State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology

Fuzhou, China

State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology

Fuzhou, China

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Bingqiao G.,Fujian Normal University | Quanlin Z.,Fujian Normal University | Quanlin Z.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Yuzhu M.,Fujian Normal University | And 6 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2016

Forest ecosystems play an important role in global carbon cycle. Accurate understanding of below- and above-ground biomass allocation pattern (i.e. the root-shoot ratio, R/S) and its influencing factors would help to better characterize the regional and global carbon sink, stock and cycle of forest ecosystems. The purpose of this paper was to investigate the effects of climatic and stand factors on the root-shoot ratio of China's natural forests at a large scale. We classified all data of 1109 sample plots into 17 types of forest and calculated the R/S [root biomass / (stem + branch + leaf biomass)] of the forest communities. Because precipitation could not completely reflect the forest water conditions, the ratio of mean annual precipitation to potential evaporation was used to evaluate the impact of water availability on the R/S. Finally, latitude, longitude, temperature, water availability, stand density and stand age were selected to analyze their effects on the R/S using multiple linear regression. Our results showed the mean value of R/S in China's natural forests as 0.26. The R/S of deciduous forests was significantly higher than that of evergreen forests, and the R/S of broadleaved forests was higher than that of conifer forests. Furthermore, R/S of China's natural forests was significantly and negatively correlated with the stand age and water availability. The major influencing factors for the R/S of China's nature forests were latitude and stand density. The results suggested that we should include in consideration temperature and stand density in calculation of forest carbon stock and forest biomass allocation.


Chen X.,Fujian Normal University | Chen X.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Lin M.,Fujian Normal University | Cheng N.,Nanyang Technological University | Lin B.,Fujian Normal University
Shuikexue Jinzhan/Advances in Water Science | Year: 2013

The time-mean velocity profile of turbulent open-channel flows over rough and permeable beds is analyzed both experimentally and theoretically in this study. The velocity profile can be derived from a slip velocity at the bed surface and an origin displacement, a modified logarithmic law is thus obtained. The experiment is conducted in a glass-sided flume where the channel bed is prepared with uniform marbles 1 cm in diameter. The velocity is measured using a laser doppler velocimeter. The profile of the measured velocity is used to validate the theoretically derived profile. The result shows that the modified logarithmic law is able to well describe the measured velocity profile. Under the same flow condition, the shear velocity over the permeable bed would be greater than that over the impermeable bed. The value of the flow at the permeable interface is about 0.35 to 0.45 times that of the average stream flow.


Fei L.,Fujian Normal University | Fei L.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Zhong Q.,Fujian Normal University | Zhong Q.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | And 8 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2015

For a comprehensive understanding of the nutrient conservation mechanism of Machilus pauhoi in subtropical zone, we need to know the response of leaf nutrient resorption efficiency to the environment and fertilizer. This research aimed to study the variation of leaf nutrient resorption efficiency with nitrogen and phosphorus spraying in different seasons. A 7.5-year-old M. pauhoi plantation in Fujian Province was taken as research object. Different levels of N and P were set by foliage top-dressing to the plantation. Samples were taken to determine their nutrient contents in June, September and December. Two-factor Variance Analysis was used to analyze the effect of the seasons and N, P spraying on the leaf nutrient resorption efficiency. The results showed that 1) different levels of N, P spraying had significant effects on leaf N, P resorption efficiency except for the low level N with N/P combined addition, and the medium level N with N/P combined addition; there were significant differences in N and P resorption efficiency of different seasons under different levels of fertilization (except for P addition. 2) N spraying could help vegetation to absorb P efficiently, and vise versa, in growing season; there was a positive relation between the resorption efficiency of N and P. 3) In mature leaves N resorption efficiency was positively related to N content, but in senesced leaves N resorption efficiency was negatively related to N content. An obvious N, P resorption phenomenon existed in M. pauhoi leaves in the process of senescing. The N and P resorption efficiency showed significant differences responding to fertilization and seasons. This research added our knowledge about the nutrient conservation mechanism of evergreen broad-leaved forest in subtropical zone. © 2015, Science Press. All rights reserved.


Guo J.F.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Guo J.F.,Fujian Normal University | Yang Y.S.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Yang Y.S.,Fujian Normal University | And 6 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2015

Soils have twice content the amount of carbon (C) present in the atmosphere and C in soils is about two to three times greater than that accumulated in living organisms in terrestrial ecosystems. Due to the large C pool in soils, small deviations in the different C forms may also have a significant effect on the global C balance and consequently on climate change. Fire is a major driver of ecosystem processes and the C cycle process in forests. The forest fires are widespread worldwide phenomenon. It is important to understand the effect of high intensity fires and prescribed fire on soils. This paper reviews the effect of forest fires on the quantity and quality of soil organic C (SOC) and C release. It is focused mainly on soil respiration and soil organic C fractions; i.e. microbial biomass C (MBC), light fraction organic carbon (LFOC), dissolved organic C (DOC) and black carbon. Generally, intense prescribed fire or wildfire can lead to complete destruction of the organic layer and SOC in the topsoil. On the other hand, the effect of moderate prescribed fire is often minor and sometimes organic C increases after fire due to increased input of partly charred material or litter from decaying trees. Low- intensity prescribed fire usually results in little change of soil C. Soil respiration, including autotrophic and heterotrophic respiration, is an integrated result of the belowground processes. It has been widely used to evaluate the effects of disturbance on soil carbon pools. Fire can change the rate of soil respiration by reducing soil moisture and organic matter, increasing surface temperature, and reducing soil microbial populations at varying degrees. Soil respiration rates have been shown to be an increase, decrease or no significant change with burning, depending primarily upon fire intensity, observation time after fire, forest type, vegetation regrowth process, and climatic condition, etc. On the other hand, fire not only perturbs the level of SOC, but also redistributes different labile fractions of organic carbon. Changes in labile SOC induced by fire have been noted to be more complex. Overall, fire significantly increases the soil DOC, but decreases soil LFOC and MBC. Relative to labile fractions of SOC, black carbon, a byproduct of wildfires and prescribed fires, is more stable and contributes to the long-term C sequestration. Despite the importance of black carbon on forest soils, there is limited information about the influence of fire on soil black carbon. Some studies note an increase, and some other studies indicate no effect or little effect of fire. Forest frequency, fire intensity and soil sampling depth are important variables for assessing the impact of fire on soil black carbon. In the future, more researches would be required (1) to determine effects of climate and forest management on dynamics of forest soil organic C, (2) to elucidate the process and mechanisms of CO2 release following fire, (3) to assess the influence of fire history and frequency on soil black carbon, and (4) to determine forest soil carbon dynamics affected by forest management such as fire under field conditions and especially in subtropical ecosystems. © 2015, Ecological Society of China. All rights reserved.


Zhang L.-L.,Fujian Normal University | Zhang L.-L.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Zhong Q.-L.,Fujian Normal University | Zhong Q.-L.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | And 10 more authors.
Chinese Journal of Applied Ecology | Year: 2015

To explore the effects of stand age on variation patterns of leaf C, N, P stoichiometric characteristics of Machilus pauhoi, two stands, i.e., 9 and 13 years old, were selected. The relationships between leaf nutrient contents (C, N and P) and diameters at breast height (DBH) of individual plants were analyzed. The data revealed that the individual variations of seedlings in M. pauhoi stands were strengthened with the stand development. The stand age had significant effects on leaf C, N, P contents and C:N ratio but not on C:P and N:P ratios. Specifically, the mean values of leaf C, N, P contents and N:P ratio in the 9-year-old stand were lower than those in the 13-year-old stand, whereas, inverse pattern of C:N and C:P ratios were found in the two stands. Furthermore, leaf N and P stoichiometry varied significantly within the stand. Specifically, leaf N and P contents, as well as their stoichiometric ratios, linearly correlated with DBH in the 9-year-old stand. On the contrary, leaf N and P stoichiometry showed quadratic correlation in 13-year-old stand (except leaf C:N which linearly correlated with DBH). Lastly, nutrient transfer rates of leaf N and P in the 9-year-old stand were higher than that in 13-year-old stand, and the discrepancies of leaf nutrient transfer strategy between growing and non-growing seasons were caused by the different growth phases and environmental conditions. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved.


Li X.-F.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Li X.-F.,Fujian Normal University | Chen Z.-B.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Chen Z.-B.,Fujian Normal University | And 3 more authors.
Research of Environmental Sciences | Year: 2013

Heavy metals in urban ground surface dust are one of the most serious threats affecting human health and urban environments. Concentrations, sources and health risk assessments of heavy metals in ground surface dust from bus terminals in Fuzhou City were studied to evaluate their pollution levels. The results showed that concentrations of Cr, Cu, Zn and Cd in ground surface dust were 2.74, 4.21, 4.01 and 4.68 times higher than those in the urban soil of Fuzhou City. Co, Ni and Mn in dust came from urban soils; Cd, Pb and Cu were possibly related to transportation process; Cr was mainly associated with urban soil and transportation process; Zn originated from compound pollutant sources including transportation process, urban domestic pollution and industrial activities. The exposure dose and non-cancer risk of heavy metals through exposure decreased as: ingestion>dermal absorption>inhalation. The non-cancer risk for children was higher than for adults. Meanwhile, the cancer risk of heavy metals declined in the order of Cd>Ni>Cr. Heavy metals in ground surface dust from urban bus terminals are mainly affected by transportation process.


Liu M.-B.,Fujian Normal University | Liu M.-B.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Liu M.-B.,Center for Monitoring Research | Chen D.-P.,Fujian Normal University | And 6 more authors.
Chinese Journal of Applied Ecology | Year: 2013

A coupled watershed-reservoir modeling approach consisting of a watershed distributed model (SWAT) and a two-dimensional laterally averaged model (CE-QUAL-W2) was adopted for simulating the impact of non-point source pollution from upland watershed on water quality of Shanmei Reservoir. Using the daily serial output from Shanmei Reservoir watershed by SWAT as the input to Shanmei Reservoir by CE-QUAL-W2, the coupled modeling was calibrated for runoff and outputs of sediment and pollutant at watershed scale and for elevation, temperature, nitrate, ammonium and total nitrogen in Shanmei Reservoir. The results indicated that the simulated values agreed fairly well with the observed data, although the calculation precision of downstream model would be affected by the accumulative errors generated from the simulation of upland model. The SWAT and CE-QUAL-W2 coupled modeling could be used to assess the hydrodynamic and water quality process in complex watershed comprised of upland watershed and downstream reservoir, and might further provide scientific basis for positioning key pollution source area and controlling the reservoir eutrophication.


Fan Y.X.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Fan Y.X.,Fujian Normal University | Yang Y.S.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Yang Y.S.,Fujian Normal University | And 10 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2013

Soil organic carbon (SOC) plays an essential role in determining the physical and chemical characteristics of soil and therefore in determining its fertility.Currently, there has been an additional interest in the role of SOC as a potential sink for atmospheric CO2.Meanwhile, SOC is recognized to consist of various fractions varying in degree of decomposition, recalcitrance, and turnover rate.For example, dissolved organic carbon (DOC) is biologically available and a source of C and energy for soil microorganisms.Although the absolute C amount in microbial biomass (MBC) is small, the microbes are the most important labile C pool since they are vital for SOC dynamics and nutrient cycling.As SOC is a heterogeneous mixture of organic substances, the different forms or fractions of SOC might have different effects on soil fertility and quality. Forest succession is a fundamental ecological process which can modify biogeochemical cycles, ameliorate stand conditions and microclimate factors and change in species composition and abundance.Soil carbon, nitrogen and microbe in the secondary forest succession have been studied. However, changes of soil labile fractions along with the secondary successional gradient of evergreen broadleaved forests, have not been reported.The objective of this study was to evaluate the effects of forest succession on soil labile fractions (MBC and DOC) and soil microbial quotient (SMQ).Soil samples were collected from a secondary successional sequence of evergreen broadleaved forest in Wangmulin Nature Reserve in Fujian Province.This successional series included three sites (one early successional site, one midsuccessional site and one late successional site) that were closely located.According to the age and vegetation type, we categorized the 15 year-old site as early successional; the 47 year-old site as midsuccessional; and the 110 year-old site as late successional. These successional sites are similar in topography, regional climate and soil type.The results showed that SOC, MBC, DOC and SMQ in 47-year-old and 110 year-old forests were significantly higher than those in 15 year-old forest (P<0.05).MBC and DOC in 47-year-old forest were higher than those in 110 year-old forest, but there were no significant differences in SOC and SMQ between these two forests.SOC, DOC and MBC decreased with soil depth in three successional stages.Also, succession promoted accumulation of SOC, MBC and DOC in humus layer.We also found that MBC, DOC and SMQ had significant seasonal dynamics at three succession stages, the lowest values occurred in autumn, and the highest values transferred from winter to summer with the succession.Seasonal fluctuation of soil MBC content at 0-40cm soil depth ranged from 216.5 to 411.2 mg/ kg, 471.9 to 964.1 mg/ kg and 374.5 to 903.0 mg/ kg in early-, mid- and late successional forests, respectively.The corresponding DOC content ranged from 486.5 to 667.9 mg/ kg, 987.1 to 1 318.2 mg/ kg and 828.4 to 1028.9 mg/ kg in early-, mid- and late successional forests, respectively.Correlation analysis showed that SOC significantly correlated with MBC and DOC (P<0.01).MBC, DOC and SMQ were more sensitive to the changes of soil carbon storage than SOC.It suggested that forest succession significantly affects seasonal variations and contents of soil labile organic C, which may be attributed to a combination of factors including quantity of litter materials, microbial activity etc., which would change greatly with the forest succession.


Chang Y.,Fujian Normal University | Zhong Q.,Fujian Normal University | Zhong Q.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Cheng D.,Fujian Normal University | And 4 more authors.
Journal of Plant Resources and Environment | Year: 2013

Taking twenty-six main dominant species in arbor, shrub and herb layers of Castanopsis carlesii (Hemsl.) Hayata natural forest in Youxi of Fujian Province as research objects, variation and correlation of C, N and P contents and their ratios in different organs of plants were analyzed, and distribution characteristics of their contents in different organs among different layers were also studied. The results show that in the same organ, C average content is the highest while P average content is the lowest. In which, contents of C, N and P in leaf are 344. 95-486. 15, 6. 26-19. 50 and 0. 18-0. 62 mg·g-1, and ratios of C/ N, C/ P and N/ P are 22. 52-61. 21, 696. 64-2 589. 72 and 11. 38-58. 94, respectively; contents of C, N and P in root are 277. 95-458. 30, 1. 41-12. 73 and 0. 13-0. 44 mg·g-1, and ratios of C/ N, C/ P and N/ P are 34. 63-296. 17, 731. 45-3 372. 69 and 8. 81-34. 41, respectively; contents of C, N and P in branch of plants in arbor and shrub layers are 407. 75-473. 75, 3. 10-7. 39 and 0. 09-0. 61 mg·g-1, and ratios of C/ N, C/ P and N/ P are 57. 43-148. 15, 776. 64-5 054. 44 and 7. 05-48. 11, respectively; and contents of C, N and P in trunk of plants in arbor layer are 432. 56-463. 32, 2. 67-6. 35 and 0. 16-0. 31 mg·g-1, and ratios of C/ N, C/ P and N/ P are 68. 12-167. 73, 1 494. 58-2 860. 63 and 11. 35-29. 06, respectively. In different organs of arbor layer plants, the order of C content from high to low is leaf, branch, trunk, root, while that of N and P contents is leaf, branch, root, trunk. In shrub layer plants, C content is the highest in branch and the lowest in root, while N and P contents are the highest in leaf and the lowest in branch. In herb layer plants, contents of C, N and P in above-ground part are higher than those in under-ground part. Except having extremely significantly positive correlation between contents of N and P in root, correlations among contents of C, N and P in the same organ are unsignificant, but most correlations between their contents and ratios of C/ N, C/ P and N/ P are extremely significant. Contents of C, N and P in different organs are varied with different layers of plants, in which, those in leaf of plant in arbor layer are the highest, while those in herb layer are the lowest. And C content is the highest and N content is the lowest in whole plant of arbor layer, and N content is the highest and C content is the lowest in whole plant of herb layer, while P content in whole plant of different layers is close. It is suggested that contents of C, N and P in leaf of plants of C. carlesii natural forest in Youxi are lower and P deficiency is likely to the most important element for limiting productivity of this forest.


Qiao C.-K.,University of Sichuan | Liu X.-N.,University of Sichuan | Chen X.-W.,Fujian Normal University | Chen X.-W.,State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology | Cheng N.-S.,Nanyang Technological University
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2013

Flow resistance in gravel-bed rivers is usually investigated by considering variation in relative roughness height, while relevant friction law for the porous permeable layers is not well understood. By applying Ergun equation, the friction law of seepage through packed beds composed of glass beads was investigated. Different flow regimes were observed with varying head loss measured. The results showed that the friction factor decreases with increasing Reynolds number and the data collected for different cases collapse almost into a single curve when the wall effects are considered. Finally an improved Ergun correlation was proposed to evaluate the flow resistance of packed permeable beds with small bed-to-particle ratios.

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