Epidemiological investigation of chlamydia in yak and Tibetan sheep were conducted in Haiyan and Guinan counties, and samples were collected for laboratory detection, to understand the incidence range and damage degre...Epidemiological investigation of chlamydia in yak and Tibetan sheep were conducted in Haiyan and Guinan counties, and samples were collected for laboratory detection, to understand the incidence range and damage degree of chlamydia in yak and Tibetan sheep in Qinghai Province. The result will provide technical support for preparation of scientific prevention and control measures against Chlamydia in Qinghai Province.展开更多
Dung deposition is an important pathway of nutrient return and redistribution in alpine grasslands of the Qinghai-Tibetan Plateau.To date,information on the greenhouse gas emissions of yak dung on alpine grasslands,es...Dung deposition is an important pathway of nutrient return and redistribution in alpine grasslands of the Qinghai-Tibetan Plateau.To date,information on the greenhouse gas emissions of yak dung on alpine grasslands,especially where there are large amounts of rock fragments,is limited.Our aim,therefore,was to evaluate variations in N_2O,CH_4,and CO_2 emissions from yak dung(CCD),and compare it to dung placed on rock fragments(RCD),alpine steppe soil(CSD),and a soil and rock fragment mixture(RSD) over a 30-day incubation period.The results showed that the total N_2O emissions from treatments without soil were significantly(P < 0.05) lower than those from treatments with soil.The highest total CH_4 emissions were detected in the CSD treatment,while CH_4 losses from treatments without rock fragments were significantly(P < 0.05) greater than those with rock fragments.The total CO_2 emissions from the RSD treatment was 6.30%–12.0% lower than those in the other three treatments.The soil beneath yak dung pats elevated the globalwarming potential(GWP),while the addition of rock fragments to the soil significantly(P < 0.05) decreased the GWP by reducing emissions of the three greenhouse gases.We therefore suggest that interactions between rock fragments and alpine steppe soil are effective in decreasing yak dung greenhouse gas emissions.This finding indicates that rock fragments are an effective medium for reducing greenhouse gas emissions from dung pats,and more attention should therefore be paid to evaluate its ecological impact in future studies.These results should help guide scientific assessments of regional GHG budgets in agricultural ecosystems where the addition of livestock manure to soils with large amounts of rock fragments is common.展开更多
为从分子水平上探究西藏牦牛类群的遗传多样性、亲缘关系,本研究测定了日多牦牛、类乌齐牦牛、丁青牦牛、错那牦牛、隆子牦牛、仲巴牦牛、聂荣牦牛、申札牦牛等8个西藏牦牛类群共328头牦牛mt DNA D-loop区序列,分析其多态性,构建系统进...为从分子水平上探究西藏牦牛类群的遗传多样性、亲缘关系,本研究测定了日多牦牛、类乌齐牦牛、丁青牦牛、错那牦牛、隆子牦牛、仲巴牦牛、聂荣牦牛、申札牦牛等8个西藏牦牛类群共328头牦牛mt DNA D-loop区序列,分析其多态性,构建系统进化树。结果表明:本次测定的西藏牦牛mt DNA D-loop区序列长度为887-895 bp,共检测到135个变异位点,其中单态突变位点52个,简约信息位点83个。在328个个体中共检测出91种单倍型,平均单倍型多样性(Hd)、平均核苷酸多样性(π)分别为0.884、0.010 27,显示西藏牦牛具有丰富的遗传多样性。8个类群间平均遗传距离为0.011;日多牦牛与错那牦牛间遗传距离最小(0.006);类乌齐牦牛与隆子牦牛间遗传距离最大(0.015)。系统进化分析显示西藏牦牛可分为两大类,错那牦牛是较纯的牦牛类群,其它牦牛类群在进化过程中出现相互交流的情况。展开更多
文摘Epidemiological investigation of chlamydia in yak and Tibetan sheep were conducted in Haiyan and Guinan counties, and samples were collected for laboratory detection, to understand the incidence range and damage degree of chlamydia in yak and Tibetan sheep in Qinghai Province. The result will provide technical support for preparation of scientific prevention and control measures against Chlamydia in Qinghai Province.
基金supported by grants from the“Strategic Priority Research Program”of the Chinese Academy of Sciences(Grant No.XDB03030505)the National Natural Science Foundation of China(Grant No.41573070)the Open Fund of the State Key Laboratory of Soiland Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences(Grant No.Y412201403)
文摘Dung deposition is an important pathway of nutrient return and redistribution in alpine grasslands of the Qinghai-Tibetan Plateau.To date,information on the greenhouse gas emissions of yak dung on alpine grasslands,especially where there are large amounts of rock fragments,is limited.Our aim,therefore,was to evaluate variations in N_2O,CH_4,and CO_2 emissions from yak dung(CCD),and compare it to dung placed on rock fragments(RCD),alpine steppe soil(CSD),and a soil and rock fragment mixture(RSD) over a 30-day incubation period.The results showed that the total N_2O emissions from treatments without soil were significantly(P < 0.05) lower than those from treatments with soil.The highest total CH_4 emissions were detected in the CSD treatment,while CH_4 losses from treatments without rock fragments were significantly(P < 0.05) greater than those with rock fragments.The total CO_2 emissions from the RSD treatment was 6.30%–12.0% lower than those in the other three treatments.The soil beneath yak dung pats elevated the globalwarming potential(GWP),while the addition of rock fragments to the soil significantly(P < 0.05) decreased the GWP by reducing emissions of the three greenhouse gases.We therefore suggest that interactions between rock fragments and alpine steppe soil are effective in decreasing yak dung greenhouse gas emissions.This finding indicates that rock fragments are an effective medium for reducing greenhouse gas emissions from dung pats,and more attention should therefore be paid to evaluate its ecological impact in future studies.These results should help guide scientific assessments of regional GHG budgets in agricultural ecosystems where the addition of livestock manure to soils with large amounts of rock fragments is common.
文摘为从分子水平上探究西藏牦牛类群的遗传多样性、亲缘关系,本研究测定了日多牦牛、类乌齐牦牛、丁青牦牛、错那牦牛、隆子牦牛、仲巴牦牛、聂荣牦牛、申札牦牛等8个西藏牦牛类群共328头牦牛mt DNA D-loop区序列,分析其多态性,构建系统进化树。结果表明:本次测定的西藏牦牛mt DNA D-loop区序列长度为887-895 bp,共检测到135个变异位点,其中单态突变位点52个,简约信息位点83个。在328个个体中共检测出91种单倍型,平均单倍型多样性(Hd)、平均核苷酸多样性(π)分别为0.884、0.010 27,显示西藏牦牛具有丰富的遗传多样性。8个类群间平均遗传距离为0.011;日多牦牛与错那牦牛间遗传距离最小(0.006);类乌齐牦牛与隆子牦牛间遗传距离最大(0.015)。系统进化分析显示西藏牦牛可分为两大类,错那牦牛是较纯的牦牛类群,其它牦牛类群在进化过程中出现相互交流的情况。
