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Mi F.,Huazhong Agricultural University | Sun X.,Huazhong Agricultural University | Chen J.,Hubei Academy of Forestry | Wang M.-Q.,Huazhong Agricultural University
Entomologia Generalis | Year: 2014

The morphology of newly hatched larvae of the important parasitoid beetle Dastarcus helophoroides (Coleoptera: Bothrideridae) was examined by scanning electron microscopy. This study examined the morphological structures of the cephalic, the thoracic. and abdominal regions of newly hatched larvae, and the distribution of sensilla on these structures. Sensilla chaetica and sensilla styloconica were identified on the maxillae, labium and antenna, sensilla chaetica were identified on the labrum and mandible, sensilla basiconica, Bohm's bristles and sensilla chaetica were found in the thoracic region. and sensilla basiconica were found encircling the body on all abdominal segments. In addition, our comparative morphological observations found no evidence of sexual dimorphism in newly hatched larvae in terms of shape, structure, sensilla distribution or typology. © 2014 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.

Cheng R.,Chinese Academy of Forestry | Feng X.,Chinese Academy of Forestry | Xiao W.,Chinese Academy of Forestry | Wang R.,Chinese Academy of Forestry | And 3 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2011

Masson pine is one of the main native plantation species in South China due to its fast and easy growing characteristics. Plantation area of the species increased dramatically and its growth was significantly impacted by climate change in past decades. The relationship between net productivity of masson pine plantation and climatic factors, especially for the plantation in its northern natural distribution boundary where masson pine growth is more sensitive to changes of climatic factors, is important to understand the response of its growth to climate change. We set six 20m×20m plots in 30 years old masson pine plantation in Jigongshan National Nature Reserve of Henan Province for doing this study. Both height and diameter at breast height (DBH) of all trees were measured and six cross increment cores at breast height of three sample trees were got in each plot. Tree ring widths of the dried and burnished cores were measured with Lintab tree ring analysis system. Annul diameters and heights of the sample trees were calculated using the annul tree ring widths. Biomass and net productivity of the old masson pine stands in the past 30 years were calculated based on the regressive equations between biomass and height and DBH in this area. After that, correlations between productivity and climate factors, including monthly and seasonal temperature, humidity, precipitation, sunshine and the Palmer Drought Severity Index (PDSI), were analyzed. The regressive equation between net productivity and climatic factors of the plantation in the area was established finally. The results indicated that biomass of the plantation increased more than three times in the past 30 years, from 59.00 t/hm2 in 1980 to 254.75 t/hm2 in 2009, and mean net productivity of the stand was 6.64t·hm-2·a-1. Net productivity was closely correlated with climatic factors. The effects of temperature, sunlight, precipitation and humidity on net productivity were different. There were positive correlations between productivity and precipitation in last August, mean temperature in February, precipitation in March, mean humidity in May, and mean temperature and total sunlight in October. There were negative correlations between productivity and total sunlight in May, precipitation and mean humidity in October. Productivity was correlative positively with PDSI from February to September. Seventy one percent of the changes of productivity could be interpreted by climatic factors. Generally, biomass of masson pine plantation in North Subtropical Region could accumulate as high as that in low-latitude region but net productivity in the region was much less than that in low-latitude region. Annual changes of net productivity were mainly caused by climatic factors, especially the length of growing season and soil water availability in growing season. It is implied that both biomass and mean net productivity of the plantations could increase in the future due to possible increase of temperature and precipitation in the North Subtropical Region.

Zha Y.-P.,Huazhong Agricultural University | Lei C.-L.,Hubei Academy of Forestry
Journal of Agricultural and Urban Entomology | Year: 2012

Noctuid moths with tympanal organs perform a series of evasive maneuvers when exposed to bat-like ultrasounds. In this paper, we tested the hypothesis that certain ultrasound frequencies are environmental stress factors that have physiological effects on noctuid moths. The effects of ultrasound produced from a commercial device on the antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), and peroxidase (POX), were investigated in the adults, pupae, and larvae of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae). Our results showed that the effects of ultrasound-stress on antioxidant enzymes depended on the developmental stages of H. armigera and the duration of exposure. A significant (P < 0.01) increase in POX activity in adult and larval H. armigera was observed 40 minutes after ultrasound exposure. The results indicated that ultrasound stress has the potential to alter the antioxidant enzyme system in H. armigera. © The South Carolina Entomological Society, Inc.

Lei J.-P.,Chinese Academy of Forestry | Xiong D.-P.,Huazhong Agricultural University | Liu J.-F.,Chinese Academy of Forestry | Xiao W.-F.,Chinese Academy of Forestry | And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2012

Quercus variabilis seedlings were collected from the habitats at different latitudes, and transplanted on the same experimental sites installed in the central part and southern and northern boundaries of China, where Q. variabilis has a natural distribution, aimed to study the effects of habitat change on the nutrient contents in the seedlings in their vigorous growth period. With habitat change, the various organs nitrogen (N) content and the stem phosphorous (P) content of the transplanted seedlings changed significantly, but the organs potassium (K) content and the leaf- and root P content had less change. In the experimental sites, the organ N content of the transplanted seedlings had significant positive correlation with the latitudes where the seedlings grew, the stem-and root P contents decreased with the increasing latitude, while the leaf N:P ratio had less change. The organ N and P contents of the transplanted seedlings growing in northern boundary decreased significantly, and the effect of the latitudes was more obvious. The leaf N:P ratio of all the seedlings transplanted from different altitudes increased to different degrees. It was concluded that the nutrient contents in different organs of Q. variabilis seedlings varied with latitude, and the seedlings had different responses to habitat change.

Li D.-W.,U.S. Department of Soil and Water | Kendrick B.,8727 Lochside Drive | Chen J.,Hubei Academy of Forestry
Mycological Progress | Year: 2012

Two new species, Codinaea sinensis and Parapleurotheciopsis quercicola from leaf litter of Quercus phillyraeoides collected from Wudangshan, Hubei, China are described and illustrated. Conidiogenous cells of Codinaea sinensis are phialides, the conidia 1-celled, falcate, smooth, colorless, 9.7-11 × 2.0-2.4 μm, with a single, unbranched setula at each end. Conidia of Parapleurotheciopsis quercicola are 3-5-septate, cylindro-ellipsoidal, colorless, smooth, thin-walled, 19-24 × 4.4-5.4 μm. A key to the species of Parapleurotheciopsis is provided. Two new records for China, Subramaniomyces fusisaprophyticus and Taifanglania inflata are also reported. © 2012 German Mycological Society and Springer.

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