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| 1 | Soil organic carbon and nitrogen content of density fractions and effect of meadow degradation to soil carbon and nitrogen of fractions in alpine Kobresia meadow显示文摘This research was conducted on the non-disturbed native alpine Kobresia meadow(YF) and the severely degraded meadow(SDL) of Dari County of Qinghai Province.By a density fractionation approach,each soil sample was divided into two fractions:light fraction(LF) and heavy fraction(HF).The obtained fractions were analyzed for organic carbon(OC) and nitrogen(N) concentrations.The results showed:(1) the OC concentration in HF and LF was 3.84% and 28.63% respectively while the nitrogen concentration in HF and LF was 0.362% and 1.192% respectively in 0-10 cm depth.C:N ratio was 10.6 in HF and 23.8 in LF respectively.(2) As far as the ratio of OC in given fraction to that in gross sample was concerned,dominance of OC in HF was obvious in the whole soil profile.OC in HF increased from 78.95% to 90.33%,while OC in LF decreased from 21.05% to 9.68% with depths.(3) Soil total OC amounted to 47.47 in YF while 17.63 g.kg-1 in SDL,in which the OC content in HF decreased from 37.31 to 16.01 g.kg-1 while OC content in LF decreased from 10.01 to 1.62 g.kg-1.In other words,results of OC and N content show meadow degradation led to the loss of 57% OC in HF and 84% OC in LF from originally native ecosystem on alpine meadow.In addition,meadow degradation led to the loss of 43% N in HF and 79% N in LF from originally native ecosystem on alpine meadow.(4) The main reason for loss of C and N in LF during meadow degradation was not attributed to the decrease of OC and N concentration in LF and LF,but to the decrease in LF dry weight.Loss of N was far lower than loss of C in HF.This may suggest that there is difference in protection mode of C and N in HF. | WANG WenYing WANG QiJi LU ZiYu | 2009 | Science China Earth Sciences2009，52，5： | 10 |
| 2 | Changes in plant species composition and diversity of alpine Kobresia (Kobresia pygmaea) steppe meadow at different stages of desertification in the North Tibetan plateau显示文摘The impacts of desertification on the vegetation composition, structure, and species diversity of alpine Kobresia steppe meadow were evaluated in an area of severe desertification in Anduo County, Tibet Autonomous Region, northern China. We investigated and analyzed the floristic features of communities at four different stages of desertification (slight desertification [SLD], moderate desertification [MD], severe desertification [SD], and very severe desertification [VSD]). The composition and structure of the alpine Kobresia steppe meadow at the SLD site differed significantly from that at the MD, SD, and VSD sites. Species that were more drought resistant and inedible by livestock were the dominant species at the SD site. No plants were found in the shifting dunes of the VSD site. Species diversity also decreased with increasing desertification. The SLD site had the largest mean number of species and individuals and the largest richness index; the MD grassland had the largest Shannon-Wiener index and evenness index, but the smallest Simpson's index. The vegetation cover declined from 91.8% to 34.8% as desertification increased from SLD to SD, and reached 0% in VSD areas with shifting dunes. | XingHu Wei 1*, Ping Yang 2, Sen Li 1, YuXiang Dong 3, ChunLai Zhang 41. Department of Resources and Environmental of Foshan University, Foshan, Guangdong 528000, China.2. Resources and Environmental Bureau , Chinese Academy of Science, Lanzhou, Gansu 730000, China. 3. Department of Geography of Zhongshan University, Guangzhou, Guangdong 510275, China. 4. Beijing Normal University, Beijing 100875, China. | 2009 | Research in Cold and Arid Regions2009，1，1： | 3 |
| 3 | 基于RNA-seq的西藏嵩草转录组分析显示文摘嵩草属植物是青藏高原及其周边地区高寒草甸的建群种,分蘖能力强、根系发达,耐寒,是优良的牧草资源。目前对该类植物转录组情况的研究相对不足。该文采用Illumina HiSeq 2500高通量测序技术,对西藏嵩草(Kobresia tibetica)茎、叶、花及果实的混合样进行转录组分析。经拼接组装共获得63 837个Unigene,序列平均长度890.1bp,N50为1 342bp。将Unigene序列与5个主要的公共数据库(NR,Swiss-Prot,KEGG,GO,KOG)进行比对(Evalue<1e-5),共有40 705条Unigene获得了基因注释,占总Unigene的63.76%。通过KEGG pathways分析,共有10 043Unigene参与了274个代谢通路,获得了西藏嵩草分蘖和抗寒相关Unigene 179个。在15 044条Unigene中共搜索到5 310个SSR位点,其中二核苷酸和三核苷酸的重复类型占所有SSR位点的94.63%。这些数据为嵩草相关基因的发掘和SSR分子标记开发提供了重要依据。 | 宁宇 董树斌 武高洁 王义飞 马骅 索朗夺尔基 | 2017 | 林业科技通讯2017，，7： | 2 |
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