[Emergy analysis of four typical planting modes in Karst faulted basins of Yunnan Province, China.] / 云南断陷盆地喀斯特4ç§å ¸åž‹ç§æ¤æ¨¡å¼çš„èƒ½å€¼åˆ†æž.

Accurate evaluation of typical cropping patterns in faulted basins can provide scientific guidance for planting in the area. The planting modes of marigold, pomegranate, pomegranate+grass+sheep in Mengzi City of Yunnan Province were compared with the traditional corn planting mode. The ecological benefits and economy benefits of these rocky desertification control modes were analyzed by the method of emergy analysis. The environmental loading ratio (ELR) and emergy restoration ratio (ERR) were 13.80 and 0.41 in pomegranate planting mode, respectively, while 0.30 and -2.87 in marigold planting mode. The ecological benefits in pomegranate planting mode and marigold planting mode were lower than that of corn, and ELR and ERR were 1.30 and 4.64, respectively. However, the economic pure benefit per unit (EPBU) in pomegranate planting mode and marigold planting mode were 3.05 and 59.98 times of that in corn mode, respectively, indicating that pomegranate planting mode and marigold panting mode had higher economic benefits than that of corn. Pomegranate+pasture+sheep mode had the highest ecological and economic benefits among the four modes. The plus of forage+livestock subsystem to pomegranate planting mode had high eco-efficiency (ELR of 4.95, ERR of 0.63) and economic benefit (EPBU of 71.38 times than that of corn). Thus, we recommend that the local government should increase technical support for marigold planting mode and pomegranate+pasture+sheep mode, which including optimizing structures of fertilizer input, and crop cultivation and livestock breeding processes. Meanwhile, government could establish short-term labor markets for picking of fruits and flowers.

[Ultrastructure of Ericerus pela (Chavannes) nymph mouthparts and ecological adaptations].

The ultrastructure of nymph mouthparts of the Chinese white wax scale (CWWS), Ericerus pela, consists internally of the crumena, tentorium, the stylet bundle, comprised of two mandibular stylets and two maxillary stylets, and the external clypeolabral shield, labium and sensilla. The mouthpart morphology and structures of the female nymphs are similar to the male. The mouthparts of CWWS have significantly different features in comparison to aphids and other coccids. First, the mouthparts of CWWS have a crumena and a developed tentorium. Second, the labrum is highly degraded and the labium is short and one-segmented. Third, the maxillary stylets have two 'T' type locks. Lastly, the hairs of the mouthpart are sparse and the sensilla are simple. As the labrum and labium of CWWS displayed a high degree of degradation and the tentorium was found to be highly developed, the stretching of the stylet bundle was considered to be controlled by the tentorium and crumena together. Furthermore, the degraded sensilla may be related to a specialization of feeding behavior. There were no significant differences in the length and diameter of the stylet bundles between the female and male. However, the length and diameter of the stylet bundles were significantly different between the first instar nymphs and the second instar nymphs. The first instar nymphs had stylet fascicles that were shorter and soft and initially lived on the leaves of the host trees, presumably because the leaves were thinner and they were able to pierce the leaves while the stylet bundle was relatively soft. However, the second instar nymphs had stylet bundles that were relatively hard. After the numphs molted, the degree of ossification of the stylet bundles was enhanced (increased) and the nymphs returned to the branches for living, where the strengthened stylet bundles may provide a better adaption for the thicker bark. All told, the first and second stage instar CWWS nymphs switched from leaves to the branches in order to find a safe habitat and stable food source.