Water quality, size, connectivity and other physical properties of hydrological systems might have different functions in the formation and maintenance of biodiversity, but this remains mostly unclear due to the lack ...Water quality, size, connectivity and other physical properties of hydrological systems might have different functions in the formation and maintenance of biodiversity, but this remains mostly unclear due to the lack of undisturbed sites for experimental modelling. Alpine freshwater habitats such as micro-waterbodies(MWB) represent a kind of natural system suitable for biodiversity research. In order to assess potential linkages between environmental factors, connectivity of MWBs and aquatic species richness, we conducted a pilot study in two separated MWB systems located in Gaoligong Mountain, northwest Yunnan province, China. A total of 27 MWBs have been analyzed, including 22 connected and 5 isolated bodies. 13 conventional environmental factors were tested while all kinds of aquatic macro-organisms were collected and classified. Results showed a high environmental heterogeneity among MWBs and significant differences between the two systems but only a few environmental variables such as the depth of soil bottom, total Nitrogen and altitude were related to species richness and the formation of the community structure. As a benefit from the high environmental heterogeneity, the cascaded MWB systems provided divergent habitats able to support species richness at a higher level than the same number of randomly selected MWBs. This finding supports the idea that habitat connectivity matters also in extremely small aquatic ecosystems. Moreover, although still a preliminary result, a polarization effect within connected chains where edge MWBs host higher taxa and endemic taxa richness as well as larger populations, was detectable. This study gives interesting insights on the spatial processes driving community structure and a new prospective for biodiversity conservation. Since alpine MWBs have significant effects on the maintenance of watershed biodiversity, further research on such small and crucial ecosystems is encouraged.展开更多
铜炉房金矿床大地构造位置位于松潘-甘孜造山带巴颜喀拉-马尔康逆冲-滑脱叠置岩片内,矿区主要出露二叠系三道桥组、大石包组及泥盆系危关组上段地层。矿区构造主要为铜炉房穹窿、顺层韧性剪切带及陡倾压扭性断裂带,矿体主要受近东西向...铜炉房金矿床大地构造位置位于松潘-甘孜造山带巴颜喀拉-马尔康逆冲-滑脱叠置岩片内,矿区主要出露二叠系三道桥组、大石包组及泥盆系危关组上段地层。矿区构造主要为铜炉房穹窿、顺层韧性剪切带及陡倾压扭性断裂带,矿体主要受近东西向陡倾压扭性断裂带控制。已发现7个矿体和1个矿化体。矿床成因类型属于变质热液型金矿床。孔雀石化-褐铁矿化硫化物石英脉、黄铁矿化带碎裂岩带、泥盆系危关组上段地层、蚀变辉长岩等基性-超基性岩脉、土壤Au Cu Pb Zn组合异常、近东西向陡立脆性断裂带及民采老硐是主要的找矿标志。展开更多
对受人类活动强烈影响、几乎不存在常规参照点的城市河流开展生态评价存在很多困难。研究基于2018年春季深圳市茅洲河水系调查数据,用水体理化指标聚类法确定参照组、受损组样点,从底栖动物多样性、群落结构、耐污能力、功能摄食类群等...对受人类活动强烈影响、几乎不存在常规参照点的城市河流开展生态评价存在很多困难。研究基于2018年春季深圳市茅洲河水系调查数据,用水体理化指标聚类法确定参照组、受损组样点,从底栖动物多样性、群落结构、耐污能力、功能摄食类群等角度确定候选参数,筛选出核心参数构建底栖生物完整性指数(Benthic index of biotic integrity,B-IBI)评价其生态状况。调查共采集到大型底栖动物62个分类单元,虽然茅洲河水环境质量整体较差,聚类分析仍然能将水质相对较好和较差的样点分成不同组。大型底栖动物以颤蚓和摇蚊等耐污种为主,大型底栖动物总分类单元数和集食者分类单元数对水环境变化较敏感。用这2个参数构建的B-IBI对各点的生态状况进行评价表明:12个位于干、支流上游或水库出水口附近的样点生态状况达到“好”等级;7个位于干流下游和汇入干流下游河段的支流样点为“差”,其他15个样点为“中”。NH_(3)^(-)N、TN、PO_(4)^(-)P和COD对B-IBI有显著负影响,DO浓度对B-IBI有显著正影响。建议参照“好”等级样点的生态状况确定茅洲河现阶段修复目标,并以水质提升作为当前首要修复任务。展开更多
打印液开发是黏结剂喷射型3D打印制剂的重点和难点,直接决定了打印产品的质量。本研究运用质量源于设计理念,采用3个中心点的23全因子实验设计(Design of Experiment, DoE),对左乙拉西坦3D打印分散片的打印液组成进行优化。使用40%(v/v...打印液开发是黏结剂喷射型3D打印制剂的重点和难点,直接决定了打印产品的质量。本研究运用质量源于设计理念,采用3个中心点的23全因子实验设计(Design of Experiment, DoE),对左乙拉西坦3D打印分散片的打印液组成进行优化。使用40%(v/v)异丙醇水溶液作为基础溶剂,以聚乙烯吡咯烷酮K30、甘油及聚山梨酯20用量作为自变量,分析其对打印片剂重量差异、硬度、脆碎度及分散均匀性等关键质量属性的影响。通过DoE模型分析获得了打印液处方的设计空间,并通过响应优化器获得了最优的打印液处方:含有0.1%(w/w)聚乙烯吡咯烷酮K30和4.0%(w/w)甘油的异丙醇水溶液。对打印液的喷射机制和润湿性进行分析,并制备和表征了不同规格的3D打印个性化制剂,验证了打印液处方的合理性,为黏结剂喷射型3D打印制剂中打印液的研究提供了参考和依据。展开更多
基金funded by the National Natural Science Foundation Program of P.R.China[31760126,U1602262,31960255,31472021]supported by the Second Tibetan Plateau Scientific Expedition and Research Program(STEP),Grant No.SQ2019QZKK2002+1 种基金the provincial innovation team of biodiversity conservation and utility of the three parallel rivers region from Dali Universitythe“Key Laboratory of Yunnan State Education Department on Er’hai Lake Basin Protection and the Sustainable Development Research”。
文摘Water quality, size, connectivity and other physical properties of hydrological systems might have different functions in the formation and maintenance of biodiversity, but this remains mostly unclear due to the lack of undisturbed sites for experimental modelling. Alpine freshwater habitats such as micro-waterbodies(MWB) represent a kind of natural system suitable for biodiversity research. In order to assess potential linkages between environmental factors, connectivity of MWBs and aquatic species richness, we conducted a pilot study in two separated MWB systems located in Gaoligong Mountain, northwest Yunnan province, China. A total of 27 MWBs have been analyzed, including 22 connected and 5 isolated bodies. 13 conventional environmental factors were tested while all kinds of aquatic macro-organisms were collected and classified. Results showed a high environmental heterogeneity among MWBs and significant differences between the two systems but only a few environmental variables such as the depth of soil bottom, total Nitrogen and altitude were related to species richness and the formation of the community structure. As a benefit from the high environmental heterogeneity, the cascaded MWB systems provided divergent habitats able to support species richness at a higher level than the same number of randomly selected MWBs. This finding supports the idea that habitat connectivity matters also in extremely small aquatic ecosystems. Moreover, although still a preliminary result, a polarization effect within connected chains where edge MWBs host higher taxa and endemic taxa richness as well as larger populations, was detectable. This study gives interesting insights on the spatial processes driving community structure and a new prospective for biodiversity conservation. Since alpine MWBs have significant effects on the maintenance of watershed biodiversity, further research on such small and crucial ecosystems is encouraged.
文摘铜炉房金矿床大地构造位置位于松潘-甘孜造山带巴颜喀拉-马尔康逆冲-滑脱叠置岩片内,矿区主要出露二叠系三道桥组、大石包组及泥盆系危关组上段地层。矿区构造主要为铜炉房穹窿、顺层韧性剪切带及陡倾压扭性断裂带,矿体主要受近东西向陡倾压扭性断裂带控制。已发现7个矿体和1个矿化体。矿床成因类型属于变质热液型金矿床。孔雀石化-褐铁矿化硫化物石英脉、黄铁矿化带碎裂岩带、泥盆系危关组上段地层、蚀变辉长岩等基性-超基性岩脉、土壤Au Cu Pb Zn组合异常、近东西向陡立脆性断裂带及民采老硐是主要的找矿标志。
文摘对受人类活动强烈影响、几乎不存在常规参照点的城市河流开展生态评价存在很多困难。研究基于2018年春季深圳市茅洲河水系调查数据,用水体理化指标聚类法确定参照组、受损组样点,从底栖动物多样性、群落结构、耐污能力、功能摄食类群等角度确定候选参数,筛选出核心参数构建底栖生物完整性指数(Benthic index of biotic integrity,B-IBI)评价其生态状况。调查共采集到大型底栖动物62个分类单元,虽然茅洲河水环境质量整体较差,聚类分析仍然能将水质相对较好和较差的样点分成不同组。大型底栖动物以颤蚓和摇蚊等耐污种为主,大型底栖动物总分类单元数和集食者分类单元数对水环境变化较敏感。用这2个参数构建的B-IBI对各点的生态状况进行评价表明:12个位于干、支流上游或水库出水口附近的样点生态状况达到“好”等级;7个位于干流下游和汇入干流下游河段的支流样点为“差”,其他15个样点为“中”。NH_(3)^(-)N、TN、PO_(4)^(-)P和COD对B-IBI有显著负影响,DO浓度对B-IBI有显著正影响。建议参照“好”等级样点的生态状况确定茅洲河现阶段修复目标,并以水质提升作为当前首要修复任务。
文摘打印液开发是黏结剂喷射型3D打印制剂的重点和难点,直接决定了打印产品的质量。本研究运用质量源于设计理念,采用3个中心点的23全因子实验设计(Design of Experiment, DoE),对左乙拉西坦3D打印分散片的打印液组成进行优化。使用40%(v/v)异丙醇水溶液作为基础溶剂,以聚乙烯吡咯烷酮K30、甘油及聚山梨酯20用量作为自变量,分析其对打印片剂重量差异、硬度、脆碎度及分散均匀性等关键质量属性的影响。通过DoE模型分析获得了打印液处方的设计空间,并通过响应优化器获得了最优的打印液处方:含有0.1%(w/w)聚乙烯吡咯烷酮K30和4.0%(w/w)甘油的异丙醇水溶液。对打印液的喷射机制和润湿性进行分析,并制备和表征了不同规格的3D打印个性化制剂,验证了打印液处方的合理性,为黏结剂喷射型3D打印制剂中打印液的研究提供了参考和依据。
