The most restrictive factor in the way of economic prosperity in China’s northwest lies in the lack of water resources.To seek countermeasures against this ages-old scourge of the arid hinterland,the CAS Division of ...The most restrictive factor in the way of economic prosperity in China’s northwest lies in the lack of water resources.To seek countermeasures against this ages-old scourge of the arid hinterland,the CAS Division of Earth Sciences sponsored a workshop in Beijing on tapping water resources of Chinese northwest in March 1995 and decided to organize an expedition team of CAS members to investigate the water resources there.From August 23 to September 5,1995,the team carried out an on-the-spot survey along a 3,000-kilometre-long itiner-展开更多
Here are ＂pictures＂ of strange or even mythical animals--a grey mouse, something that looks likea dinosaur or a Chinese dragon, pile of small triangles, the sun or a star, a flag or banner. All these are in neatly a...Here are ＂pictures＂ of strange or even mythical animals--a grey mouse, something that looks likea dinosaur or a Chinese dragon, pile of small triangles, the sun or a star, a flag or banner. All these are in neatly arranged small squares, making the photocopy look like a chessboard.展开更多
Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ov...Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ovaries which can either produce one seed or one wasp. From observation on Ficus virens Ait., we showed that female flowers with outer layer of ovaries (near to the wall of syconium) had no significant difference from that with inner and interval layer of ovaries (near to the syconium cavity), in which most seeds and wasps were produced. This meant that fig tree provided the same potential resource for seed and wasps production. Observation indicated that there was usually only one foundress in syconium at female flower phase and no com- petition pollinators. Measurement of the style length of female flowers and the ovipositor of pollinators indicated that most ovaries could be reached by pollinator’s ovipositor. However, at the male flower phase, production of seeds was significantly more than that of wasps including non-pollinating wasps but there was no significant difference between seed and pollinating wasp production when without non-pollinating wasps produced. This result indicated that non-pollinating wasps competed ovaries not with seeds but with pollinating wasps for ovipositing. Bagged experiment showed that the sampling fig species was not self-sterile which was important for figs and wasps to survive bad season. Seed production in self-pollinated figs was not significantly different from total wasps in- cluding non-pollinating ones. This might be related with the weaker competition among wasps since bagged figs were not easy to reach by wasps from outside.展开更多
文摘The most restrictive factor in the way of economic prosperity in China’s northwest lies in the lack of water resources.To seek countermeasures against this ages-old scourge of the arid hinterland,the CAS Division of Earth Sciences sponsored a workshop in Beijing on tapping water resources of Chinese northwest in March 1995 and decided to organize an expedition team of CAS members to investigate the water resources there.From August 23 to September 5,1995,the team carried out an on-the-spot survey along a 3,000-kilometre-long itiner-
文摘Here are ＂pictures＂ of strange or even mythical animals--a grey mouse, something that looks likea dinosaur or a Chinese dragon, pile of small triangles, the sun or a star, a flag or banner. All these are in neatly arranged small squares, making the photocopy look like a chessboard.
基金Supported by the Knowledge Innovation Research Program,Chinese Academy of Sciences (KSCX2-SW-105)
文摘Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ovaries which can either produce one seed or one wasp. From observation on Ficus virens Ait., we showed that female flowers with outer layer of ovaries (near to the wall of syconium) had no significant difference from that with inner and interval layer of ovaries (near to the syconium cavity), in which most seeds and wasps were produced. This meant that fig tree provided the same potential resource for seed and wasps production. Observation indicated that there was usually only one foundress in syconium at female flower phase and no com- petition pollinators. Measurement of the style length of female flowers and the ovipositor of pollinators indicated that most ovaries could be reached by pollinator’s ovipositor. However, at the male flower phase, production of seeds was significantly more than that of wasps including non-pollinating wasps but there was no significant difference between seed and pollinating wasp production when without non-pollinating wasps produced. This result indicated that non-pollinating wasps competed ovaries not with seeds but with pollinating wasps for ovipositing. Bagged experiment showed that the sampling fig species was not self-sterile which was important for figs and wasps to survive bad season. Seed production in self-pollinated figs was not significantly different from total wasps in- cluding non-pollinating ones. This might be related with the weaker competition among wasps since bagged figs were not easy to reach by wasps from outside.
