【目的】探讨陆地生态系统生态化学计量学研究进展,以期推动对陆地生态系统物质循环及能量流动的进一步认识。【方法】利用Web of Science、CNKI等数据库,查阅相关文献,对陆地生态系统生态化学计量学研究进展进行综述。【结果】陆地植...【目的】探讨陆地生态系统生态化学计量学研究进展,以期推动对陆地生态系统物质循环及能量流动的进一步认识。【方法】利用Web of Science、CNKI等数据库,查阅相关文献,对陆地生态系统生态化学计量学研究进展进行综述。【结果】陆地植被生态化学计量学特征研究表明,C、N、P是生态化学计量学领域研究的主要对象,其中N和P是陆地植被生长2种最重要的限制元素;土壤中的碳氮磷比值是评价土壤质量重要指标,从全球尺度研究发现,土壤中的碳氮磷比值基本为恒值;陆地生态系统养分限制判断研究表明,N∶P比值是植物生长养分限制的敏感性指数,常被用于确定养分限制的阈值,同时N、P含量也可用于确定养分限制类型;气候、地理、土壤等因子是陆地植物生态化学计量学特征的主要影响因素。【结论】在陆地生态系统生态化学计量学研究进展中,C、N、P是学者们关注的重要因子,其比值在研究土壤质量评价、养分限制阈值等方面发挥重要作用。展开更多
The reproduction characteristics of Aprostocetus prolixus, which is a new parasitioid on Apriona germarii, were studied. It demonstrated that the female adult can generate offspring by either sex reproduction or parth...The reproduction characteristics of Aprostocetus prolixus, which is a new parasitioid on Apriona germarii, were studied. It demonstrated that the female adult can generate offspring by either sex reproduction or parthenogenesis, but all the offspring were male if they were from the mode of parthenogenesis. The sex ratio, with investigating in nature, was 2.38∶1. The environmental conditions had notable influence on sex ratio, survival ratio and fecundity. Its sex ratio increased to 3.48∶1 by feeding complementary nutrition that adding with 20% honey. The temperature has great effect on Aprostocetus prolixus in terms of system research, of which adult longevity decreased with temperature from 17.5 ℃ to 35 ℃ and its ability of reproduction increased between 25 ℃ and 30 ℃ but the acme at 27.5 ℃. Without the feeding complementary nutrition, on the other hand, the female adult will both lose the ability of fecundity at the temperature below 17.5 ℃ and over 35 ℃. With humidity increasing from 40% to 80%, its fecundity increased significantly. It also showed that there was no significant influence of temperature on fecundity between the 4 ℃ to 8 ℃ when cold storage( i.e. the matured larvae for 90 d, the adults for 10 d and the host egg for 40 d).展开更多
文摘【目的】探讨陆地生态系统生态化学计量学研究进展,以期推动对陆地生态系统物质循环及能量流动的进一步认识。【方法】利用Web of Science、CNKI等数据库,查阅相关文献,对陆地生态系统生态化学计量学研究进展进行综述。【结果】陆地植被生态化学计量学特征研究表明,C、N、P是生态化学计量学领域研究的主要对象,其中N和P是陆地植被生长2种最重要的限制元素;土壤中的碳氮磷比值是评价土壤质量重要指标,从全球尺度研究发现,土壤中的碳氮磷比值基本为恒值;陆地生态系统养分限制判断研究表明,N∶P比值是植物生长养分限制的敏感性指数,常被用于确定养分限制的阈值,同时N、P含量也可用于确定养分限制类型;气候、地理、土壤等因子是陆地植物生态化学计量学特征的主要影响因素。【结论】在陆地生态系统生态化学计量学研究进展中,C、N、P是学者们关注的重要因子,其比值在研究土壤质量评价、养分限制阈值等方面发挥重要作用。
文摘The reproduction characteristics of Aprostocetus prolixus, which is a new parasitioid on Apriona germarii, were studied. It demonstrated that the female adult can generate offspring by either sex reproduction or parthenogenesis, but all the offspring were male if they were from the mode of parthenogenesis. The sex ratio, with investigating in nature, was 2.38∶1. The environmental conditions had notable influence on sex ratio, survival ratio and fecundity. Its sex ratio increased to 3.48∶1 by feeding complementary nutrition that adding with 20% honey. The temperature has great effect on Aprostocetus prolixus in terms of system research, of which adult longevity decreased with temperature from 17.5 ℃ to 35 ℃ and its ability of reproduction increased between 25 ℃ and 30 ℃ but the acme at 27.5 ℃. Without the feeding complementary nutrition, on the other hand, the female adult will both lose the ability of fecundity at the temperature below 17.5 ℃ and over 35 ℃. With humidity increasing from 40% to 80%, its fecundity increased significantly. It also showed that there was no significant influence of temperature on fecundity between the 4 ℃ to 8 ℃ when cold storage( i.e. the matured larvae for 90 d, the adults for 10 d and the host egg for 40 d).
