Wyniki wyszukiwania

1

Simulation of shift of range for Betula costata Trautv. and Juglans mandshurica Maxim. along Northeast China Transect [NECT]

100%

Chen X.

Polish Journal of Ecology

|

2002

|

tom 50

|

nr 3

2

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Power law relationships in the branches of loblolly pine, red maple and sugar maple trees

64%

Chen X., Burton S.

Dendrobiology

|

2010

|

tom 63

Power laws are interesting patterns that exist over wide ranges. Power laws may be used to determine the organization of countless networks in nature. The purpose of this study was to test whether the distribution patterns in shoot lengths of three popular tree species follow a power law. This study not only adds to the general knowledge base for these species but also may be used to make predictions about other species. Three common tree species were included in this study: loblolly pine (Pinus taeda), redmaple (Acer rubrum), andthe sugar maple (Acer saccharum). The height and all shoot lengths of five individuals of each tree species were measured, recorded and sorted. Loblolly pines and sugar maples followed the same power law at individual and species level. Most of the red maple individuals did not follow a power law although they followed a power law at the species level. One possible reason might be that the redmaple trees measuredwere too young and were in strong competition for resources with other tree species.

3

Luteolin attenuates cognitive dysfunction induced by chronic cerebral hypoperfusion through the modulation of the PI3K/Akt pathway in rats

64%

He H., Chen X.

Journal of Veterinary Research

|

2021

|

tom 65

|

nr 3

4

Four new species of the subgenus Steganina (Diptera: Drosophilidae: Stegana) from Southern China

64%

Chen X., Chen H.

Annales Zoologici

|

2009

|

tom 59

|

nr 4

Four new species of the subgenus Stegana (Steganina) are found from southern China: S. (S.) clavispinuta sp. nov., S. (S.) cyclophylla sp. nov., S. (S.) euryphylla sp. nov. and S. (S.) lepisminci spp. nov., they can not to be placed under four species groups established. A key to the species of uncertain affinity among species group from China is provided.

5

The role of B lymphocytes as antigen-presenting cells

63%

Chen X., Jensen P. E.

Archivum Immunologiae et Therapiae Experimentalis

|

2008

|

tom 56

|

nr 2

6

The species of the genus Rhaconotus Ruthe, 1854 [Hymenoptera: Braconidae: Doryctinae] from China with a key to species

63%

Belokobylskij S. A., Chen X.

Annales Zoologici

|

2004

|

tom 54

|

nr 2

The fourteen new species of Rhaconotus Ruthe, 1854 from South Asia are described and illustrated: Rh. affinis sp. nov., Rh. chinensis sp. nov., Rh.fujianus sp. nov., Rh. hei sp. nov., Rh. heterotrichus sp. nov., Rh. intermedius sp. nov., Rh. ipodoryctoides sp. nov., Rh. iterabilis sp. nov., Rh. luteosetosus sp. nov., Rh. magnus sp. nov., Rh. oriens sp. nov., Rh. tergalis sp. nov., Rh. tianmushanus sp. nov., and Rh.yaoae sp. nov. The following species are recorded first time for the fauna of China: Rh. aciculatus Ruthe, Rh. menippus Nixon, Rh. nadezhdae (Tobias et Belokobylskij), and Rh. zarudnyi Belokobylskij. The key for determination of Chinese species of Rhaconotus is provided.

7

Characteristics of diurnal water loss of five adjacent ecosystems at Changbai Mountains in Northeast China

63%

Chen X., Li B. L.

Polish Journal of Ecology

|

2004

|

tom 52

|

nr 3

Changes in ecosystem water consumption and hydrological processes following ecosystem alterations are important for environmental management and regional water supply. In this study on relatively dry days, the temporal dynamics of diurnal soil water contents at different soil depths were investigated within five adjacent ecosystems (primary forest and four ecosystems changed from the primary forest after human disturbance – clear-cut, grassland, shrub and secondary forest) at the altitude around 700 m a.s.l. at Changbai Mountain in Northeast China. On July 17, 2001 the diurnal water loss in the clear-cut was the highest among the five ecosystems and reached about 3.74 ¥ 10⁵ kg ha⁻¹, and it was lowest and about 1.07 ¥ 10⁵ kg ha⁻¹ in the primary forest of mixed broadleaved Korean pine forest. The temporal dynamics of soil water contents at different depths in the studied ecosystems were complicated but there were some common characteristics. First, soil water contents were higher at soil surface (about 0–10 cm) and then decreased with the soil depths. Second, soil moisture fluctuations were most rapid in the depths of 0–10 cm and 10–20 cm, and were comparatively slow and more moderate at the greater depths. The spatial and temporal changes of soil water content might be related with aboveground plants. Therefore, after the primary forest was converted to other ecosystems the hydrological characteristics of the ecosystem were changed, which would potentially affect regional hydrological processes.

8

First record of the genus Lepteucosma Diakonoff from China, with description of one new species [Lepidoptera: Tortricidae]

63%

Wu C., Chen X.

Acta Zoologica Cracoviensia. Ser.B Invertebrata

|

2006

|

tom 49B

|

nr 1-2

9

A review of the species of the Australo-Asian genus Sonanus Belokobylskij et Konishi [Hymenoptera: Braconidae: Doryctinae]

63%

Belokobylskij S. A., Chen X.

Annales Zoologici

|

2005

|

tom 55

|

nr 3

A review of the species of the Australo-Asian genus Sonanus Belokobylskij et Konishi, 2001 is given. Two new species are described: S. chinensis Belokobylskij et Chen, sp. nov. (China) and S. indicus Belokobylskij, sp. nov. (India). S. senzuensis Belokobylskij et Konishi is recorded in China for the first time. A key to all known species of this genus is provided.

10

Revision of the Asian species of the genus Hypodoryctes Kokujev, 1900 [Hymenoptera: Braconidae: Doryctinae]

63%

Belokobylskij S. A., Chen X.

Annales Zoologici

|

2004

|

tom 54

|

nr 4

A revision of the Asian species of the genus Hypodoryctes Kokujev, 1900 is provided. Seven new species are described and figured: H. cantata Belokobylskij et Chen sp. nov. (Russian Far East, Korea, Japan), H. fuga Belokobylskij et Chen sp. nov. (Russian Far East, Korea, Japan, China, Vietnam), H. rapsodia Belokobylskij sp. nov. (Azerbaijan), H. rondo Belokobylskij et Chen sp. nov. (Vietnam, China), H. serenada Belokobylskij et Chen sp. nov. (China), H. symphonia Belokobylskij sp. nov. (Vietnam), H. tango Belokobylskij et Chen sp. nov. (China). Redescriptions of H. sibiricus Kokujev, 1900 (Palaearctic, Myanmar, Mexico, Costa Rica), H. bilobus (Shestakov, 1940) (Russian Far East, Korea, Japan, China) and H. torridus Papp, 1987 (Russian Far East, Korea, Japan, China) are given. A key to all species of the genus Hypodoryctes is provided.

11

Salt priming improved salt tolerance in sweet sorghum by enhancing osmotic resistance and reducing root Na+ uptake

51%

Yan K., Xu H., Cao W., Chen X.

Acta Physiologiae Plantarum

|

2015

|

tom 37

|

nr 10

This study attempted to explore how salt priming affected salt tolerance in sweet sorghum with emphasis on root Na+ uptake. After 10 days of pretreatment with 150 mM NaCl, plants were stressed with 300 mM NaCl. After salt stress for 7 days, dry matter of root and shoot decreased by 58.7 and 69.7 % in non-pretreated plants and by 37.9 and 41.3 % in pretreated plants. Consistently, pretreated plants maintained higher photosynthetic rate during salt stress, suggesting the enhanced tolerance by salt priming. Salt priming enhanced osmotic resistance, as proline and relative water contents in the leaf were higher in pretreated plants under salt stress. Salt priming alleviated salt-induced oxidative damage not by improving antioxidant protection due to lower increase in leaf malondialdehyde content and no extra induction on ascorbate peroxidase, catalase, superoxide dismutase,ascorbic acid and reduced glutathione in pretreated plants. After 7 days of salt stress, root Na+ efflux increased by 8.5- and 3.9-folds in pretreated and non-pretreated plants, suggesting that salt priming reduced root Na+ uptake, and then root and leaf Na+ accumulation were mitigated in pretreated plants. However, root Na+ extrusion became indifferent between pretreated and non-pretreated plants under salt stress after inhibiting plasma membrane (PM) Na+/H+ antiporter. Thus, the greater Na+ extrusion induced by salt priming had relation to PM Na+/H+ antiporter. Overall, salt priming improved salt tolerance in sweet sorghum by enhancing osmotic resistance and reducing root Na+ uptake.

12

Effect of water flows on ship traffic in narrow water channels based on cellular automata

51%

Hu H., Chen X., Sun Z.

Polish Maritime Research

|

2017

|

tom 24

|

nr Special Issue S3

In narrow water channels, ship traffic may be affected by water flows and ship interactions. Studying their effects can help maritime authorities to establish appropriate management strategies. In this study, a two-lane cellular automation model is proposed. Further, the behavior of ship traffic is analyzed by setting different water flow velocities and considering ship interactions. Numerical experiment results show that the ship traffic density-flux relation is significantly different from the results obtained by classical models. Furthermore, due to ship interactions, the ship lane-change rate is influenced by the water flow to a certain degree

13

Review of the bamboo delphacid genus Malaxa Melichar (Hemiptera: Fulgoroidea: Delphacidae) from China

51%

Chen X., Li X., Liang A., Yang L.

Annales Zoologici

|

2006

|

tom 56

|

nr 1

The genus Malaxa Melichar, 1914 (Hemiptera: Fulgoroidea: Delphacidae: Tropidocephalini) feeding exclusively on bamboo (Bambusoideae), containing 4 species: M. delicata Ding et Yang, 1986 (Guizhou: Guiyang; Yunnan: Mongban; Zhejing: Hangzhou; Fujian: Huangkeng), M. hunanensis Chen sp. nov. (Hunan: Zhangjiajie), M. fusca Yang et Yang, 1986 (Taiwan: Nantou) and M. semifusca Yang et Yang, 1986 (Taiwan: Nantou; Hualian; Guizhou: Daozhen) from China is here reviewed. The male of M. fusca Yang et Yang, collected from Nantou County of Taiwan, is reported and described for the first time. The main morphological characters and male genitalia of 4 species are described and illustrated. A key to species in the genus from China is provided.

14

Adaptive strategy to drought conditions: diurnal variation in water use of a Central Asian desert shrub

51%

Wang S.-S., Chen X., Zhou K.-F., Wang Q.

Polish Journal of Ecology

|

2015

|

tom 63

|

nr 1

Water availability is one of the most important factors limiting photosynthetic assimilation of carbon dioxide and growth of individual plants in terrestrial ecosystems. It is especially important for desert shrubs because the diurnal water availability is particularly sensitive to climate change in arid ecosystems. Water use efficiency (WUE) is an indicator of water availability and is frequently used to assess plant performance in various ecosystems, particularly in arid ecosystems. The WUE of plants has been widely assessed using ecological methods and field measurements; however, these approaches are impractical to obtain numerous near-simultaneous estimates of plant water status at the landscape-scale. Consequently, landscape-scale assessments of plant water status are practically pursued through modeling. In this study, measurement and modeling of the diurnal variations of WUE were conducted for a native dominant desert shrub, Tamarix ramosissima, in its original habitat on the periphery of the Gurbantunggut Desert, China. The diurnal net photosynthesis (An), stomatal conductance (gs), and transpiration (Tr) were measured for each individual using a portable photosynthesis system. A coupled model of stomatal conductance, photosynthesis, and transpiration was applied to simulate the diurnal dynamics of An, gs, Tr, and WUE. The model explained 83, 47, 83, and 55% of the variance in the measured An, gs, Tr, and WUE values, respectively, for this desert ecosystem in which T. ramosissima is sparsely distributed. The results demonstrated that the coupled photosynthesis-stomatal conductance-transpiration model strategy is a promising approach to estimate water availability in desert ecosystems in Central Asia.

15

Models for predicting frictional properties of rapeseed

51%

Xu Q., Cheng X., Chen X.

International Agrophysics

|

2019

|

tom 33

|

nr 1

16

Regional ecological network planning for biodiversity conservation:a case study of China’s Poyang Lake Eco-economic Region

51%

Yang H., Chen W., Chen X.

Polish Journal of Environmental Studies

|

2017

|

tom 26

|

nr 4

Ecological networks have been considered to be an effective strategy to counter habitat fragmentation, which is occurring in the urbanization context. Researchers and planners have begun to integrate ecological networks in both thematic planning and urban or regional planning for biodiversity conservation and sustainable development. In this paper, we integrated the least-cost path model, network structure analysis, and gravity model to construct a regional ecological network of Poyang Lake Eco-economic Region, China. The least-cost model was improved by integrating three resistance factors, including land cover, slope, and human-induced pressure into it, presenting the landscape characteristics comprehensively in corridor simulation. The network structure analysis was employed to assess the proposed ecological network and the gravity model was used to identify the relative significance of network elements. Results indicated that the proposed hierarchical ecological network has good circuitry, complexity, and connectivity. Spatial analysis of prioritized network elements and breaking points revealed the regional connectivity condition, presenting significant reference to decision making in both land-use management and network implementation. Our study demonstrated that the integrated methodology is effective in regional ecological network planning and shows feasibility to be applied to other regions.

17

Photosynthetic and physiological responses of mangroves under an environmental deterioration

51%

Guo J., Chen X., Bao H., Li Y.

Acta Physiologiae Plantarum

|

2016

|

tom 38

|

nr 06

18

An overview of ecohydrology of the Yellow River delta wetland

51%

Zhang H., Chen X., Luo Y.

International Journal of Ecohydrology and Hydrobiology

|

2016

|

tom 16

|

nr 1

19

“Noise” in climatologically driven ocean models with different grid resolution

51%

Tang S., von Storch H., Chen X., Zhang M.

Oceanologia

|

2019

|

tom 61

|

nr 3

20

Growth responses and non-structural carbohydrates in three wetland macrophyte species following submergence and de-submergence

51%

Qin X., Li F., Chen X., Xie Y.

Acta Physiologiae Plantarum

|

2013

|

tom 35

|

nr 07

We investigated the responses of growth and non-structural carbohydrates to submergence and de-submergence in three wetland macrophyte species. Survival rate, recovery ability, and soluble sugar and starch contents of flood-tolerant Polygonum hydropiper and of flood-sensitive Phalaris arundinacea and Carex argyi from Dongting Lake wetlands were investigated after 20, 40, and 60 days of complete submergence without light and 10 days after de-submergence. Plant dry weight and soluble sugar and starch contents decreased in all species during the submergence period. The decreases were slowest in P. hydropiper, intermediate in C. argyi, and most rapid in P. arundinacea. After 60 days of submergence, survival rates were 100, 50, and 0 % in P. hydropiper, C. argyi, and P. arundinacea, respectively. After recovery, plant dry weight increased in P. hydropiper and in C. argyi, but decreased in P. arundinacea. Compared to pre-submergence, soluble sugar contents generally increased and then remained relatively constant after recovery in all species, while starch content increased in P. hydropiper and decreased in P. arundinacea with increasing submergence time. For C. argyi, starch content decreased after recovery from the 20-day submergence, but increased after recovery from the 40- and 60-day submergences. These data illustrate mechanisms behind the flood tolerance of P. hydropiper and the sensitivity to flooding in P. arundinacea and C. argyi. These mechanisms include lower consumption and quicker accumulation of non-structural carbohydrates in flood-tolerant plants.

Ograniczanie wyników

Simulation of shift of range for Betula costata Trautv. and Juglans mandshurica Maxim. along Northeast China Transect [NECT]

Power law relationships in the branches of loblolly pine, red maple and sugar maple trees

Luteolin attenuates cognitive dysfunction induced by chronic cerebral hypoperfusion through the modulation of the PI3K/Akt pathway in rats

Four new species of the subgenus Steganina (Diptera: Drosophilidae: Stegana) from Southern China