.Hence,the addition of external carbon can increase the decomposition of soil native organic C.The glucose-induced average and maximum rates of CO_2 fluxes during the incubation were significantly influenced by wetting intensity(WI)and vegetation type(VT),and by WI×VT,NH_4Cl×VT and WI×VT×NH_4Cl(P<0.05).The addition of NH_4C1,instead of KNO_3 significantly decreased the glucose-induced MBC of WBF soil(P<0.05),whereas adding NH_4C1 and KNO_3 both significantly increased the glucose-induced MBC of BKPF soil at high moisture(P<0.05).According to the differences in soil labile C pools,MBC and CO_2 fluxes in the presence and absence of glucose,it can be concluded that the stimulating effects of glucose on soil heterotrophic respiration and MBC under temperate forests were dependent on vegetation type,soil moisture,and amount and type of the N added. | WU HaoHao XU XingKai DUAN CunTao LI TuanSheng CHENG WeiGuo | 2015 | Science China Earth Sciences2015，58，8： | 6 |
| 2 | Effect of Songlingxuemaikang(松龄血脉康) on mild essential hypertension in patients: a randomized parallel-controlled study显示文摘OBJECTIVE:To evaluate the effect of songlingxuemaikang(松龄血脉康,SLXMK)on mild essential hypertension in patients in terms of endothelial function.METHODS:We enrolled 90 patients with mild essential hypertension in Xuanwu Hospital from January 2016 to December 2016.To evaluate the effects of SLXMK,the 90 patients were randomly assigned at a 2∶1 ratio into 2 groups:the SLXMK group(500 mg per capsule,4500 mg/d,n=60)and the losartan potassium group(50 mg per table,50 mg/d,n=30).The total study period was 12 weeks,and the changes of blood pressure,laboratory test and endothelium function were compared between two groups.RESULTS:After 12 weeks of treatment with SLXMK,blood pressure(BP)and plasma lipid levels significantly improved(P<0.05).Meanwhile,the reactive hyperemia index(RHI)increased in the SLXMK group(P<0.05).The results of multivariate logisticregression analyses examining the association of selected variables with showed that high level of oxidized low density lipoprotein(ox-LDL)was positively associated with endothelial dysfunction.CONCLUSION:SLXMK not only effectively decreased BP and plasma lipid levels,but also reduced ox-LDL and RHI in patients with mild essential hypertension.And SLXMK might improve endothelial function through decreasing the circulating ox-LDL. | ZHU Guohua SUN Xipeng DING Cuntao ZHAO Huan LI Jing HUA Qi | 2021 | Journal of Traditional Chinese Medicine2021，41，5： | 2 |
| 3 | Effect of intensity and duration of freezing on soil microbial biomass,extractable C and N pools,and N2O and CO2 emissions from forest soils in cold temperate region显示文摘Freezing can increase the emissions of carbon dioxide(CO_2) and nitrous oxide(N_2O) and the release of labile carbon(C) and nitrogen(N) pools into the soil. However, there is limited knowledge about how both emissions respond differently to soil freezing and their relationships to soil properties. We evaluated the effect of intensity and duration of freezing on the emissions of CO_2 and N_2 O, net N mineralization, microbial biomass, and extractable C and N pools in soils from a mature broadleaf and Korean pine mixed forest and an adjacent secondary white birch forest in northeastern China. These soils had different contents of microbial biomass and bulk density. Intact soil cores of 0–5 cm and 5–10 cm depth sampled from the two temperate forest floors were subjected to -8, -18, and -80°C freezing treatments for a short(10 d) and long(145 d) duration, and then respectively incubated at 10°C for 21 d. Soil cores, incubated at 10°C for 21 d without a pretreatment of freezing, served as control. Emissions of N_2 O and CO_2 after thaw varied with forest type, soil depth, and freezing treatment. The difference could be induced by the soil water-filled pore space(WFPS) during incubation and availability of substrates for N_2 O and CO_2 production, which are released by freezing. A maximum N_2 O emission following thawing of frozen soils was observed at approximately 80% WFPS, whereas CO_2 emission from soils after thaw significantly increased with increasing WFPS. The soil dissolved organic C just after freezing treatment and CO_2 emission increased with increase of freezing duration, which paralleled with a decrease in soil microbial biomass C. The cumulative net N mineralization and net ammonification after freezing treatment as well as N_2 O emission were significantly affected by freezing temperature. The N_2 O emission was negatively correlated to soil p H and bulk density, but positively correlated to soil K_2SO_4-extractable NO_3^--N content and net ammonification. The CO_2 emission was positively correlated to the cumulative net N mineralization and net ammonification. From the above results, it can be reasonably concluded that for a wide range of freezing temperature and freezing duration, N_2 O and CO_2 emissions after thaw were associated mainly with the changes in soil net N mineralization and the availability of substrate liberated by freezing as well as other soil properties that influence porosity. | XU XingKai DUAN CunTao WU HaoHao LI TuanSheng CHENG WeiGuo | 2016 | Science China Earth Sciences2016，59，1： | 2 |
| 4 | Hybrid total arch repair without deep hypothermic circulatory arrest for acute type A aortic dissection (R1)显示文摘 | Qian Chang Chuan Tian Yizhen Wei Xiangyang Qian Xiaogang Sun Cuntao Yu | 2012 | The Journal of Thoracic and Cardiovascular Surgery2012，，： | 1 |
| 5 | Comparison of Incisions and Outcomes for Closure of Ventricular Septal Defects显示文摘 | Jianrong Li Yinglong Liu Cuntao Yu Bin Cui Ming Du | 2008 | The Annals of Thoracic Surgery2008，，1： | 1 |
| 6 | Mid-term results of hybrid arch repair for DeBakey type I aortic dissection显示文摘To the Editor:Total aortic arch replacement(TAR)is a surgical procedure associated with significant perioperative risks,leading to a higher rate of mortality and neurologic complications.Ascending aortic or hemiarch replacement is associated with less complicated procedures,which can be used to effectively resect the proximal intimal tear and potentially improve the survival rates in these patients.[1]Hybrid aortic repair,combining openchest surgery and stent placement has been effectively used in patients with an aortic arch aneurysm.[2]Although a hybrid technique is often followed,only a limited number of studies with a small number of cases have investigated the application of this procedure for the treatment of type I aortic dissection.[1,2]This study aimed to evaluate the early and mid-term safety and efficacy of the hybrid technique in this cohort by analyzing a large sample size. | Liang Zhang Zhan Peng Cuntao Yu Xiubin Yang Juntao Qiu De Wang | 2022 | Chinese Medical Journal2022，，4： | 0 |
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