Deng H.,Fuzhou University |
Deng H.,Longyan City Research Institute of Forestry science |
Hong T.,Fuzhou University |
Hong T.,Key Laboratory for Forest Ecosystem Process and Management of Fujian Province |
And 8 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2014
This research tried to report for the first time the production of lipid by endophytic fungi isolated from Pinus massoniana, with an objective to promote comprehensive exploitation and utilization of Pinus massoniana. Twenty-one endophytic fungi strains were isolated from the roots, stalks and leaves of Pinus massoniana. Lipids of four dominant strains were extracted by acid-heating method to determine the lipid content and analyze the lipid components by GC-MS. The results showed that all of the four endophytic fungi could produce lipid. The average lipid contents were up to 20%, and the highest content 3.0.13%. The fatty acid contents of the four endophytic fungi accounted for 64% of the lipids, and the unsaturated fatty acid contents over 46%. The main components of the lipid were palmitate, stearic acid, oleic acid, linoleic acid and elaidic acid etc., with oleic acid of the highest proportion, which was up to 42.08%. Therefore, the endophytic fungi isolated from Pinus massoniana can be used for producing lipid as a new kind of microbial resource with great value of exploitation and utilization.
Hu X.,Fujian Agriculture and forestry University |
Wu C.,Fujian Agriculture and forestry University |
Wu C.,Wuyi University |
Hong W.,Fujian Agriculture and forestry University |
And 6 more authors.
Ecological Indicators | Year: 2014
Rapid human-driven conversion of global forest cover is contributing to the loss of habitat, biodiversity, and climate change. Even in a relatively short time interval and a small local region with relatively homogeneous biophysical interference, forest cover may be changed considerably by human disturbances. To better understand human influences on the pattern of forest cover change (FCC), we investigated the factors of FCC from 2007 to 2012 by combining the broad socio-economic information at the census block group level with the site-specific information measured at the pixel level. Taking the upstream area of the Minjiang River, China, as a case study, the result indicated that the major forest cover classes had a high rate of persistence in area size during the study period, while conversions among forest covers and into non-forest land occurred frequently, accounting for 5.4% of the landscape. The change of mixed forest was among the greatest one, decreasing sharply from 24.0% to 21.6% of the entire landscape, which converted predominantly into coniferous forest from 2007 to 2012. Additionally, 90.0% of the net gain to non-forest land was largely supplied by coniferous forest and mixed forest. The findings corroborate that human-driven conversions of forest covers have deleterious effects on biodiversity conservation in the upstream area of the Minjiang River. Furthermore, a binary logistic regression model was used to observe the biophysical/socio-economic drivers of FCC. We identified a FCC pattern during the period of study that was associated with collective- or enterprise-owned forests, low level of protection intensity forests, and the regions with high growth rates of fiscal revenue and far away from the city center. These results confirm that as a whole the relevant governments play an important role in the FCC in the region. This study is important for the relevant policy-makers and planners to better understand the underlying patterns and causes of this landscape change, to develop effective strategies for conserving biodiversity. © 2014 Elsevier Ltd.
Zhang G.S.,Fujian Agriculture and forestry University |
Zhang G.S.,Key Laboratory for Forest Ecosystem Process and Management of Fujian Province |
Deng H.J.,Fujian Agriculture and forestry University |
Deng H.J.,Key Laboratory for Forest Ecosystem Process and Management of Fujian Province |
And 12 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2016
To understand soil stoichiometric characteristics at different elevations in a mountainous area with high frequency debris flows, organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), total potassium (TK), and mechanical characteristics of soil from 3 elevational bands (1500-2000, 2000-2500, 2500-3000 m) were measured at different soil depths. This study also analyzed vertical variations in soil stoichiometric characteristics in these elevational gradients and its correlation with soil physical structure. SOC, TN, C:P, C:K, N:P, and N:K were positively correlated with elevation, while TP, TK, and P:K were negatively correlated with elevation. SOC had the strongest relationship with elevation, followed by total N, P, and K. The vertical distribution of SOC, TN, TP, TK, and stoichiometric ratio varied with elevation.SOC and TN decreased with soil depth, but there was no clear relationship with TP, TK, or stoichiometric ratio. Within each elevational band, soil stoichiometric characteristics did not differ significantly between forest communities and shrub-meadow communities; both presented the same pattern as the elevation changed. In the shrub-meadow community, C:N was significantly correlated with above ground vegetation cover. In the forest community, P:K was significantly correlated with mean tree height. Differences in soil physical structure were the key factor linked to changes in soil stoichiometric characteristics. C:P, C:K, N:P, and N:K had a positive exponential relationship with soil water content and sand content, and a negative exponential relationship with clay content. © 2016, Ecological Society of China. All rights reserved.
Xie H.,Fujian Agriculture and forestry University |
Gong Q.,Fujian Agriculture and forestry University |
Wu C.,Fujian Agriculture and forestry University |
Wu C.,Key Laboratory for Forest Ecosystem Process and Management of Fujian Province |
And 11 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2015
To evaluate the response mechanisms of Eucalyptus urophylla x Eucalyptus grandis and Cunninghamia lanceolata seedlings to simulated nitrogen (N) and sulfur (S) depositions, the two factors and three levels method was used for a pot experiment with Na2SO4 as sulfur source and 46% CO(NH2)2 as nitrogen source. Three levels of Na2SO4 and 46% CO(NH2)2included: low-S (0 kg hm-2 a-1), medium-S (15 kg hm-2 a-1), high-S (30 kg hm-2 a-1), and low-N (0 kg hm-2 a-1), medium-N (50 kg hm-2 a-1), high-N (100 kg hm-2 a-1), respectively. The SPAD value, soluble protein content, net photosynthetic rate (Pn) and chlorophyll fluorescence parameters in leaves of the seedlings among different treatments were measured after six months. The results showed that, compared with the control group (N: 0 kg hm-2 a-1, S: 0 kg hm-2 a-1), single medium-N deposition significantly increased Pn of seedlings of both species (P < 0.05), and single high-N deposition significantly increased the soluble protein content of C. lanceolata seedlings (P < 0.05), showing that single N deposition partly improved the photosynthetic capacity of seedlings of both species. The effects of single S deposition on photosynthetic indicators of E. urophylla x E. grandis seedlings were more obvious than on those of C. lanceolata seedlings: For E. urophylla x E. grandis seedlings, SPAD value and soluble protein content decreased but Pn increased significantly under single medium-S deposition (P < 0.05); but for C. lanceolata seedlings, only SPAD value increased significantly under single medium-S deposition and single high-S deposition (P < 0.05). Under N and S complex depositions, none of the photosynthetic characteristic factors of E. urophylla x E. grandis seedlings showed significant change (P > 0.05), and only SPAD value and soluble protein content of C. lanceolata seedlings increased significantly in the medium N-high S treatment and high N-high S treatment (P < 0.05), respectively. In conclusion, compared with single N and S deposition, the interactive effect of N and S complex depositions does not significantly promote photosynthetic characteristics of E. urophylla x E. grandis or C. lanceolata seedlings; seedlings of the two species have different responses to simulated N and S depositions. © 2015, Science Press. All rights reserved.
Aimin C.,Fujian Agriculture and forestry University |
Haojun D.,Fujian Agriculture and forestry University |
Siwei Y.,Fujian Agriculture and forestry University |
Yongming L.,Fujian Agriculture and forestry University |
And 8 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2016
Aiming to understand the effect of vegetation type on soil quality in the area of fragile ecological environment, this research studied the soil quality of different vegetation types at Jiangjia Gully, Yunnan, China in the provenance slope of the area of high-frequency debris flow. The physical and chemical properties and enzyme activities of the soil of Arachis hypogage (AH), Punica granatum (PG), Heteropogon contortus (HC), Dodonaea viscose (DV) and Leucaena leucocephala (LL) were analyzed and investigated their soil quality by the integrated soil quality index. The results showed that: (1) The soil permeability and structure stability were better in HC and DV than in LL, AH and PG; the water retention was the best in DV but inferior in LL and AH. (2) The contents of soil organic matter, total-N, and alkali-hydrolysable-N were significantly higher in DV and HC than in LL, PG and AH; the contents of available-P and available-K was the highest in PG. (3) The situation of redox was the best in HC and the worst in AH. (4) The integrated soil quality index was in the order of DV (0.68) > HC (0.60) > PG (0.56) > LL (0.45) > AH (0.33). The results indicated that DV and HC are more helpful in improving the soil quality, and it is advisable to take shrub (DV) and grass (HC) into priority consideration for vegetation restoration in the area of high-frequency debris flow. Besides, we should focus on reducing tillage and protecting the fertilizer of soil in this area.