Subjects: Biology >> Botany submitted time 2022-12-01 Cooperative journals: 《广西植物》
Abstract：
In the processes of plants response to UV-B, the UV-B photoreceptor UVR8 (UV Resistance Locus 8) plays an important role in the regulation of photomorphogenesis, growth and metabolism of plants. To investigate the UV-B photoreceptors of Apocynum plant, this study is conducted to screen and bioinformatically analyze the UV-B photoreceptors UVR8 by the whole genome data of Apocynum venetum and A. cannabinum, and also to analyze the UVR8 gene expression pattern under UV-B stress treatment using transcriptome data. The results were as follows: (1) There were 6 UVR8 genes in A. venetum, and 5 UVR8 genes in A. cannabinum. The former was distributed on chromosomes 1, 7, 9 and 11, and the latter on chromosomes 1, 8 and 9. (2) UVR8 proteins were all hydrophilic unstable proteins, localized in the nucleus, without transmembrane structure or signal peptides. The secondary structure consists mainly of extended strand, random coil, alpha helix and beta turn. The tertiary structures of AvUVR8b and AcUVR8a were most similar to that of Arabidopsis and were most closely related to Coffea arabica (CaUVR8) and C. eugenioides (CeUVR8). The gene and protein structures of Apocynum venetum AvUVR8b and A. cannabinum AcUVR8a were highly similar to those of AtUVR8. (3) The expression levels of AvUVR8b and AcUVR8a was up-regulated when the two Apocynum plants were treated with a certain dose of UV-B (17.52 KJ穖-2穌-1). It is speculated that in response to UV-B, the AvUVR8b in A. venetum and the AcUVR8a in A. cannabinum play a major role, respectively. (4) The analysis of cis-acting elements showed that the expression of UVR8 was regulated by light, temperature, moisture, oxygen and hormones. This study will lay a foundation for further research on the gene function of UVR8 in Apocynum, and provide clues to analyze the molecular mechanism of UV-B adaptation in the Apocynum.
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-11 Cooperative journals: 《干旱区研究》
Abstract：在天津市2000—2016年碳排放测算的基础上，运用LMDI模型分析天津市碳排放影响因素。结果表明：经济规模和能源强度对天津市碳排放影响较大，二者对碳排放影响分别表现为促进和抑制作用；通过将经济变量分为高、中、低3种情景，减排变量分为中减排和强减排2种情景，组合得到高增长强减排、中增长强减排等6种发展情景。基于STIRPAT扩展模型，预测6种组合情景下天津市碳排放变化趋势。结果显示，中增长强减排情景模式在保证经济发展的同时，较其余几种模式碳排放峰值及其年份均有优化，是天津市最佳发展模式。
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-10 Cooperative journals: 《干旱区研究》
Abstract：研究选取内蒙古苏尼特右旗，通过分析2015年5月至2016年12月日降水数据和同期不同深度土壤（0~10 cm，10~20 cm，20~30 cm，30~40 cm和40~50 cm）含水量日连续观测数据，探讨降水事件对荒漠草原土壤含水量的影响。结果表明:① 降水量对表层土壤（0~10 cm，10~20 cm）含水量影响最剧烈，且2层土壤含水量与降水量存在显著的正相关关系，其余3层土壤含水量对降水事件响应不显著。② 0~10 cm、10~20 cm土壤层的最小有效降水量分别为6.4 mm和8.33 mm。③ 结合最小有效降水量进一步推导0~10 cm及10~20 cm土壤层的有效降水转化率发现，0~10 cm土壤最大有效降水转化率可达到95%，但是大部分都是在70%左右；10~20 cm最大有效降水转化率可达90%，但是大部分都是在50%左右。
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2018-11-08 Cooperative journals: 《干旱区研究》
Abstract： 以内蒙古典型草原多年围封草场的丘坡为研究区，沿坡面均匀设置6条样线，共计96个样方，探究坡位对典型草原群落物种多样性和功能多样性的影响，并讨论环境因素和种间竞争在群落两种维度多样性格局中的作用。结果表明：○1物种多样性和功能多样性沿坡位变化的趋势一致。随着坡位上升，群落的物种丰富度和功能丰富度均单调递减，物种均匀度、物种优势度和功能均匀度、功能离散度均先增加后降低。○2从整个坡位来看，土壤全磷含量是影响群落物种丰富度的主要因子，并与功能丰富度显著相关；种间竞争是影响物种均匀度、物种优势度和功能离散度的重要因素，并与功能均匀度显著相关。○3群落物种多样性及功能多样性在上坡位主要受到种间竞争与环境的共同作用，在下坡位则主要受到种间竞争的影响。因此，在探究群落生物多样性格局变化的过程中，要综合考虑环境因素和生物因素的共同作用。
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