桂林七星公园阴香种群年龄结构研究     

唐文杰  徐文炘  邓华  余谦 《湖南林业科技》2015,42(2)

选择桂林七星公园中的阴香种群,采用"径级大小替代年龄大小"的方法,进行阴香种群年龄结构的研究,同时绘制了种群的年龄结构图及存活曲线。结果表明:4个样地中,样地2、样地4的阴香种群的年龄结构呈增长型,存活曲线为DeeveyⅠ型;样地1、样地3的阴香种群的年龄结构呈衰退型,存活曲线为Deevey II型。影响阴香种群年龄结构及其动态的主要因素为人为活动干扰。  相似文献   

环境因子对巢湖沉积物中NH4+释放的影响     

刘静静  汪家权  徐文炘 《安徽农业科学》2008,36(29)

[目的]为揭示环境因子对巢湖沉积物-水界面营养盐交换的影响机制。[方法]在实验室控制条件下,研究各环境因子(上覆水浓度、温度、pH值、DO条件)对巢湖沉积物湿样中NH4+释放的影响。[结果]随着温度的上升和上覆水NH4+浓度的降低,沉积物中NH4+释放量显著增加;pH值对NH4+释放的影响比较复杂;沉积物中NH4+最大释放量在厌氧条件下是好氧条件下的6倍左右。[结论]该研究为"引江济巢"工程中巢湖的环境管理提供了一定的理论依据。  相似文献   

环境因子对巢湖沉积物中NH+4释放的影响   总被引：2，自引：2，他引：2  

刘静静  汪家权  徐文炘 《农业科学与技术》2008,9(3)

[Objective] The aim of the research was to reveal the influence mechanism of sediment-water exchange of nutrients in Chaohu Lake. [Method] The effects of environmental factors (overlying water, temperature, pH and dissolved oxygen concentration) on NH 4 release in sediment from Chaohu Lake were studied under controlled laboratory conditions. [Results] With the rising of temperature and the decrease of NH 4 concentration in overlying water, NH 4 released from sediment increased significantly. pH had a great effect on NH 4 release with a complicated mechanism. The largest release amount of NH 4 under anaerobic condition was about 6 times as much as that under aerobic condition. [Conclusion] This research would provide theoretical support for environmental management of Chaohu Lake in the project of leading water from the Yangtze River to Chaohu Lake.  相似文献   

超声波辅助提取蚕沙中类黄酮的研究     

孙伟  黄江波  徐文炘 《安徽农业科学》2010,38(28):15465-15466

采用超声波辅助法提取蚕沙中的类黄酮,通过单因素试验考察乙醇浓度、提取温度、处理时间对类黄酮提取率的影响。结果表明,超声波辅助提取蚕沙中类黄酮的最佳工艺条件为：乙醇浓度30％,超声波提取时间35min,提取温度70℃,此条件下蚕沙中类黄酮的提取率为2．358％。  相似文献   

环境因子对巢湖沉积物中NH₄⁺释放的影响（英文）     

刘静静  汪家权  徐文炘 《农业科学与技术》2008,(3):153-156

[Objective] The aim of the research was to reveal the influence mechanism of sediment-water exchange of nutrients in Chaohu Lake. [Method] The effects of environmental factors （overlying water, temperature, pH and dissolved oxygen concentration） on NH₄⁺ release in sediment from Chaohu Lake were studied under controlled laboratory conditions. [Results] With the rising of temperature and the decrease of NH₄⁺ concentration in overlying water, NH₄⁺ released from sediment increased significantly. pH had a great effect on NH₄⁺ release with a complicated mechanism. The largest release amount of NH₄⁺ under anaerobic condition was about 6 times as much as that under aerobic condition. [Conclusion] This research would provide theoretical support for environmental management of Chaohu Lake in the project of leading water from the Yangtze River to Chaohu Lake.  相似文献